ENGINEERED ANTI-IL-23 ANTIBODIES

FIELD OF THE INVENTION

[0001] The present invention relates generally to interleukin-23 pl9 (IL-23pl9) specific antibodies and uses thereof. More specifically, the invention relates to humanized antibodies that recognize human IL-23pl9 and modulate its activity, particularly in inflammatory, autoimmune and proliferative disorders.

BACKGROUND OF THE INVENTION

[0002] The immune system functions to protect individuals from infective agents, e.g., bacteria, multi-cellular organisms, and viruses, as well as from cancers. This system includes several types of lymphoid and myeloid cells such as monocytes, macrophages, dendritic cells (DCs), eosinophils, T cells, B cells, and neutrophils. These lymphoid and myeloid cells often produce signaling proteins known as cytokines. The immune response includes inflammation, i.e., the accumulation of immune cells systemically or in a particular location of the body. In response to an infective agent or foreign substance, immune cells secrete cytokines which, in turn, modulate immune cell proliferation, development, differentiation, or migration. Immune response can produce pathological consequences, e.g., when it involves excessive inflammation, as in the autoimmune disorders (see, e.g., Abbas, et al. (eds.) (2000) Cellular and Molecular Immunology, W.B. Saunders Co., Philadelphia, PA; Oppenheim andFeldmann (eds.) (2001) Cytokine Reference, Academic Press, San Diego, CA; von Andrian and Mackay (2000) New Engl. J. Med. 343:1020-1034; Davidson and Diamond (2001) New Engl. J. Med. 345:340-350).

[0003] Interleukin-12 (IL- 12) is a heterodimeric molecule composed of p35 and p40 subunits. Studies have indicated that IL-12 plays a critical role in the differentiation of naϊve T cells into T-helper type 1 CD4 ⁺ lymphocytes that secrete IFNγ. It has also been shown that IL-12 is essential for T cell dependent immune and inflammatory responses in

vivo. (See, e.g., Cua, et al. (2003) Nature 421 :744-748. The IL-12 receptor is composed of IL-12betal and IL-12beta2 subunits.

[0004] Interleukin-23 (IL-23) is a heterodimeric cytokine comprised of two subunits, pi 9 which is unique to IL-23, and p40, which is shared with IL-12. The pi 9 subunit is structurally related to IL-6, granulocyte-colony stimulating factor (G-CSF), and the p35 subunit of IL-12. IL-23 mediates signaling by binding to a heterodimeric receptor, comprised of IL-23R and IL-12βl, which is shared by the IL-12 receptor. A number of early studies demonstrated that the consequences of a genetic deficiency in p40 (p40 knockout mouse; p40KO mouse) were more severe than those found in a p35KO mouse. Some of these results were eventually explained by the discovery of IL-23, and the finding that the p40KO prevents expression of IL-12, but also of IL-23 (see, e.g., Oppmann, et al. (2000) Immunity 13:715-725; Wiekowski, et al. (200I) J. Immunol. 166:7563-7570; Parham, et α/.(2002) J Immunol 168:5699-708; Frucht (2002) Sd STKE 2002, E1-E3; Elkins, et al (2002) Infection Immunity 70:1936-1948).

[0005] Recent studies, through the use of p40 KO mice, have shown that blockade of both IL-23 and IL-12 is an effective treatment for various inflammatory and autoimmune disorders. However, the blockade of IL-12 through p40, appears to have various systemic consequences such as increased susceptibility to opportunistic microbial infections. [0006] The most significant limitation in using antibodies as a therapeutic agent in vivo is the immunogenicity of the antibodies. As most monoclonal antibodies are derived from rodents, repeated use in humans results in the generation of an immune response against the therapeutic antibody. Such an immune response results in a loss of therapeutic efficacy at a minimum and a potential fatal anaphylactic response at a maximum. Initial efforts to reduce the immunogenicity of rodent antibodies involved the production of chimeric antibodies, in which mouse variable regions were fused with human constant regions. Liu et al. (1987) /Vøc. Natl. Aca d. Sd. USA 84:3439-43. However, mice injected with hybrids of human variable regions and mouse constant regions develop a strong anti- antibody response directed against the human variable region, suggesting that the retention of the entire rodent Fv region in such chimeric antibodies may still result in unwanted immunogenicity in patients.

[0007] It is generally believed that complementarity determining region (CDR) loops of variable domains comprise the binding site of antibody molecules. Therefore, the

grafting of rodent CDR loops onto human frameworks (i.e., humanization) was attempted to further minimize rodent sequences. Jones et al. (1986) Nature 321 :522; Verhoeyen et al. (1988) Science 239:1534. However, CDR loop exchanges still do not uniformly result in an antibody with the same binding properties as the antibody of origin. Changes in framework residues (FR), residues involved in CDR loop support, in humanized antibodies also are required to preserve antigen binding affinity. Kabat et al. (1991) J. Immunol. 147:1709. While the use of CDR grafting and framework residue preservation in a number of humanized antibody constructs has been reported, it is difficult to predict if a particular sequence will result in the antibody with the desired binding, and sometimes biological, properties. See, e.g., Queen et al. (1989) Proc. Natl. Acad. Sd. USA 86:10029, Gorman et al. (1991) Proc. Natl. Acad. Sd. USA 88:4181, and Hodgson (1991) Biotechnology (NY) 9:421-5. Moreover, most prior studies used different human sequences for animal light and heavy variable sequences, rendering the predictive nature of such studies questionable. Sequences of known antibodies have been used or, more typically, those of antibodies having known X-ray structures, antibodies NEW and KOL. See, e.g., Jones et al., supra; Verhoeyen et al., supra; and Gorman et al., supra. Exact sequence information has been reported for a few humanized constructs. The present invention provides engineered IL- 23pl9 antibodies and uses thereof to treat inflammatory, autoimmune, and proliferative disorders.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figures IA - 1C show comparisons of mouse anti-human IL-23pl9 antibody clone heavy chain variable domain sequences. CDRs are indicated, as are CDR consensus sequences, for clones 7G10, 6H12, 13F11, 13B5, 7E2, 13Gl, HClO, IElO, 30F11, 34E4, 5B12, 6H4, 9C9, HBlO, 30El, 33D2, 20A9, 22E9, 29D5, 21 AlO, 33B12, 10H11, 19E9, 10G8, 3D7, 39G2, 35F12, 49A10, 34F9, and 7D7.

[0009] Figures 2A - 2C show comparisons of mouse anti-human IL-23pl9 antibody clone light chain variable domain sequences. CDRs are indicated for clones 7G10, 6Hl 2, 13Fl 1, 13B5, 7E2, 13Gl, HClO, IElO, 30Fl 1, 34E4, 5B12, 6H4, 9C9, HBlO, 33D2, 20A9, 22E9, 29D5, 21Al 0, 33B12, 10H11, 19E9, 10G8, 3D7, 39G2, 35F12, 49A10, 34F9, and 7D7. No light chain variable domain sequence is provided for clone 30El . Consensus

sequences are provided for each of three subfamilies of light chain CDR sequences, referred to herein as light chain subfamilies (a), (b) and (c). These sequence subfamilies are displayed from top to bottom in FIGS. 2 A - 2C.

SUMMARY OF THE INVENTION

[0010] The present invention is based on the observation that blockade of IL-23 inhibits inflammation, autoimmunity, and abnormal proliferation.

[0011] The present invention encompasses a binding compound, such as an antibody or fragment thereof, including humanized or chimeric recombinant antibodies, that binds human IL-23pl9, comprising at least one antibody light chain variable region, or binding fragment thereof, having at least one, two or three CDRs selected from the group consisting of SEQ ID NOs: 81-89. hi one embodiment, the binding compound of the present invention comprises a light chain variable domain comprising at least one CDRLl selected from the group consisting of SEQ ID NOs: 81-83 and at least one CDRL2 selected from the group consisting of SEQ ID NOs: 84-86 and at least one CDRL3 selected from the group consisting of SEQ ID NOs: 87-89.

[0012] hi one embodiment, the binding compound comprises at least one antibody heavy chain variable region, or binding fragment thereof, having at least one, two or three CDRs selected from the group consisting of SEQ ID NOs: 78-80.

[0013] hi some embodiments, the binding compound comprises a framework region, wherein the amino acid sequence of framework region is all or substantially all of a human immunoglobin amino acid sequence.

[0014] hi another embodiment, the binding compound of the present invention comprises at least one, two or three light chain CDRs having the sequence of SEQ ID NOs: 81-89 or optionally a variant thereof, hi one embodiment, the binding compound comprises at least one, two or three heavy chain CDRs having the sequence of SEQ ID NOs: 78-80 or optionally a variant thereof, hi various embodiments the variant comprises up to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more conservatively modified amino acid residues relative to the sequence of the respective SEQ ID NOs. Conservative amino acid substitutions are provided at Table 1.

[0015] In other embodiments, the binding compound comprises at least one antibody light chain variable region, or binding fragment thereof, having at least one, two or three

CDRs selected from the group consisting of SEQ ID NOs: 69-77. In one embodiment, the binding compound of the present invention comprises a light chain variable domain comprising at least one CDRLl selected from the group consisting of SEQ ID NOs: 69-71 and at least one CDRL2 selected from the group consisting of SEQ ID NOs: 72-74 and at least one CDRL3 selected from the group consisting of SEQ ID NOs: 75-77. hi one embodiment, the binding compound comprises at least one antibody heavy chain variable region, or binding fragment thereof, having at least one, two or three CDRs selected from the group consisting of SEQ ID NOs: 66-68.

[0016] hi other embodiments, the binding compound of the present invention comprises at least one, two or three light chain CDRs having the sequence of SEQ ID NOs: 69-77 or a variant thereof. In another embodiment, the binding compound of the present invention comprises a light chain variable domain comprising at least one CDRLl selected from the group consisting of SEQ ID NOs: 69-71 or a variant thereof, and at least one CDRL2 selected from the group consisting of SEQ ID NOs: 72-74 or a variant thereof, and at least one CDRL3 selected from the group consisting of SEQ ID NOs: 75-77 or a variant thereof. In one embodiment, the binding compound of the present invention comprises at least one, two or three heavy chain CDRs having the sequence of SEQ ID NOs: 66-68 or a variant thereof, hi various embodiments the variant comprises up to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more conservatively modified amino acid residues relative to the sequence of the respective SEQ ID NOs.

[0017] hi yet another embodiment, the binding compound of the present invention comprises at least one, two or three light chain CDRs selected from the group consisting of residues 43-53, 69-75 and 108-116 of SEQ ID NOs: 2 and 4, and at least one, two or three heavy chain CDRs selected from the group consisting of residues 45-54, 69-85 and 118-123 of SEQ ID NOs: l and 3.

[0018] hi one embodiment, the binding compound comprises an antibody light chain variable domain having the sequence of the residues 20-129 of SEQ ID NO: 2 or 4 or a variant thereof, hi one embodiment, the binding compound comprises an antibody heavy chain variable domain having the sequence of residues 20-134 of SEQ ID NO: 1 or 3 or a variant thereof, hi various embodiments the variant comprises up to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40 or 50 or more conservatively modified amino acid residues relative to the sequence of the respective SEQ ID NOs.

[0019] In one embodiment, the binding compound comprises an antibody light chain comprising, or consisting essentially of, the sequence of the mature form (residues 20-233) of SEQ ID NO: 2 or 4. In one embodiment, the binding compound comprises an antibody heavy chain comprising, or consisting essentially of, the sequence of the mature form (residues 20-464) of SEQ ID NO: 1 or 3.

[0020] In one embodiment, the binding compound of the present invention binds to human IL-23pl9 (SEQ ID NO: 29) at an epitope comprising residues 82-95, or residues 133-140, or both. In another embodiment the IL-23pl9 binding compound binds to an epitope comprising some or all of residues E82, G86, S87, D88, T91, G92, E93, P94, S95, H106, P133, S134, Q135, P136, W137, R139 and L140, and optionally residues K83, F90 and Ll 10. In various embodiments the epitope for an antibody of interest is determined by obtaining an X-ray crystal structure of an antibody: antigen complex and determining which residues on IL-23pl9 are within a specified distance of residues on the antibody of interest, wherein the specified distance is, e.g., 4A or 5A. In some embodiments, the epitope is defined as a stretch of 8 or more contiguous amino acid residues along the IL-23pl9 sequence in which at least 50%, 70% or 85% of the residues are within the specified distance of the antibody.

[0021] In other embodiments, the present invention provides a binding compound that binds to human IL-23 and has a light chain variable domain (VL) with at least 95%, 90%. 85%, 80%, 75% or 50% sequence homology with the residues 20-129 of SEQ ID NO: 2 or 4. In one embodiment, the present invention provides a binding compound that binds to human IL-23 and has a heavy chain variable domain (V _H ) with at least 95%, 90%. 85%, 80%, 75% or 50% sequence homology with residues 20-134 of SEQ ID NO: 1 or 3. [0022] Ih one embodiment, the binding compound comprises, or consists essentially of, an antibody having a light chain having the sequence of the mature form (i.e. residues 20-233) of SEQ ID NO: 2 or 4. In one embodiment, the binding compound comprises, or consists essentially of, an antibody having a heavy chain having the sequence of the mature form (i.e. residues 20-464) of SEQ ID NO: 1 or 3.

[0023] In one embodiment, the invention relates to antibodies that are able to block the binding of a binding compound of the present invention to human IL-23 in a cross- blocking assay. In another embodiment, the invention relates to binding compounds that

are able to block IL-23-mediated activity, such activities including but not limited to, binding to its receptor or promoting the proliferation or survival of T _H 17 cells. [0024] In some embodiments, the binding compound of the present invention further comprises a heavy chain constant region, wherein the heavy chain constant region comprises a γl , γ2, γ3, or γ4 human heavy chain constant region or a variant thereof. In various embodiments the light chain constant region comprises a lambda or a kappa human light chain constant region.

[0025] In various embodiments the binding compounds of the present invention are polyclonal, monoclonal, chimeric, humanized or fully human antibodies or fragments thereof. The present invention also contemplates that the binding fragment is an antibody fragment selected from the group consisting of Fab, Fab', Fab'-SH, Fv, scFv, F(ab') ₂ , and a diabody.

[0026] The present invention encompasses a method of suppressing an immune response in a human subject comprising administering to a subject in need thereof an antibody (or a binding fragment thereof) specific for IL-23 in an amount effective to block the biological activity of IL-23. In some embodiments, the antibody specific for IL-23 is the humanized or chimeric antibody, hi further embodiments, the immune response is an inflammatory response including arthritis, psoriasis, and inflammatory bowel disease, hi other embodiments, the immune response is an autoimmune response, including multiple sclerosis, uveitis, systemic lupus erythematosus and diabetes, hi another embodiment, the immune response is to cancer.

[0027] The present invention also contemplates administering an additional immunosuppressive or anti-inflammatory agent. The binding compounds of the present invention can be in a composition comprising the binding compound, or binding fragment thereof, in combination with a pharmaceutically acceptable carrier or diluent, hi a further embodiment, the composition further comprises an immunosuppressive or anti- inflammatory agent.

[0028] The present invention encompasses an isolated nucleic acid encoding the polypeptide sequence of an antibody embodiment of the binding compound of the present invention. The nucleic acid can be in an expression vector operably linked to control sequences recognized by a host cell transfected with the vector. Also encompassed is a host cell comprising the vector, and a method of producing a polypeptide comprising culturing

the host cell under conditions wherein the nucleic acid sequence is expressed, thereby producing the polypeptide, and recovering the polypeptide from the host cell or medium. [0029] hi various embodiments, the invention relates to medicaments comprising the binding compounds of the present invention.

DETAILED DESCRIPTION

[0030] As used herein, including the appended claims, the singular forms of words such as "a," "an," and "the," include their corresponding plural references unless the context clearly dictates otherwise. Table 7 below provides a listing of sequence identifiers used in this application. All references cited herein are incorporated by reference to the same extent as if each individual publication, patent application, or patent, was specifically and individually indicated to be incorporated by reference.

I. Definitions

[0031] "Activation," "stimulation," and "treatment," as it applies to cells or to receptors, may have the same meaning, e.g., activation, stimulation, or treatment of a cell or receptor with a ligand, unless indicated otherwise by the context or explicitly. "Ligand" encompasses natural and synthetic ligands, e.g., cytokines, cytokine variants, analogues, muteins, and binding compositions derived from antibodies. "Ligand" also encompasses small molecules, e.g., peptide mimetics of cytokines and peptide mimetics of antibodies. "Activation" can refer to cell activation as regulated by internal mechanisms as well as by external or environmental factors. "Response," e.g., of a cell, tissue, organ, or organism, encompasses a change in biochemical or physiological behavior, e.g., concentration, density, adhesion, or migration within a biological compartment, rate of gene expression, or state of differentiation, where the change is correlated with activation, stimulation, or treatment, or with internal mechanisms such as genetic programming.

[0032] "Activity" of a molecule may describe or refer to the binding of the molecule to a ligand or to a receptor, to catalytic activity; to the ability to stimulate gene expression or cell signaling, differentiation, or maturation; to antigenic activity, to the modulation of activities of other molecules, and the like. "Activity" of a molecule may also refer to

activity in modulating or maintaining cell-to-cell interactions, e.g., adhesion, or activity in maintaining a structure of a cell, e.g., cell membranes or cytoskeleton. "Activity" can also mean specific activity, e.g., [catalytic activity]/[mg protein], or [immunological activity]/[mg protein], concentration in a biological compartment, or the like. "Proliferative activity" encompasses an activity that promotes, that is necessary for, or that is specifically associated with, e.g., normal cell division, as well as cancer, tumors, dysplasia, cell transformation, metastasis, and angiogenesis.

[0033] "Administration" and "treatment," as it applies to an animal, human, experimental subject, cell, tissue, organ, or biological fluid, refers to contact of an exogenous pharmaceutical, therapeutic, diagnostic agent, or composition to the animal, human, subject, cell, tissue, organ, or biological fluid. "Administration" and "treatment" can refer, e.g., to therapeutic, pharmacokinetic, diagnostic, research, and experimental methods. Treatment of a cell encompasses contact of a reagent to the cell, as well as contact of a reagent to a fluid, where the fluid is in contact with the cell. "Administration" and "treatment" also means in vitro and ex vivo treatments, e.g., of a cell, by a reagent, diagnostic, binding composition, or by another cell. "Treatment," as it applies to a human, veterinary, or research subject, refers to therapeutic treatment, prophylactic or preventative measures, to research and diagnostic applications. "Treatment" as it applies to a human, veterinary, or research subject, or cell, tissue, or organ, encompasses contact of an IL-23 agonist or IL-23 antagonist to a human or animal subject, a cell, tissue, physiological compartment, or physiological fluid. "Treatment of a cell" also encompasses situations where the IL-23 agonist or IL-23 antagonist contacts IL-23 receptor (IL-23R/IL-12Rbetal heterodimer), e.g., in the fluid phase or colloidal phase, but also situations where the agonist or antagonist does not contact the cell or the receptor.

[0034] As used herein, the term "antibody" refers to any form of antibody or fragment thereof that exhibits the desired biological activity. Thus, it is used in the broadest sense and specifically covers monoclonal antibodies (including full length monoclonal antibodies), polyclonal antibodies, multispecific antibodies {e.g., bispecific antibodies), and antibody fragments so long as they exhibit the desired biological activity. [0035] As used herein, the term "IL-23pl 9 binding fragment" or "binding fragment thereof encompasses a fragment or a derivative of an antibody that still substantially retain its biological activity of inhibiting IL-23pl9 activity. Therefore, the term "antibody

fragment" or IL-23pl9 binding fragment refers to a portion of a full length antibody, generally the antigen binding or variable region thereof. Examples of antibody fragments include Fab, Fab', F(ab') ₂ , and Fv fragments; diabodies; linear antibodies; single-chain antibody molecules, e.g., sc-Fv; and multispecifϊc antibodies formed from antibody fragments. Typically, a binding fragment or derivative retains at least 10% of its IL-23pl9 inhibitory activity. Preferably, a binding fragment or derivative retains at least 25%, 50%, 60%, 70%, 80%, 90%, 95%, 99% or 100% (or more) of its IL-23ρl9 inhibitory activity, although any binding fragment with sufficient affinity to exert the desired biological effect will be useful. It is also intended that a IL-23pl9 binding fragment can include conservative amino acid substitutions that do not substantially alter its biologic activity. [0036] The term "monoclonal antibody", as used herein, refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic epitope. Ia contrast, conventional (polyclonal) antibody preparations typically include a multitude of antibodies directed against (or specific for) different epitopes. The modifier "monoclonal" indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method. For example, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler et al., (1975) Nature 256: 495, or maybe made by recombinant DNA methods {see, e.g., U.S. Pat. No. 4,816,567). The "monoclonal antibodies" may also be isolated from phage antibody libraries using the techniques described in Clackson et al., (1991) Nature 352: 624-628 and Marks et al., (1991) J. MoI. Biol. 222: 581-597, for example.

[0037] The monoclonal antibodies herein specifically include "chimeric" antibodies

(immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of

such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; and Morrison et al, (1984) Proc. Natl. Acad ScL USA 81: 6851-6855). [0038] A "domain antibody" is an immunologically functional immunoglobulin fragment containing only the variable region of a heavy chain or the variable region of a light chain. In some instances, two or more VH regions are covalently joined with a peptide linker to create a bivalent domain antibody. The two V _H regions of a bivalent domain antibody may target the same or different antigens.

[0039] A "bivalent antibody" comprises two antigen binding sites, hi some instances, the two binding sites have the same antigen specificities. However, bivalent antibodies may be bispecific (see below).

[0040] As used herein, the term "single-chain Fv" or "scFv" antibody refers to antibody fragments comprising the V _H and V _L domains of antibody, wherein these domains are present in a single polypeptide chain. Generally, the Fv polypeptide further comprises a polypeptide linker between the V _H and V _L domains which enables the sFv to form the desired structure for antigen binding. For a review of sFv, see Pluckthun (1994) THE PHARMACOLOGY OF MONOCLONAL ANTIBODIES, vol. 113, Rosenburg and Moore eds. Springer- Verlag, New York, pp. 269-315.

[0041] The monoclonal antibodies herein also include camelized single domain antibodies. See, e.g., Muyldermans et al. (2001) Trends Biochem. Sd. 26:230; Reichmann et al. (1999) J. Immunol. Methods 231:25; WO 94/04678; WO 94/25591; U.S. Pat. No. 6,005,079, which are hereby incorporated by reference in their entireties), hi one embodiment, the present invention provides single domain antibodies comprising two V _H domains with modifications such that single domain antibodies are formed. [0042] As used herein, the term "diabodies" refers to small antibody fragments with two antigen-binding sites, which fragments comprise a heavy chain variable domain (V _H ) connected to a light chain variable domain (V _L ) in the same polypeptide chain (V _H -VL or V _L -V _H )- By using a linker that is too short to allow pairing between the two domains on the same chain, the domains are forced to pair with the complementary domains of another chain and create two antigen-binding sites. Diabodies are described more fully in, e.g., EP 404,097; WO 93/11161; and Holliger et al. (1993) Proc. Natl. Acad. ScL USA 90: 6444- 6448. For a review of engineered antibody variants generally see Holliger and Hudson (2005) Nat. Biotechnol. 23:1126-1136.

[0043] As used herein, the term "humanized antibody" refers to forms of antibodies that contain sequences from non-human (e.g., murine) antibodies as well as human antibodies. Such antibodies contain minimal sequence derived from non-human immunoglobulin. Ia general, the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FR regions are those of a human immunoglobulin sequence. The humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin. The prefix "hum" is added to antibody clone designations when necessary to distinguish humanized antibodies (e.g. hum6H12) from parental rodent antibodies (e.g. mouse 6H12, or "m6H12"). The humanized forms of rodent antibodies will generally comprise the same CDR sequences of the parental rodent antibodies, although certain amino acid substitutions may be included to increase affinity or increase stability of the humanized antibody.

[0044] The antibodies of the present invention also include antibodies with modified

(or blocked) Fc regions to provide altered effector functions. See, e.g., U.S. Pat. No. 5,624,821; WO2003/086310; WO2005/120571; WO2006/0057702; Presta (2006) Adv. Drug Delivery Rev. 58:640-656. Such modification can be used to enhance or suppress various reactions of the immune system, with possible beneficial effects in diagnosis and therapy. Alterations of the Fc region include amino acid changes (substitutions, deletions and insertions), glycosylation or deglycosylation, and adding multiple Fc. Changes to the Fc can also alter the half-life of antibodies in therapeutic antibodies, and a longer half-life would result in less frequent dosing, with the concomitant increased convenience and decreased use of material. See Presta (2005) J. Allergy Clin. ImmunoL116:731 at 734-35. [0045] The term "fully human antibody" refers to an antibody that comprises human immunoglobulin protein sequences only. A fully human antibody may contain murine carbohydrate chains if produced in a mouse, in a mouse cell, or in a hybridoma derived from a mouse cell. Similarly, "mouse antibody" refers to an antibody which comprises mouse immunoglobulin sequences only.

[0046] As used herein, the term "hypervariable region" refers to the amino acid residues of an antibody that are responsible for antigen-binding. The hypervariable region comprises amino acid residues from a "complementarity determining region" or "CDR" (e.g.

residues 24-34 (CDRLl), 50-56 (CDRL2) and 89-97 (CDRL3) in the light chain variable domain and residues 31-35 (CDRHl) ₃ 50-65 (CDRH2) and 95-102 (CDRH3) in the heavy chain variable domain; Kabat et al., (1991) Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md.) and/or those residues from a "hypervariable loop" (i.e. residues 26-32 (Ll), 50-52 (L2) and 91-96 (L3) in the light chain variable domain and 26-32 (Hl), 53-55 (H2) and 96-101 (H3) in the heavy chain variable domain; Chothia and Lesk, (1987) J. MoI. Biol. 196: 901-917). As used herein, the term "framework" or "FR" residues refers to those variable domain residues other than the hypervariable region residues defined herein as CDR residues. The residue numbering above relates to the Kabat numbering system and does not necessarily correspond in detail to the sequence numbering in the accompanying Sequence Listing. See Tables 2 and 3, in which sequence numbering is with reference to the Sequence Listing. [0047] "Binding compound" refers to a molecule, small molecule, macromolecule, polypeptide, antibody or fragment or analogue thereof, or soluble receptor, capable of binding to a target. "Binding compound" also may refer to a complex of molecules, e.g., a non-covalent complex, to an ionized molecule, and to a covalently or non-covalently modified molecule, e.g., modified by phosphorylation, acylation, cross-linking, cyclization, or limited cleavage, which is capable of binding to a target. When used with reference to antibodies, the term "binding compound" refers to both antibodies and binding fragments thereof. "Binding" refers to an association of the binding composition with a target where the association results in reduction in the normal Brownian motion of the binding composition, in cases where the binding composition can be dissolved or suspended in solution. "Binding composition" refers to a molecule, e.g. a binding compound, in combination with a stabilizer, excipient, salt, buffer, solvent, or additive, capable of binding to a target.

[0048] "Conservatively modified variants" or "conservative substitution" refers to substitutions of amino acids are known to those of skill in this art and may be made generally without altering the biological activity of the resulting molecule. Those of skill in this art recognize that, in general, single amino acid substitutions in non-essential regions of a polypeptide do not substantially alter biological activity (see, e.g., Watson, et al., Molecular Biology of the Gene, The Benjamin/Cummings Pub. Co., p. 224 (4th Edition

1987)). Such exemplary substitutions are preferably made in accordance with those set forth in Table 1 as follows:

Table 1 Exem lar Conservative Amino Acid Substitutions

[0049] The terms "consists essentially of," or variations such as "consist essentially of or "consisting essentially of," as used throughout the specification and claims, indicate the inclusion of any recited elements or group of elements, and the optional inclusion of other elements, of similar or different nature than the recited elements, that do not materially change the basic or novel properties of the specified dosage regimen, method, or composition. As a nonlimiting example, a binding compound that consists essentially of a recited amino acid sequence may also include one or more amino acids, including

substitutions of one or more amino acid residues, that do not materially affect the properties of the binding compound.

[0050] "Effective amount" encompasses an amount sufficient to ameliorate or prevent a symptom or sign of the medical condition. Effective amount also means an amount sufficient to allow or facilitate diagnosis. An effective amount for a particular patient or veterinary subject may vary depending on factors such as the condition being treated, the overall health of the patient, the method route and dose of administration and the severity of side affects (see, e.g., U.S. Pat. No. 5,888,530 issued to Netti, et al.). An effective amount can be the maximal dose or dosing protocol that avoids significant side effects or toxic effects. The effect will result in an improvement of a diagnostic measure or parameter by at least 5%, usually by at least 10%, more usually at least 20%, most usually at least 30%, preferably at least 40%, more preferably at least 50%, most preferably at least 60%, ideally at least 70%, more ideally at least 80%, and most ideally at least 90%, where 100% is defined as the diagnostic parameter shown by a normal subject (see, e.g., Maynard, et al. (1996) A Handbook of SOPs for Good Clinical Practice, Interpharm Press, Boca Raton, FL; Dent (2001) Good Laboratory and Good Clinical Practice, Urch Publ., London, UK).

[0051] "Exogenous" refers to substances that are produced outside an organism, cell, or human body, depending on the context. "Endogenous" refers to substances that are produced within a cell, organism, or human body, depending on the context. [0052] "Immune condition" or "immune disorder" encompasses, e.g., pathological inflammation, an inflammatory disorder, and an autoimmune disorder or disease. "Immune condition" also refers to infections, persistent infections, and proliferative conditions, such as cancer, tumors, and angiogenesis, including infections, tumors, and cancers that resist eradication by the immune system. "Cancerous condition" includes, e.g., cancer, cancer cells, tumors, angiogenesis, and precancerous conditions such as dysplasia. [0053] "Inflammatory disorder" means a disorder or pathological condition where the pathology results, in whole or in part, from, e.g., a change in number, change in rate of migration, or change in activation, of cells of the immune system. Cells of the immune system include, e.g., T cells, B cells, monocytes or macrophages, antigen presenting cells (APCs), dendritic cells, microglia, NK cells, NKT cells, neutrophils, eosinophils, mast cells,

or any other cell specifically associated with the immunology, for example, cytokine- producing endothelial or epithelial cells.

[0054] An "IL-17-producing cell" means a T cell that is not a classical THl -type

T cell or classical TH2-type T cell, referred to as T _H I 7 cells. THI 7 cells are discussed in greater detail at Cua and Kastelein (2006) Nat. Immunol. 7:557-559; Tato and O'Shea (2006) Nature 441:166-168; Iwakura and Ishigame (2006) J. Clin. Invest. 116:1218-1222, the disclosures of which are hereby incorporated by reference in their entireties. "IL- 17- producing cell" also means a T cell that expresses a gene or polypeptide of Table 1OB of U.S. Patent Application Publication No. 2004/0219150 (e.g., mitogen responsive P-protein; chemokine ligand 2; interleukin-17 (IL-17); transcription factor RAR related; and/or suppressor of cytokine signaling 3), the disclosure of which is hereby incorporated by reference in its entirety, where expression with treatment by an IL-23 agonist is greater than treatment with an IL- 12 agonist, where "greater than" is defined as follows. Expression with an IL-23 agonist is ordinarily at least 5-fold greater, typically at least 10-fold greater, more typically at least 15-fold greater, most typically at least 20-fold greater, preferably at least 25-fold greater, and most preferably at least 30-fold greater, than with IL-12 treatment. Expression can be measured, e.g., with treatment of a population of substantially pure IL-17 producing cells.

[0055] Moreover, "IL-17-producing cell" includes a progenitor or precursor cell that is committed, in a pathway of cell development or cell differentiation, to differentiating into an IL-17-producing cell, as defined above. A progenitor or precursor cell to the IL-17 producing cell can be found in a draining lymph node (DLN). Additionally, "IL-17- producing cell" encompasses an IL-17-producing cell, as defined above, that has been, e.g., activated, e.g., by a phorbol ester, ionophore, and/or carcinogen, further differentiated, stored, frozen, desiccated, inactivated, partially degraded, e.g., by apoptosis, proteolysis, or lipid oxidation, or modified, e.g., by recombinant technology.

[0056] As used herein, the term "isolated nucleic acid molecule" refers to a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the natural source of the antibody nucleic acid. An isolated nucleic acid molecule is other than in the form or setting in which it is found in nature. Isolated nucleic acid molecules therefore are distinguished from the nucleic acid molecule as it exists in natural cells. However, an isolated nucleic acid molecule

includes a nucleic acid molecule contained in cells that ordinarily express the antibody where, for example, the nucleic acid molecule is in a chromosomal location different from that of natural cells.

[0057] The expression "control sequences" refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism. The control sequences that are suitable for prokaryotes, for example, include a promoter, optionally an operator sequence, and a ribosome binding site. Eukaryotic cells are known to utilize promoters, polyadenylation signals, and enhancers.

[0058] A nucleic acid is "operably linked" when it is placed into a functional relationship with another nucleic acid sequence. For example, DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion of the polypeptide; a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence; or a ribosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation. Generally, "operably linked" means that the DNA sequences being linked are contiguous, and, in the case of a secretory leader, contiguous and in reading phase. However, enhancers do not have to be contiguous. Linking is accomplished by ligation at convenient restriction sites. If such sites do not exist, the synthetic oligonucleotide adaptors or linkers are used in accordance with conventional practice. [0059] As used herein, the expressions "cell," "cell line," and "cell culture" are used interchangeably and all such designations include progeny. Thus, the words "transformants" and "transformed cells" include the primary subject cell and cultures derived therefrom without regard for the number of transfers. It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations. Mutant progeny that have the same function or biological activity as screened for in the originally transformed cell are included. Where distinct designations are intended, it will be clear from the context.

[0060] As used herein, "polymerase chain reaction" or "PCR" refers to a procedure or technique in which minute amounts of a specific piece of nucleic acid, RNA and/or DNA, are amplified as described in, e.g., U.S. Pat. No. 4,683,195. Generally, sequence information from the ends of the region of interest or beyond needs to be available, such that oligonucleotide primers can be designed; these primers will be identical or similar in

sequence to opposite strands of the template to be amplified. The 5' terminal nucleotides of the two primers can coincide with the ends of the amplified material. PCR can be used to amplify specific RNA sequences, specific DNA sequences from total genomic DNA, and cDNA transcribed from total cellular RNA, bacteriophage or plasmid sequences, etc. See generally Mullis et al. (1987) Cold Spring Harbor Symp. Quant. Biol. 51:263; Erlich, ed., (1989) PCR TECHNOLOGY (Stockton Press, N. Y.) As used herein, PCR is considered to be one, but not the only, example of a nucleic acid polymerase reaction method for amplifying a nucleic acid test sample comprising the use of a known nucleic acid as a primer and a nucleic acid polymerase to amplify or generate a specific piece of nucleic acid. [0061] As used herein, the term "germline sequence" refers to a sequence of unrearranged immunoglobulin DNA sequences. Any suitable source of unrearranged irnmunoglobulin DNA may be used.

[0062] "Inhibitors" and "antagonists" or "activators" and "agonists" refer to inhibitory or activating molecules, respectively, e.g., for the activation of, e.g., a ligand, receptor, cofactor, a gene, cell, tissue, or organ. A modulator of, e.g., a gene, a receptor, a ligand, or a cell, is a molecule that alters an activity of the gene, receptor, ligand, or cell, where activity can be activated, inhibited, or altered in its regulatory properties. The modulator may act alone, or it may use a cofactor, e.g., a protein, metal ion, or small molecule. Inhibitors are compounds that decrease, block, prevent, delay activation, inactivate, desensitize, or down regulate, e.g., a gene, protein, ligand, receptor, or cell. Activators are compounds that increase, activate, facilitate, enhance activation, sensitize, or up regulate, e.g., a gene, protein, ligand, receptor, or cell. An inhibitor may also be defined as a composition that reduces, blocks, or inactivates a constitutive activity. An "agonist" is a compound that interacts with a target to cause or promote an increase in the activation of the target. An "antagonist" is a compound that opposes the actions of an agonist. An antagonist prevents, reduces, inhibits, or neutralizes the activity of an agonist. An antagonist can also prevent, inhibit, or reduce constitutive activity of a target, e.g., a target receptor, even where there is no identified agonist.

[0063] To examine the extent of inhibition, for example, samples or assays comprising a given, e.g., protein, gene, cell, or organism, are treated with a potential activating or inhibiting agent and are compared to control samples without the agent. Control samples, i.e., not treated with agent, are assigned a relative activity value of 100%.

Inhibition is achieved when the activity value relative to the control is about 90% or less, typically 85% or less, more typically 80% or less, most typically 75% or less, generally 70% or less, more generally 65% or less, most generally 60% or less, typically 55% or less, usually 50% or less, more usually 45% or less, most usually 40% or less, preferably 35% or less, more preferably 30% or less, still more preferably 25% or less, and most preferably less than 25%. Activation is achieved when the activity value relative to the control is about 110%, generally at least 120%, more generally at least 140%, more generally at least 160%, often at least 180%, more often at least 2-fold, most often at least 2.5-fold, usually at least 5- fold, more usually at least 10-fold, preferably at least 20-fold, more preferably at least 40- fold, and most preferably over 40-fold higher.

[0064] Endpoints in activation or inhibition can be monitored as follows.

Activation, inhibition, and response to treatment, e.g., of a cell, physiological fluid, tissue, organ, and animal or human subject, can be monitored by an endpoint. The endpoint may comprise a predetermined quantity or percentage of, e.g., an indicia of inflammation, oncogenicity, or cell degranulation or secretion, such as the release of a cytokine, toxic oxygen, or a protease. The endpoint may comprise, e.g., a predetermined quantity of ion flux or transport; cell migration; cell adhesion; cell proliferation; potential for metastasis; cell differentiation; and change in phenotype, e.g., change in expression of gene relating to inflammation, apoptosis, transformation, cell cycle, or metastasis (see, e.g., Knight (2000) Ann. CHn. Lab. ScL 30:145-158; Hood and Cheresh (2002) Nature Rev. Cancer 2:91-100; Timme, et a (2003) Curt: Drug Targets 4:251-261; Robbins and Itzkowitz (2002) Med. Clin. North Am. 86:1467-1495; Grady and Markowitz (2002) Annu. Rev. Genomics Hum. Genet. 3:101-128; Bauer, et al. (2001) GHa 36:235-243; Stanimirovic and Satoh (2000) Brain Pathol. 10:113-126).

[0065] An endpoint of inhibition is generally 75% of the control or less, preferably

50% of the control or less, more preferably 25% of the control or less, and most preferably 10% of the control or less. Generally, an endpoint of activation is at least 150% the control, preferably at least two times the control, more preferably at least four times the control, and most preferably at least 10 times the control.

[0066] "Ligand" refers, e.g., to a small molecule, peptide, polypeptide, and membrane associated or membrane-bound molecule, or complex thereof, that can act as an agonist or antagonist of a receptor. "Ligand" also encompasses an agent that is not an

agonist or antagonist, but that can bind to the receptor. Moreover, "ligand" includes a membrane-bound ligand that has been changed, e.g., by chemical or recombinant methods, to a soluble version of the membrane-bound ligand. By convention, where a ligand is membrane-bound on a first cell, the receptor usually occurs on a second cell. The second cell may have the same or a different identity as the first cell. A ligand or receptor may be entirely intracellular, that is, it may reside in the cytosol, nucleus, or some other intracellular compartment. The ligand or receptor may change its location, e.g., from an intracellular compartment to the outer face of the plasma membrane. The complex of a ligand and receptor is termed a "ligand receptor complex." Where a ligand and receptor are involved in a signaling pathway, the ligand occurs at an upstream position and the receptor occurs at a downstream position of the signaling pathway.

[0067] "Small molecules" are provided for the treatment of physiology and disorders of the hair follicle. "Small molecule" is defined as a molecule with a molecular weight that is less than 10 kD, typically less than 2 kD, and preferably less than 1 kD. Small molecules include, but are not limited to, inorganic molecules, organic molecules, organic molecules containing an inorganic component, molecules comprising a radioactive atom, synthetic molecules, peptide mimetics, and antibody mimetics. As a therapeutic, a small molecule may be more permeable to cells, less susceptible to degradation, and less apt to elicit an immune response than large molecules. Small molecules, such as peptide mimetics of antibodies and cytokines, as well as small molecule toxins are described (see, e.g., Casset, et al. (2003) Biochem, Biophys. Res. Commun. 307:198-205; Muyldermans (200I) J. Biotechnol. 74:277-302; Li (2000) Nat. Biotechnol. 18:1251-1256; Apostolopoulos, et al. (2002) Curr. Med. Chem. 9:411-420; Monfardini, et al. (2002) Curr. Pharm. Des. 8:2185- 2199; Domingues, et al. (1999) Nat. Struct. Biol. 6:652-656; Sato and Sone (2003) Biochem. J. 371:603-608; U.S. Patent No. 6,326,482 issued to Stewart, et al). [0068] "Specifically" or "selectively" binds, when referring to a ligand/receptor, antibody/antigen, or other binding pair, indicates a binding reaction which is determinative of the presence of the protein in a heterogeneous population of proteins and other biologies. Thus, under designated conditions, a specified ligand binds to a particular receptor and does not bind in a significant amount to other proteins present in the sample. [0069] The antibody, or binding composition derived from the antigen-binding site of an antibody, of the contemplated method binds to its antigen with an affinity that is at

least two fold greater, preferably at least ten times greater, more preferably at least 20-times greater, and most preferably at least 100-times greater than the affinity with unrelated antigens. In a preferred embodiment the antibody will have an affinity that is greater than about 10 ⁹ liters/mol, as determined, e.g., by Scatchard analysis (Munsen, et al. (1980) Analyt. Biochem. 107:220-239).

[0070] As used herein, the term "immunomodulatory agent" refers to natural or synthetic agents that suppress or modulate an immune response. The immune response can be a humoral or cellular response. Immunomodulatory agents encompass immunosuppressive or anti-inflammatory agents.

[0071] "Immunosuppressive agents," "immunosuppressive drugs," or

"immunosuppressants" as used herein are therapeutics that are used in immunosuppressive therapy to inhibit or prevent activity of the immune system. Clinically they are used to prevent the rejection of transplanted organs and tissues (e.g. bone marrow, heart, kidney, liver), and/or in the treatment of autoimmune diseases or diseases that are most likely of autoimmune origin (e.g. rheumatoid arthritis, myasthenia gravis, systemic lupus erythematosus, ulcerative colitis, multiple sclerosis). Immunosuppressive drugs can be classified into four groups: glucocorticoids cytostatics; antibodies (including Biological Response Modifiers or DMARDs); drugs acting on immunophilins; other drugs, including known chemotherpeutic agents used in the treatment of proliferative disorders. For multiple sclerosis, in particular, the antibodies of the present invention can be administered in conjunction with a new class of myelin binding protein-like therapeutics, known as copaxones.

[0072] "Anti-inflammatory agents" or "anti-inflammatory drugs", is used to represent both steroidal and non-steroidal therapeutics. Steroids, also known as corticosteroids, are drugs that closely resemble Cortisol, a hormone produced naturally by adrenal glands. Steroids are used as the main treatment for certain inflammatory conditions, such as: Systemic vasculitis (inflammation of blood vessels); and Myositis (inflammation of muscle). Steroids might also be used selectively to treat inflammatory conditions such as: rheumatoid arthritis (chronic inflammatory arthritis occurring in joints on both sides of the body); systemic lupus erythematosus (a generalized disease caused by abnormal immune system function); Sjogren's syndrome (chronic disorder that causes dry eyes and a dry mouth).

[0073] Non-steroidal anti-inflammatory drugs, usually abbreviated to NSAIDs, are drugs with analgesic, antipyretic and anti-inflammatory effects - they reduce pain, fever and inflammation. The term "non-steroidal" is used to distinguish these drugs from steroids, which (amongst a broad range of other effects) have a similar eicosanoid-depressing, anti- inflammatory action. NSAIDs are generally indicated for the symptomatic relief of the following conditions: rheumatoid arthritis; osteoarthritis; inflammatory arthropathies (e.g. ankylosing spondylitis, psoriatic arthritis, Reiter's syndrome); acute gout ; dysmenorrhoea; metastatic bone pain; headache and migraine; postoperative pain ; mild-to-moderate pain due to inflammation and tissue injury; pyrexia; and renal colic. NSAIDs include salicylates, arlyalknoic acids, 2-arylpropionic acids (profens), N-arylanthranilic acids (fenamic acids), oxicams, coxibs, and sulphonanilides.

II. General

[0074] The present invention provides engineered anti-IL-23 antibodies and uses thereof to treat inflammatory, autoimmune, and proliferative disorders. [0075] A number of cytokines have a role in the pathology or repair of neurological disorders. IL-6, IL- 17, interferon-gamma (IFNgamma), and granulocyte colony-stimulating factor (GM-CSF) have been associated with multiple sclerosis (Matusevicius, et al. (1999) Multiple Sclerosis 5:101-104; Lock, et al (2002) Nature Med. 8:500-508). IL-I alpha, IL- lbeta, and transforming growth factor-beta 1 (TGF-betal) plays a role in ALS, Parkinson's disease, and Alzheimer's disease (Hoozemans, et al. (2001) Exp. Gerontol. 36:559-570; Griffin and Mrak (2002) J. Leukocyte Biol. 72:233-238; Ilzecka, et al. (2002) Cytokine 20:239-243). TNF-alpha, IL-lbeta, IL-6, IL-8, interferon-gamma (IFNgamma), and IL-17 appear to modulate response to brain ischemia (see, e.g., Kostulas, et al. (1999) Stroke 30:2174-2179; Li, et al. (200I) J. Neuroimmunol. 116:5-14). Vascular endothelial cell growth factor (VEGF) is associated with ALS (Cleveland and Rothstein (2001) Nature 2:806-819).

[0076] hiflammatory bowel disorders, e.g., Crohn's disease, ulcerative colitis, celiac disease, and irritable bowel syndrome, are mediated by cells of the immune system and by cytokines. For example, Crohn's disease is associated with increased IL- 12 and IFNγ, while ulcerative colitis is associated with increased IL-5, IL-13, and transforming growth factor- beta (TGFbeta). IL- 17 expression may also increase in Crohn's disease and ulcerative

colitis (see, e.g., Podolsky (2002) New Engl J. Med. 347:417-429; Bouma and Strober (2003) Nat. Rev. Immunol. 3:521-533; Bhan, et al. (1999) Immunol. Rev. 169:195-207; Hanauer (1996) New Engl. J. Med. 334:841-848; Green (2003) The Lancet 362:383-391; McManus (2003) New Engl. J. Med. 348:2573-2574; Horwitz and Fisher (2001) New Engl. J. Med. 344:1846-1850; Andoh, et al. (2002) Int. J. MoI. Med. 10:631-634; Nielsen, et al. (2003) Scand. J. Gastroenterol. 38:180-185; Fujino, et al. (2003) Gut 52:65-70). [0077] Inflammatory diseases of the skin, joints, CNS, as well as proliferative disorders elicit similar immune responses, thus IL-23 blockade should provide inhibition of these immune mediated inflammatory disorders, without comprising the host ability to fight systemic infections. Antagonizing IL-23 should relieve the inflammation associated with inflammatory bowel disease, Crohn's disease, Ulcerative Colitis, rheumatoid arthritis, psoriatic arthritis, psoriasis, and atopic dermatitis. Use of IL-23 inhibitors will also provide inhibition of proliferative disorders, e.g., cancer and autoimmune disorders e.g., multiple sclerosis, type I diabetes, and SLE. Descriptions of IL-23 in these various disorders can be found in the following published PCT applications: WO 04/081190; WO 04/071517; WO 00/53631; and WO 01/18051, all of which are incorporated herein by reference. [0078] The pl9 subunit of IL-23 is a member of the 'long chain' family of hematopoietic cytokines (Oppmann et al. (2000) supra) and comprises four packed α- helices termed A, B, C and D, with an up-up-down-down topology. The 4 helices are connected by 3 polypeptide loops. The A-B and C-D loops are modeled to be relatively long as they connect parallel helices. The short B-C loop connects the antiparallel B and C helices. The pi 9 subunit of IL-23 is a member of the IL-6 family of helical cytokines. This family of cytokines bind to their cognate receptors through three conserved epitopes (site I, II and III; Bravo and Heath (2000) EMBO J. 19:2399-2411). The ρl9 subunit interacts with three cytokine receptor subunits to form the competent signaling complex. When expressed in a cell, the pi 9 subunit first form a complex with the p40 subunit, which it shares with IL- 12. As noted above, the pl9p40 complex is secreted from the cell as a heterodimeric protein and is called IL-23 (See, e.g., Oppmann et al., supra). The cellular receptor complex required to transduce the IL-23 signal consists of two members of the tall signaling receptor subunits of the IL-6/IL-12 family of cytokines, the IL-23 -specific IL-23R (see, e.g., Parham et al. supra) and the IL-12Rbl, that is shared with IL-12.

[0079] Insights into the structural basis of 'long chain' cytokine/receptor recognition have shown that although large areas of protein surface are buried in formation of cytokine — receptor complexes, the affinity of the interaction is dominated by a few, often tightly clustered amino acid residues forming an energetic 'hot spot' in the center of the binding interface. The identity of the residues that dominate the binding energy of a large protein- protein interface has been termed the 'functional epitope'. The affinity of the interaction (and hence biological specificity) is consequently defined by the structural complementarity of the functional epitopes of ligand and receptor. Detailed mutagenesis studies have shown that the most significant residues that make up the functional epitopes of cytokines and receptors are hydrophobic contacts involving either non-polar side chains such as tryptophan, the aliphatic components of non-polar side chains or the polypeptide backbone. The non-polar 'core' is surrounded by a halo of polar residues of lesser importance for binding energy. Kinetic studies indicate that the primary role of the functional epitopes is to stabilize protein-protein interaction by decreasing the dissociation rate of the complex. It has been suggested that the initial contact between cytokine and receptor is dominated by random diffusion or 'rolling' of protein surfaces producing many unstable contacts. The complex is then stabilized when the functional epitopes of the receptor and ligand engage (see, e.g., Bravo and Heath, supra).

III. Generation of IL-23 Specific Antibodies

[0080] Any suitable method for generating monoclonal antibodies may be used. For example, a recipient may be immunized with a linked or unlinked (e.g. naturally occurring) form of the IL-23 heterodimer, or a fragment thereof. Any suitable method of immunization can be used. Such methods can include adjuvants, other immunostimulants, repeated booster immunizations, and the use of one or more immunization routes. [0081] Any suitable source of IL-23 can be used as the immunogen for the generation of the non-human antibody, specific for the p 19 subunit, of the compositions and methods disclosed herein. Such forms include, but are not limited whole protein, including linked and naturally occurring heterodimers, peptide(s), and epitopes, generated through recombinant, synthetic, chemical or enzymatic degradation means known in the art. [0082] Any form of the antigen can be used to generate the antibody that is sufficient to generate a biologically active antibody. Thus, the eliciting antigen may be a

single epitope, multiple epitopes, or the entire protein alone or in combination with one or more immunogenicity enhancing agents known in the art. The eliciting antigen may be an isolated full-length protein, a cell surface protein (e.g., immunizing with cells transfected with at least a portion of the antigen), or a soluble protein (e.g., immunizing with only the extracellular domain portion of the protein). The antigen may be produced in a genetically modified cell. The DNA encoding the antigen may genomic or non-genomic (e.g., cDNA) and encodes at least a portion of the extracellular domain. As used herein, the term "portion" refers to the minimal number of amino acids or nucleic acids, as appropriate, to constitute an immunogenic epitope of the antigen of interest. Any genetic vectors suitable for transformation of the cells of interest maybe employed, including but not limited to adenoviral vectors, plasmids, and non- viral vectors, such as cationic lipids. [0083] Any suitable method can be used to elicit an antibody with the desired biologic properties to inhibit IL-23. It is desirable to prepare monoclonal antibodies (mAbs) from various mammalian hosts, such as mice, rodents, primates, humans, etc. Description of techniques for preparing such monoclonal antibodies maybe found in, e.g., Stites, et al. (eds.) BASIC AND CLINICAL IMMUNOLOGY (4th ed.) Lange Medical Publications, Los Altos, CA, and references cited therein; Harlow and Lane (1988) ANTIBODIES: A LABORATORY MANUAL CSH Press; Goding (1986) MONOCLONAL ANTIBODIES: PRINCIPLES AND PRACTICE (2d ed.) Academic Press, New York, NY. Thus, monoclonal antibodies may be obtained by a variety of techniques familiar to researchers skilled in the art. Typically, spleen cells from an animal immunized with a desired antigen are immortalized, commonly by fusion with a myeloma cell. See Kohler and Milstein (1976) Eur. J. Immunol. 6:511-519. Alternative methods of immortalization include transformation with Epstein Barr Virus, oncogenes, or retroviruses, or other methods known in the art. See, e.g., Doyle, et al. (eds. 1994 and periodic supplements) CELL AND TISSUE CULTURE: LABORATORY PROCEDURES, John Wiley and Sons, New York, NY. Colonies arising from single immortalized cells are screened for production of antibodies of the desired specificity and affinity for the antigen, and yield of the monoclonal antibodies produced by such cells may be enhanced by various techniques, including injection into the peritoneal cavity of a vertebrate host. Alternatively, one may isolate DNA sequences which encode a monoclonal antibody or a binding fragment thereof by screening a DNA library from human B cells according, e.g., to the general protocol outlined by Huse, et al. (1989) Science 246:1275-1281.

[0084] Other suitable techniques involve selection of libraries of antibodies in phage or similar vectors. See, e.g., Huse et al., Science 246:1275-1281 (1989); and Ward et al., Nature 341:544-546 (1989). The polypeptides and antibodies of the present invention may be used with or without modification, including chimeric or humanized antibodies. Frequently, the polypeptides and antibodies will be labeled by joining, either covalently or non-covalently, a substance which provides for a detectable signal. A wide variety of labels and conjugation techniques are known and are reported extensively in both the scientific and patent literature. Suitable labels include radionuclides, enzymes, substrates, cofactors, inhibitors, fluorescent moieties, chemiluminescent moieties, magnetic particles, and the like. Patents teaching the use of such labels include U.S. Patent Nos. 3,817,837; 3,850,752; 3,939,350; 3,996,345; 4,277,437; 4,275,149; and 4,366,241. Also, recombinant immunoglobulins maybe produced, see Cabilly U.S. Patent No. 4,816,567; and Queen et al. (1989) Proc. Nat'lAcad. Sd. USA 86:10029-10033; or made in transgenic mice, see Mendez et al. (1997) Nature Genetics 15:146-156; also see Abgenix and Medarex technologies.

[0085] Antibodies or binding compositions against predetermined fragments of IL-

23 can be raised by immunization of animals with conjugates of the polypeptide, fragments, peptides, or epitopes with carrier proteins. Monoclonal antibodies are prepared from cells secreting the desired antibody. These antibodies can be screened for binding to normal or defective IL-23. These monoclonal antibodies will usually bind with at least a K^ of about 1 μM, more usually at least about 300 nM, typically at least about 30 nM, preferably at least about 10 nM, more preferably at least about 3 nM or better, usually determined by ELISA. Suitable non-human antibodies may also be identified using the biologic assays described in Example 5, below.

rV. Humanization of IL-23 Specific Antibodies

[0086] Any suitable non-human antibody can be used as a source for the hypervariable region. Sources for non-human antibodies include, but are not limited to, murine, Lagomorphs (including rabbits), bovine, and primates. For the most part, humanized antibodies are human immunoglobulins (recipient antibody) in which hypervariable region residues of the recipient are replaced by hypervariable region residues from a non-human species (donor antibody) such as mouse, rat, rabbit or nonhuman primate

having the desired specificity, affinity, and capacity. In some instances, Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non- human residues. Furthermore, humanized antibodies may comprise residues which are not found in the recipient antibody or in the donor antibody. These modifications are made to further refine antibody performance of the desired biological activity. For further details, see Jones et al. (1986) Nature 321:522-525; Reichmann et al. (1988) Nature 'hh' l-.h' l'S-'hlV; and Presta (1992) Curr. Op. Struct. Biol. 2:593-596.

[0087] Methods for recombinantly engineering antibodies have been described, e.g., by Boss et al. (U.S. Pat. No. 4,816,397), Cabilly et al. (U.S. Pat. No. 4,816,567), Law et al. (European Patent Application Publication No. 438 310) and Winter (European Patent Application Publication No. 239400).

[0088] Amino acid sequence variants of humanized anti-IL-23 antibody are prepared by introducing appropriate nucleotide changes into the humanized anti-IL-23 antibody DNA, or by peptide synthesis. Such variants include, for example, deletions from, and/or insertions into and/or substitutions of, residues within the amino acid sequences shown for the humanized anti-IL-23 F(ab) {e.g. as in SEQ ID NOs: 1 and 2). Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics. The amino acid changes also may alter post-translational processes of the humanized anti-IL-23 antibody, such as changing the number or position of glycosylation sites.

[0089] A useful method for identification of certain residues or regions of the humanized anti-IL-23pl9 antibody polypeptide that are preferred locations for mutagenesis is called "alanine scanning mutagenesis," as described by Cunningham and Wells (1989) Science 244: 1081-1085. Here, a residue or group of target residues are identified {e.g., charged residues such as Arg, Asp, His, Lys, and GIu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with IL-23 antigen. The amino acid residues demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution. Thus, while the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined. For example, to analyze the performance of a mutation at a given site, Ala

scanning or random mutagenesis is conducted at the target codon or region and the expressed humanized anti-IL-23pl9 antibody variants are screened for the desired activity. [0090] Amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from one residue to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues. Examples of terminal insertions include humanized anti-IL-23 antibody with an N-terminal methionyl residue or the antibody fused to an epitope tag. Other insertional variants of the humanized anti-IL-23 antibody molecule include the fusion to the N- or C-terminus of humanized anti-IL-23 antibody of an enzyme or a polypeptide which increases the serum half-life of the antibody.

[0091] Another type of variant is an amino acid substitution variant. These variants have at least one amino acid residue in the humanized anti-IL-23pl9 antibody molecule removed and a different residue inserted in its place. The sites of greatest interest for substitutional mutagenesis include the hypervariable loops, but FR alterations are also contemplated. Hypervariable region residues or FR residues involved in antigen binding are generally substituted in a relatively conservative manner.

[0092] Another type of amino acid variant of the antibody alters the original glycosylation pattern of the antibody. By altering is meant deleting one or more carbohydrate moieties found in the antibody, and/or adding one or more glycosylation sites that are not present in the antibody. Glycosylation of antibodies is typically either N-linked or O-linked. N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue. The tripeptide sequences asparagine-X-serine and asparagine-X- threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain. Thus, the presence of either of these tripeptide sequences in a polypeptide creates a potential glycosylation site. O-linked glycosylation refers to the attachment of one of the sugars N- aceylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5-hydroxylysine may also be used. [0093] Addition of glycosylation sites to the antibody is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tripeptide sequences (for N-linked glycosylation sites). The alteration may also be made by

the addition of, or substitution by, one or more serine or threonine residues to the sequence of the original antibody (for O-linked glycosylation sites).

[0094] Yet another type of amino acid variant is the substitution of residues to provide for greater chemical stability of the final humanized antibody. For example, an asparagine (N) residue may be changed to reduce the potential for formation of isoaspartate at any NG sequences within a rodent CDR. hi one embodiment, the asparagine is changed to glutamine (Q). Isoaspartate formation may debilitate or completely abrogate binding of an antibody to its target antigen. Presta (2005) J. Allergy Clin. Immunol. 116:731 at 734. In addition, methionine residues in rodent CDRs may be changed to reduce the possibility that the methionine sulfur would oxidize, which could reduce antigen binding affinity and also contribute to molecular heterogeneity in the final antibody preparation. Id. hi one embodiment, the methionine is changed to alanine (A). Antibodies with such substitutions are subsequently screened to ensure that the substitutions do not decrease IL-23pl9 binding affinity to unacceptable levels.

[0095] Nucleic acid molecules encoding amino acid sequence variants of humanized

IL-23 specific antibody are prepared by a variety of methods known in the art. These methods include, but are not limited to, isolation from a natural source (in the case of naturally occurring amino acid sequence variants) or preparation by oligonucleotide- mediated (or site-directed) mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlier prepared variant or a non- variant version of humanized anti-IL-23pl9 antibody. [0096] Ordinarily, amino acid sequence variants of the humanized anti-IL-23 antibody will have an amino acid sequence having at least 75% amino acid sequence identity with the original humanized antibody amino acid sequences of either the heavy or the light chain more preferably at least 80%, more preferably at least 85%, more preferably at least 90%, and most preferably at least 95%. Identity or homology with respect to this sequence is defined herein as the percentage of amino acid residues in the candidate sequence that are identical with the humanized anti-IL-23 residues, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity, and not considering any conservative substitutions as part of the sequence identity. None of N-terminal, C-terminal, or internal extensions, deletions, or insertions into the antibody sequence shall be construed as affecting sequence identity or homology.

[0097] The humanized antibody can be selected from any class of immunoglobulins, including IgM, IgG, IgD, IgA, and IgE. Preferably, the antibody is an IgG antibody. Any isotype of IgG can be used, including IgG ₁ , IgG ₂ , IgG ₃ , and IgG ₄ . Variants of the IgG isotypes are also contemplated. The humanized antibody may comprise sequences from more than one class or isotype. Optimization of the necessary constant domain sequences to generate the desired biologic activity is readily achieved by screening the antibodies in the biological assays described below.

[0098] Likewise, either class of light chain can be used in the compositions and methods herein. Specifically, kappa, lambda, or variants thereof are useful in the present compositions and methods.

[0099] Any suitable portion of the CDR sequences from the non-human antibody can be used. The CDR sequences can be mutagenized by substitution, insertion or deletion of at least one residue such that the CDR sequence is distinct from the human and non- human antibody sequence employed. It is contemplated that such mutations would be minimal. Typically, at least 75% of the humanized antibody residues will correspond to those of the non-human CDR residues, more often 90%, and most preferably greater than 95%.

[00100] Any suitable portion of the FR sequences from the human antibody can be used. The FR sequences can be mutagenized by substitution, insertion or deletion of at least one residue such that the FR sequence is distinct from the human and non-human antibody sequence employed. It is contemplated that such mutations would be minimal. Typically, at least 75% of the humanized antibody residues will correspond to those of the human FR residues, more often 90%, and most preferably greater than 95%. [00101] CDR and FR residues are determined according to the standard sequence definition of Kabat. Kabat et al., Sequences of Proteins of Immunological Interest, National Institutes of Health, Bethesda Md. (1987). SEQ ID NOs: 5 - 16 and 31 - 48 show the heavy chain variable domain sequences of various mouse anti-human IL-23pl9 antibodies, and SEQ ID NOs: 17 - 28 and 49 - 65 depict the light chain variable domain sequences. SEQ ID NOs: 66 - 68 are consensus sequences for heavy chain CDRs (CDRHl, CDRH2 and CDRH3), and are comprised of the most common amino acid residue at each position in the heavy chain CDRs for the family of antibodies consisting of 7G10, 6H12, 13Fl 1, 13B5, 7E2, 13Gl, 11C10, IElO, 30Fl 1, 34E4, 5B12, 6H4, 9C9, 11B10, 30El, 33D2, 20A9, 22E9,

29D5, 21A10 and 33B12. FIGS. 1A-1C provide a sequence lineup of heavy chains of various antibodies of the present invention.

[00102] As shown in FIGS. 2A-2C, the light chain CDRs of the antibodies of the present invention disclosed herein are grouped into three subfamilies, referred to as (a), (b) and (c). Light chain subfamily (a) consists of antibodies 7G10, 6H12, 13Fl 1, 13B5, 7E2, 13Gl, 1 IClO, 30Fl 1, 34E4, 6H4, 33D2 and 33B12. Light chain subfamily (b) consists of antibodies IElO, 20A9, 22E9, 29D5, 5B12, 9C9 and 1 IBlO. Light chain subfamily (c) consists of antibodies 10H11, 19E9, 10G8, 39G2, 35F12, 49A10, 34F9 and 7D7. These light chain subfamilies were used to derive consensus CDR sequences of CDRLl (a), CDRLl(b) and CDRLl(c) (SEQ ID NOs: 69 - 71) and corresponding consensus sequences CDRL2 (SEQ ID NOs: 72 - 74) and CDRL3 (SEQ ID NOs: 75 - 77) for each subfamily. Consensus sequences for light chain CDRs are comprised of the most common amino acid residue at each position in the light chain CDRs for each subfamily of antibodies. [00103] Tables 2 and 3 define various domains of humanized anti-IL-23pl9 antibodies 6H12, 7G10, 10Hl 1 and 22E9, as well as and the light and heavy chain variable domains of several murine antibodies of the present invention. Residues l-19 of SEQ ID NOs: 1 - 4 represent signal sequences for heavy and light strands of hum6H12 and hum7G10. Light chain constant domains of hum6H12 and hum7G10 are at residues 130- 233 of SEQ ID NOs: 2 and 4, respectively. Heavy chain constant domains of hum6H12 and hum 7G10 are at residues 135-464 of SEQ ID NOs: 1 and 3, respectively, with CHl at residues 135-242, CH2+hinge at residues 243-357 and CH3 at residues 358-464. AU other antibodies are presented as light and heavy chain variable regions (V _L and V _H ), and thus lack signal sequences and constant domains.

Table 2 Light Chain Sequences and Domains

Table 3 Heavy Chain Sequences and Domains

[00104] In one embodiment, the antibodies of the present invention or binding fragments thereof comprise CDRs comprising one of several variable amino acids at certain positions. In one embodiment antibodies of the present invention, or binding fragments thereof, comprise the "CDR Variable" domains listed at SEQ ID NOs: 78 - 89. These "CDR Variable" sequences include the consensus sequence of each family of related antibodies as well as variable positions encompassing all observed sequence variants within that family. Such sequence variants are displayed in FIGS. IA - 1C and 2A - 2C. [00105] In another embodiment, the variable amino acids in potential CDRs are selected from those amino acids appearing two or more times in the families reported herein. These antibodies are a subset of the "CDR Variable" antibodies described above in which amino acids that appear only once at a given position in a CDR in a given family of sequences are not included in the pool of potential CDRs. These "single occurrence" amino acid substitutions are readily determined, and thus excluded from the "CDR Variable" sequences, by simple inspection of FIGS. IA - 1C and 2A - 2C. This narrowed range of potential CDR sequences is referred to herein as a "multiple occurrence variable CDR." This nomenclature is used herein for convenience in referring to this subset of the "CDR Variable" sequences.

[00106] hi yet another embodiment, potential CDRs are not limited to the "CDR

Variable" sequences described above, but also include conservatively modified variants of any observed amino acid, as determined using the data of Table 1. [00107] Li a further embodiment, potential CDRs include variants of any single sequence CDR disclosed herein, including consensus sequences SEQ ID NOs: 66 - 77, in which the variant comprises 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more conservative amino acid substitutions relative to the disclosed sequence, as determined using the data of Table 1. [00108] Also contemplated are chimeric antibodies. As noted above, typical chimeric antibodies comprise a portion of the heavy and/or light chain identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so

long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; and Morrison et al. (1984) Proc. Natl. Acad. Sci. USA Sl: 6851-6855).

[00109] Bispecific antibodies are also useful in the present methods and compositions. As used herein, the term "bispecific antibody" refers to an antibody, typically a monoclonal antibody, having binding specificities for at least two different antigenic epitopes, e.g., IL-23pl9 and IL-23p40. In one embodiment, the epitopes are from the same antigen, hi another embodiment, the epitopes are from two different antigens. Methods for making bispecific antibodies are known in the art. For example, bispecific antibodies can be produced recombinantly using the co-expression of two immunoglobulin heavy chain/light chain pairs. See, e.g., Milstein et al. (1983) Nature 305: 537-39. Alternatively, bispecific antibodies can be prepared using chemical linkage. See, e.g., Brennan, et al. (1985) Science 229: 81. Bispecific antibodies include bispecific antibody fragments. See, e.g., Hollinger, et al. (1993) Proc. Natl. Acad. ScL U.S.A. 90: 6444-48, Gruber, et al, J. Immunol. 152: 5368 (1994).

[00110] In yet other embodiments, different constant domains may be appended to the humanized V _L and V _H regions provided herein. For example, if a particular intended use of an antibody (or fragment) of the present invention were to call for altered effector functions, a heavy chain constant domain other than IgGl may be used. Although IgGl antibodies provide for long half-life and for effector functions, such as complement activation and antibody-dependent cellular cytotoxicity, such activities may not be desirable for all uses of the antibody. In such instances an IgG4 constant domain, for example, may be used.

V. Biological Activity of Humanized Anti-IL-23

[00111] Antibodies having the characteristics identified herein as being desirable in a humanized anti-IL-23 antibody can be screened for inhibitory biologic activity in vitro or suitable binding affinity. To screen for antibodies that bind to the epitope on human IL-23 (i.e. the pl9 subunit) bound by an antibody of interest {e.g., those which block binding of the cytokine to its receptor), a routine cross-blocking assay such as that described in ANTIBODIES, A LABORATORY MANUAL, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988), can be performed. Antibodies that bind to the same epitope are likely to cross-block in such assays, but not all cross-blocking antibodies will necessarily bind at

precisely the same epitope since cross-blocking may result from steric hindrance of antibody binding by antibodies bound at nearby, or even overlapping, epitopes. [00112] Alternatively, epitope mapping, e.g., as described in Champe et al. (1995) J.

Biol. Chem. 270:1388-1394, can be performed to determine whether the antibody binds an epitope of interest. "Alanine scanning mutagenesis," as described by Cunningham and Wells (1989) Science 244: 1081-1085, or some other form of point mutagenesis of amino acid residues in human IL-23 may also be used to determine the functional epitope for an anti-IL-23 antibody of the present invention. Mutagenesis studies, however, may also reveal amino acid residues that are crucial to the overall three-dimensional structure of IL-23 but that are not directly involved in antibody-antigen contacts, and thus other methods may be necessary to confirm a functional epitope determined using this method. [00113] The epitope bound by a specific antibody may also be determined by assessing binding of the antibody to peptides comprising fragments of human IL-23pl9 (SEQ ID NO: 39). A series of overlapping peptides encompassing the sequence of IL- 23pl9 may be synthesized and screened for binding, e.g. in a direct ELISA, a competitive ELISA (where the peptide is assessed for its ability to prevent binding of an antibody to IL- 23pl9 bound to a well of a microtiter plate), or on a chip. Such peptide screening methods may not be capable of detecting some discontinuous functional epitopes, i.e. functional epitopes that involve amino acid residues that are not contiguous along the primary sequence of the IL-23pl9 polypeptide chain.

[00114] The epitope bound by antibodies of the present invention may also be determined by structural methods, such as X-ray crystal structure determination (e.g., WO2005/044853), molecular modeling and nuclear magnetic resonance (NMR) spectroscopy, including NMR determination of the H-D exchange rates of labile amide hydrogens in IL-23 when free and when bound in a complex with an antibody of interest (Zinn- Justin et al.(1992) Biochemistry 31, 11335-11347; Zinn- Justin et al. (1993) Biochemistry 32, 6884-6891).

[00115] With regard to X-ray crystallography, crystallization may be accomplished using any of the known methods in the art (e.g. Giege et al. (1994) Acta Crystallogr. D50:339-350; McPherson (1990) Eur. J. Biochem. 189:1-23), including microbatch (e.g. Chayen (1997) Structure 5:1269-1274), hanging-drop vapor diffusion (e.g. McPherson (1976) J. Biol. Chem. 251 :6300 -6303), seeding and dialysis. It is desirable to use a protein

preparation having a concentration of at least about 1 mg/mL and preferably about 10 mg/mL to about 20 mg/mL. Crystallization may be best achieved in a precipitant solution containing polyethylene glycol 1000-20,000 (PEG; average molecular weight ranging from about 1000 to about 20,000 Da), preferably about 5000 to about 7000 Da, more preferably about 6000 Da, with concentrations ranging from about 10% to about 30% (w/v). It may also be desirable to include a protein stabilizing agent, e.g. glycerol at a concentration ranging from about 0.5% to about 20%. A suitable salt, such as sodium chloride, lithium chloride or sodium citrate may also be desirable in the precipitant solution, preferably in a concentration ranging from about 1 mM to about 1000 mM. The precipitant is preferably buffered to a pH of from about 3.0 to about 5.0, preferably about 4.0. Specific buffers useful in the precipitant solution may vary and are well-known in the art (Scopes, Protein Purification: Principles and Practice, Third ed., (1994) Springer- Verlag, New York). Examples of useful buffers include, but are not limited to, HEPES, Tris, MES and acetate. Crystals maybe grow at a wide range of temperatures, including 2°C, 4°C, 8°C and 26 ⁰ C. [00116] Antibody:antigen crystals may be studied using well-known X-ray diffraction techniques and may be refined using computer software such as X-PLOR (Yale University, 1992, distributed by Molecular Simulations, Inc.; see e.g. Blundell & Johnson (1985) Meth. Enzymol. 114 & 115, H. W. Wyckoff et al, eds., Academic Press; U.S. Patent Application Publication No. 2004/0014194), and BUSTER (Bricogne (1993) Acta Cryst. D49:37-60; Bricogne (1997) Meth. Enzymol. 276A:361-423, Carter & Sweet, eds.; Roversi et al. (2000) Acta Cryst. D56:1313-1323), the disclosures of which are hereby incorporated by reference in their entireties.

[00117] Additional antibodies binding to the same epitope as an antibody of the present invention may be obtained, for example, by screening of antibodies raised against IL-23 for binding to the epitope, or by immunization of an animal with a peptide comprising a fragment of human IL-23 comprising the epitope sequence. Antibodies that bind to the same functional epitope might be expected to exhibit similar biological activities, such as blocking receptor binding, and such activities can be confirmed by functional assays of the antibodies.

[00118] Antibody affinities {e.g. for human IL-23) may be determined using standard analysis. Preferred humanized antibodies are those which bind human IL-23pl9 with a K _D

value of no more than about IxIO ^"7 ; preferably no more than about IxIO ^"8 ; more preferably no more than about IxIO ^"9 ; and most preferably no more than about IxIO ^"10 M. [00119] The antibodies and fragments thereof useful in the present compositions and methods are biologically active antibodies and fragments. As used herein, the term "biologically active" refers to an antibody or antibody fragment that is capable of binding the desired the antigenic epitope and directly or indirectly exerting a biologic effect. Typically, these effects result from the failure of IL-23 to bind its receptor. As used herein, the term "specific" refers to the selective binding of the antibody to the target antigen epitope. Antibodies can be tested for specificity of binding by comparing binding to IL-23 to binding to irrelevant antigen or antigen mixture under a given set of conditions. If the antibody binds to IL-23 at least 10, and preferably 50 times more than to irrelevant antigen or antigen mixture then it is considered to be specific. An antibody that "specifically binds" to IL-23 does not bind to proteins that do not comprise the EL-23-derived sequences, i.e. "specificity" as used herein relates to IL-23 specificity, and not any other sequences that may be present in the protein in question. For example, as used herein, an antibody that "specifically binds" to IL-23 will typically bind to FLAG-hIL-23, which is a fusion protein comprising IL-23 and a FLAG ^® peptide tag, but it does not bind to the FLAG ^® peptide tag alone or when it is fused to a protein other than IL-23.

[00120] IL-23 -specific binding compounds of the present invention, such as inhibitory IL-23pl9 specific antibodies, can inhibit its biological activity in any manner, including but not limited to production of IL-I β and TNF by peritoneal macrophages and IL-17 by T _H 17 T cells (see Langrish et al. (2004) Immunol. Rev. 202:96-105). Anti-IL- 23pl9 antibodies will also be able to inhibit the gene expression of IL-17A, IL-17F, CCL7, CCL17, CCL20, CCL22, CCRl, and GM-CSF (see Langrish et al. (2005) J. Exp. Med. 201:233-240). IL-23 -specific binding compounds of the present invention, such as anti IL- 23pl9 antibodies, will also block the ability of IL-23 to enhance proliferation or survival of T _H 17 cells. Cua and Kastelein (2006) Nat. Immunol. 7:557-559. The inhibitory activity of engineered anti-IL-23pl9 will be useful in the treatment of inflammatory, autoimmune, and proliferative disorders. Such disorders are described in PCT patent application publications WO 04/081190; WO 04/071517; WO 00/53631; and WO 01/18051, the disclosures of which are hereby incorporated by reference in their entireties.

VI. Pharmaceutical Compositions

[00122] To prepare pharmaceutical or sterile compositions including an agonist or antagonist of IL-23, the cytokine analogue or mutein, antibody thereto, or nucleic acid thereof, is admixed with a pharmaceutically acceptable carrier or excipient, see, e.g., Remington's Pharmaceutical Sciences and U.S. Pharmacopeia: National Formulary, Mack Publishing Company, Easton, PA (1984).

[00123] Formulations of therapeutic and diagnostic agents may be prepared by mixing with physiologically acceptable carriers, excipients, or stabilizers in the form of, e.g., lyophilized powders, slurries, aqueous solutions or suspensions (see, e.g., Hardman, et al. (2001) Goodman and Gilman 's The Pharmacological Basis of Therapeutics, McGraw- Hill, New York, NY; Gennaro (2000) Remington: The Science and Practice of Pharmacy, Lippincott, Williams, and Wilkins, New York, NY; Avis, et al. (eds.) (1993) Pharmaceutical Dosage Forms: Parenteral Medications, Marcel Dekker, NY; Lieberman, et al. (eds.) (1990) Pharmaceutical Dosage Forms: Tablets, Marcel Dekker, NY; Lieberman, et al. (eds.) (1990) Pharmaceutical Dosage Forms: Disperse Systems, Marcel Dekker, NY; Weiner and Kotkoskie (2000) Excipient Toxicity and Safety, Marcel Dekker, Inc., New York, NY).

[0100] Toxicity and therapeutic efficacy of the antibody compositions, administered alone or in combination with an immunosuppressive agent, can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD5 ₀ (the dose lethal to 50% of the population) and the EDso (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio between LD ₅₀ and ED _5O . Antibodies exhibiting high therapeutic indices are preferred. The data obtained from these cell culture assays and animal studies can be used in formulating a range of dosage for use in human. The dosage of such compounds lies preferably within a range of circulating concentrations that include the ED ₅₀ with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.

[0101] The mode of administration is not particularly important. Suitable routes of administration may, for example, include oral, rectal, transmucosal, or intestinal administration; parenteral delivery, including intramuscular, subcutaneous, intramedullary

injections, as well as intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, or intraocular injections. Administration of antibody used in the pharmaceutical composition or to practice the method of the present invention can be carried out in a variety of conventional ways, such as oral ingestion, inhalation, topical application or cutaneous, subcutaneous, intraperitoneal, parenteral, intraarterial or intravenous injection. Intravenous administration to the patient is preferred.

[0102] Alternately, one may administer the antibody in a local rather than systemic manner, for example, via injection of the antibody directly into an arthritic joint or pathogen-induced lesion characterized by immunopathology, often in a depot or sustained release formulation. Furthermore, one may administer the antibody in a targeted drug delivery system, for example, in a liposome coated with a tissue-specific antibody, targeting, for example, arthritic joint or pathogen-induced lesion characterized by immunopathology. The liposomes will be targeted to and taken up selectively by the afflicted tissue. [0103] Selecting an administration regimen for a therapeutic depends on several factors, including the serum or tissue turnover rate of the entity, the level of symptoms, the immunogenicity of the entity, and the accessibility of the target cells in the biological matrix. Preferably, an administration regimen maximizes the amount of therapeutic delivered to the patient consistent with an acceptable level of side effects. Accordingly, the amount of biologic delivered depends in part on the particular entity and the severity of the condition being treated. Guidance in selecting appropriate doses of antibodies, cytokines, and small molecules are available (see, e.g., Wawrzynczak (1996) Antibody Therapy, Bios Scientific Pub. Ltd, Oxfordshire, UK; Kresina (ed.) (1991) Monoclonal Antibodies, Cytokines and Arthritis, Marcel Dekker, New York, NY; Bach (ed.) (1993) Monoclonal Antibodies and Peptide Therapy in Autoimmune Diseases, Marcel Dekker, New York, NY; Baert, et al. (2003) New Engl. J. Med. 348:601-608; Milgrom, et al. (1999) New Engl. J. Med. 341:1966-1973; Slamon, et al. (2001) New Engl. J. Med. 344:783-792; Beniaminovitz, et al. (2000) New Engl. J. Med. 342:613-619; Ghosh, et al. (2003) New Engl. J. Med. 348:24-32; Lipsky, et al. (2000) New Engl. J. Med. 343:1594-1602). [0104] Determination of the appropriate dose is made by the clinician, e.g., using parameters or factors known or suspected in the art to affect treatment or predicted to affect treatment. Generally, the dose begins with an amount somewhat less than the optimum dose and it is increased by small increments thereafter until the desired or optimum effect is

achieved relative to any negative side effects. Important diagnostic measures include those of symptoms of, e.g., the inflammation or level of inflammatory cytokines produced. Preferably, a biologic that will be used is derived from the same species as the animal targeted for treatment, thereby minimizing an inflammatory, autoimmune, or proliferative response to the reagent.

[0105] Antibodies, antibody fragments, and cytokines can be provided by continuous infusion, or by doses at intervals of, e.g., one day, one week, or 1-7 times per week. Doses may be provided intravenously, subcutaneously, topically, orally, nasally, rectally, intramuscular, intracerebrally, intraspinally, or by inhalation. A preferred dose protocol is one involving the maximal dose or dose frequency that avoids significant undesirable side effects. A total weekly dose is generally at least 0.05 μg/kg body weight, more generally at least 0.2 μg/kg, most generally at least 0.5 μg/kg, typically at least 1 μg/kg, more typically at least 10 μg/kg, most typically at least 100 μg/kg, preferably at least 0.2 mg/kg, more preferably at least 1.0 mg/kg, most preferably at least 2.0 mg/kg, optimally at least 10 mg/kg, more optimally at least 25 mg/kg, and most optimally at least 50 mg/kg (see, e.g., Yang, et al. (2003) New Engl. J. Med. 349:427-434; Herald, et al. (2002) New Engl. J. Med. 346:1692-1698; Liu, et al. (1999) J. Neurol. Neurosurg. Psych. 67:451-456; Portielji, et al. (20003) Cancer Immunol. Immunother. 52:133-144). The desired dose of a small molecule therapeutic, e.g., a peptide mimetic, natural product, or organic chemical, is about the same as for an antibody or polypeptide, on a moles/kg basis. [0106] As used herein, "inhibit" or "treat" or "treatment" includes a postponement of development of the symptoms associated with autoimmune disease or pathogen-induced immunopathology and/or a reduction in the severity of such symptoms that will or are expected to develop. The terms further include ameliorating existing uncontrolled or unwanted autoimmune-related or pathogen-induced immunopathology symptoms, preventing additional symptoms, and ameliorating or preventing the underlying causes of such symptoms. Thus, the terms denote that a beneficial result has been conferred on a vertebrate subject with an autoimmune or pathogen-induced immunopathology disease or symptom, or with the potential to develop such a disease or symptom. [0107] As used herein, the term "therapeutically effective amount" or "effective amount" refers to an amount of an IL-23pl9 specific binding compound, e.g. and antibody, that when administered alone or in combination with an additional therapeutic agent to a

cell, tissue, or subject is effective to prevent or ameliorate the autoimmune disease or pathogen-induced immunopathology associated disease or condition or the progression of the disease. A therapeutically effective dose further refers to that amount of the compound sufficient to result in amelioration of symptoms, e.g., treatment, healing, prevention or amelioration of the relevant medical condition, or an increase in rate of treatment, healing, prevention or amelioration of such conditions. When applied to an individual active ingredient administered alone, a therapeutically effective dose refers to that ingredient alone. When applied to a combination, a therapeutically effective dose refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered in combination, serially or simultaneously. An effective amount of therapeutic will decrease the symptoms typically by at least 10%; usually by at least 20%; preferably at least about 30%; more preferably at least 40%, and most preferably by at least 50%. [0108] Methods for co-administration or treatment with a second therapeutic agent, e.g., a cytokine, steroid, chemotherapeutic agent, antibiotic, or radiation, are well known in the art, see, e.g., Hardman, et al. (eds.) (2001) Goodman and Gilman 's The Pharmacological Basis of Therapeutics, 10 ^th ed., McGraw-Hill, New York, NY; Poole and Peterson (eds.) (2001) Pharmacotherapeutics for Advanced Practice: A Practical Approach, Lippincott, Williams & Wilkins, Phila., PA; Chabner and Longo (eds.) (2001) Cancer Chemotherapy and Biotherapy, Lippincott, Williams & Wilkins, Phila., PA. The pharmaceutical composition of the invention may also contain other immunosuppressive or immunomodulating agents. Any suitable immunosuppressive agent can be employed, including but not limited to anti-inflammatory agents, corticosteroids, cyclosporine, tacrolimus (i.e., FK-506), sirolimus, interferons, soluble cytokine receptors (e.g., sTNRF and sIL-lR), agents that neutralize cytokine activity (e.g., inflixmab, etanercept), mycophenolate mofetil, 15-deoxyspergualin, thalidomide, glatiramer, azathioprine, leflunomide, cyclophosphamide, methotrexate, and the like. The pharmaceutical composition can also be employed with other therapeutic modalities such as phototherapy and radiation.

[0109] Typical veterinary, experimental, or research subjects include monkeys, dogs, cats, rats, mice, rabbits, guinea pigs, horses, and humans.

VII. Antibody Production

[0110] For recombinant production of the antibodies of the present invention, the nucleic acids encoding the two chains are isolated and inserted into one or more replicable vectors for further cloning (amplification of the DNA) or for expression. DNA encoding the monoclonal antibody is readily isolated and sequenced using conventional procedures (e.g., by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of the antibody). Many vectors are available. The vector components generally include, but are not limited to, one or more of the following: a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence. Li one embodiment, both the light and heavy chains of the humanized anti-IL-23pl9 antibody of the present invention are expressed from the same vector, e.g. a plasmid or an adenoviral vector. [0111] Antibodies of the present invention may be produced by any method known in the art. hi one embodiment, antibodies are expressed in mammalian or insect cells in culture, such as Chinese hamster ovary (CHO) cells, human embryonic kidney (HEK) 293 cells, mouse myeloma NSO cells, baby hamster kidney (BHK) cells, Spodopterafrugiperda ovarian (Sf9) cells. In one embodiment, antibodies secreted from CHO cells are recovered and purified by standard chromatographic methods, such as protein A, cation exchange, anion exchange, hydrophobic interaction, and hydroxyapatite chromatography. Resulting antibodies are concentrated and stored in 20 mM sodium acetate, pH 5.5. [0112] hi another embodiment, the antibodies of the present invention are produced in yeast according to the methods described in WO2005/040395. Briefly, vectors encoding the individual light or heavy chains of an antibody of interest are introduced into different yeast haploid cells, e.g. different mating types of the yeast Pichiapastoris, which yeast haploid cells are optionally complementary auxotrophs. The transformed haploid yeast cells can then be mated or fused to give a diploid yeast cell capable of producing both the heavy and the light chains. The diploid strain is then able to secret the fully assembled and biologically active antibody. The relative expression levels of the two chains can be optimized, for example, by using vectors with different copy number, using transcriptional promoters of different strengths, or inducing expression from inducible promoters driving transcription of the genes encoding one or both chains.

[0113] hi one embodiment, the respective heavy and light chains of a plurality of different anti-IL-23pl9 antibodies (the "original" antibodies) are introduced into yeast

haploid cells to create a library of haploid yeast strains of one mating type expressing a plurality of light chains, and a library of haploid yeast strains of a different mating type expressing a plurality of heavy chains. These libraries of haploid strains can be mated (or fused as spheroplasts) to produce a series of diploid yeast cells expressing a combinatorial library of antibodies comprised of the various possible permutations of light and heavy chains. The combinatorial library of antibodies can then be screened to determine whether any of the antibodies has properties that are superior (e.g. higher affinity for IL-23) to those of the original antibodies. See. e.g., WO2005/040395.

[0114] In another embodiment, antibodies of the present invention are human domain antibodies in which portions of an antibody variable domain are linked in a polypeptide of molecular weight approximately 13 kDa. See, e.g., U.S. Pat. Publication No. 2004/0110941. Such single domain, low molecular weight agents provide numerous advantages in terms of ease of synthesis, stability, and route of administration.

VIII. Uses

[0115] The present invention provides methods for using engineered anti-IL-23 for the treatment and diagnosis of inflammatory disorders and conditions, e.g., of the central nervous system, peripheral nervous system, and gastrointestinal tract, as well as autoimmune and proliferative disorders.

[0116] Methods are provided for the treatment of, e.g., multiple sclerosis (MS), including relapsing-remitting MS and primary progressive MS, Alzheimer's disease, amyotrophic lateral sclerosis (a.k.a. ALS; Lou Gehrig's disease), ischemic brain injury, prion diseases, and HPV-associated dementia. Also provided are methods for treating neuropathic pain, posttraumatic neuropathies, Guillain-Barre syndrome (GBS), peripheral polyneuropathy, and nerve regeneration.

[0117] Provided are methods for treating or ameliorating one or more of the following features, symptoms, aspects, manifestations, or signs of multiple sclerosis, or other inflammatory disorder or condition of the nervous system: brain lesions, myelin lesions, demyelination, demyelinated plaques, visual disturbance, loss of balance or coordination, spasticity, sensory disturbances, incontinence, pain, weakness, fatigue, paralysis, cognitive impairment, bradyphrenia, diplopia, optic neuritis, paresthesia, gait ataxia, fatigue, Uhtoff s symptom, neuralgia, aphasia, apraxia, seizures, visual-field loss,

dementia, extrapyramidal phenomena, depression, sense of well-being, or other emotional symptoms, chronic progressive myelopathy, and a symptom detected by magnetic resonance imaging (MRI), including gadolinium-enhancing lesions, evoked potential recordings, or examination of cerebrospinal fluid (see, e.g., Kenealy et al. (2003) J. Neuroimmunol. 143:7- 12; Noseworthy et al. (2000) New Engl. J. Med. 343:938-952; Miller et al. (2003) New Engl. J. Med. 348:15-23; Chang et al. (2002) New Engl. J. Med. 346:165-173; Brack and Stadelmann (2003) Neurol. ScL 24 Suppl.5:S265-S267).

[0118] Moreover, the present invention provides methods for treating and diagnosing inflammatory bowel disorders, e.g., Crohn's disease, ulcerative colitis, celiac disease, and irritable bowel syndrome. Provides are methods for treating or ameliorating one or more of the following symptoms, aspects, manifestations, or signs of an inflammatory bowel disorder: malabsorption of food, altered bowel motility, infection, fever, abdominal pain, diarrhea, rectal bleeding, weight loss, signs of malnutrition, perianal disease, abdominal mass, and growth failure, as well as intestinal complications such as stricture, fistulas, toxic megacolon, perforation, and cancer, and including endoscopic findings, such as, friability, aphthous and linear ulcers, cobblestone appearance, pseudopolyps, and rectal involvement and, in addition, anti-yeast antibodies (see, e.g., Podolsky, supra; Hanauer, supra; Horwitz and Fisher, supra).

[0119] Also contemplated is treatment of inflammatory disorders such as psoriasis, atopic dermatitis, arthritis, including rheumatoid arthritis, osteoarthritis, and psoriatic arthritis, autoimmune disorders, such as systemic lupus erythematosus and type I diabetes, and proliferative disorders such as cancer (see, e.g., PCT patent applications WO 04/081190; WO 04/071517; WO 00/53631; and WO 01/18051).

[0120] The IL-23pl9 binding compounds of the present invention can also be used in combination with one or more antagonists of other cytokines (e.g. antibodies), including but not limited to, IL-17A, IL-I β, IL-6 and TGF-β. See, e.g., Veldhoen (2006) Immunity 24:179-189; Dong (2006) Nat. Rev. Immunol. 6(4):329-333. In various embodiments, an IL-23pl9 binding compound of the invention is administered before, concurrently with, or after administration of the another antagonist or antagonists, such as an anti-IL-17A antibody, hi one embodiment, an IL-17 A binding compound is used in treatment of the acute early phase of an adverse immune response (e.g. MS, Crohn's Disease) alone or in combination with an IL-23 antagonist antibody of the present invention, hi the latter case,

the IL-17 A binding compound may be gradually decreased and treatment with the antagonist of IL-23 alone is continued to maintain suppression of the adverse response. Alternatively, antagonists to IL- lβ, IL-6 and/or TGF-β may be administered concurrently, before or after an IL-23pl9 binding compound of the present invention. See Cua and Kastelein (2006) Nat. Immunol. 7:557-559; Tato and O'Shea (2006) Nature 441:166-168; Iwakura and Ishigame (2006) J. CHn. Invest. 116:1218-1222.

[0121] The broad scope of this invention is best understood with reference to the following examples, which are not intended to limit the inventions to the specific embodiments.

[0122] All citations herein are incorporated herein by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.

[0123] Many modifications and variations of this invention can be made without departing from its spirit and scope, as will be apparent to those skilled in the art. The specific embodiments described herein are offered by way of example only, and the invention is to be limited by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled; and the invention is not to be limited by the specific embodiments that have been presented herein by way of example.

EXAMPLES

Example 1 General Methods

[0124] Standard methods in molecular biology are described (Maniatis et al. (1982)

Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY; Sambrook and Russell (2001) Molecular Cloning, 3 ^rd ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY; Wu (1993) Recombinant DNA, Vol. 217, Academic Press, San Diego, CA). Standard methods also appear in Ausbel et al. (2001) Current Protocols in Molecular Biology, VoIs.1-4, John Wiley and Sons, Inc. New York, NY, which describes cloning in bacterial cells and DNA mutagenesis (Vol. 1),

cloning in mammalian cells and yeast (Vol. 2), glycoconjugates and protein expression (Vol. 3), and bioinformatics (Vol. 4).

[0125] Methods for protein purification including immunoprecipitation, chromatography, electrophoresis, centrifugation, and crystallization are described (Coligan et al. (2000) Current Protocols in Protein Science, Vol. 1, John Wiley and Sons, Inc., New York). Chemical analysis, chemical modification, post-translational modification, production of fusion proteins, glycosylation of proteins are described (see, e.g., Coligan et al. (2000) Current Protocols in Protein Science, Vol. 2, John Wiley and Sons, Inc., New York; Ausubel et al. (2001) Current Protocols in Molecular Biology, Vol. 3, John Wiley and Sons, Inc., NY, NY, pp. 16.0.5-16.22.17; Sigma-Aldrich, Co. (2001) Products for Life Science Research, St. Louis, MO; pp. 45-89; Amersham Pharmacia Biotech (2001) BioDirectory, Piscataway, N.J., pp. 384-391). Production, purification, and fragmentation of polyclonal and monoclonal antibodies are described (Coligan et al. (2001) Current Protcols in Immunology, Vol. 1, John Wiley and Sons, Inc., New York; Harlow and Lane (1999) Using Antibodies, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY; Harlow and Lane, supra). Standard techniques for characterizing ligand/receptor interactions are available (see, e.g., Coligan et al. (2001) Current Protcols in Immunology, Vol. 4, John Wiley, Inc., New York).

[0126] Methods for flow cytometry, including fluorescence activated cell sorting

(FACS), are available (see, e.g., Owens et al. (1994) Flow Cytometry Principles for Clinical Laboratory Practice, John Wiley and Sons, Hoboken, NJ; Givan (2001) Flow Cytometry, 2 ^nd ed.; Wiley-Liss, Hoboken, NJ; Shapiro (2003) Practical Flow Cytometry, John Wiley and Sons, Hoboken, NJ). Fluorescent reagents suitable for modifying nucleic acids, including nucleic acid primers and probes, polypeptides, and antibodies, for use, e.g., as diagnostic reagents, are available (Molecular Probes (2003) Catalogue, Molecular Probes, Inc., Eugene, OR; Sigma-Aldrich (2003) Catalogue, St. Louis, MO). [0127] Standard methods of histology of the immune system are described (see, e.g.,

Muller-Harmelink (ed.) (1986) Human Thymus: Histopathology and Pathology, Springer Verlag, New York, NY; Hiatt, et al. (2000) Color Atlas of Histology, Lippincott, Williams, and Wilkins, Phila, PA; Louis, et al. (2002) Basic Histology: Text and Atlas, McGraw-Hill, New York, NY).

[0128] Software packages and databases for determining, e.g., antigenic fragments, leader sequences, protein folding, functional domains, glycosylation sites, and sequence alignments, are available (see, e.g., GenBank, Vector NTI ^® Suite (Informax, Inc, Bethesda, MD); GCG Wisconsin Package (Accelrys, Inc., San Diego, CA); DeCypher ^® (TimeLogic Corp., Crystal Bay, Nevada); Menne et al. (2000) Bioinformatics 16: 741-742; Menne et al. (2000) Bioinformatics Applications Note 16:741-742; Wren et al. (2002) Comput. Methods Programs Biomed. 68:177-181; von Heijne (1983) Eur. J. Biochem. 133:17-21; von Heijne (1986) Nucleic Acids Res. 14:4683-4690).

Example 2

Humanization of Anti-human IL-23pl9 Antibodies

[0129] The humanization of mouse anti-human IL-23pl9 antibodies 6H12 and

7G10, was performed as essentially as described in PCT patent application publications WO 2005/047324 and WO 2005/047326, which are incorporated by reference. [0130] Variable light and heavy domains of selected anti-IL-23 monoclonal antibodies (6H12 and 7G10) were cloned and fused to a human kappa light chain (CL domain) and human IgGl heavy chain (CHl-hinge-CH2-CH3), respectively. [0131] The amino acid sequence of the non-human VH domain was compared to a group of five human VH germline amino acid sequences; one representative from subgroups IGHVl and IGH V4 and three representatives from subgroup IGH V3. The VH subgroups are listed in M.-P. Lefranc, "Nomenclature of the Human Immunoglobulin Heavy (IGH) Genes", Experimental and Clinical Immunogenetics, 18:100-116, 2001. 6H12 and 7G10 antibodies scored highest against human heavy chain germline DP- 14 in subgroup VHl. [0132] For all non-human antibodies, the VL sequences were of the kappa subclass of VL. The amino acid sequence of the non-human VL domain was compared to a group of four human VL kappa germline amino acid sequences. The group of four is comprised of one representative from each of four established human VL subgroups listed in V. Barbie & M.-P. Lefranc, "The Human Immunoglobulin Kappa Variable (IGKV) Genes and Joining (IGKJ) Segments", Experimental and Clinical Immunogenetics, 15:171-183, 1998 and M.- P. Lefranc, "Nomenclature of the Human Immunoglobulin Kappa (IGK) Genes", Experimental and Clinical Immunogenetics, 18 : 161 - 174, 2001. The four subgroups also correspond to the four subgroups listed in Kabat et al. "Sequences of Proteins of

Immunological Interest", U. S. Department of Health and Human Services, NIH Pub. 91- 3242, 5th Ed., 1991, pp. 103-130. 6H12 and 7G10 antibodies scored highest against human light chain germline Z-012 in subgroup VLkI.

[0133] Once the target amino acid sequences of the variable heavy and light chains were determined, plasmids encoding the full-length humanized antibody were generated. Starting with a plasmid encoding a humanized anti-IL-10 antibody having VH3 DP-46 and VLkI Z-012 germline frameworks, the plasmids were altered using Kunkel mutagenesis (see, e.g., Kunkel T A. (1985) Proc. Natl. Acad. ScL U.S.A 82:488-492) to change the DNA sequence to the target humanized 6H12 or 7G10 sequences. Simultaneously, codon optimization was incorporated into the changes to provide for potentially optimal expression. The resulting humanized heavy and light chain sequences, including signal sequences, are provided at SEQ ID NOs: 1 and 2 (antibody 6Hl 2) and at SEQ ID NOs: 3 and 4 (for antibody 7Gl 0), respectively.

[0134] An analogous procedure was performed to determine the proper human frameworks for humanization of antibodies 1OH 11 and 22E9. Antibody 1OH 11 scored highest against human antibody heavy chain germline DP-46 in subgroup VH3 and light chain germline Z-A27 in subgroup VLkIII. Antibody 22E9 scored highest against human antibody heavy chain germline DP- 14 in subgroup VHl and light chain germline Z-B3 in subgroup VLkIV. The resulting humanized heavy and light chain variable domain sequences are provided at SEQ ID NOs: 90 and 91 (antibody 10Hl 1) and at SEQ ID NOs: 92 and 93 (for antibody 22E9), respectively.

Example 3 Determining the Equilibrium Dissociation Constant (K _D ) for Humanized Anti-human IL-23

Using KinExA Technology

[0135] The equilibrium dissociation constant (K _D ) for anti human IL-23 antibodies were determined using the KinExA 3000 instrument (Sapidyne Instruments Inc., www.sapidyne.com ). KinExA uses the principle of the Kinetic Exclusion Assay method based on measuring the concentration of uncomplexed antibody in a mixture of antibody, antigen and antibody-antigen complex. The concentration of free antibody is measured by exposing the mixture to a solid-phase immobilized antigen for a very brief period of time. In practice, this is accomplished by flowing the solution phase antigen-antibody mixture

past antigen-coated particles trapped in a flow cell. Data generated by the instrument are analyzed using custom software. Equilibrium constants are calculated using a mathematical theory based on the following assumptions: [0136] 1. The binding follows the reversible binding equation for equilibrium:

^ _n [Ab] [Ag] = Jc _Of1 [AbAg]

2. Antibody and antigen bind 1:1 and total antibody equals antigen-antibody complex plus free antibody.

3. Instrument signal is linearly related to free antibody concentration.

[0137] 98 micron PMMA particles (Sapidyne, Cat No. 440198) were coated with biotinylated rhIL-23 according to Sapidyne "Protocol for coating PMMA particles with biotinylated ligands having short or nonexistent linker arms". For biotinylation of rhIL-23, EZ-link TFP PEO-biotin (Pierce, Cat. No. 21219) was used according to manufacturer's recommendations (Pierce bulletin 0874). AU experimental procedures were done according to the KinExA 3000 manual.

[0138] Three forms of the heterodimeric IL-23 protein were used. Native or non- linked human IL-23 comprised of two chains, pi 9 and p40, that are covalently linked by a disulfϊde-bond. "Non-linked" IL-23 is comprised of human p40 coexpressed in 293T cells with human pl9:FLAG-tag peptide and purified over an anti-FLAG peptide affinity column. By non-reducing SDS-PAGE the purified non-linked IL-23 showed presence of multimeric IL-23 forms at molecular weights corresponding to dimers, trimers, etc. [0139] "Elastikine" IL-23 is a single-chain peptide comprised of FLAG-tag peptide:GLU-tag peptide:human p40:elasti-linker:human pi 9. The elasti-linker peptide sequence was derived from R&D Systems form of commercial IL-23. Elastikine was expressed in 293T cells and purified over an anti-FLAG peptide affinity column. By non- reducing SDS-PAGE the purified elastikine IL-23 showed presence of multimeric IL-23 forms at molecular weights corresponding to dimers, trimers, etc.

[0140] A non-tagged, non-linked form of native human IL-23pl 9/p40 coexpressed in SF9 cells was purchased from eBioscience (CAT No. 34-8239). By non-reducing SDS-

PAGE the purified eBioscience human IL-23 did not show presence of multimeric IL-23 forms.

[0141] All runs were done in duplicate under the following conditions: Sample volume: 1.5 mL; Sample flow rate: 0.25 mL/min; Label volume: 0.5 mL; Label flow rate:

0.25 mL/min; mAb cone. : 0.1 nM; Highest Ag (hIL-23) cone. : 4.0 nM; Lowest Ag (hlL-

23) cone. : 3.91 pM. Two-fold serial dilutions of the antigen were prepared and mixed with the antibody at constant concentration. The mixture was incubated for 2 hr at room temperature to equilibrate.

[0142] Table 4 shows the results of the KinExA analysis.

Table 4

K _D Values Determined by KinExa

Human IL-23 Antibody K _D (pM)

elastikine 6H12 54, 48 non-linked 6H12 >1200 eBioscience 6H12 >1000, >920 elastikine hu6H12 28, 36 elastikine 7G10 41, 9.2 elastikine hu7G10 49, 16 elastikine 39G2 19 non-linked 39G2 34 eBioscience 39G2 620 elastikine 35F12 53 eBioscience 35F12 >700 elastikine 13B5 22 eBioscience 13B5 55 elastikine 7D7 2.7 elastikine 3D7 0.84 elastikine 49Al 0 7.4 elastikine 13F11 11 elastikine 33B12 6.8

Example 4 Determining the Equilibrium Dissociation Constant (Kp) for Humanized Anti-human IL-

23pl9 Antibodies Using BIAcore Technology

[0143] AU ligands (anti-IL-23 mAbs) were immobilized on a BIAcore CM5 sensor chip using standard amine-coupling procedure. All experiments were carried out at 25 "C and at a flow-rate of 10 μL/min in PBS. AU IL-23 forms were diluted in PBS to produce various concentrations. Kinetic constants for the various interactions were determined using BIAevaluation software 3.1. The Kj) was determined using the calculated dissociation and association rate constants. Proteins were used at the following concentrations: anti-IL-23 mAb hu7G10 in PBS at 0.33 mg/mL; anti-IL-23 mAb hu6H12 in PBS at 0.2 mg/mL; bac-wt human IL-23 in PBS at 0.30 mg/mL; eBioscience human IL-23 in PBS at 0.10 mg/mL; N222Q human IL-23 in PBS at 0.33 mg/mL.

[0144] hi addition to the proteins noted above other forms were also used. "Bac-wt" human IL-23 is identical to "elastikine" human IL-23 in sequence. This IL-23 was expressed in SF9 cells and purified over an anti-FLAG peptide affinity column. By non- reducing SDS-PAGE the purified IL-23 did not show presence of multimeric IL-23 forms. "N222Q" human IL-23 is identical to "elastikine" human IL-23 in sequence except for alteration of Asn222 to GIn in the p40 subunit (GenBank Accession No. P29460). This IL- 23 was expressed in SF9 cells and purified over an anti-FLAG peptide affinity column. By non-reducing SDS-PAGE the purified N222Q IL-23 did not show presence of multimeric IL-23 forms.

[0145] The following immobilization and regeneration conditions were used for all experiments: Flow-rate: 5 μL/min; NHS/EDC: 10 μL; Protein: 5 μg/mL in 10 mM NaAcetate, pH 5.0: 10 μL; ethanolamine: 40 μL; regeneration: 5 μL of 50 mM NaOH. [0146] Table 5 provides the K _D values as determined by BIAcore.

Table 5

Kj) Determination by BIAcore Human IL-23 Antibody Krj(nM)

bac-wt hu7G10 10

N222Q hu7G10 0.3, 1.0 eBioscience hu7G10 3.2, 9.0 bac-wt hu6H12 5.1

N222Q hu6H12 0.5 eBioscience hu6H12 4.1

Example 5

Proliferation Bioassays for the Assessment of Neutralizing Anti-IL-23 Antibodies [0147] The ability of a monoclonal antibody to biologically neutralize IL-23 was assessed by the application of short-term proliferation bioassays that employ cells that express recombinant IL-23 receptors. The transfectant Ba/F3-2.21o cells proliferate in response to human IL-23 and the response can be inhibited by a neutralizing anti-IL-23 antibody. An antibody is titrated against a concentration of IL-23 chosen within the linear region of the dose-response curve, near plateau and above EC50. Proliferation, or lack thereof, is measured by colorimetric means using Alamar Blue, a growth indicator dye based on detection of metabolic activity. The ability of an antibody to neutralize IL-23 is assessed by its IC50 value, or concentration of antibody that induces half-maximal inhibition of IL-23 proliferation.

[0148] IL-23R Transfectant Cell Line and Cell Culture

Cell line IL-23R expression IL-23 response

Ba/F3-2.21o-hIL-23R hIL-23R, hIL-12RBl Human, Cyno

[0149] Ba/F3 transfectants are maintained in RPMI-1640 medium, 10% fetal calf serum, 50 μM 2-mercaptoethanol, 2 mM L-Glutamine, 50 μg/mL penicillin-streptomycin, and 10 ng/mL mouse IL-3. "Cyno" refers to cynomolgus monkey IL-23.

Proliferation Bioassay Medium

[0150] Ba/F3 proliferation bioassays were performed in RPMI-1640 medium, 10% fetal calf serum, 50 uM 2-mercaptoethanol, 2 mM L-Glutamine, and 50 ug/mL penicillin- streptomycin.

Procedure

[0151] Assays were performed in 96-well flat bottom plates (Falcon 3072 or similar). All preparations of reagents and cell suspensions utilized the appropriate bioassay medium. The assay volume was 150 μL per well. Titrations of an anti-IL-23 antibody were pre-incubated with IL-23 for 30-60 min at room temperature, during which time cells were prepared. Cells were added to plates following the antibody-cytokine pre-incubation. Bioassay plates were incubated in a humidified tissue culture chamber (37C, 5% CO ₂ ) for 40-48 hr. At the end of the culture time, Alamar Blue (Biosource Cat #DAL1100) was added at 16.5 μL/well and allowed to develop for 5-12 hours. Absorbance was then read at 570 nm and 600 nm (VERSAmax Microplate Reader, Molecular Probes), and an OD _57O-6O o was obtained. Duplicates were run for each sample.

Cell Preparation

[0152] Cells were used in a healthy growth state, generally at densities of 3-8 x

10 ImL. Cells were counted, pelleted, washed twice in bioassay medium, and suspended to the appropriate density for plating.

IL-23 Dose-Response

[0153] IL-23 was prepared to working concentration (3 ng/mL) and added to first well at 75 μL. Serial dilutions of 1 :3 were made by titrating 25:50 μL in bioassay medium across wells, leaving 50 μL/well. Cells were suspended to the appropriate density for plating at 100 μL per well.

Neutralizing Antibody Dose-Response

[0154] The antibody was prepared to working concentration (30 μg/mL) and added to first well at 75 μL. Serial dilutions of 1 :3 were made by titrating 25:50 μL in bioassay medium across wells, leaving 50 μL per well. IL-23 at the appropriate concentration was added at 50 μL per well to the wells containing the titrated antibody. Cells were suspended to the appropriate density for plating at 50 μL per well, and added following the antibody- cytokine pre-incubation.

IC50 Determination

[0155] Using GraphPad Prism 3.0 software, absorbance is plotted against cytokine or antibody concentration and IC50 values are determined using non-linear regression (curve fit) of sigmoidal dose-response.

[0156] Table 6 shows the IC50 values for blocking of Ba/F3 cell proliferation by anti-IL-23pl9 antibodies

Table 6 IC50 Values for Blocking of Ba/F3 Cell Proliferation by Anti-IL-23 Antibodies

Human IL-23 Antibody IC50(nM)

elastikine 7G10 22, 18 non-linked 7G10 3000 eBioscience 7G10 3100, 510 elastikine hu7G10 29 non-linked hu7G10 10000 eBioscience hu7G10 7800 elastikine 6H12 9, 11 non-linked 6H12 1500 eBioscience 6H12 1300, 500 elastikine hu6H12 27 non-linked hu6H12 4000 eBioscience hu6H12 3200 elastikine 13B5 7, 5 non-linked 13B5 113 eBioscience 13B5 31 elastikine 33B12 4, 3 non-linked 33B12 193 eBioscience 33B12 57 elastikine 39G2 9, 5 non-linked 39G2 67 eBioscience 39G2 11 elastikine 35F12 15, 5 non-linked 35F12 73

eBioscience 35F12 12 elastikine 3D7 3, 3 non-linked 3D7 37 eBioscience 3D7 2

Example 6

Epitope for Anti-IL-23ρl9 Antibody 7G10

[0157] The epitope for the binding of antibody 7G10 to human IL-23pl9 (SEQ ID

NO: 29) was determined by X-ray crystallography. Coordinates were determined for a complex of an Fab fragment of the chimeric form of antibody 7G10 and non-linked human IL-23, which comprises pl9 and p40 subunits. The sequence of human IL-23pl9 is found at SEQ ID NO: 29 and the sequence of the mature form of human IL-12/IL-23 p40 is found at residues 23-328 of GenBank Accession No. P29460. The chimeric form of antibody 7G10 comprises i) a heavy chain comprising the mouse 7G10 VH domain (SEQ ID NO: 6) fused to a human heavy chain constant region (residues 135 - 464 of SEQ ID NO: 3), and ii) a light chain comprising the mouse 7G10 V _L domain (SEQ ID NO: 18) fused to a human light chain constant region (residues 130 - 233 of SEQ ID NO: 4).

[0158] IL-23 amino acid residues within 4.θA of residues on antibody 7G10 include

E82, G86, S87, D88, T91, G92, E93, P94, S95, H106, P133, S134, Q135, P136, W137, Rl 39, L140. Additional residues K83, F90 and Ll 10 were within 5.θA. An amino acid residue on IL-23ρl9 is considered to be within a given distance of the antibody (e.g. 4.θA or 5.θA) if the coordinates of any atom of the residue are within the given distance of the coordinates of any atom of the antibody.

[0159] Most of these contacted residues fall into two main clusters along the primary structure of IL-23pl9, with the first cluster comprising residues 82-95 (in which 11 of 14 residues are within 5.0A of the antibody and 9 of 14 are within 4.0A) and the second cluster comprising residues 133-140 (in which 7 of 8 residues are within 4.θA of the antibody). These clusters define epitopes comprising stretches of 8 or more contiguous amino acid residues of IL-23pl9 in which 50%, 70% and 85% or more of the residues are within 5.θA of the antibody.

[0160] Antibodies binding to either or both of these clusters would be expected to block binding of antibody 7Gl 0. Given the strong sequence homology between all six CDR

sequences (see FIGS. IA - 1C and 2 A — 2C), it is likely that the other antibodies comprising the "(a) light chain subfamily" (6H12, 33B12, 13Fl 1, 13B5, 13Gl, HClO, 7E2, 30Fl 1, 34E4, 6H4, 33D2) will also bind to substantially the same epitope in IL-23pl9 as antibody 7G10. The consensus CDR sequences for the antibodies of the "(a) light chain subfamily" variable domain sequence are provided at SEQ ID NOs: 69, 72 and 75. Corresponding heavy chain variable domain consensus sequences are provided at SEQ ID NOs: 66-68. Antibodies binding to the same epitope as antibody 7G10 would be expected to exhibit similar biological activities, such as blocking Ba/F3 cell proliferation in the assay described at Example 5 and Table 6, albeit with perhaps somewhat variable affinities and IC50s.

[0161] Table 7 provides a brief description of the sequences in the sequence listing.

Table 7 Sequence Identifiers

[0162] Many modifications and variations of this invention can be made without departing from its spirit and scope, as will be apparent to those skilled in the art. The specific embodiments described herein are offered by way of example only, and the invention is to be limited by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled; and the invention is not to be limited by the specific embodiments that have been presented herein by way of example. [0163] Citation of the above publications or documents is not intended as an admission that any of the foregoing is pertinent prior art, nor does it constitute any admission as to the contents or date of these publications or documents. U.S. patents and other publications referenced herein are hereby incorporated by reference.