BACKGROUND OF THE INVENTION The hypothalamus plays a key role in the regulation of adenohypophysial corticotropic cells secretory functions. Factors in hypothalamus increase the rate of ACTH secretion by the pituitary gland. A physiologic corticotropin releasing factor (CRF), i.e., ovine CRF (oCRF) , was characterized in 1981 and disclosed in U.S. Patent No. 4,415,558 to have the formula:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu - Leu-Arg-Glu-Val-Leu-Glu-Met-Thr-Lys-Ala-Asp-Gln-Leu-Ala- Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Asp-Ile-Ala-NH,. Rat CRF(rCRF) has been characterized as having the formula: H-Ser-Glu-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu- Thr-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala- Glu-Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met- Glu-Ile-Ile-NH ₂ and may alternatively be referred to as rat Amunine. The formula of human CRF has apparently been determined to be the same as that of rCRF. Synthetic rCRF and oCRF stimulate ACTH and β-endorphin activites jLri vitro and iτι vivo and substantially lower blood pressure for an extended time period.

SUMMARY OF THE INVENTION Analogs of these 41-residue CRF peptides, having the following formula and depending upon the composition of Q, have at least substantially the same biological activity in the foregoing respects as the native peptides or are competitive antagonists of the natural peptides: Y-Q-leu-R, ,-R, ₂ -R, ₃ -leu-leu-

rg-R ₁₇ -R ₁₈ -R ₁₉ -Glu-R ₂₁ - ₂₂ -R ₂₃ -R ₂₄ -R ₂₅ -

^•R 26~ ^R 27~ ^R 28~ ^R 29~ ^Gln ~ ^ala ~ ^R 32~ ^R 33~ ^Asn ~ ^Arg ~

^R 36 ^'R 37 ^"R 38 ^"R 39 ^"R 40 ^"R 4l ^'NH 2 ^{wherein Y is} an acyl group having 7 or less carbon atoms or hydrogen; Q is R,-R ₂ -R ₃ -R ₄ -R--Ile-Ser-Rg-R _g or

Rg-R- or Rg or R _g or desQ; R, is Ser, D-Ser or des R, ; R ₂ is Gin, pGlu, Glu, D-pGlu or des R ₂ ;

R ₃ is Glu, Gly, D-Tyr or des R ₃ ; R- is Pro, D-Pro or des R.; R _ς is Pro or desR-; R„, R,,, R, _g and R ₂₄ are selected from the group consisting of leu, lie, ala, Gly, Val, Nle, Phe and Gin; R _g is Asp or Glu; R_. is Thr or Ser; R- ₃ is His, Tyr or Glu; R._ is Glu or Lys; R- ₈ is Val, Nle or Met; R ₂ - is Met, Nva, He, ala, leu, Nle, Val, Phe or Gin; R ₂₂ is ala, Thr, Asp or Glu; R ₂₃ is Arg, Orn, Har or Lys; R _2g is Asp or Glu; R _2g is Gin, Asn or Lys; R ₂ _ is leu. He, ala, Val, Nva, Met, Nle, Phe, Asp, Asn, Gin or Glu; R ₂₈ is ala, Arg or Lys; R _2g is Gin or Glu, R ₃₂ is His, Gly, Tyr or ala; R ₃₃ is Ser, Asn, leu, Thr or ala; R _3g is Lys, Orn, Arg, Har or Leu; R ₃ _ is leu or Tyr; ₃₈ is Met or leu; R., _g is Glu or Asp; R. _Q is He, Thr, Glu, ala, Val, leu, Nle, Phe, Nva, Gly or Gin; R., is ala. He, Gly, Val, Leu, Nle, Phe, Gin or des R., ; provided however that when Q contains -He-Ser-at least one of the following occurs: R ₃ is D-Tyr, R. is D-Pro, R ₂₈ is Arg, R _2g is Glu, R ₃₆ is either Arg or Har, R ₃₇ is Tyr or R. _Q is Glu; or a nontoxic addition salt thereof.

Pharmaceutical compositions in accordance with the invention include such CRF analogs, or nontoxic addition salts thereof, dispersed in a pharmaceutically or veterinarily acceptable liquid or solid carrier. The administration of such peptides or pharmaceutically or veterinarily acceptable addition salts thereof to mammals, particularly humans, in accordance with the invention may be carried out for the regulation of secretion of ACTH, β-endorphin, β-lipotropin, other products of the pro-opiomelanocortin gene and corti-

costerone and/or for the lowering of blood pressure and/or for affecting mood, behavioral and gastro¬ intestinal functions and autonomic nervous system activities. Furthermore CRF analogs may be used for the evaluation of the status of pituitary, cardiovascular, gastrointestinal or central nervous system functions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The nomenclature used to define the peptides is that specified by Schroder & Lubke, "The Peptides", Academic Press (1965) wherein, in accordance with conventional representation, the amino group appears to the left and the carboxyl group to the right. The standard 3-letter abbreviations to identify the alpha-amino acid residues, and where the amino acid residue has isomeriσ forms, it is the L-form of the amino acid that is represented unless otherwise expressly indicated, e.g. Ser = L-serine, Nle = L-norleucine, Nva - norvaline, Har = homoarginine, Orn = ornithine etc. In addition the following abbreviations are used: leu = either L-leucine or (_^CH ₃ -L-leucine

(CML) and ala = either L-alanine or C ⁰⁽ CH ₃ -L-alanine(CMA) .

The invention provides analogs of CRF having the following Formula (I) : Y-Q-leu-R,,-R, ₂ ~R, ₃ - leu-leu-Arg-R ₁₇ -R ₁₈ -R, _g -Glu-R ₂ , -R ₂₂ -R ₂₃ - R ₂₄ -R ₂₅ -R ₂₆ -R ₂₇ -R ₂₈ -R _2g -Gln-ala-R ₃₂ -R ₃₃ - Asn-Arg-R ₃₆ -R ₃₇ -R ₃₈ -R _3g -R ₄₀ -R ₄₁ -NH ₂ wherein Y is an acyl group having 7 or less carbon atoms or hydrogen; Q is R,-R ₂ -R ₃ -R ₄ -R ₅ -Ile-Ser-R ₈ - R _g or -R ₈ -R _Q or R _g or R _g or desQ; R, is Ser, D-Ser or des R,; R ₂ is Gin, pGlu, Glu, D-pGlu or des R ₂ ; R ₃ is Glu, Gly, D-Tyr or des R ₃ ; R ₄ is Pro, D-Pro or des R ₄ ; R- is Pro or desR ₅ ; R _g , R ₁₂ ' R. _q and R ₂₄ are selected from the group consisting of leu. He, ala, Gly, Val, Nle, Phe and Gin; R _g is Asp or Glu; R,, is Thr or Ser; R, ₃ is His, Tyr or Glu; R, ₇ is Glu or Lys; R, _Q is Val, Nle or Met;

R ₂₁ is Met, Nva, He, ala, leu, Nle, Val, Phe or Gin; R ₂₂ is ala, Thr, Asp or Glu; R ₂₃ is Arg, Orn, Har or Lys; R ₂ _ is Asp or Glu; R _2g is Gin, Asn or Lys; R ₂₇ is leu. He, ala, Val, Nva, Met, Nle, Phe, Asp, Asn, Gin or Glu; R ₂₈ _ is ala, Arg or Lys; R _2g is Gin or Glu, R ₃₂ is His, Gly, Tyr or ala; R ₃₃ is Ser, Asn, leu, Thr or ala; R _3g is Lys, Orn, Arg, Har or Leu; R ₃₇ is leu or Tyr; R ₃₈ is Met or leu; R _3g is Glu or Asp; R _4Q is He, Thr, Glu, ala, Val, leu, Nle, Phe, Nva, Gly or Gin; R ₄₁ is ala. He, Gly, Val, Leu, Nle, Phe, Gin or des R ₄ , . However, in this formula, at least one and preferably at least two of the following substituents are present: R ₃ is D-Tyr, R ₄ is D-Pro, R ₂₈ is Arg, R _2g and/or R _4Q is Glu, R _3g is either Arg or Har and R ₃₇ is Tyr. Most preferably, at least one of these two substituents is the residue Glu in the 29- or 40-position.

CRF agonists have been synthesized which are at least as potent as and often more potent than native CRF. These analogs preferably include the following residues having a high alpha-helical forming potential: R, is Ser, R ₂ is Gin or Glu, R ₃ is Glu, R ₄ and R- are Pro, Rg is leu, R,, is Thr, R, ₂ is Phe or leu, R, ₃ is His or Glu, R, ₇ is Glu, R, ₈ and R ₂ , are Met or Nle, R. _g and R ₃₇ are leu, R ₂₂ and R ₄ _ are ala, R ₂₃ is Lys, R ₂₄ and R ₂₈ are ala, R _2g and R _3g are Glu, R _2g is Gin, R ₂₇ is Glu or leu,

R _2g is Glu, R ₃₂ is His or ala, R ₃₃ is Ser or leu,

R,38 ₀ is Leu and R4. _n 0 is He or Glu. One analog ³ which has been found to be particularly potent is:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu- Ala-NH ₂ and is hereinafter referred to as AHC (for alpha-helical CRF) ; it remains potent even if shortened at the N-terminus by from one to five residues. However, if shortened to eliminate residues 1 to 7, 1 to 8 or 1 to 9, competitive antagonists of CRF are formed.

The peptides are synthesized by a suitable method, such as by exclusively solid-phase techniques, by partial solid-phase techniques, by fragment condensation or by classical solution addition. Certain CRF analogs which do not include D-isomer residues or unnatural amino acid residues may also be synthesized by recently developed recombinant DNA techniques.

Synthesis by the use of recombinant DNA techniques, for purposes of this application, should be understood to include the suitable employment of a structural gene coding for the desired form of CRF analog. The synthetic CRF peptide may be obtained by transforming a microorganism using an expression vector including a promoter and operator together with such structural gene and causing such transformed microorganism to express the CRF peptide. A non-human animal may also be used to produce the CRF peptide by gene-farming using such a structural gene and the general techniques set forth in U.S. Patent No. 4,276,282 issued June 30, 1981 or using microinjection of embryos as described in W083/01783 published 26 May 1983 and 082/04443 published 23 December 1982. The synthetic CRF peptide is then suitably recovered from the animal by extraction from sera or the like. Common to chemical syntheses of peptides is the protection of the labile side chain groups of the various amino acid moieties with suitable protecting groups which.will prevent a chemical reaction from occurring at that site until the group is ultimately removed. Usually also common is the protection of an alpha-amino group on an amino acid or a fragment while that entity reacts at the carboxyl group, followed by the selective removal of the alpha-amino protecting group to allow subsequent reaction to take place at that location. Accordingly, it is common that, as a step in the synthesis, an intermediate compound is produced which includes each of the amino acid residues located

in its desired sequence in the peptide chain- with various of these residues having side-chain protecting groups.

Also considered to be within the scope of the

thereof which are shortened at the N-terminus as set forth hereinbefore, wherein: the R-groups are as hereinbefore defined.

X is either hydrogen or an -- -amino protecting group. The e<-amino protecting groups contemplated by X are those known to be useful in the art in the step-wise synthesis of polypeptides. Among the classes of c-amino protecting groups covered by X are (1) acyl-type protecting groups, such as formyl, acrylyl(Acr) , benzoyl(Bz) and acetyl(Ac) which are preferably used only at the N-terminal; (2) aromatic urethan-type protecting groups, such as benzyloxycarbonyl(Z) and substituted Z, such as p-chlorobenzyloxycarbonyl, p-nitrobenzyloxycarbonyl, p-bromobenzyloxycarbonyl, p-methoxybenzyloxycarbonyl;

(3) aliphatic urethan protecting groups, such as t-butyloxycarbonyl (BOC) , diisopropylmethoxycarbonyl, isopropyloxycarbonyl, ethoxycarbonyl, allyloxycarbonyl;

(4) cyσloalkyl urethan-type protecting groups, such as fluorenylmethyloxycarbonyl(FMOC) , cyclopentyloxycarbonyl, adamantyloxycarbonyl,and cyclohexyloxycarbonyl; and (5) thiourethan-type protecting groups, such as phenylthiocarbonyl. The preferred o(-amino protecting group is BOC.

2 X is a protecting group for the hydroxyl group of Thr and Ser and is preferably selected from the class consisting of acetyl(Ac), benzoyl(Bz), tert-butyl, triphenylmethyl(trityl) , tetrahydropyranyl, benzyl ether(Bzl) and 2,6-dichlorobenzyl (DCB) . The most

2 preferred protecting group is Bzl. X can be hydrogen, which means there is no protecting group on the hydroxyl group. 3 X is a protecting group for the gύanidino group of Arg or Har preferably selected from the class consisting of nitro, p-toluenesulfonyl(Tos) , Z, adamantyloxycarbonyl and BOC, or is hydrogen. Tos is most preferred. 4 X is hydrogen or a protecting group, preferably xanthyl(Xan) , for the amido group of Asn or

Gin.

5 X is hydrogen or an ester-formmg protecting group for the β- or JT-carboxyl group of Asp or Glu, preferably selected from the class consisting of benzyl, 2,6-dichlorobenzyl, methyl, ethyl and t-butyl ester. OBzl is most preferred.

X is hydrogen or a protecting group for the side chain amino substituent of Lys or Orn. Illustrative of suitable side chain amino protecting groups are Z, 2-chlorobenzyloxycarbonyl(2-Cl-Z) , Tos, t-amyloxyσarbonyl(Aoc) , BOC and aromatic or aliphatic urethan-type protecting groups as specified hereinbefore.

When His is present, X is hydrogen or a protecting group for the imidazole nitrogen such. as Tos or 2,4-dinitrophenyl(DNP) , and when Tyr is present, X is hydrogen or a protecting group for the hydroxyl group such as DCB. When Met is present, the sulfur may be protected, if desired, with oxygen.

The selection of a side chain amino protecting group is not critical except that it should must be one which is not removed during deproteσtion of the o-amino groups during the synthesis. Hence, thec -amino

protecting group and the side chain amino protecting group cannot be the same. 7 X is NH ₂ , a protecting group such as an ester or an anchoring bond used in solid phase synthesis for linking to a solid resin support, preferably one represented by the formulae:

-NH-benzhydrylamine (BHA) resin support and

-NH-paramethylbenzhydrylamine (MBHA) resin support.

Cleavage from a BHA or MBHA resin directly gives the CRF analog amide. By employing a methyl-derivative of such a resin, a methyl-substituted amide can be created.

In the formula for the intermediate, at least one of X, X ¹ , X ² , X ³ , X ⁴ , X ⁵ and X ⁶ is a protecting group. The particular amino acid chosen for each the R-group determines whether there will also be a protecting group attached as specified hereinbefore and as generally known in the art. In selecting a particular side chain protecting group to be used in the synthesis of the peptides, the following rules are followed: (a) the protecting group should be stable to the reagent and under the reaction conditions selected for removing the *X-amino protecting group at each step of the synthesis, (b) the protecting group should retain its protecting properties and not be split off under coupling conditions and (c) the side chain protecting group must be removable, upon the completion of the synthesis containing the desired amino acid sequence, under reaction conditions that will not alter the peptide chain. For the acyl group at the N-terminal represented by Y, acetyl, formyl, acrylyl and benzoyl are preferred. For the 1 to 10 amino acid peptide which may be optionally included without adversely affecting the potency, any amino acids may be used, but the L- or D- forms of the naturally accurring amino acids would normally be used.

Thus, the present invention is also considered to provide a process for the manufacture of compounds defined by the Formula (I) comprising (a) forming a peptide having at least one protecting group and having the Formula (II) wherein: X, X ¹ , X ² , X ³ , X ⁴ ,

5 6

X and X are each either hydrogen or a protecting

7 group, and X is either a protecting group or an anchoring bond to resin support or H ₂ and (b) splitting off the protective group or groups or anchoring bond from said peptide of the Formula (II) and

(c) if desired, converting a resulting peptide into a nontoxic addition salt thereof.

When the peptides are prepared by chemical synthesis, they are preferably prepared using solid phase synthesis, such as that described by Merrifield,

J. Am. Che . Soc, 85, p 2149 (1964), although other equivalent chemical syntheses known in the art can also be used as previously mentioned. Solid-phase synthesis is commenced from the C-terminal end of the peptide by coupling a protected tX-amino acid to a suitable resin as generally set forth in U.S. Patent No. 4,244,946 issued

Jan. 21, 1981 to Rivier et al., the disclosure of which is incorporated herein by reference. Such a starting material for rCRF analogs can be prepared by attaching o(-amino-protected He to a BHA resin.

He protected by BOC is coupled to the BHA resin using methylene chloride and dimethylformamide

(DMF) . Following the coupling of BOC-Ile to the resin support, the 0-amino protecting group is removed, as by using trifluoroacetic acid(TFA) in methylene chloride,

TFA alone or with HC1 in dioxane. Preferably 50 volume

% TFA in methylene chloride is used with 0-5 weight %

1,2 ethanedithiol. The deprotection is carried out at a temperature between about 0°C and room temperature. other standard cleaving reagents and conditions for removal of specific ( -amino protecting groups may be used as described in Schroder & Lubke, "The Peptides", 1 pp 72-75 (Academic Press 1965).

After removal of the 06-amino protecting group of He, the remaining c(-amino- and side chain-protected amino acids are coupled step-wise in the desired order to obtain the intermediate compound defined hereinbefore. As an alternative to adding each amino acid separately in the synthesis, some of them may be coupled to one another prior to addition to the solid phase reactor. The selection of an appropriate coupling reagent is within the skill of the art. Particularly suitable as coupling reagents are N,N'-dicyclohexyl carbodiimide(DCCI) and N,N'-diisopropyl carbodiimide(DICI) .

The activating reagents used in the solid phase synthesis of the peptides are well known in the peptide art. Examples of suitable activating reagents are carbodiimides, such as N,N*-diisopropyl carbodiimide and N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide. Other activating reagents and their use in peptide coupling are described by Schroder & Lubke, supra, in Chapter III and by Kapoor, J. Phar. Sci., 59, pp 1-27 (1970). Each protected amino acid or amino acid sequence is introduced into the solid phase reactor in about a fourfold excess, and the coupling is carried out in a medium of dimethylformamide(DMF) :CH ₂ C1 ₂ (1:1) or in DMF or CH ₂ C1 ₂ alone. In instances where the coupling is carried out manually, the success of the coupling reaction at each stage of the synthesis is monitored by the ninhydrin reaction, as described by E. Kaiser et al.. Anal. Biochem. 34, 595 (1970). In cases where incomplete coupling occurs, the coupling procedure is repeated before removal of the o-amino protecting group prior to the coupling of the next amino acid. The coupling reactions can be performed automatically, as on a Beck an 990 automatic synthesizer, using a program such as that reported in Rivier et al., Biopolymers, 1978, 17, pp.1927-1938.

After the desired amino acid sequence has been completed, the intermediate peptide is removed from the resin support by treatment with a reagent, such as liquid hydrogen fluoride, which not only cleaves the peptide from the resin but also cleaves all remaining

2 3 4 5 side chain protecting groups X , X , X , X and

X and the o<-amino protecting group X (unless it is an acyl group which is intended to be present in the final peptide),.to obtain the peptide. When using hydrogen fluoride for cleaving, anisole or cresole and methylethyl sulfide are included in the reaction vessel as scavengers. When Met is present in the sequence, the BOC protecting group may be cleaved with trifluoroacetic acid(TFA)/ethanedithiol prior to cleaving the peptide from the resin to eliminate S-alkylation.

The following Example sets forth the preferred method for synthesizing CRF analogs by the solid-phase technique.

EXAMPLE I The synthesis of [Glu 29j-rCRF having the formula: H-Ser-Glu-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-

Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-

Gln-Leu-Ala-Glu-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-

Ile-Ile-NH ₂ is conducted in a stepwise manner on a MBHA hydrochloride resin, such as available from Baσhem, Inc., having a substitution range of about 0.1 to 0.5 mmoles/gm. resin.

The synthesis is performed on an automatic Beckman 990B peptide synthesizer using a suitable program, preferably as follows:

STEP REAGENTS AND OPERATIONS MIX TIMES MIN.

1 CH ₂ C1 ₂ wash-80 ml. (2 times) 3

2 Methanol(MeOH) wash-30 ml. (2 times) 3

3 CH ₂ C1 ₂ wash-80 ml. (3 times) 3 4 50 percent TFA plus 5 percent 1,2-ethane- dithiol in CH ₂ Cl ₂ -70 ml. (2 times) 12

5 Isopropanol wash-80 ml. (2 times) 3

6 TEA 12.5 percent in CH ₂ Cl ₂ -70 ml.

(2 times) 5 7 . MeOH wash-40 ml. (2 times) 2

8 CH ₂ C1 ₂ wash-80 ml. (3 times) 3

9 Boc-amino acid (10 mmoles) in 30 ml. of either DMF or CH ₂ C1 ₂ , depending upon the solubility of the particular protected amino acid, (1 time) plus DCCI (10 mmoles) in CH ₂ C1 ₂ 30-300

Coupling of BOC-Ile results in the substitution of about 0.35 mmol. He per gram of resin. All solvents that are used are carefully degassed, preferably by sparging with an inert gas, e.g. helium or nitrogen, to insure the absence of oxygen that might undesirably oxidize the sulfur of the Met residue.

After deprotection and neutralization, the peptide chain is built step-by-step on the resin. Generally, one to two mmol. of BOC-protected amino acid in methylene chloride is used per gram of resin, plus one equivalent of 2 molar DCCI in methylene chloride, for two hours. When BOC-Arg(Tos) is being coupled, a mixture of 50% DMF and methylene chloride is used. Bzl is used as the hydroxyl side-chain protecting group for Ser and Thr. P-nitrophenyl ester(ONp) is used to activate the carboxyl end of Asn or Gin, and for example, BOC-Asn(ONp) is coupled overnight using one equivalent of HOBt in a 50% mixture of DMF and methylene chloride. The amido group of Asn or Gin is protected by xan when DCCI coupling is used instead of the active ester method. 2-C1-Z is used as the protecting group for the Lys side chain. Tos is used to protect the

guanidino group of Arg and the imidazole group of His, and the side chain carboxyl group of Glu or Asp is protected by OBzl. At the end of the synthesis, the following composition is obtained BOC-Ser (Bzl)-Glu(OBzl)- Glu(OBzl)-Pro-Pro-Ile-Ser(Bzl)-Leu-Asp(OBzl)-Leu-Thr (Bzl)- Phe-His(Tos)-Leu-Leu-Arg(Tos)-Glu(OBzl)-Val-Leu-Glu(OBzl)- Met-Ala-Arg(Tos)-Ala-Glu(OBzl)-Gin(Xan)-Leu-Ala-Glu(OBzl)- Gin(Xan)-Ala-His(Tos)-Ser(Bzl)-Asn(Xan)-Arg(Tos)-Lys (2-Cl-Z)-Leu-Met-Glu(OBzl)-Ile-He-resin support. Xan may have been partially or totally removed by TFA treatment used to deblock the 0<-amino protecting group. In order to cleave and deproteσt the resulting protected peptide-resin, it is treated with 1.5 ml. anisole, 0.5 ml. of methylethylsulfide and 15 ml. hydrogen fluoride (HF) per gram of peptide-resin, first at -20°C. for 20 min. and then at 0.°C. for one-half hour. After elimination of the HF under high vacuum, the resin-peptide is washed alternately with dry diethyl ether and chloroform, and the peptides are then extracted with de-gassed 2N aqueous acetic acid and separated from the resin by filtration.

The peptide is purified by gel permeation followed by semi-preparative HPLC as described in Rivier et al., Peptides: Structure and Biological Function (1979) pp. 125-128, and Rivier et al., J. Chromatography (1983) . The σhromatographiσ fractions are carefully monitored by HPLC, and only the fractions showing substantial purity were pooled.

To check whether the precise sequence was achieved, the rCRF analog was hydrolyzed in sealed evacuated tubes containing constant boiling HC1, 3ul of thioglycol/ml. and 1 nmol of Nle (as an internal standard) for 9 hours at 140 ^β C. Amino acid analyses of the hydrolysates using a Beσk an 121 MB amino acid analyzer showed the following amino acid ratios: Asx(1.9), Thr(0.8), Ser(3.1), Glx(9.0), Pro(2.1) _r Ala(3.8), Val(0.9), Met(1.9), He(2.6), Leu(7.0),

Phe(0.9), Lys(l.O), His(2.0) and Arg(3.0), which confirmed that the 41-residue peptide structure had been obtained.

EXAMPLE II The synthetic peptide AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized using a procedure generally as set forth in Example I.

Specific optical rotation of the rCRF peptide, which was synthesized and purified in the foregoing manner, was measured on a Perkin Elmer Model 141 as [ ] ²² ° - ^***• -24.2° + 1.0 (c=l in 1% acetic acid) (with correction for the presence of H ₂ 0 and TFA) and had a purity of about 95%.

EXAMPLE HI The synthetic peptide AHC and oCRF were examined for their effects on the secretion of ACTH and β-endorphin in vitro and was also in vivo. The potency of synthetic oCRF to stimulate the secretion of ACTH and β-endorphin by cultured rat pituitary cells was measured using the procedure as generally set forth in Endocrinolog , 91, 562 (1972) . Half-maximal responses were observed at about 65 picomolar concentrations of the peptide AHC, while synthetic oCRF concentrations of about 250 picomolar were needed to achieve this response. The secretory response to maximal (1-5 nM) concentrations of AHC is at a plateau level. Ill vivo testing is carried out using the general procedure set forth in C. Rivier et al., Science, 218, 377 (1982).

EXAMPLE IV The peptide [Acetyl-Gly ¹ , Leu ³³ , Glu ⁴⁰ ]- rCRF having the formula:

Ac-Gly-Glu-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu- Ala-Gln-Gln-Ala-His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Glu-He- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE V

The peptide [des Ser ¹ -Glu ² -Glu ³ , Leu ³³ , Glu 40]-rCRF having the formula:

H-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu- Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln-Ala-

His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE VI The peptide [Tyr-Ser 1, Glu29]-rCRF having the formula:

H-Tyr-Ser-Glu-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu- Ala-Glu-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Ile-He- H ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE VII The peptide [Thr ²² , Glu ^29,40 ]-rCRF having the formula:

H-Ser-Glu-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu - Leu-Arg-Glu-Val-Leu-Glu-Met-Thr-Arg-Ala-Glu-Gln-Leu-Ala- Glu-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE VIII The peptide [Acrylyl-Leu-Gly-Val ¹ , Ser ² , Glu ⁴⁰ ]-rCRF having the formula:

Acr-Leu-Gly-Val-Ser-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr- Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu- Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu- Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE IX The peptide [Glu ⁹ , Nle ²¹ , Glu ²⁹ , Leu ³³ ]-rCRF having the formula: H-Ser-Glu-Glu-Pro-Pro-He-Ser-Leu-Glu-Leu-Thr-Phe-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Leu-Ala- Glu-Gln-Ala-His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure to a greater extent than rCRF.

EXAMPLE X The peptide [Nle ⁸ , Ser ¹¹ , Leu ³³ , Glu ⁴⁰ ]-rCRF having the formula:

H-Ser-Glu-Glu-Pro-Pro-He-Ser-Nle-Asp-Leu-Ser-Phe-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala- Gln-Gln-Ala-His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XI

The peptide [Nle ²¹ , Har ²³ , Leu ³³ , Glu ⁴⁰ , Nle 41]-rCRF having the formula:

H-Ser-Glu-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Nle-Ala-Har-Ala-Glu-Gln-Leu-Ala-

Gln-Gln-Ala-His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Glu-Nle-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XII The peptide [Benzoyl-Gly 1, des Gin3,

Nle ¹² , Glu ²⁹ , Arg ³⁶ ]-rCRF having the formula:

Bz-Gly-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Nle-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala- Glu-Gln-Ala-His-Ser-Asn-Arg-Arg-Leu-Met-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XIII The peptide [Acetyl-Pro , Glu ' , Tyr ^J/ ]- rCRF(4-41) having the formula:

Ac-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Glu-Gln- Ala-His-Ser-Asn-Arg-Lys-Tyr-Met-Glu-Glu-He-NH ₂ is synthesized. Testing in accordance with the general

procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure to a greater extent than rCRF. EXAMPLE XIV

The peptide [Gin ² , Orn ²³ , Glu ²⁹ , Leu ³⁸ ]-rCRF having the formula:

H-Ser-Gln-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Ehe-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Orn-Ala-Glu-Gln-Leu-Ala- Glu-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure. EXAMPLE XV

The peptide [Nle ²¹ , Tyr ³² , Leu ³³ , Glu ⁴⁰ ]-rCRF having the formula:

H-Ser-Glu-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu - Leu-Arg-Glu-Val-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Leu-Ala- Gln-Gln-Ala-Tyr-Leu-Asn-Arg-Lys-Leu-Met-Glu-Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure to a greater extent than rCRF.

EXAMPLE XVI

The peptide [des pGl^-Gly ² , Ala ²¹ , Glu 28, Met37]-sauvagine having the formula:

H-Pro-Pro-Ile-Ser-Ile-Asp-Leu-Ser-Leu-Glu-Leu-Leu-Arg- Lys-Met-Ile-Glu-He-Ala-Lys-Gln-Glu-Lys-Glu-Lys-Glu-Gln-

Ala-Ala-Asn-Asn-Arg-Leu-Leu-Met-Asp-Thr-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XVII

The peptide [Ala ²⁰ , Arg ²¹ , Glu ²⁸ , He 39'40]-sauvagine having the formula: pGlu-Gly-Pro-Pro-Ile-Ser-He-Asp-Leu-Ser-Leu-Glu-Leu-Leu-

Arg-Lys-Met-He-Glu-Ala-Arg-Lys-Gln-Glu-Lys-Glu-Lys-Glu- Gln-Ala-Ala-Asn-Asn-Arg-Leu-Leu-Leu-Asρ-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure. EXAMPLE XVIII

The peptide [Leu ²⁶ , Har ³⁵ , Met ³⁷ , Glu 39]-sauvagme having the formula: pGlu-Gly-Pro-Pro-Ile-Ser-He-Asp-Leu-Ser-Leu-Glu-Leu-Leu-

Arg-Lys-Met-Ile-Glu-He-Glu-Lys-Gln-Glu-Lys-Leu-Lys-Gln- Gln-Ala-Ala-Asn-Asn-Arg-Har-Leu-Met-Asp-Glu-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure. EXAMPLE XIX

The peptide [Glu ⁹ , Nle ¹⁸ ' ²¹ ]-AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Glu-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XX The peptide [Nle ¹⁸ ' ²¹ ]-AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXI The peptide [D-Pro ⁴ , Nle ¹⁸ ' ²¹ ]-AHC having the formula:

H-Ser-Gln-Glu-D-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXII The peptide [D-Tyr ³ , D-Pro ⁴ , Nle ¹⁸ ' ²¹ ]-AHC having the formula:

H-Ser-Gln-D-Tyr-D-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His - Leu-Leu-Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXIII

The peptide [Glu ² ' ¹³ ' ²² , Leu ¹² , Orn ²³ , Lys 261-AHC having the formula:

H-Ser-Glu-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Leu-Glu- Leu-Leu-Arg-Glu-Met-Leu-Glu-Met-Glu-Orn-Ala-Glu-Lys-Glu-

Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- H ₂ . Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXIV The synthetic peptide [Ala 13j-AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-Ala- Leu-Leu-Arg-Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXV The peptide [Leu ¹² , Glu ¹³ , Tyr ³⁷ ]-AHC having the formula: H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Leu-Glu- Leu-Leu-Arg-Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Tyr-Leu-Glu-Glu-Ala- NH-. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXVI The peptide _[C ML ¹⁰ ' ¹⁴ ' ¹⁹ ' ²⁷ ' ³³ ' ³⁸ , Har ³⁶ ]-AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-He-Ser-Leu-Asp-CML-Thr-Phe-His- CML-Leu-Arg-Glu-Met-CML-Glu-Met-Ala-Lys-Ala-Glu-Gln-CML- Ala-Glu-Gln-Ala-Ala-CML-Asn-Arg-Har-Leu-CML-Glu-Glu-Ala- NH ₂ . Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI ^" and causes a very significant lowering of blood pressure.

EXAMPLE XXVII The peptide [CML ¹⁰ ' ¹⁵ ' ²⁷ ' ³⁷ ,CMA ²² ' ³² ' ⁴¹ ]-AHC having the formula:

H-Ser-Gln-Glu-Pro-Pro-He-Ser-Leu-Asp-CML-Thr-Phe-His- Leu-CML-Arg-Glu-Met-Leu-Glu-Met-CMA-Lys-Ala-Glu-Gln-CML- Ala-Glu-Gln-Ala-CMA-Leu-Asn-Arg-Leu-CML-Leu-Glu-Glu-CMA- NH ₂ . Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXVIII The peptide [D-Tyr ³ , D-Pro ⁴ , Nle ¹⁸ ' ²¹ ]-AHC(3-41) having the formula: H-D-Tyr-D-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu- Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-

Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it stimulates the secretion of ACTH and β-END-LI to an amount equal to about 470% of oCRF and also causes a very significant lowering of blood pressure.

EXAMPLE XXIX The peptide [D-Pro ⁴ , Nle ¹⁸ ' ²¹ ]-AHC(4-41) having the formula:

H-D-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln- Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it stimulates the secretion of ACTH and β-END-LI to an amount equal to about 160% of oCRF and also causes a very significant lowering of blood pressure.

EXAMPLE XXX The peptide [Glu ²² , Leu ¹² , Orn ²³ , Har ³⁶ ]-AHC(4-41) having the formula: H-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Leu-His-Leu-Leu-Arg- Glu-Met-Leu-Glu-Met-Glu-Orn-Ala-Glu-Gln-Glu-Ala-Glu-Gln- Ala-Ala-Leu-Asn-Arg-Har-Leu-Leu-Glu-Glu-Ala-NH ₂ . Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXI The peptide [Arg ²³ ' ³⁶ ]-oCRF having the formula: H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu- Leu-Arg-Glu-Val-Leu-Glu-Met-Thr-Arg-Ala-Asp-Gln-Leu-Ala- Gln-Gln-Ala-His-Ser-Asn-Arg-Arg-Leu-Leu-Asp-He-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it stimulates the secretion of ACTH and β-END-LI to an amount equal to about 370% of oCRF and also causes a very significant lowering of blood pressure.

EXAMPLE XXXII The peptide [Nle ²¹ ,Glu ²⁹ ]-oCRF having the formula:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu - Leu-Arg-Glu-Val-Leu-Glu-Nle-Thr-Lys-Ala-Asp-Gln-Leu-Ala- Glu-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Asp-He-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXIII The peptide [Nle ¹⁸ ' ²¹ ,Arg ²⁸ ]-oCRF having the formula:

H-Ser-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu - Leu-Arg-Glu-Nle-Leu-Glu-Nle-Thr-Lys-Ala-Asp-Gln-Leu-Arg- Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Asp-He-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXIV The peptide [D-Pro ,Asp"]-oCRF(4-41) having the formula:

H-D-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu- Val-Leu-Glu-Met-Asp-Lys-Ala-Asp-Gln-Leu-Ala-Gln-Gln-Ala- His-Ser-Asn-Arg-Lys-Leu-Leu-Asp-He-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXV The peptide [D-Tyr ³ ,CML ³³ ] -oCRF (3-41) having the formula:

H-D-Tyr-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Ar g-Glu-Val-Leu-Glu-Met-Thr-Lys-Ala-Asp-Gln-Leu-Ala-

Gln-Gln-Ala-His-CML-Asn-Arg-Lys-Leu-Leu-Asp-He-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood ^* pressure.

EXAMPLE XXXVI The peptide [Nle ¹⁸ ,Tyr ³⁷ ,Glu ⁴⁰ ]-oCRF(2-41) having the formula:

H-Gln-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu- Leu-Arg-Glu-Nle-Leu-Glu-Met-Thr-Lys-Ala-Asp-Gln-Leu-Ala- Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Tyr-Leu-Asp-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXVII The peptide [D-Tyr ³ , Nle ¹⁸ ' ²¹ ]-AHC(3-41) having the formula:

H-D-Tyr-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His- Leu-Leu-Arg-Glu-Nle-Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu- Ala-Glu-Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala- NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXVIII The peptide [Nle ¹⁸ ' ²¹ , Arg ²³ ]-AHC(5-41) having the formula:

H-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu- Nle-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala- Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XXXIX The peptide [Nle ¹⁸ ' ²¹ , Arg ³⁶ ]-AHC(6-41) having the formula:

H-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Nle- Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala- Leu-Asn-Arg-Arg-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE XL The peptide [D-Pro ⁴ , Nle ²¹ ' ³⁸ ]-rCRF(4-41) having the formula:

H-D-Pro-Pro-He-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Val-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln- Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example III shows that it stimulates the secretion of ACTH and β-END-LI in an amount greater than oCRF and also causes a very significant lowering of blood pressure.

EXAMPLE XLI The synthesis of the human CRF (9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu- Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln- Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Ile-He-NH ₂ is conducted in a stepwise manner on a MBHA hydrochloride resin.

Specific optical rotation of the hCRF peptide, which was synthesized and purified in the foregoing manner, was measured on a Perkiri Elmer Model 141 as M ²² " = -59.5° + 1.0 (c=l in 1% acetic acid) (with correction for the presence of H ₂ 0 and TFA) and had a purity of about 95%. To check whether the precise sequence was achieved, the CRF peptide was hydrolyzed in sealed evacuated tubes containing constant boiling HC1, 3 μl of thioglycol/ml. and 1 nmol of Nle (as an internal standard) for 9 hours at 140°C. Amino acid analyses of the hydrolysates using a Beckman 121 MB amino acid analyzer showed the following amino acid ratios: Asx(1.9), Thr(0.8), Glx(9.1), Ala(5.8), Met(1.9), Leu(8.0), Phe(0.9), Lys(l.O), His(l.l) and Arg(2.0), which confirmed that the 33-residue peptide structure had been obtained.

EXAMPLE XLII The synthetic peptide AHC(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Met-Leu- Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala-Leu- Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized generally in accordance with the procedure set forth in Example I.

EXAMPLE XLIII The synthetic CRF antagonists from Examples XLI and XLII are examined for their effects on the secretion of ACTH and β-endorphin _in vitro and the synthetic AHC peptide is also examined it* vivo. The effectiveness of synthetic CRF antagonists to block the secretion of ACTH and β-endorphin by cultured rat pituitary cells is measured using the procedure as generally set forth in Vale et al.. Endocrinology, 91, 562 (1972). In_ vivo testing is carried out using the general procedure set forth in C. Rivier et al.. Science, 218, 377 (1982). Based upon five independent experiments what we herein term the standard antagonist, AHC (9-41) , blocks the secretion of ACTH due to 1 nMoCRF by 50%, at a

concentration of 197 + 72 nM. The specificity of this inhibition is demonstrated by the finding of no effect of the standard antagonist on the GRF-stimulated secretion of GH, the GnRH-stimulated secretion of LH and FSH or the TRF-stimulated secretion of TSH and prolaσtin. The effects of the antagonist on a number of different concentrations of oCRF and the ability of several different concentrations of AHC (9-41) to inhibit ACTH secretion stimulated by a constant dose of oCRF (1 nM) are considered to demonstrate competitive inhibition.

The in vivo effect of CRF antagonists is tested on the spontaneous ACTH release by adrenaleσtomized rats. The iv injection of 3 mg/kg BW (2.7 nmole) causes a marked decrease in plasma ACTH levels (measured as described in Vale et al. Science, 213, 1394, 1981), which is statistically significant for 2 hours. In the intact, non-anesthetized rats, the antagonist induces a dose-related inhibition of CRF-induced ACTH secretion, which is significant at the 0.09 pmole dose level. The antagonist AHC (9-41) also prevents most, but not all, of the ACTH rise due to ether-exposure.

These results indicate that administration of CRF antagonists reduces the spontaneous ACTH release observed after removal of the corticosteroid feedback, totally blocks the ACTH secretion caused by CRF, and inhibits most of the stressor-induced ACTH release in intact rats. Such data are comparable to those previously obtained in our laboratory with an antiserum to CRF which demonstrate the role played by endogenous CRF in regulating ACTH secretion, Rivier, C. et al.. Science, 218, 377-9(1982).

These results confirm the hypothesis that CRF is indeed a critical element in the regulation of ACTH under several circumstances. In addition, that CRF antagonists can partially block the ether-exposure- induced activation of the sympathetic nervous system

suggest a much broader role for this neuropeptide in mediating the response to stressful stimuli.

Synthetic hCRF has been shown to be a powerful stimulator of ACTH and β-END-LI secretion jji vivo in several rat preparations. Plasma levels of ACTH and β-END-LI are elevated for at least 5-20 minutes following the intraveneous administration of hCRF to nembutal-anesthesized male rats and to quiescent male or female rats with indwelling intravenous cannulae. In addition, hCRF is found to have a dramatic effect to lower blood pressure in rats and dogs.

EXAMPLE XLIV The peptide hCRF(8-41) having the formula: H-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu- Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn- Arg-Lys-Leu-Met-Glu-He-Ile-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI. EXAMPLE XLV

The peptide hCRF(10-41) having the formula: H-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala- Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn-Arg-Lys- Leu-Met-Glu-He-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE XLVI The peptide Carp Urotensin 1(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Asn-Met-

He-Glu-Met-Ala-Arg-Asn-Glu-Asn-Gln-Arg-Glu-Gln-Ala-Gly- Leu-Asn-Arg-Lys-Tyr-Leu-Asρ-Glu-Val-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE XLVII The peptide [Ala ¹⁹ , Thr ²² ]-hCRF(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Val-Ala-Glu-Met-Thr-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln- Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE XLVIII The peptide Carp Urotensin 1(8-41) having the formula: H-He-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Asn-Met- Ile-Glu-Met-Ala-Arg-Asn-Glu-Asn-Gln-Arg-Glu-Gln-Ala-Gly- Leu-Asn-Arg-Lys-Tyr-Leu-Asp-Glu-Val-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE IL The peptide [Glu ¹³ , Val ²¹ ]-hCRF(9-41) having the formula: H-Asp-Leu-Thr-Phe-Glu-Leu-Leu-Arg- Glu-Val-Leu-Glu-Val-Ala-Arg-Ala-Glu-Gln-Leu-Ala-

Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-He-Ile-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI. EXAMPLE L

The peptide [Nle ⁸ , Ser ¹¹ , Leu ³³ ]-hCRF(8-41) having the formula: H-Nle-Asp-Leu-Ser-Phe-His-Leu-Leu- Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln- Gln-Ala-His-Leu-Asn-Arg-Lys-Leu-Met-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LI The peptide [Ala ²¹ , Leu ³⁸ , Nle ⁴¹ ]-hCRF(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Val-Leu-Glu-Ala-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln- Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Glu-He-Nle-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LII The peptide [Nle ¹² ]-hCRF(10-41) having the formula: H-Leu-Thr-Nle-His-Leu-Leu-Arg-Glu-Val-Leu-Glu- Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn- Arg-Lys-Leu-Met-Glu-He-Ile-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LIII The peptide [Aσetyl-Asp ⁹ , Asp ³⁹ ]-hCRF(9-41) having the formula: Ac-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg- Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln- Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Asp-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example X1III shows that it likewise inhibits the secretion of ACTH and β-END-LI. EXAMPLE LIV

The peptide [Lys ²³ , Leu ³⁸ ]-hCR (8-41) having the formula: H-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu- Arg-Glu-Val-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Leu-Ala- Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Glu-Ile-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LV

The peptide [Nle ²¹ , Tyr ³² ]-hCRF(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-

Glu-Val-Leu-Glu-Nle-Ala-Arg-Ala-Glu-Gln-Leu-Ala- Gln-Gln-Ala-Tyr-Ser-Asn-Arg-Lys-Leu-Met-Glu-He-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LVI The peptide [Ala ²¹ , Met ³⁷ ]-sauvagine(8-40) having the formula: H-Asp-Leu-Ser-Leu-Glu-Leu-Leu-Arg-

Lys-Met-Ile-Glu-Ile-Ala-Lys-Gln-Glu-Lys-Glu-Lys-Gln-Gln-

Ala-Ala-Asn-Asn-Arg-Leu-Leu-Met-Asp-Thr-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LVII 21 22

The peptide [Ala , Arg , li 39'40] -sauvagine(9-40) having the formula: H-Leu-Ser-Leu-Glu-Leu-Leu-Arg-Lys-Met-He-Glu-Ala-Arg- Lys-Gln-Glu-Lys-Glu-Lys-Gln-Gln-Ala-Ala-Asn-Asn-Arg-Leu- Leu-Leu-Asp-He-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LVIII 2g ₃ The peptide [Leu , Met ]-sauvagine(8-40) having the formula: H-Asp-Leu-Ser-Leu-Glu-Leu-Leu-

Arg-Lys-Met-He-Glu-Ile-Glu-Lys-Gln-Glu-Lys-Leu-Lys-Gln- Gln-Ala-Ala-Asn-Asn-Arg-Leu-Leu-Met-Asp-Thr-He-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

-33- EXAMPLE LIX The peptide [CML ¹⁰ ' ¹⁵ ' ²⁷ ' ³⁷ , CMA ²² ' ³² ' ⁴¹ ]- AHC(9-41) having the formula: H-Asp-CML-Thr-Leu- Glu-CML-CML-Arg-Glu-Met-CML-Glu-Met-CMA-Lys-Ala-Glu-Gln- CML-Ala-Glu-Gln-Ala-CMA-CML-Asn-Arg-Leu-CML-Leu-Glu-Glu- CMA-NH ₂ . Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LX The peptide [Nle ¹⁸ ' ²¹ ]-AHC(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Nle-Leu- Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala-Leu- Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LXI The peptide [Nle ¹⁸ ' ²¹ ]-AHC(9-41) having the formula: H-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Nle-Leu- Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala-Leu- Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI. EXAMPLE LXII

The peptide [Nle ¹⁸ ' ²¹ ] -AHC(8-41) having the formula: H-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Nle- Leu-Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala- Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LXIII The peptide [Glu ¹³ ' ²² , Leu ¹² , Lys ²⁶ ]-AHC(8-41) having the formula: H-Leu-Asp-Leu-Thr-Leu-Glu-Leu-Leu- Arg-Glu-Met-Leu-Glu-Met-Glu-Lys-Ala-Glu-Lys-Glu-Ala-Glu- Gln-Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ . Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LXIV The synthetic peptide [Ala ¹³ ]-AHC(9-41) having the formula; H-Asp-Leu-Thr-Phe-Ala-Leu-Leu-Arg- Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln- Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

EXAMPLE LXV The peptide [Leu ¹² , Glu ¹³ ]-AHC(9-41) having the formula: H-Asp-Leu-Thr-Leu-Glu-Leu-Leu-Arg- Glu-Met-Leu-Glu-Met-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln- Ala-Ala-Leu-Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ . Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI. EXAMPLE LXVI

The peptide [CML ¹⁰ ' ¹⁴ ' ¹⁹ ' ²⁷ ' ³³ ' ³⁸ ]-AHC(9-41) having the formula: H-Asp-CML-Thr-Leu-Glu-CML-Leu-Arg- Glu-Met-CML-Glu-Met-Ala-Lys-Ala-Glu-Gln-CML-Ala-Glu-Gln- Ala-Ala-CML-Asn-Arg-Leu-CML-Leu-Glu-Glu-Ala-NH ₂ . Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise stimulates the secretion of ACTH and β-END-LI and causes a very significant lowering of blood pressure.

EXAMPLE LXVII .The peptide [Nle ¹⁸ ' ²¹ ]-AHC(10-41) having the formula: H-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Nle-Leu- Glu-Nle-Ala-Lys-Ala-Glu-Gln-Glu-Ala-Glu-Gln-Ala-Ala-Leu- Asn-Arg-Leu-Leu-Leu-Glu-Glu-Ala-NH ₂ is synthesized. Testing in accordance with the general procedure set forth in Example XLIII shows that it likewise inhibits the secretion of ACTH and β-END-LI.

CRF agonists exhibit such lowering of blood pressure that they may be particularly valuable for the treatment of high blood pressure conditions and also for the treatment of patients who are to undergo certain types of surgery.

CRF profoundly stimulates the pituitary- adrenalcortical axis, and CRF analogs should be useful to stimulate the functions of this axis in some types of patients with low endogenous glucocorticoid production. For example, CRF should be useful in restoring pituitary-adrenal function in patients having received exogenous glucocorticoid therapy whose pituitary- adrenalcortical functions remain supressed. For example, CRF antagonists may be useful in regulating pituitary-adrenal function in patients having pituitary Cushings disease or any CRF-sensitive tumor. Most other regulatory peptides have been found to have effects upon the central nervous system and upon the gastrointestinal tract. Because ACTH and β-END secretion is the "sine qua non" of mammal's response to stress, it was not surprising that CRF has significant effects on the brain as a mediator of the body's stress response. Accordingly, CRF analogs delivered to the brain should also find application in modifying the mood, learning and behavior of normal and mentally disordered individuals. Because CRF agonists elevate the levels of ACTH, β-END, β-lipotropin, other pro-opiomelanocortin gene products and corticosterone, their administration can be used to induce their effects

on the brain and its periphery to thereby influence memory, mood, pain appreciation, etc., and more specifically, alertness, depression and/or anxiety, whereas CRF antagonists could be used to achieve opposite effects. For example, when administered into the ventricles, CRF increases activity and improves learning performance in rats and thus CRF agonists may function as a natural stimulant. Furthermore, CRF antagonists in the brain could ameliorate stress-induced conditions to which endogenous CRF might contribute, including some types of hypertension, infertility, decreased libido, impotentcy and hyperglycemia, as well as to modulate the immune system, gastrointestinal tract and adrenalcortical growth and function. CRF analogs should also be of use for increasing blood flow to the gastrointestinal tract of mammals, particularly humans and other mammals. All CRF related peptides have been shown to dialate the mesenteric vascular bed. CRF antagonists may also be of use for decreasing blood flow to the gastrointestinal tract of mammals, particularly humans. Also, oCRF inhibits gastric acid production, and CRF analogs are expected to also be effective in the treatment of gastric ulcers by reducing gastric acid production and/or inhibiting gastrointestinal functions in a mammal. CRF analogs or the nontoxic addition salts thereof, combined with a pharmaceutically or veterinarily acceptable carrier to form a pharmaceutical composition, may be administered to mammals, including humans, either intravenously, subcutaneously, intramuscularly, percutaneously, e.g. intranasally, intracerebrospinally or orally. The peptides should be at least about 90% pure and preferably should have a purity of at least about 98%; however, lower purities are effective and may well be used with mammals ^' other than humans. This purity means that the intended peptide constitutes the stated weight % of all like

peptides and peptide fragments present. Administration to humans may be employed by a physician to lower blood pressure or to stimulate endogenous gluco-corticoid production. The required dosage will vary with the particular condition being treated, with the severity of the condition and with the duration of desired treatment.

These agonists may also be used to evaluate hypothalamic pituitary adrenal function in mammals with suspected endocrine or central nervous system pathology by suitable administration followed by monitoring body functions. For example, administration may be used as a diagnostic tool to evaluate the basis of Cushing's disease and affective disorders, such as depressive illness. Such peptides are often administered in the form of pharmaceutically or veterinarily acceptable nontoxic salts, such as acid addition salts or metal complexes, e.g., with zinc, iron, calcium, barium, magnesium, aluminum or the like (which are considered as addition salts for purposes of this application) . Illustrative of such acid addition salts are hydrochloride, hydrobromide, sulphate, phosphate, tannate, oxalate, fumarate, gluσonate, alginate, maleate, acetate, citrate, benzoate, sucσinate, malate, ascorbate, tartrate and the like. If the active ingredient is to be administered in tablet form, the tablet may contain a binder, such as tragacanth, corn starch or gelatin; a disintegrating agent, such as alginic acid; and a lubricant, such as magnesium stearate. If administration in liquid form is desired, sweetening and/or flavoring may be used, and intravenous administration in isotonic saline, phosphate buffer solutions or the like may be effected.

The peptides should be administered under the guidance of a physician, and pharmaceutical compositions will usually contain the peptide in conjunction with a conventional, pharmaceutically or veterinarily-

acceptable carrier. Usually, the dosage will be from about 1 to about 200 micrograms of the peptide per kilogram of the body weight of the host animal. In some instances, treatment of subjects with these peptides can be carried out in lieu of the administration of ACTH or cortiσosteroids, in such instances a dosage as low as about 10 ng/Kg of body weight may be employed. As used herein all temperatures are °C and all ratios are by volume. Percentages of liquid materials are also by volume.

Although the invention has been described with regard to its preferred embodiments, which constitute the best mode presently known to the inventors, it should be understood that various changes and modifications as would be obvious to one having the ordinary skill in this art may be made without departing from the scope of the invention which is set forth in the claims appended hereto. For example, substitutions and modifications at other positions in the CRF peptide chain can be made in accordance with present or future developments without detracting from the potency of the analogs. It appears important that the amino acid sequence from about positions 6 through 41 or equivalents thereof be present in the synthetic peptide agonists, whereas the remainder of the molecule does not appear as critical. For instance, instead of the simple amide at the C-terminal, a lower alkyl-substituted amide, e.g. 1 to 4 carbons, i.e. me hylamide, ethylamide, etc, may be incorporated. Likewise from one to ten additional amino acid residues can be included at the N-terminal without significantly adversely affecting biological potency. Such peptides are considered as equivalents which fall within the scope of the invention.