LOCALLY-INDUCED ADIPOSE TISSUE BROWNING BY MICRONEEDLE PATCH FOR OBESITY TREATMENT

This application claims the benefit of U.S. Provisional Application No. 62/558,348, filed on September 13, 2017, which is incorporated herein by reference in its entirety.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

This invention was made with government support under Grant Nos. 1UL1TR001111, R00DK97455, and P30DK063608 awarded by the National Institute of Health. The

Government has certain rights in the invention.

BACKGROUND

Obesity has been classified as a disease by the American Medical Association in 2013 and recognized as one of the most serious public health problems in the 21 ^st century along with the rapid global socioeconomic development. Obesity-associated disorders such as type-2 diabetes, cardiovascular diseases, and cancer, have become a global threat to human health. Particularly in the United States, more than one-third of the adult population are obese, and the prevalence is going to roar in the next decades. Current treatments for obesity include restriction of calorie intake by diet programs, promoting energy expenditure through physical exercise, pharmacological therapy, as well as bariatric surgeries and liposuction. However, most therapeutics come with undesired side effects on human organs such as gastrointestine, liver, and kidney, and surgeries involve high risks. Therefore, there is an urgent requirement to exploit effective treatments for obesity. The compositions and methods disclosed herein address these and other needs.

SUMMARY

Disclosed herein are particles comprising: an adipose tissue browning agent and/or fat modulating agent. In one aspect, the adipose tissue browning agent can comprise

rosiglitazone (Rosi), CL 316243, or any combination thereof.

In one aspect, the particles of any preceding aspect can further comprising a pH- altering agent (such as for example, an agent that reduces pH), a peroxide-metabolizing enzyme (such as, for example catalase), and/or a pH -responsive matrix. In one aspect, the pH-altering agent can comprise a glucose responsive enzyme (such as, for example, glucose oxidase (GOx). Also disclosed herein are particles of any preceding aspect, wherein the pH- responsive matrix is degradable in a relatively acidic pH compared to physiological pH. In one aspect, the pH responsive matrix can comprise a polymer such as a polymer of dextran monomers (for example a polymer of m-dextran monomers).

In one aspect, disclosed herein are particles of any preceding aspect, further comprising a encapsulating material (such as, for example, a surfactant or other polymer) that encapsulates the pH responsive matrix. In one aspect, the encapsulating material can comprise alginate, a polysaccharide (for example chitosan) and/or polymers comprising polyvinylpyrrolidine.

In one aspect, disclosed herein are devices for the transport of a material across a biological barrier of a subject comprising the nanoparticle of any preceding aspect. In one aspect, disclosed herein are devices for transport of a material across a biological barrier of a subject comprising a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning agent and/or fat modulating agent.

Also disclosed herein are devices of any preceding aspect, wherein the plurality of particles are attached to the plurality of microneedles.

In one aspect, disclosed herein are devices of any preceding aspect, wherein the plurality of microneedles comprises a biocompatible polymer (such as, for example, methacrylated hyaluronic acid (m-HA)). In one aspect, biocompatible polymer can be crosslinked. Also disclosed herein are devices of any preceding aspect, wherein the plurality of microneedles have a center-to-center interval of about 200 μιη to about 800 μιη and/or wherein the plurality of microneedles have a height of about 600 nm to 1.8 μιη.

In one aspect disclosed herein are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent (also referred to herein as a fat modulator) comprising providing a device for transport of a material across a biological barrier of a subject comprising: a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning and/or fat modulating agent; and

administering the device to a subject in need of an adipose tissue browning and/or fat modulating agent. In one aspect, the delivery of the browning agent to white adipose tissue can convert at least a portion of the subdermal white adipose tissue to brown adipose tissue. In one aspect delivery of the fat modulating agent can induce apoptosis, lipid uptake, lipolysis, or kill fat cells.

In one aspect, disclosed herein are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent of any preceding aspect, wherein the device is administered to a location of the subject' s body, the location comprising subdermal white adipose tissue. Also disclosed are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent of any preceding aspect and/or fat modulating agent, wherein the administering step b) comprises inserting the plurality of microneedles into a biological barrier.

In one aspect, disclosed herein are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent of any preceding aspect, wherein the plurality of particles further comprises a pH altering agent and a pH-responsive matrix. In one aspect, the pH altering agent can decrease the pH within the nanoparticles, and wherein the decrease in pH degrades the pH-responsive matrix and releases the adipose tissue browning agent and/or fat modulating agent. In one aspect, disclosed herein are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent of any preceding aspect wherein the device releases the adipose tissue browning agent and/or fat modulating agent in hyperglycemic conditions.

Also disclosed herein are methods of treating a disease (such as, for example obesity or diabetes) in a subject in need thereof comprising providing a device for transport of a material across a biological barrier of a subject comprising: a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning agent and/or fat modulating agent; and administering the device to a subject in need of treating a disease. In one aspect, the methods of treating a disease (such as, for example obesity or diabetes) can reduce the subject' s subdermal white adipose tissue.

In one aspect disclosed herein are methods of treating a disease of any preceding aspect, wherein the administering step b) comprises inserting the plurality of microneedles into a biological barrier. Also disclosed herein are methods of treating of any preceding aspect wherein the plurality of particles further comprises a pH altering agent and a pH- responsive matrix. In one aspect, the pH altering agent decreases the pH within the nanoparticles, and wherein the decrease in pH degrades the pH-responsive matrix and releases the adipose tissue browning agent and/or fat modulating agent. Also disclosed herein are methods of treating a disease of any preceding aspect, wherein the administering step b) modulates (for example, increases) expression of one or more brown adipocyte genes (such as, for example Ucpl, Dio2, ElovB, Cidea, Pgc-la, Cox7al, or Cox8b), adiponectin, and/or PPARy target aP2.

In one aspect, disclosed herein are methods of treating of any preceding aspect, wherein the method decreases expression of one or more white adipocyte genes. Also disclosed herein are methods of treating of any preceding aspect, wherein the method increases energy expenditure and fatty acid oxidation of the subject, increases insulin sensitivity and/or avoids significant skin lesions.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying figures, which are incorporated in and constitute a part of this specification, illustrate several aspects described below.

Figure 1 shows a schematic depicting a browning agents-loaded transcutaneous MN patch. Nanoparticles (NPs) encapsulating rosiglitazone (Rosi), glucose oxidase (GOx), and catalase (CAT) are prepared from pH-sensitive acetal-modified dextran and coated with alginate. NPs are further loaded into the microneedle- array patch made of crosslinked hyaluronic acid (HA) matrix for brown-remodeling of white fat.

Figures 2A, 2B, 2C, 2D, 2E, 2F, 2G, 21, 2J, 2K, and 2L show a set of graphs and micrographs depicting fabrication and characterization of browning agent microneedles. Figure 2A shows the average hydrodynamic sizes of Rosi NPs determined by DLS. Figrue 2B shows the relevant pH changes of dextran NPs with or without GOx in PBS buffer in the presence of 100 mg/dL glucose. (n=3) Figure 2C shows In vitro accumulated Rosi release from the acid-degradable dextran NPs (w/ or w/o GOx) in PBS buffer containing 100 mg/dL glucose at 37°C. (n=3) (2d) UV absorbance of NPs suspensions A400 nm. (n=3) (2e) SEM images of Rosi NPs incubated in PBS buffer with 100 mg/dL glucose at 37°C on day 0 and day 4 (scale bar: 2 μιη), inserted pictures show the transparency change of the NPs suspension. Figure 2F shows comparable adipogenesis between Rosi NPs- and Rosi compound-treated PgKO-MEFs as assessed by aP2 and Perilipin gene expression. (n=4). Figure 2G shows the same level of browning induced by Rosi NPs or Rosi compound in the mature 3T3-L1 white adipocytes. (n=4). (2i) SEM image of the MN array (scale bar: 200 μιη). Figure 2J shows higher magnification of SEM imaging of MN tip confirmed that the MN was loaded with NPs (scale bar: 10 μιη). Figrue 2K shows SEM image of MNs 3 days post administration. Figure 2L shows trypan blue staining image of mouse skin administered with MN patch (scale bar: 1 mm). Error bars indicate standard deviation (SD), two-tailed Student's t-test, * P<0.05, ** P<0.01.

Figures 3A and 3B show a set of micrographs and bar charts depicting in vivo browning induction by MN patches in the lean mice. Figure 3A shows hematoxylin and eosin (H&E)-stained section of the cross-sectional mouse inguinal adipose tissue treated with HA empty MN patch (left), Rosi NP-loaded MN patch (middle), and CL 316243 NP-loaded MN patch (right) (scale bar: 25 μιη). Figure 3B shows Q-PCR analysis of gene expression in inguinal WAT treated with MN patches loaded with HA empty vehicle (EV), Rosi, or CL 316243 (CL). NP-loaded MN patch. Error bars indicate standard error of the mean (SEM), two-tailed Student's t-test, * P<0.05, ** P<0.01 compared to EV (n=6).

Figures 4A, 4B, 4C, 4D, 4E, 4F, and 4G show a set of bar charts and line graphs depicting indirect calorimetric analysis of healthy mice treated with HA empty MN patch (EV), Rosi NP-loaded MN patch (Rosi), or CL 316243 NP-loaded MN patch (CL). Figure 4A shows the body weight change after the 6-day treatment. Figure 4B shows the normalized inguinal fat pad size. Figure 4C shows the normalized epididymal fat pad size. Figure 4D shows the average food intake during the treatment. Figure 4E shows the locomotor activity during one 24-h dark/light cycle. The panel on the right is the area under curve (AUC). Figure 4F shows the oxygen consumption and AUC. Figure 4G shows the respiration exchange ratio (RER) and AUC during one dark/light cycle. Error bars indicate SEM, two- tailed Student's t-test, * P<0.05, ** P<0.01 compared to EV (n=6).

Figure 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 51, and 5J show a set of photographs, line graphs, micrographs, and bar charts depicting in vivo anti-obesity and anti-diabetic effects of MN patches in an HFD-induced obese mouse model. Figure 5A shows a picture illustrating mice treated with browning agent patch on one inguinal side (red) and empty vehicle patch on the other side (blue). Figure 5B shows the normalized body weight of mice without treatment or treated with browning agent patches. Figure 5C shows IPGTT test in mice 2 weeks post-treatment. Figure 5D shows blood glucose levels of mice treated with browning agent patches or empty patches after 16 h fasting. Figure 5E shows normalized epididymal fat pad size in mice with different treatments. Figure 5F shows normalized weight of interscapular fat pad size in mice with different treatments. Figure 5G shows the ratio of the treated inguinal fat pad size to untreated side. Figure 5H shows photos of two sides of inguinal adipose tissues from obese mice 4-weeks post treatment. Figure 51 shows H&E staining of inguinal adipose tissues (scale bar: 50 μιη). Figure 5J shows Q-PCR analysis of adipocyte gene expressions in inguinal tissues, b-g, Error bars indicate SD, two-tailed Student's ί-test, * P<0.05, ** P<0.01 compared to EV (n=5); j, Error bars indicate SEM, two- tailed Student's i-test, * P<0.05, ** P<0.01 compared to EV (n=5).

Figure 6 shows a schematic depicting the synthesis and dissociation routes of m- dextran.

Figure 7 shows a graph depicting the mechanical behavior of one NP-loaded MN.

Figure 8 shows a fluorescence microscopy image of inguinal adipose tissue section after treatment of fluorescein isothiocyanate (FITC)-encapsulated NP through the microneedle patch (scale bar: 200 μηι).

Figure 9 shows an image of in vivo fluorescence of a mouse treated with Cy5.5- labelled NPs-loaded MNs at different time points. Cy5.5-labelled non-degradable NPs without glucose specific enzyme (GOx) were loaded into crosslinked HA MNs.

Figure 10 shows an image of in vivo fluorescence of MN-treated mice at different time points. The fluorescent signal showed the MN patch loaded with free Cy5.5 (upper panel) or Cy 5.5 -entrapped NPs (lower panel).

Figure 11 shows a micrograph of H&E-stained skin sections administered empty,

Rosi NP-loaded, and CL 316243 NP-loaded MNs (from left to right) with surrounding tissues after one month of treatment (scale bar: 100 μιη).

DETAILED DESCRIPTION

Disclosed herein are novel controlled-release nanoparticle compositions that provide physiologically relevant levels of therapeutic, prophylactic, locally to the site of

administration.

Reference will now be made in detail to the embodiments of the invention, examples of which are illustrated in the drawings and the examples. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Terminology

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this invention belongs. The following definitions are provided for the full understanding of terms used in this specification. As used in the specification and claims, the singular form "a," "an," and "the" include plural references unless the context clearly dictates otherwise. For example, the term "an agent" includes a plurality of agents, including mixtures thereof.

As used herein, the terms "may," "optionally," and "may optionally" are used interchangeably and are meant to include cases in which the condition occurs as well as cases in which the condition does not occur. Thus, for example, the statement that a formulation "may include an excipient" is meant to include cases in which the formulation includes an excipient as well as cases in which the formulation does not include an excipient.

The terms "about" and "approximately" are defined as being "close to" as understood by one of ordinary skill in the art. In one non-limiting embodiment, the terms are defined to be within 10% of the associated value provided. In another non- limiting embodiment, the terms are defined to be within 5%. In still another non- limiting embodiment, the terms are defined to be within 1%.

"Administration" to a subject includes any route of introducing or delivering to a subject an agent. Administration can be carried out by any suitable route, including oral, topical, intravenous, subcutaneous, transcutaneous, transdermal, intramuscular, intra-joint, parenteral, intra-arteriole, intradermal, intraventricular, intracranial, intraperitoneal, intralesional, intranasal, rectal, vaginal, by inhalation, via an implanted reservoir, parenteral (e.g., subcutaneous, intravenous, intramuscular, intra-articular, intra-synovial, intrasternal, intrathecal, intraperitoneal, intrahepatic, intralesional, and intracranial injections or infusion techniques), and the like. "Concurrent administration", "administration in combination", "simultaneous administration" or "administered simultaneously" as used herein, means that the compounds are administered at the same point in time or essentially immediately following one another. In the latter case, the two compounds are administered at times sufficiently close that the results observed are indistinguishable from those achieved when the compounds are administered at the same point in time. "Systemic administration" refers to the introducing or delivering to a subject an agent via a route which introduces or delivers the agent to extensive areas of the subject's body (e.g. greater than 50% of the body), for example through entrance into the circulatory or lymph systems. By contrast, "local administration" refers to the introducing or delivery to a subject an agent via a route which introduces or delivers the agent to the area or area immediately adjacent to the point of administration and does not introduce the agent systemically in a therapeutically significant amount. For example, locally administered agents are easily detectable in the local vicinity of the point of administration, but are undetectable or detectable at negligible amounts in distal parts of the subject's body. Administration includes self-administration and the administration by another.

"Biocompatible" generally refers to a material and any metabolites or degradation products thereof that are generally non-toxic to the recipient and do not cause significant adverse effects to the subject.

"Comprising" is intended to mean that the compositions, methods, etc. include the recited elements, but do not exclude others. "Consisting essentially of when used to define compositions and methods, shall mean including the recited elements, but excluding other elements of any essential significance to the combination. Thus, a composition consisting essentially of the elements as defined herein would not exclude trace contaminants from the isolation and purification method and pharmaceutically acceptable carriers, such as phosphate buffered saline, preservatives, and the like. "Consisting of shall mean excluding more than trace elements of other ingredients and substantial method steps for administering the compositions of this invention. Embodiments defined by each of these transition terms are within the scope of this invention.

As used herein, "modulate" means to effectuate a change (either an increase or a decrease) in the amount of gene expression, protein expression, amount of a symptom, disease, composition, condition, or activity.

An "increase" can refer to any change that results in a greater gene expression, protein expression, amount of a symptom, disease, composition, condition or activity. An increase can be any individual, median, or average increase in a condition, symptom, activity, composition in a statistically significant amount. Thus, the increase can be a 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% increase so long as the increase is statistically significant.

A "decrease" can refer to any change that results in a smaller gene expression, protein expression, amount of a symptom, disease, composition, condition, or activity. A substance is also understood to decrease the genetic output of a gene when the genetic output of the gene product with the substance is less relative to the output of the gene product without the substance. Also for example, a decrease can be a change in the symptoms of a disorder such that the symptoms are less than previously observed. A decrease can be any individual, median, or average decrease in a condition, symptom, activity, composition in a statistically significant amount. Thus, the decrease can be a 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% decrease so long as the decrease is statistically significant. A "control" is an alternative subject or sample used in an experiment for comparison purposes. A control can be "positive" or "negative."

"Controlled release" or "sustained release" refers to release of an agent from a given dosage form in a controlled fashion in order to achieve the desired pharmacokinetic profile in vivo. An aspect of "controlled release" agent delivery is the ability to manipulate the formulation and/or dosage form in order to establish the desired kinetics of agent release.

"Effective amount" of an agent refers to a sufficient amount of an agent to provide a desired effect. The amount of agent that is "effective" will vary from subject to subject, depending on many factors such as the age and general condition of the subject, the particular agent or agents, and the like. Thus, it is not always possible to specify a quantified "effective amount." However, an appropriate "effective amount" in any subject case may be determined by one of ordinary skill in the art using routine experimentation. Also, as used herein, and unless specifically stated otherwise, an "effective amount" of an agent can also refer to an amount covering both therapeutically effective amounts and prophylactically effective amounts. An "effective amount" of an agent necessary to achieve a therapeutic effect may vary according to factors such as the age, sex, and weight of the subject. Dosage regimens can be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation.

"Peptide," "protein," and "polypeptide" are used interchangeably to refer to a natural or synthetic molecule comprising two or more amino acids linked by the carboxyl group of one amino acid to the alpha amino group of another.

"Pharmaceutically acceptable" component can refer to a component that is not biologically or otherwise undesirable, i.e., the component may be incorporated into a pharmaceutical formulation of the invention and administered to a subject as described herein without causing significant undesirable biological effects or interacting in a deleterious manner with any of the other components of the formulation in which it is contained. When used in reference to administration to a human, the term generally implies the component has met the required standards of toxicological and manufacturing testing or that it is included on the Inactive Ingredient Guide prepared by the U.S. Food and Drug Administration.

"Pharmaceutically acceptable carrier" (sometimes referred to as a "carrier") means a carrier or excipient that is useful in preparing a pharmaceutical or therapeutic composition that is generally safe and non-toxic, and includes a carrier that is acceptable for veterinary and/or human pharmaceutical or therapeutic use. The terms "carrier" or "pharmaceutically acceptable carrier" can include, but are not limited to, phosphate buffered saline solution, water, emulsions (such as an oil/water or water/oil emulsion) and/or various types of wetting agents. As used herein, the term "carrier" encompasses, but is not limited to, any excipient, diluent, filler, salt, buffer, stabilizer, solubilizer, lipid, stabilizer, or other material well known in the art for use in pharmaceutical formulations and as described further herein.

"Pharmacologically active" (or simply "active"), as in a "pharmacologically active" derivative or analog, can refer to a derivative or analog (e.g., a salt, ester, amide, conjugate, metabolite, isomer, fragment, etc.) having the same type of pharmacological activity as the parent compound and approximately equivalent in degree.

"Primer" or "DNA primer" is a short polynucleotide, generally with a free 3'-0H group that binds to a target or "template" potentially present in a sample of interest by hybridizing with the target, and thereafter promoting polymerization of a polynucleotide complementary to the target. A "polymerase chain reaction" ("PCR") is a reaction in which replicate copies are made of a target polynucleotide using a "pair of primers" or a "set of primers" consisting of an "upstream" and a "downstream" primer, and a catalyst of polymerization, such as a DNA polymerase, and typically a thermally-stable polymerase enzyme. Methods for PCR are well known in the art, and taught, for example in "PCR: A PRACTICAL APPROACH" (M. MacPherson et al., IRL Press at Oxford University Press (1991)). All processes of producing replicate copies of a polynucleotide, such as PCR or gene cloning, are collectively referred to herein as "replication." A primer can also be used as a probe in hybridization reactions, such as Southern or Northern blot analyses. Sambrook et al., supra.

"Polymer" refers to a relatively high molecular weight organic compound, natural or synthetic, whose structure can be represented by a repeated small unit, the monomer. Non- limiting examples of polymers include polyethylene, rubber, cellulose. Synthetic polymers are typically formed by addition or condensation polymerization of monomers. The term "copolymer" refers to a polymer formed from two or more different repeating units

(monomer residues). By way of example and without limitation, a copolymer can be an alternating copolymer, a random copolymer, a block copolymer, or a graft copolymer. It is also contemplated that, in certain aspects, various block segments of a block copolymer can themselves comprise copolymers. The term "polymer" encompasses all forms of polymers including, but not limited to, natural polymers, synthetic polymers, homopolymers, heteropolymers or copolymers, addition polymers, etc. "Therapeutic agent" refers to any composition that has a beneficial biological effect. Beneficial biological effects include both therapeutic effects, e.g., treatment of a disorder or other undesirable physiological condition, and prophylactic effects, e.g., prevention of a disorder or other undesirable physiological condition (e.g., Type 1 diabetes). The terms also encompass pharmaceutically acceptable, pharmacologically active derivatives of beneficial agents specifically mentioned herein, including, but not limited to, salts, esters, amides, proagents, active metabolites, isomers, fragments, analogs, and the like. When the terms "therapeutic agent" is used, then, or when a particular agent is specifically identified, it is to be understood that the term includes the agent per se as well as pharmaceutically acceptable, pharmacologically active salts, esters, amides, proagents, conjugates, active metabolites, isomers, fragments, analogs, etc.

"Therapeutically effective amount" or "therapeutically effective dose" of a composition (e.g. a composition comprising an agent) refers to an amount that is effective to achieve a desired therapeutic result. In some embodiments, a desired therapeutic result is the control of type I diabetes. In some embodiments, a desired therapeutic result is the control of obesity. Therapeutically effective amounts of a given therapeutic agent will typically vary with respect to factors such as the type and severity of the disorder or disease being treated and the age, gender, and weight of the subject. The term can also refer to an amount of a therapeutic agent, or a rate of delivery of a therapeutic agent (e.g., amount over time), effective to facilitate a desired therapeutic effect, such as pain relief. The precise desired therapeutic effect will vary according to the condition to be treated, the tolerance of the subject, the agent and/or agent formulation to be administered (e.g., the potency of the therapeutic agent, the concentration of agent in the formulation, and the like), and a variety of other factors that are appreciated by those of ordinary skill in the art. In some instances, a desired biological or medical response is achieved following administration of multiple dosages of the composition to the subject over a period of days, weeks, or years.

Ranges can be expressed herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. It is also understood that there are a number of values disclosed herein, and that each value is also herein disclosed as "about" that particular value in addition to the value itself. For example, if the value" 10" is disclosed, then "about 10" is also disclosed.

Publications cited herein are hereby specifically incorporated by reference in their entireties and at least for the material for which they are cited.

Recent studies have revealed a crucial role of brown adipose tissue (BAT), a primary heat generation organ, in energy expenditure in mammals. White adipose tissue (WAT) stores exceeded energy as triglycerides, leading to overweight; whereas BAT dissipates energy by producing heat through nonshivering thermogenesis, which may facilitate the suppression of obesity. The transformation of WAT into BAT provides an alternative approach for the treatment of obesity and related metabolic disorders. A variety of genes and pathways that regulate adipocyte development have been identified. However, numerous browning agents (for example, Thiazolidinediones such as, for example, Rosiglitazone and/or Pioglitazone) that can promote "browning" on WAT face challenges in clinical application because of undesired side effects on other organs as a result of a broad targeting spectrum. The compositions disclosed herein accomplish this goal. Thus, in one aspect disclosed herein are methods of reducing the side effects of adipose tissue modulators and/or browning agents including but not limited to Thiazolidinediones (such as, for example, Rosiglitazone and/or Pioglitazone), sibutramine, lorcaserine, and/or orlistat or any other adipose tissue modulator or browning agent disclosed herein comprising providing a device for transport of a material across a biological barrier of a subject comprising: a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising the adipose tissue browning agent and/or fat modulating agent.

In one aspect, disclosed herein are particles comprising: an adipose tissue browning agent. As used herein, a browning agent refers to an agent that induces the conversion of

WAT to BAT. Examples of adipose tissue browning agents include, but are not limited to β- adrenergic agonists, leptin, TLQP-2L brain-derived neurothrophic factor, prostaglandins, cardiac natriuretic peptides, PPARy ligands, PPARa ligands, retinoids, thyroid hormones, AMPK activators, Irisin, fibroblast growth factor 21, and bone morphogenetic protein (M.L. Bonet et at , Biochimica et Biophysica Acta 1831, 969-985(2013)). Preferred browning agents include PPARy activators (e.g. Rosiglitazone, (RS)-5-[4-(2-[methyl(pyridin-2- yl)amino]ethoxy)benzyl]thiazolidine-2,4-dione, Pioglitazone, (RS)-5-(4-[2-(5-ethylpyridin-2- yl)etlioxy]benzyi)thiazolidine-2,4-dionej Troglitazone, (RS)-5-(4-[(6-hydroxy-2,5,7,8- tetramethylchroman-2-yl)methoxy]benzyl)thiazolidine-2,4-dion e etc.), prostagladin E2 analog (PGE2, (5Z,1 la,13E, 15S)-7-[3-hydroxy-2-(3-hydroxyoct-l-enyl)- 5-oxo-cyclopentyl] hept-5-enoic acid etc.), beta3 adrenoceptor agonist (CL 316243, Disodium 5-[(2R)-2-[[(2R)- 2-(3-Chlorophenyl)-2-hydroxyethyl]amino]propyl]- 1 ,3-benzodioxole-2,2-dicarboxylate hydrate, etc. ), Fibroblast Growth Factor 21 (FGF-21), and/or Irisin.

In one aspect, disclosed herein are microparticles comprising a fat modulating agent.

As used herein, a fat modulating agent (also referred to as a fat modulator or adipose tissue modulator) can comprise any chemical, RNA, DNA, protein that can induce lipid uptake, lipolysis, and/or apoptosis to simply kill the fat cells locally. Examples of lipid modulators include, but are not limited to INVOKANA®, FARXIGA®, JARDIANCE®,

STEGLATRO®, orlistat, Sibutramine, Diethylpropion, Phentermine, lorcaserin, Naltrexone, Liraglutide, niacin receptor agonists (including, but not limited to niacin, acipimox, aceifran, (D) -hydroxybutyrate, l-alkyl-benzotriazole-5-carboxylic acid, and xanthine derivatives), hormone sensitive lipase inhibitors (such as, for example, -phenyl-5-alkoxy-l,3,4-oxadiazol- 2-ones, and 5-(2H)-isoxazolonyl) ureas), β- Adrenergic Receptors (such as, for example, Rafabegron (AJ-9677) and L-796568), Al receptor agonists, phosphatidylcholine and deoxycholate derivates, Pitavastatin, Benzafibrate, Gemfibrazil, corticosteroids (mch as, lor example, dexamethasosu;), c clic AMP icAMF) activators isoeh as, for example, isobotylmethyixaMhiaeK and statins.

In one aspect, the particles can further comprising a pH-altering agent (such as for example, an agent that reduces pH), a peroxide-metabolizing enzyme (such as, for example catalase), and/or a pH-responsive matrix. In one aspect, the pH-altering agent can comprise a glucose responsive enzyme (such as, for example, glucose oxidase (GOx).

It is understood and herein contemplated that the particles may have any desired size for the intended use. For example, the particles may have any diameter from 10 nm to 1,000 nm. The particle can have a diameter from 10 nm to 900 nm, from 10 nm to 800 nm, from 10 nm to 700 nm, from 10 nm to 600 nm, from 10 nm to 500 nm, from 20 nm from 500 nm, from 30 nm to 500 nm, from 40 nm to 500 nm, from 50 nm to 500 nm, from 50 nm to 400 nm, from 100 nm to 400 nm, from 150 nm to 400 nm, or from 175nm to 400 nm. In preferred embodiments the particles can have a diameter less from about 200nm to about 300nm, more preferably from about 225 to about 275. For example, in one aspect the particles can have a diameter less than 275nm, such as about 250nm.

Also disclosed herein are particles particles comprising an adipose tissue browning agent and/or fat modulating agent, wherein the micelle is degradable in a relatively acidic pH compared to physiological pH (approximately between 7.35-7.45). For example, the pH can be reduced to a pH of 7.2, 7.1, 7.0, 6.9, 6.8, 6.7, 6.6, 6.5, 6.4, 6.3, 6.2, 6.1, 6.0, 5.9, 5.8, 5.7, 5.6, 5.5, 5.4, 5.3, 5.2, 5.1, 5.0, 4.9, 4.8, 4.7, 4.6, 4.5, 4.4, 4.3, 4.2, 4.1, or 4.0. In one aspect, the pH responsive matrix can comprise a polymer such as a polymer of dextran monomers (for example a polymer of m-dextran monomers).

In one aspect, disclosed herein are particles, further comprising encapsulating material (such as, for example, a surfactant or other polymer) that encapsulates the pH responsive matrix. In one aspect, the encapsulating material can comprise alginate, a polysaccharide (for example chitosan), and/or polymers comprising polyvinylpyrrolidine. In one aspect, disclosed herein are devices for the transport of a material across a biological barrier of a subject comprising the nanoparticle disclosed herein.

Thus, in one aspect, disclosed herein are devices for transport of a material across a biological barrier of a subject comprising a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning agent and/or fat modulating agent.

It is understood and herein contemplated that the adipose tissue browning agents and/or fat modulating agents, pH-altering agent (such as for example, an agent that reduces pH), a peroxide-metabolizing enzyme (such as, for example catalase), surfactants, and/or a pH-responsive matrix of the disclosed particles can each individually or in combination provide be toxic to the tissue of a subject contact with the particle. Accordingly, it is understood and herein contemplated that controlled release over time and limited release to the vicinity of administration (i.e., not systemic) can decrease the toxic effects of the particles. Thus, in one aspect, the plurality of particles are attached to the plurality of microneedles.

It is understood and herein contemplated plurality of microneedles can comprise a biocompatible polymer (such as, for example, methacrylated hyaluronic acid (m-HA)). In one aspect, biocompatible polymer can be crosslinked. Such polymers can also serve to slowly release the adipose browning agent and/or fat modulating agent into tissue. As used herein biocompatible polymers include, but are not limited to polysaccharides; hydrophilic polypeptides; poly(amino acids) such as poly-L-glutamic acid (PGS), gamma-polyglutamic acid, poly-L-aspartic acid, poly-L- serine, or poly-L-lysine; polyalkylene glycols and polyalkylene oxides such as polyethylene glycol (PEG), polypropylene glycol (PPG), and poly (ethylene oxide) (PEO); poly(oxyethylated polyol); poly(olefinic alcohol); polyvinylpyrrolidone) ; poly (hydroxy alky Imethacrylamide) ; poly (hydroxy alky Imethacrylate) ; poly (saccharides); poly(hydroxy acids); poly(vinyl alcohol), polyhydroxyacids such as poly(lactic acid), poly (gly colic acid), and poly (lactic acid-co-glycolic acids);

polyhydroxyalkanoates such as poly3-hydroxybutyrate or poly4-hydroxybutyrate;

polycaprolactones; poly(orthoesters); poly anhydrides; poly(phosphazenes); poly(lactide-co- caprolactones); polycarbonates such as tyrosine polycarbonates; polyamides (including synthetic and natural polyamides), polypeptides, and poly(amino acids); polyesteramides; polyesters; poly(dioxanones); poly(alkylene alkylates); hydrophobic polyethers;

polyurethanes; polyetheresters; polyacetals; polycyanoacrylates; polyacrylates;

polymethylmethacrylates; polysiloxanes; poly(oxyethylene)/poly(oxypropylene) copolymers; polyketals; polyphosphates; polyhydroxy valerates; poly alky lene oxalates; poly alky lene succinates; poly(maleic acids), as well as copolymers thereof. Biocompatible polymers can also include polyamides, polycarbonates, polyalkylenes, polyalkylene glycols, polyalkylene oxides, polyalkylene terepthalates, polyvinyl alcohols, polyvinyl ethers, polyvinyl esters, polyvinyl halides, polyvinylpyrrolidone, polyglycolides, polysiloxanes, polyurethanes and copolymers thereof, alkyl cellulose, hydroxyalkyl celluloses, cellulose ethers, cellulose esters, nitro celluloses, polymers of acrylic and methacrylic esters, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxy-propyl methyl cellulose, hydroxybutyl methyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, cellulose acetate phthalate, carboxylethyl cellulose, cellulose triacetate, cellulose sulphate sodium salt, poly (methyl methacrylate), poly(ethylmethacrylate), poly (buty Imethacrylate), poly(isobutylmethacrylate), poly(hexlmethacrylate), poly(isodecylmethacrylate), poly(lauryl methacrylate), poly (phenyl methacrylate), poly(methyl acrylate), poly(isopropyl acrylate), poly(isobutyl acrylate), poly(octadecyl acrylate), polyethylene, polypropylene, poly(ethylene glycol), poly(ethylene oxide), poly(ethylene terephthalate), poly(vinyl alcohols), poly(vinyl acetate, poly vinyl chloride polystyrene and polyvinylpyrrolidone, derivatives thereof, linear and branched copolymers and block copolymers thereof, and blends thereof. Exemplary biodegradable polymers include polyesters, poly(ortho esters), poly(ethylene amines), poly(caprolactones), poly(hydroxybutyrates), poly (hydroxy valerates), polyanhydrides, poly(acrylic acids), polyglycolides, poly(urethanes), polycarbonates, polyphosphate esters, polyphospliazenes, derivatives thereof, linear and branched copolymers and block copolymers thereof, and blends thereof.

In some embodiments the particle contains biocompatible and/or biodegradable polyesters or polyanhydrides such as poly (lactic acid), poly(glycolic acid), and poly (lactic - co-glycolic acid). The particles can contain one more of the following polyesters:

homopolymers including glycolic acid units, referred to herein as "PGA", and lactic acid units, such as poly-L-lactic acid, poly-D-lactic acid, poly-D,L-lactic acid, poly-L-lactide, poly-D-lactide, and poly-D,L-lactide5 collectively referred to herein as "PLA", and caprolactone units, such as poly(e-caprolactone), collectively referred to herein as "PCL"; and copolymers including lactic acid and glycolic acid units, such as various forms of poly(lactic acid-co-glycolic acid) and poly(lactide-co-glycolide) characterized by the ratio of lactic acid:glycolic acid, collectively referred to herein as "PLGA"; and polyacrylates, and derivatives thereof. Exemplary polymers also include copolymers of polyethylene glycol (PEG) and the aforementioned polyesters, such as various forms of PLGA-PEG or PLA-PEG copolymers, collectively referred to herein as "PEGylated polymers". In certain

embodiments, the PEG region can be covalently associated with polymer to yield "PEGylated polymers" by a cleavable linker. In one aspect, the polymer comprises at least 60, 65, 70, 75, 80, 85, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, or 99 percent acetal pendant groups.

In one aspect, the disclosed devices can comprise a plurality of microneedles, wherein the plurality of microneedles have a center-to-center interval of about 200 μιη to about 800 μιη, for example a center to center interval of about 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, or 800μιη.

It is also understood and herein contemplated that the disclosed plurality of microneedles in the disclosed devices is effective when the length of the needle is sufficiently long to reach desired tissues below the dermal layer. Thus, in one aspect, disclosed herein are devices wherein the plurality of microneedles have a height of about 600 nm to 1.8 μιη. For example, the plurality of microneedles can have a height of about 600, 650, 700, 750, 800, 850, 900, 950nm, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8 μιη.

In one aspect disclosed herein are methods of locally delivering a drug (such as, for example, an adipose tissue browning agent and/or fat modulating agent) to adipose tissue comprising providing a device for transport of a material across a biological barrier of a subject comprising: a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning agent and/or fat modulating agent; and administering the device to a subject in need of an adipose tissue browning agent and/or fat modulating agent. In one aspect, the delivery of the browning agent to white adipose tissue can convert at least a portion of the subdermal white adipose tissue to brown adipose tissue. In another aspect, the fat modulating agent can induce lipolysis, lipid uptake, or apoptosis.

In one aspect, disclosed herein are methods of locally delivering a drug (such as, for example, an adipose tissue browning agent and/or fat modulating agent) to adipose tissue, wherein the device is administered to a location of the subject's body, the location comprising subdermal white adipose tissue. Also disclosed are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent, wherein the administering step b) comprises inserting the plurality of microneedles into a biological barrier.

In one aspect, disclosed herein are methods of locally delivering a drug (such as, for example, an adipose tissue browning agent and/or fat modulating agent) to adipose tissue, wherein the plurality of particles further comprises a pH altering agent and a pH-responsive matrix. In one aspect, the pH altering agent can decrease the pH within the nanoparticles, and wherein the decrease in pH degrades the pH-responsive matrix and releases the adipose tissue browning agent and/or fat modulating agent. In one aspect, disclosed herein are methods of locally delivering an adipose tissue browning agent and/or fat modulating agent wherein the device releases the adipose tissue browning agent and/or fat modulating agent in hyperglycemic conditions.

Also disclosed herein are methods of treating a disease (such as, for example obesity or diabetes) in a subject in need thereof comprising providing a device for transport of a material across a biological barrier of a subject comprising: a plurality of microneedles each having a base end and a tip; a substrate to which the base ends of the microneedles are attached or integrated; and a plurality of particles comprising an adipose tissue browning agent and/or fat modulating agent; and administering the device to a subject in need of treating a disease. In one aspect, the methods of treating a disease (such as, for example obesity or diabetes) can reduce the subject's subdermal white adipose tissue.

In some embodiments, "obesity" refers to a body mass index (BMI) of 30 kg/m ² or more (National Institute of Health, Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults (1998)). However, in some embodiments of the present invention, at least in part, is also intended to include a disease, disorder, or condition that is characterized by a body mass index (BMI) of 25 kg/m ² or more, 26 kg/m ² or more, 27 kg/m ² or more, 28 kg/m ² or more, 29 kg/m ² or more, 29.5 kg m ² or more, or 29.9 kg m or more, all of which are typically referred to as overweight (National Institute of Health, Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults (1998) ). The obesity may be due to any cause, whether genetic or environmental. In one embodiment, "treatment of obesity" refers to preventing obesity or an obesity-associated disorder from occurring if the treatment is administered prior to the onset of the obese condition. Moreover, if treatment is commenced in subjects already suffering from or having symptoms of obesity or an obesity-associated disorder, such treatment is expected to prevent, or to prevent the progression of obesity or the obesity-associated disorder.

The term "obesity-associated disorder" includes all disorders associated with or caused at least in part by obesity. Obesity-associated disorders include, for example, diabetes; cardiovascular disease; high blood pressure; deep vein thrombosis; osteoarthritis; obstructive sleep apnea; cancer and non-alcoholic fatty liver disease.

"Type I diabetes" refers to the form of diabetes mellitus resulting from the autoimmune destruction of insulin-producing cells and reduction of the body's ability to produce insulin. The loss of insulin results in increased blood sugar.

"Treat," "treating," "treatment," and grammatical variations thereof as used herein, include the administration of a composition with the intent or purpose of partially or completely preventing, delaying, curing, healing, alleviating, relieving, altering, remedying, ameliorating, improving, stabilizing, mitigating, and/or reducing the intensity or frequency of one or more a diseases or conditions, a symptom of a disease or condition, or an underlying cause of a disease or condition. Treatments according to the invention may be applied preventively, prophylactically, pallatively or remedially. Prophylactic treatments are administered to a subject prior to onset (e.g., before obvious signs of cancer), during early onset (e.g., upon initial signs and symptoms of cancer), or after an established development of cancer. Prophylactic administration can occur for day(s) to years prior to the manifestation of symptoms of an infection.

In one aspect disclosed herein are methods of treating any disease disclosed herein

(such as, for example obesity or diabetes), wherein the administering step b) comprises inserting the plurality of microneedles into a biological barrier. Also disclosed herein are methods of treating any disease disclosed herein (such as, for example obesity or diabetes) wherein the plurality of particles further comprises a pH altering agent and a pH-responsive matrix. In one aspect, the pH altering agent decreases the pH within the nanoparticles, and wherein the decrease in pH degrades the pH-responsive matrix and releases the adipose tissue browning agent and/or fat modulating agent.

Also disclosed herein are methods of treating any disease disclosed herein (such as, for example obesity or diabetes), wherein the administering step b) modulates(for example, increases) expression of one or more brown adipocyte genes (such as, for example Ucpl, Dio2, ElovB, Cidea, Pgc-la, Cox7al, or Cox8b), adiponectin, and/or PPARy target aP2.

In one aspect, disclosed herein are methods of treating any disease disclosed herein (such as, for example obesity or diabetes), wherein the method decreases expression of one or more white adipocyte genes. Also disclosed herein are methods of treating any disease disclosed herein (such as, for example obesity or diabetes), wherein the method increases energy expenditure and fatty acid oxidation of the subject, increases insulin sensitivity and/or avoids significant skin lesions. EXAMPLES

The following examples are set forth below to illustrate the compositions, methods, and results according to the disclosed subject matter. These examples are not intended to be inclusive of all aspects of the subject matter disclosed herein, but rather to illustrate representative methods and results. These examples are not intended to exclude equivalents and variations of the present invention which are apparent to one skilled in the art.

Example 1.

Herein disclosed is a locally induced browning technology which can include a degradable microneedle (MN) patch consisted of drug-loaded nanoparticles (NPs) and a crosslinked matrix (FIG. 1). Rosiglitazone (Rosi) or CL 316243 was loaded in the NPs as the model browning agents. The NPs can be further integrated into a microneedle (MN)-array based transdermal device for sustained drug delivery into subcutaneous adipose tissue. The MN patch provides a localized, convenient and painless administration method. In mouse models, the MN patch locally delivers browning agents in a safe and effective manner for inhibition of adipocyte hypertrophy and consequent improvement of metabolism.

RESULTS AND DISCUSSION

Synthesis and Characterization of Rosi-loaded NPs. Degradable NPs were prepared using an acid-sensitive dextran derivative by a double emulsion method. The acid- sensitive dextran was synthesized through conjugation with ethoxypropene via an acid- catalyzed reaction, which rendered the derived dextran (m-dextran) with 89% substitution of hydroxyl to pendant acetals (FIG. 6). Rosi, an agonist of Peroxisome Proliferator- Activated Receptor gamma (PPARy), stimulates adipose tissue transformation by upregulating uncoupling proteins, VEGF, and angiopoietin-like 4. Rosi was encapsulated in dextran NPs for WAT browning. Two enzymes, glucose oxidase (GOx) and catalase (CAT), were introduced into the system to generate acidic environment under the physiological glucose concentration. GOx is able to convert glucose to gluconic acid to decrease the local pH; while CAT helps consume undesired hydrogen peroxide produced during the GOx-medicated enzymatic reaction. The resulting NPs had spherical shapes with monodisperse distribution, as shown by scanning electron microscopy (SEM) (FIG. 2e). The hydrodynamic particle size was around 250 nm, as determined by dynamic light scattering (DLS) (FIG. 2a). The NPs had a loading capacity of 5.2 weight percent and encapsulated efficiency was around 55 percent. To monitor the release kinetics of Rosi, NPs were incubated in PBS buffer containing glucose at a normoglycemic level (100 mg/dL) in the human body. Then, NPs gradually disassociated in the enzyme-induced acidic environment, triggering release of the encapsulated drug (FIG. 2b). NPs with GOx gradually degraded in 3 days, as shown by the reduction of UV absorbance at 400 nm (FIG. 2d), and subsequently released the embedded drug (FIG. 2c, e). To the contrary, insignificant drug was collected from NPs without GOx.

To validate the efficiency of Rosi NPs, an in vitro adipocyte model PgKO-PPARyl was used in which the reconstitution of a shorter form of PPARy (yl) in Pparg ' ^~ mouse embryonic fibroblast (MEF) rescues adipocyte differentiation only in the presence of exogenous Thiazolidinedione class of ligand (e.g. Rosi). Rosi NPs were as efficient as nude Rosi to induce adipocyte formation, as shown by the same induction of lipid droplet-binding protein genes aP2 and Perilipin (FIG. 2f), both of which are canonical PPARy target genes. In addition to adipogenic potential, the browning capacity of Rosi NPs was also compared. In fully differentiated 3T3-L1 adipocytes, Rosi NPs behaved the same as nude Rosi to up- regulate brown adipocyte markers ElovB and Cidea as well as to repress white adipocyte genes Resistin and Adipsin (FIG. 2g). Therefore, the disclosed nanoparticalization strategy can sustain a constant release of Rosi at physiological levels of glucose without affecting its efficiency.

Fabrication and Characterization of Browning Agent MN-array patch. NPs were embedded into a polymeric MN-array patch for local delivery of browning agents. Briefly, NPs were first loaded into the tip region of a silicone MN-mold by centrifugation, followed by addition of base solution. Methacrylated HA (m-HA) was selected as the base material, considering its good biocompatibility and mechanical properties. The m-HA base solution was mixed with the crosslinker N,N'-methylenebis(acrylamide) (MBA), and a photoinitiator was further crosslinked through a polymerization reaction upon exposure to UV light (365 nm, 9 mW/cm ² for 30s). The crosslinked HA-based matrix can enhance the stiffness of the MNs (FIG. 7) for efficient penetration through the skin, as well as facilitate sustained release of drug from the MN tips, which helps maintain local constitutive high drug concentrations in adipose tissues. The MN-array contained 121 needles in a 7x7 mm ² patch with a center-to-center interval of 600 μιη. Each MN had a conical shape, in which the MN had a base diameter of about 300 μιη and a height of about 800 μιη (FIG. 2i). A zoomed SEM image showed the distribution of NPs in the tip (FIG. 2j).

In Vivo Studies of the MNs on lean mice. The in vivo browning efficacy of the system was examined in a mouse model. In addition to Rosi, a second compound, CL

316243, a β3- adrenergic receptor agonist, was used in dextran NPs and loaded in MNs. CL 316243 is a potent thermogenic activator but works through a distinct mechanism from Rosi. CL 316243 stimulates G protein Gas to activate adenylate cyclase, and consequently causes accumulation of cyclic adenosine monophosphate (cAMP), which leads to thermogenesis and lipolysis. By including this distinctive browning agent, the applicability of the NP system was compared to other drugs. Specifically, wide-type C57BJ/6 mice were randomly divided into three groups (n=6) and treated with the empty vehicle MN (EV) made of only crosslinked m-HA, the HA MN encapsulating Rosi NPs (10 mg/kg body weight (bw)) (Rosi), and the CL 316243 NP-loaded MN (1 mg/kg bw) (CL) at inguinal WAT. MNs penetrated the mouse skin at the inguinal site efficiently, as shown by trypan blue staining of MN-treated tissue (FIG. 21). MN penetration into the skin exposed the MN tips to the inguinal adipose tissue and successfully delivered model drugs into adipocytes, as shown by fluorescence microscopy (FIG. 8). In vivo fluorescence imaging of Cy5.5-labelled non-degradable NPs without GOx loaded MNs verified that NPs were well restricted in the treated skin region during the whole treatment (FIG. 9). An SEM of the MN revealed the collapsed tips after application, further showing complete release of drug (FIG. 2k). The in vivo sustained release within 3 days was also confirmed by in vivo fluorescence imaging. Compared to the rapid release of free Cy5.5-loaded MN patch, the degradable NPs-loaded patch showed excellent sustained release capability (FIG. 10). Mice were treated with MN patches every three days. Six days post-treatment, mice were sacrificed and the inguinal adipose tissues were collected for histological and gene analysis. The hematoxylin and eosin (H&E) staining of inguinal WAT depicted shrinkage of unilocular white adipocytes and appearance of paucilocular adipocytes, the typical morphology of beige adipocyte, in Rosi MN and CL 316243 MN treated groups, particularly the latter (FIG. 3a). Gene expression analyses further showed browning transformation of inguinal WAT by MN delivery of browning agents (FIG. 3b). The representative brown adipocyte genes including Ucpl, Dio2, ElovB, Cidea, Pgc-l a, Cox7al, Cox8b, which are involved in mitochondrial activity and lipid utilization, were up-regulated in both groups, while the inflammatory gene IL-6 tended to be down-regulated. Interestingly, the pan-adipocyte marker Adiponectin was not affected, showing a selective regulation on browning. Notably, the canonical PPARy target aP2 was up-regulated by Rosi MN but not by CL 316243 MN, showing their distinct browning mechanisms.

After establishing the feasibility of the MN approach to induce browning in vivo, the browning effects of Rosi MN and CL 316243 MN were tested for lasting and physiological significance. To this end, Rosi MN- or CL 316243 MN-treated mice together with vehicle MN-treated control mice were exposed to indirect calorimetric analysis to measure their systemic metabolic response. All three groups of mice lost weight during the experiment due to the stress of single-housing, but the CL 316243 MN group tended to lose more weight (FIG. 4a). Increased body weight loss of the CL 316243 MN group arose from reduced fat mass, particularly visceral epididymal WAT (eWAT) (FIG. 4b, c). Changes in energy homeostasis were merely caused by energy expenditure, since neither Rosi MN nor CL 316243 affected calorie intake (FIG. 4d). Strikingly, both treatments increased oxygen consumption (FIG. 4e) as an outcome from induced browning (FIG. 3). Unlike CL 316243 MN, Rosi MN reduced locomotor activity during the dark cycle when mice are more active (FIG. 4f), in line with the distinct browning mechanisms of the two drugs. Furthermore, both Rosi and CL 316243 decreased respiration exchange ratio (RER) (FIG. 4g), as shown by released C02/consumed O2, demonstrating the preference for fatty acid utilization after browning, since only 75% oxygen is needed to fully oxidize carbohydrates compared to fatty acids (3:4 ratio). Taken together, the calorimetric studies show that MN delivery of Rosi or CL 316243 browning agents is an efficient way to induce browning and improve metabolism.

In Vivo Studies of the MNs on Diet-Induced Obese Mice. The physiological effects of MN browning agent patches were striking and encouraging. Thus, the therapeutic potential of MNs in obese mice was evaluated. In high-fat diet (HFD)-induced obesity

C57BL/6 mice, a MN browning agent patch was applied to one side inguinal region (Rosi or CL) and an empty HA MN was applied to the other side as vehicle control (EV-R and EV-C) (FIG. 5a). For control mice, both sides were treated with empty HA MN (EV). Rosi is a potent insulin sensitizer but also causes weight gain. Surprisingly, MN delivery of Rosi also prevented weight gain similar to CL 316243 MN, resulting in a -15% inhibition at the end of the four- week treatment (FIG. 5b). Both Rosi MN and CL 316243 MN efficiently improved glucose clearance rate after injecting mice with a bolus of glucose in intraperitoneal glucose tolerance testing (IPGTT) (FIG. 5c), and decreased fasting blood glucose levels (the diagnostic indicator of diabetes) from 140 mg/dL in control mice to -110 mg/dL (FIG. 5d), indicating an improvement of insulin sensitivity. Intriguingly, this improvement in insulin sensitivity was caused by browning rather than by the insulin sensitizing function of Rosi itself, since CL 316243 showed the same effect. As a consequence of increased browning and lipid utilization shown in FIG. 4, a -30% reduction of eWAT (FIG. 5e) but not in the classic interscapular BAT (FIG. 5f) was observed. More importantly, MN delivery of browning agents reduced inguinal fat pad locally. The sizes of treated sides, either by Rosi MN or CL 316243 MN, were reduced compared to untreated sides (EV-R or EV-C) (FIG. 5g, h). H&E stained sections showed smaller adipocytes in inguinal WAT only in the mice administered with drug-containing patches, but no obvious browning was observed at the other site administered with empty control patches (FIG. 5i). Brown adipocyte genes were more highly induced in the treated side, particularly by Rosi MN (FIG. 5j), showing a restricted browning effect of MN patches. The gene Adiponectin was up-regulated in both Rosi MN and CL 316243 MN treated sites (FIG. 5j), showing improved adipose health. The PPARy downstream target aP2 was induced only by MN Rosi (FIG. 5j), further showing a local effect of the MN patch. H&E stained histological images of mouse skin surrounding MN-treated areas after one-month administration showed insignificant lesions in the skin, demonstrating excellent biocompatibility of the MN patches (FIG. 11).

CONCLUSIONS

Disclosed herein is a technique based on a NP-integrated microneedle patch that facilitates local browning of WAT. The degradable NPs released browning agents into the subcutaneous region in the presence of glucose and facilitated transformation of WAT towards brown-like adipose tissue. Importantly, MNs restricted browning agents to the treated region and thus minimize potential side effects on other organs of systemically (e.g. orally or intravenously) administered browning agents. In vivo data further demonstrated systemically increased energy expenditure and fatty acid oxidation, effective body weight control in diet-induced obese mice, and improved insulin sensitivity. Taken together, provided herein is an alternative strategy in administering drugs through MN as potential therapeutics for clinical treatment of obesity and its comorbidities such as type-2 diabetes.

METHODS

Materials. All chemicals were purchased from Sigma- Aldrich unless otherwise specified and were used as received. Rosiglitazone was ordered from Abeam (Cambridge, MA, USA). CL 316243 was purchased from Cayman Chemical (Ann Arbor, MI, USA). Deionized water was prepared by a Millipore NanoPure purification system (resistivity higher than 18.2 ΜΩ cm ¹ ).

Preparation of rosiglitazone-loaded dextran nanoparticles. Dextran nanoparticles (NPs) were prepared by an improved double emulsion method. Briefly, 5 mL

dichloromethane (DCM) containing 200 mg of m-dextran and 20 mg rosiglitazone (Rosi) were emulsified with 0.5 mL of aqueous solution containing 3.5 mg of enzymes (weight ratio of glucose oxidase to catalase 4: 1) by sonication for 45 cycles (1 s each with a duty of 40%). The resulting primary solution was further poured into 25 mL 1 % alginate aqueous solution (Mv = 1.6xl0 ⁵ Da) for another 45-cycle sonication. The double emulsion was immediately transferred into 150 mL 0.2% alginate and stirred at room temperature for 2 h to evaporate DCM. Afterwards, nanoparticles were collected by centrifugation at 10,000 rpm and washed by distilled water three times. The loading capacity (LC) and encapsulation efficiency (EE) of Rosi were determined by measuring UV-Vis absorption of released Rosi from

nanoparticles using a Nanodrop 2000C spectrometer (Thermo Scientific) at absorbance 317 nm. LC and EE were calculated as LC = B/C, EE = B/A, where A was the expected encapsulated amount of Rosi, B was the encapsulated amount of Rosi, and C was the total weight of the particles. Particle size and polydispersity intensity were measured by dynamic light scattering (DLS). The zeta potential of NPs was determined by their electrophoretic mobility using the same instrument after appropriate dilution in DI water. Measurements were made in triplicate at room temperature. NPs morphology was investigated by a FEI Verios 460L field-emission scanning electron microscope (FESEM).

In vitro release studies. The in vitro release profile of Rosi from dextran nanoparticles was evaluated through incubation of nanoparticles in 1 mL PBS buffer (NaCl, 137 mM; KC1, 2.7 mM; Na ₂ HP0 ₄ , 10 mM; KH ₂ P0 ₄ , 2 mM; pH 7.4) at 37°C on an orbital shaker, to which 100 mg/dL glucose was added to reach normoglycemic level in human body. At predetermined time points, the sample was centrifuged (10,000 rpm, 1 min) and 10 μΐ _^ the supernatant was taken out for analysis by measuring the UV-Vis absorbance at 317 nm using a Nanodrop 2000C spectrometer. Fabrication of browning agent microneedle (MN) patch. Each MN was fabricated using the uniform silicone molds from Blueacre Technology Ltd. Each needle had a 300 μιη by 300 μιη round base tapering to a height of 800 μιη. Needles were arranged in an 11x11 array with 600 μιη tip-to-tip spacing. To fabricate nanoparticles-loaded microneedles, the prepared nanoparticle suspension was first deposited by pipet onto the MN mold surface (30 pL/array). Then, molds were placed under vacuum (600 mmHg) for 5 min to allow the solution filled the MN cavities. Afterwards, the covered molds were centrifuged using a Hettich Universal 32R centrifuge for 10 min at 2,000 rpm. Finally, 3 mL premixed N,N'- methylenebisacrylamide (MBA, w/v: 2%), photoinitiator (Irgacure 2959, w/v: 0.5%) and m- HA solution (w/v: 4%) were added into the prepared micromold reservoir and allowed to dry at 20°C under vacuum desiccator. m-HA was synthesized following a previous reported method. After complete desiccation, the ΜΝ patch was carefully detached from the silicone mold and underwent crosslinking polymerization via UV irradiation (wavelength: 365 nm at an intensity of 9 mW/cm ² ) for 30 s. The resulting MN-array patches were stored in a sealed six well container. Morphology of MNs was characterized via a FEI Verios 460L field- emission scanning electron microscope (FESEM).

In vivo browning studies in lean mice. 8-week old male C57BL/6 mice ordered from Charles River (Raleigh, NC, USA) or the Jackson Laboratory were used. The animal study protocols were approved by the Institutional Animal Care and Use Committee at North Carolina State University and University of North Carolina at Chapel Hill, or by the

Columbia University Animal Care and Utilization Committee. Mice were caged at 22+l°C with free access to water and regular chow diet on a 12 h light/dark cycle. Mice were given least one-week adaption before experiments. Three groups of animals (n=6) were treated with empty hyaluronic acid (HA) MN patch (EV), Rosi NP-loaded MN patch (10 mg/kg) (Rosi), or CL316243 NP-loaded MN patch (1 mg/kg) (CL) on inguinal regions every three days. For indirect calorimetric studies, mice were subjected to the Comprehensive Lab Animal Monitoring System (CLAMS). Metabolic activities were monitored during treatment, including oxygen consumption, food intake, locomotor activity and body weight. Six days post-administration, animals were sacrificed and inguinal adipose tissues were collected for histological and RNA analysis. Interscapular browning adipose tissues (BAT) and epididymal white adipose tissues (WAT) were weighted. Browning MN patch treatments on diet induced obesity (DIO) mice. Male

C57BL/6 mice were fed a high-fat diet (HFD; 60% kcal from fat) for 8 weeks to induce obesity and insulin resistance. Three groups of five mice each were treated with empty HA, Rosi (10 mg/kg), or CL316243 (1 mg/kg) through a transdermal patch on one side of the inguinal areas under isoflurane anesthesia. The other side of inguinal tissue of each mouse was treated with an empty HA microneedle patch. Each patch was changed every 3 days for 4 weeks. Body weight was monitored during the treatment period. The glucose tolerance test was performed in mice 3-weeks post-treatment. Mice fasted for 16 h (overnight) before glucose administration. Mice were intraperitoneal injected with glucose (2 g/kg diluted in PBS) and blood glucose levels were monitored over time. At the end of 4- weeks of MN treatment, mice were euthanized by CO2 asphyxiation, and adipose tissues (inguinal WAT, epididymal WAT, and interscapular BAT) were collected for analyses. The skin tissues around the treated areas were also collected for biocompatibility evaluation of MN patches.

Synthesis of pendant acetal-modified dextran (m -dextran). 1.0 g of dextran (Mn=9~\ lkDa) was added to a flame-dried round-bottom flask and purged with nitrogen. 10 mL of anhydrous dimethyl sulfoxide (DMSO) was added to the flask and stirred until complete dissolution of the dextran. Pyridinium p-toluenesulfonate (PPTS, 15.6 mg, 0.062 mmol) was added to the solution followed by the addition of 2-ethoxypropene (4.16 mL, 37 mmol). The reaction mixture was purged with nitrogen and sealed with parafilm to prevent reactant evaporation. The reaction was stirred at room temperature for 30 min, and then quenched by the addition of 1 mL of triethylamine. The mixture was then precipitated and washed three times in basic water (pH ~8) to prevent undesired degradation and collected by centrifugation at 8,000 rpm for 15 min. The product was lyophilized to obtain white solid. 1H NMR (DMSO-de, 300 MHz, δ ppm): 1.10 (m, OCH2CH3), 1.30 (m, C(CH ₃ ) ₂ ), 3.40 (m, OCH2CH3), 3.55-3.85 (br, dextran C ₂ -H ~ C ₆ -H), 4.88 (br, dextran Ci-H)

Mechanical strength test. Mechanical strength of MNs was measured by pressing MNs against a stainless-steel plate. The speed of the top stainless-steel plate movement towards the MN-array patch was 1 μιη/s. Skin penetration efficiency test. After administering the MN-array on skin at the inguinal site, mice were euthanized by CO2 asphyxiation, and skin was excited and stained with trypan blue for imaging by optical microscopy (Leica EZ4 D stereo microscope). To evaluate the biocompatibility of the MN-array patches, the tissue samples were fixed in 10% formalin for 18 h and then embedded in paraffin, cut into 50 μιη sections, and stained using hematoxylin and eosin (H&E) for histological analysis.

RNA analysis. RNA was extracted from tissues or cells by combining TriZol reagent and NucleoSpin RNA kit with DNase I digestion (Macherey-Nagel), following the manufacturer's instructions. 1 μg total RNA was used to synthesize cDNA by using the High-capacity cDNA Reverse Transcription kit (Applied Biosystems). Quantitative real-time PCR (Q-PCR) were performed on a Bio-Rad CFX96 Real-Time PCR platform by using the GoTaq qPCR Master Mix (Promega). Relative gene expressions were calculated by using AACt method with Cyclophilin A (cultured cells) or RPL23 (tissues) as the reference gene. Primer sequences are listed in Table 1.

Table 1. List of Q-PCR DNA Primer sequences.

Gene Q-PCR Primer sequence Sequence ID NO:

Adipsin Forward: CATGCTCGGCCCTACATGG SEQ ID NO: 1

Reverse: CACAGAGTCGTCATCCGTCAC SEQ ID NO: 2

Adiponectin Forward: GCACTGGCAAGTTCTACTGCAA SEQ ID NO: 3

Reverse: GTAGGTGAAGAGAACGGCCTTGT SEQ ID NO: 4 aP2 Forward: ACACCGAGATTTCCTTCAAACTG SEQ ID NO: 5

Reverse: CCATCTAGGGTTATGATGCTCTTCA SEQ ID NO: 6

Cidea Forward: TGCTCTTCTGTATCGCCCAGT SEQ ID NO: 7

Reverse: GCCGTGTTAAGGAATCTGCTG SEQ ID NO: 8

Cox7al Forward: CAGCGTCATGGTCAGTCTGT SEQ ID NO: 9

Reverse: AGAAAACCGTGTGGCAGAGA SEQ ID NO: 10

Cox8b Forward: GAACCATGAAGCCAACGACT SEQ ID NO: 11

Reverse: GCGAAGTTCACAGTGGTTCC SEQ ID NO: 12

Cyclophilin A Forward: TATCTGCACTGCCAAGACTGAGTG SEQ ID NO: 13 Reverse: CTTCTTGCTGGTCTTGCCATTCC SEQ ID NO: 14

Dio2 Forward: AGAGTGGAGGCGCATGCT SEQ ID NO: 15

Reverse: GGCATCTAGGAGGAAGCTGTTC SEQ ID NO: 16

ElovB Forward: CCAACAACGATGAGCAACAG SEQ ID NO: 17

Reverse: CGGGTTAAAAATGGACCTGA SEQ ID NO: 18

IL-6 Forward: TTCCATCCAGTTGCCTTCTT SEQ ID NO: 19

Reverse: ATTTCCACGATTTCCCAGAG SEQ ID NO: 20

Perilipin Forward: GGCCTGGACGACAAAACC SEQ ID NO: 21

Reverse: CAGGATGGGCTCCATGAC SEQ ID NO: 22

Pgc-la Forward: CCCTGCCATTGTTAAGACC SEQ ID NO: 23

Reverse: TGCTGCTGTTCCTGTTTTC SEQ ID NO: 24

Pparyl Forward: AGAAGCGGTGAACCACTGAT SEQ ID NO: 25

Reverse: GAATGCGAGTGGTCTTCCAT SEQ ID NO: 26

PparjZ Forward: TCTGGGAGATTCTCCTGTTGA SEQ ID NO: 27

Reverse: GGTGGGCCAGAATGGCATCT SEQ ID NO: 28

Prdml6 Forward: TGGCCTTCATCACCTCTCTGAA SEQ ID NO: 29

Reverse: TTTCTGATCCACGGCTCCTGTGA SEQ ID NO: 30

Resistin Forward: AAGAACCTTTCATTTCCCCTCCT SEQ ID NO: 31

Reverse: GTCCAGCAATTTAAGCCAATGTT SEQ ID NO: 32

Rpl23 Forward: TGTCGAATTACCACTGCTGG SEQ ID NO: 33

Reverse: CTGTGAAGGGAATCAAGGGA SEQ ID NO: 34

Ucpl Forward: ACTGCCACACCTCCAGTCATT SEQ ID NO: 35

Reverse: CTTTGCCTCACTCAGGATTGG SEQ ID NO: 36

Statistical analysis. All results are presented as Mean + SEM or Mean + SD. Statistical analysis was performed using Student's i-test. With a p value < 0.05, the differences between experimental groups and control groups were considered statistically significant.

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