Methods of treating, preventing, or inhibiting inflammation with Mactanamide compounds

SUMMARY OF THE INVENTION

[0003] 1. Field of the Invention

[0004] This invention relates generally to diketopiperazines. In particular, the present invention relates to methods of treating, preventing, or inhibiting inflammation in a subject comprising administering a diketopiperazine, a Mactanamide compound, to a subject.

[0005] 2. Description of the Related Art

[0006] Diketopiperazines are common naturally occurring peptide derivatives. They may be isolated from cultures of yeast, lichen, and fungi or they may be chemically synthesized. The diketopiperazine ring system is found in a variety of compounds which exhibit medicinal utility as dopamine agonists, antibiotics, platelet-activating factor antagonists, inhibitors of plasminogen activator inhibitor, and anti-proliferative agents.

[0007] For example, U.S. Pat. Nos. 5,700,804 and 5,902,812 disclose diketopiperazines of the formula:

[0008] wherein the benzyl rings may include substituents as inhibitors of the plasminogen activator inhibitor (PAI) and for treating thrombic diseases, myocardial infarction, deep vein thrombosis, and disseminated intravascular coagulation.

[0009] Similarly, U.S. Pat. Nos. 5,891,877 and 5,750,530 disclose diketopiperazines of the formula:

[0010] for treating thrombic diseases, myocardial infarction, deep vein thrombosis, and disseminated intravascular coagulation.

[0011] U.S. Pat. No. 5,817,751, discloses a method for synthesizing a variety of diketopiperazines which have a substituent on a nitrogen of the piperazine ring. U.S. Pat. No. 6,069,146, a diketopiperazine that was isolated from a marine fungus and exhibits anti-proliferative activity.

[0012] Recently, it has been found that a compound having a diketopiperazine ring structure, Mactanamide, exhibits superior anti-inflammatory properties. Thus, the present invention relates to Mactanamide compounds and methods of making and using thereof.

SUMMARY OF THE INVENTION

[0013] The present invention generally relates to Mactanamide compounds and methods of using to treat, prevent, or inhibit inflammation.

[0014] In some embodiments, the present invention relates to a composition comprising at least one Mactanamide compound having the following Structural Formula A Structural Formula A

[0015] wherein R1 is H, alkyl, aryl, or alkoxyl; R2 and R3 are each independently H, alkyl, hydroxyl or alkoxyl; and a pharmaceutically or cosmetically acceptable excipient. In preferred embodiments, R1 is H, and R2 and R3 are hydroxyl. The composition may further include a supplementary active compound such as an anti-inflammatory agent or an analgesic. In some embodiments, the composition is in a formulation suitable for topical administration. In some embodiments, the Mactanamide compound lacks anti-proliferative activity.

[0016] In some embodiments, the present invention relates to a method of treating, preventing, or inhibiting inflammation or an inflammatory disease or disorder in a subject comprising administering to the subject at least one Mactanamide compound having the following Structural Formula

[0017] wherein R1 is H, alkyl, aryl, or alkoxyl; R2 and R3 are each independently H, alkyl, hydroxyl, or alkoxyl; and a pharmaceutically or cosmetically acceptable excipient. In preferred embodiments, R1 is H, and R2 and R3 are hydroxyl. The method may further comprise administering to the subject a supplementary active compound such as an anti-inflammatory or an analgesic. The Mactanamide compound may be topically administered. The inflammatory disease or disorder may be acute or chronic inflammation. The inflammatory disease or disorder may be an inflammation of the skin such as psoriasis or eczema. The inflammation may be the result of immunogenic or neurogenic inflammation. The Mactanamide compound may lack anti-proliferative activity.

[0018] In some embodiments, the present invention relates to a kit comprising at least one Mactanamide compound and directions for use.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the invention as claimed. The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute part of this specification, illustrate several embodiments of the invention and together with the description serve to explain the principles of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0020] Recently, a fungistatic diketopiperazine, named Mactanamide, was isolated from the mycelium of a marine fungus of the genus Aspergillus near Mactan Island, Philippines. See Fenical, et al. (1998) Natural Product Letts. 12:55-60, which is herein incorporated by reference. Mactanamide has the following structural formula:

[0021] As provided in the Examples below, Mactanamide reduced inflammation by about 93% in mouse ear edema assays. Specifically, 25 μg/ear of Mactanamide applied in combination with phorbol 12-myristate 13-acetate (PMA) inhibited PMA-induced inflammation (edema) of the mouse ear by about 83.7% as compared to controls and 50 μg/ear of Mactanamide applied in combination with resiniferatoxin (RTX) inhibited RTX-induced inflammation (edema) of the mouse ear by about 92.6% as compared to controls.

[0022] Therefore, the present invention provides methods of treating, preventing, or inhibiting inflammation or diseases and disorders associated with inflammation in a subject which comprises administering to the subject at least one Mactanamide compound. In particular, the present invention provides a method of treating, preventing, or inhibiting inflammation or an inflammatory disease or disorder in a subject which comprises administering to the subject at least one Mactanamide compound.

[0023] As used herein, a “Mactanamide compound” refers to a compound having the following Structural Formula A as a backbone or scaffold:

[0024] wherein R1 is H, alkyl, aryl, or alkoxyl, preferably H or methyl; and

[0025] R1 and R3 are each independently H, alkyl, hydroxyl, or alkoxyl, preferably R2 and R3 are hydroxyl.

[0026] In a preferred embodiments, the Mactanamide compound is Mactanamide wherein R1 is H, R2 and R3 are hydroxyl.

[0027] The Mactanamide compounds may be synthesized or purified from natural sources. The Mactanamide compounds of the present invention may be prepared using reaction routes, synthesis schemes and techniques available in the art using starting materials that are readily available. Mactanamide compounds of the present invention may be obtained by conventional methods known in the art. In preferred embodiments, the Mactanamide compounds of the present invention are obtained by culturing the marine fungal strain, CNC688, in YPG, a marine-based medium, comprising 1% glucose, 0.5% yeast extract, 0.5% peptone, 0.2% crab meal, and seawater. Then the mycelium is filtered, freeze-dried, and extracted with 1:1 DCD:MeOH. The crude extract is concentrated and then subjected to flash Sephadex LH20 chromatography and silica column chromatography. See Fenical, et al. However, it should be noted that the Mactanamide compounds of the present invention may be made other methods known in the art.

[0028] The terms and abbreviations used in the instant disclosure have their normal meanings unless otherwise designated. As used in the present application, the following definitions apply:

[0029] As used herein, “inflammatory diseases and disorders” and “diseases or disorders associated with inflammation” are used interchangeably to include diseases and disorders resulting in or resulting from acute or chronic inflammation. Examples of such inflammatory diseases and disorders include inflammation of the skin such as psoriasis and eczema, osteoarthritis, rheumatoid arthritis, colitis, and Crohn's disease.

[0030] In accordance with a convention used in the art,

[0031] is used in structural formulas herein to depict the bond that is the point of attachment of the moiety or substituent to the core or backbone structure.

[0032] Where chiral carbons are included in chemical structures, unless a particular orientation is depicted, both sterioisomeric forms are intended to be encompassed.

[0033] An “alkyl” is intended to mean a straight or branched chain monovalent radical of saturated and/or unsaturated carbon atoms and hydrogen atoms, such as methyl (Me), ethyl (Et), propyl (Pr), isopropyl (i-Pr), butyl (Bu), isobutyl (i-Bu), t-butyl (t-Bu), ethenyl, pentenyl, butenyl, propenyl, ethynyl, butynyl, propynyl, pentynyl, hexynyl, and the like, which may be unsubstituted (i.e., contain only carbon and hydrogen) or substituted by one or more suitable sustituents as defined below (e.g., one or more halogen, such as F, Cl, Br, or I, with F and Cl being preferred). A “lower alkyl group” is intended to mean an alkyl group having from 1 to 8 carbon atoms in its chain.

[0034] A “cycloalkyl” is intended to mean a non-aromatic monovalent monocyclic, bicyclic, or tricyclic radical comprising 3-14 carbon ring atoms, each of which may be saturated or unsaturated, and which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more heterocycloalkyl groups, aryl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more substituents. Illustrative examples of cycloalkyl groups include the following moieties:

[0035] A “heterocycloalkyl” is intended to mean a non-aromatic monovalent monocyclic, bicyclic, or tricyclic radical, which is saturated or unsaturated, comprising 3-18 ring members, which includes 1-5 heteroatoms selected from nitrogen, oxygen, and sulfur, where the radical is unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, aryl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of heterocycloalkyl groups include the following moieties:

[0036] An “aryl” is intended to mean an aromatic monovalent monocyclic, bicyclic, or tricyclic radical comprising 6, 10, 14, or 18 carbon ring members, which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, heterocycloalkyl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Thus, the term “aryl group” includes a benzyl group (Bzl). Illustrative examples of aryl groups include the following moieties:

[0037] A “heteroaryl” is intended to mean an aromatic monovalent monocyclic, bicyclic, or tricyclic radical comprising 4-18 ring members, including 1-5 hetero atoms selected from nitrogen, oxygen, and sulfur, which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, heterocycloalkyl groups, or aryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of heteroaryl groups include the following moieties:

[0038] A “heterocycle” is intended to mean a heteroaryl or heterocycloalkyl group (each of which, as defined above, are optionally substituted).

[0039] The terms “aryl” (Ar) and “heteroaryl” refer to monocyclic and polycyclic unsaturated or aromatic ring structures, with “aryl” referring to those that are carbocycles and “heteroaryl” referring to those that are heterocycles. Examples of aromatic ring structures include phenyl, naphthyl, 1,2,3,4-tetrahydronaphthyl, furyl, thienyl, pyrrolyl, pyridyl, pyridinyl, pyrazolyl, imidazolyl, pyrazinyl, pyridazinyl, 1,2,3-triazinyl, 1,2,4-oxadiazolyl, 1,3,4-oxadiazolyl, 1-H-tetrazol-5-yl, indolyl, quinolinyl, benzofuranyl, benzothiophenyl (thianaphthenyl), and the like.

[0040] An “acyl” is intended to mean a —C(O)—Ra radical, where Ra is a suitable substituent as defined below.

[0041] A “thioacyl” is intended to mean a —C(S)—Ra radical, where Ra is a suitable substituent as defined below.

[0042] A “sulfonyl” is intended to mean a —SO2Ra radical, where Ra is a suitable substituent as defined below.

[0043] A “hydroxyl” is intended to mean the radical —OH.

[0044] An “amino” is intended to mean the radical —NH2.

[0045] An “alkylamino” is intended to mean the radical —NHRa, where Ra is an alkyl group.

[0046] A “dialkylamino” is intended to mean the radical —NRaRb, where Ra and Rb are each independently an alkyl group.

[0047] An “alkoxyl” is intended to mean the radical —ORa, where Ra is an alkyl group. Exemplary alkoxyl groups include methoxyl, ethoxyl, propoxyl, and the like.

[0048] An “alkoxycarbonyl” is intended to mean the radical —C(O)ORa, where Ra is an alkyl group.

[0049] An “alkylsulfonyl” is intended to mean the radical —SO2Ra, where Ra is an alkyl group.

[0050] An “alkylaminocarbonyl” is intended to mean the radical —C(O)NHRa, where Ra is an alkyl group.

[0051] A “dialkylaminocarbonyl” is intended to mean the radical —C(O)NRaRb, where Ra and Rb are each independently an alkyl group.

[0052] A “mercapto” is intended to mean the radical —SH.

[0053] An “alkylthio” is intended to mean the radical —SRa, where Ra is an alkyl group.

[0054] A “carboxyl” is intended to mean the radical —C(O)OH.

[0055] A “carbamoyl group” is intended to mean the radical —C(O)NH2.

[0056] An “aryloxyl” is intended to mean the radical —ORc, where Rc is an aryl group.

[0057] A “heteroaryloxyl” is intended to mean the radical —Rd, where Rd is a heteroaryl group.

[0058] An “arylthio” is intended to mean the radical —SRc, where Rc is an aryl group.

[0059] A “heteroarylthio” is intended to mean the radical —SRd, where Rd is a heteroaryl group.

[0060] A “leaving group” (Lv) is intended to mean any suitable group that will be displaced by a substitution reaction. One of ordinary skill in the art will know that any conjugate base of a strong acid can act as a leaving group. Illustrative examples of suitable leaving groups include, but are not limited to, —F, —Cl, —Br, alkyl chlorides, alkyl bromides, alkyl iodides, alkyl sulfonates, alkyl benzenesulfonates, alkyl p-toluenesulfonates, alkyl methanesulfonates, triflate, and any groups having a bisulfate, methyl sulfate, or sulfonate ion.

[0061] A “protecting group” is intended to refer to groups that protect one or more inherent functional group from premature reaction. Suitable protecting groups may be routinely selected by those skilled in the art in light of the functionality and particular chemistry used to construct the compound. Examples of suitable protecting groups are described, for example, in Greene and Wuts, Protective Groups in Organic Synthesis, 3rd edition, John Wiley and Sons, New York, N.Y. (1999).

[0062] The term “suitable organic moiety” is intended to mean any organic moiety recognizable, such as by routine testing, to those skilled in the art as not adversely affecting the inhibitory activity of the inventive compounds. Illustrative examples of suitable organic moieties include, but are not limited to, hydroxyl groups, alkyl groups, oxo groups, cycloalkyl groups, heterocycloalkyl groups, aryl groups, heteroaryl groups, acyl groups, sulfonyl groups, mercapto groups, alkylthio groups, alkoxyl groups, carboxyl groups, amino groups, alkylamino groups, dialkylamino groups, carbamoyl groups, arylthio groups, heteroarylthio groups, and the like.

[0063] In general, the various moieties or functional groups for variables in the formulae may be “optionally substituted” by one or more suitable “substituents”. The term “substituent” or “suitable substituent” is intended to mean any suitable substituent that may be recognized or selected, such as through routine testing, by those skilled in the art. Illustrative examples of useful substituents are those found in the exemplary compounds that follow, as well as halogen (chloro, iodo, bromo, or fluoro); C1-6-alkyl; C1-6-alkenyl; C1-6-alkynyl; hydroxyl; C1-6 alkoxyl; amino; nitro; thiol; thioether; imine; cyano; amido; phosphonato; phosphine; carboxyl; carbonyl; aminocarbonyl; thiocarbonyl; sulfonyl; sulfonamine; sulfonamide; ketone; aldehyde; ester; oxygen (═O); haloalkyl (e.g., trifluoromethyl); carbocyclic cycloalkyl, which may be monocyclic or fused or non-fused polycyclic (e.g., cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl), or a heterocycloalkyl, which may be monocyclic or fused or non-fused polycyclic (e.g., pyrrolidinyl, piperidinyl, piperazinyl, morpholinyl, or thiazinyl); carbocyclic or heterocyclic, monocyclic or fused or non-fused polycyclic aryl (e.g., phenyl, naphthyl, pyrrolyl, indolyl, furanyl, thiophenyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, triazolyl, tetrazolyl, pyrazolyl, pyridinyl, quinolinyl, isoquinolinyl, acridinyl, pyrazinyl, pyridazinyl, pyrimidinyl, benzimidazolyl, benzothiophenyl, or benzofuranyl); amino (primary, secondary, or tertiary); nitro; thiol; thioether, O-lower alkyl; O-aryl, aryl; aryl-lower alkyl; CO2CH3; CONH2; OCH2CONH2; NH2; SO2NH2; OCHF2; CF3; OCF3; and the like. Such moieties may also be optionally substituted by a fused-ring structure or bridge, for example OCH2—O. All of these substituents may optionally be further substituted with a substituent selected from groups such as hydroxyl groups, halogens, oxo groups, alkyl groups, acyl groups, sulfonyl groups, mercapto groups, alkylthio groups, alkyloxyl groups, cycloalkyl groups, heterocycloalkyl groups, aryl groups, heteroaryl groups, carboxyl groups, amino groups, alkylamino groups, dialkylamino groups, carbamoyl groups, aryloxyl groups, heteroaryloxyl groups, arylthio groups, heteroarylthio groups, and the like.

[0064] The term “optionally substituted” is intended to expressly indicate that the specified group is unsubstituted or substituted by one or more suitable substituents, unless the optional substituents are expressly specified, in which case the term indicates that the group is unsubstituted or substituted with the specified substituents. As defined above, various groups may be unsubstituted or substituted (i.e., they are optionally substituted) unless indicated otherwise herein (e.g., by indicating that the specified group is unsubstituted).

[0065] It is understood that while a compound of the general structural formulas herein may exhibit the phenomenon of tautomerism, the structural formulas within this specification expressly depict only one of the possible tautomeric forms. It is therefore to be understood that the structural formulas herein are intended to represent any tautomeric form of the depicted compound and is not to be limited merely to a specific compound form depicted by the structural formulas.

[0066] It is also understood that the structural formulas are intended to represent any configurational form of the depicted compound and is not to be limited merely to a specific compound form depicted by the structural formulas.

[0067] Some of the Mactanamide compounds may exist as single stereoisomers (i.e., essentially free of other stereoisomers), racemates, or mixtures of enantiomers, diastereomers, or both. All such single stereoisomers, racemates and mixtures thereof are intended to be within the scope of the present invention. Preferably, the inventive compounds that are optically active are used in optically pure form.

[0068] As generally understood by those skilled in the art, an optically pure compound having one chiral center (i.e., one asymmetric carbon atom) is one that consists essentially of one of the two possible enantiomers (i.e., is enantiomerically pure), and an optically pure compound having more than one chiral center is one that is both diastereomerically pure and enantiomerically pure. Preferably, if the compounds of the present invention are made synthetically, they are used in a form that is at least 90% optically pure, that is, a form that comprises at least 90% of a single isomer (80% enantiomeric excess (e.e.) or diastereomeric excess (d.e.), more preferably at least 95% (90% e.e. or d.e.), even more preferably at least 97.5% (95% e.e. or d.c.), and most preferably at least 99% (98% e.e. or d.e.).

[0069] Additionally, the structural formulas herein are intended to cover, where applicable, solvated as well as unsolvated forms of the compounds. A “solvate” is intended to mean a pharmaceutically acceptable solvate form of a specified compound that retains the biological effectiveness of such compound. Examples of solvates include compounds of the invention in combination with water, isopropanol, ethanol, methanol, dimethyl sulfoxide, ethyl acetate, acetic acid, ethanolamine, or acetone. Also included are miscible formulations of solvate mixtures such as a compound of the invention in combination with an acetone and ethanol mixture. In a preferred embodiment, the solvate includes a compound of the invention in combination with about 20% ethanol and about 80% acetone. Thus, the structural formulas include compounds having the indicated structure, including the hydrated as well as the non-hydrated forms.

[0070] As indicated above, the compounds of the invention also include active tautomeric and stereoisomeric forms of the Mactanamide compounds, which may be readily obtained using techniques known in the art. For example, optically active (R) and (S) isomers may be prepared via a stereospecific synthesis, e.g., using chiral synthons and chiral reagents, or racemic mixtures may be resolved using conventional techniques.

[0071] Additionally, the compounds of the invention include pharmaceutically acceptable salts, multimeric forms, prodrugs, active metabolites, precursors and salts of such metabolites of the Mactanamide compounds of the present invention.

[0072] The term “pharmaceutically acceptable salts” refers to salt forms that are pharmacologically acceptable and substantially non-toxic to the subject being treated with the compound of the invention. Pharmaceutically acceptable salts include conventional acid-addition salts or base-addition salts formed from suitable non-toxic organic or inorganic acids or inorganic bases. Exemplary acid-addition salts include those derived from inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, sulfamic acid, phosphoric acid, and nitric acid, and those derived from organic acids such as p-toluenesulfonic acid, methanesulfonic acid, ethane-disulfonic acid, isethionic acid, oxalic acid, p-bromophenylsulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid, 2-acetoxybenzoic acid, acetic acid, phenylacetic acid, propionic acid, glycolic acid, stearic acid, lactic acid, malic acid, tartaric acid, ascorbic acid, maleic acid, hydroxymaleic acid, glutamic acid, salicylic acid, sulfanilic acid, and fumaric acid. Exemplary base-addition salts include those derived from ammonium hydroxides (e.g., a quaternary ammonium hydroxide such as tetramethylammonium hydroxide), those derived from inorganic bases such as alkali or alkaline earth-metal (e.g., sodium, potassium, lithium, calcium, or magnesium) hydroxides, and those derived from non-toxic organic bases such as basic amino acids.

[0073] The term “multimer” refers to multivalent or multimeric forms of active forms of the compounds of the invention. Such “multimers” may be made by linking or placing multiple copies of an active compound in close proximity to each other, e.g., using a scaffolding provided by a carrier moiety. Multimers of various dimensions (i.e., bearing varying numbers of copies of an active compound) may be tested to arrive at a multimer of optimum size with respect to receptor binding. Provision of such multivalent forms of active receptor-binding compounds with optimal spacing between the receptor-binding moieties may enhance receptor binding. See, for example, Lee et al., (1984) Biochem. 23:4255. The artisan may control the multivalency and spacing by selection of a suitable carrier moiety or linker units. Useful moieties include molecular supports comprising a multiplicity of functional groups that can be reacted with functional groups associated with the active compounds of the invention. A variety of carrier moieties may be used to build highly active multimers, including proteins such as BSA (bovine serum albumin) or HSA, peptides such as pentapeptides, decapeptides, pentadecapeptides, and the like, as well as non-biological compounds selected for their beneficial effects on absorbability, transport, and persistence within the target organism. Functional groups on the carrier moiety, such as amino, sulfhydryl, hydroxyl, and alkylamino groups, may be selected to obtain stable linkages to the compounds of the invention, optimal spacing between the immobilized compounds, and optimal biological properties.

[0074] “A pharmaceutically acceptable prodrug” is a compound that may be converted under physiological conditions or by solvolysis to the specified compound or to a pharmaceutically acceptable salt of such compound. “A pharmaceutically active metabolite” is intended to mean a pharmacologically active product produced through metabolism in the body of a specified compound or salt thereof. Prodrugs and active metabolites of a compound may be identified using routine techniques known in the art. See, e.g., Bertolini, G. et al., (1997) J. Med. Chem. 40:2011-2016; Shan, D. et al., J. Pharm. Sci., 86(7):765-767; Bagshawe K., (1995) Drug Dev. Res. 34:220-230; Bodor, N., (1984) Advances in Drug Res. 13:224-331; Bundgaard, H., Design of Prodrugs (Elsevier Press, 1985); and Larsen, I. K., Design and Application of Prodrugs, Drug Design and Development (Krogsgaard-Larsen et al., eds., Harwood Academic Publishers, 1991).

[0075] If the Mactanamide compound is a base, the desired pharmaceutically acceptable salt may be prepared by any suitable method available in the art, for example, treatment of the free base with an inorganic acid, such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, or with an organic acid, such as acetic acid, maleic acid, succinic acid, mandelic acid, fumaric acid, malonic acid, pyrvic acid, oxalic acid, glycolic acid, salicylic acid, a pyranosidyl acid, such as glucuronic acid or galacturonic acid, an alpha-hydroxy acid, such as citric acid or tartaric acid, an amino acid, such as aspartic acid or glutamic acid, an aromatic acid, such as benzoic acid or cinnamic acid, a sulfonic acid, such as p-toluenesulfonic acid or ethanesulfonic acid, or the like.

[0076] If the Mactanamide compound is an acid, the desired pharmaceutically acceptable salt may be prepared by any suitable method, for example, treatment of the free acid with an inorganic or organic base, such as an amine (primary, secondary or tertiary), an alkali metal hydroxide or alkaline earth metal hydroxide, or the like. Illustrative examples of suitable salts include organic salts derived from basic amino acids, such as lysine and arginine, ammonia, primary, secondary, and tertiary amines, and cyclic amines, such as piperidine, morpholine and piperazine, and inorganic salts derived from sodium, calcium, potassium, magnesium, manganese, iron, copper, zinc, aluminum and lithium.

[0077] In the case of compounds that are solids, it is understood by those skilled in the art that the inventive compounds and salts may exist in different crystal or polymorphic forms, all of which are intended to be within the scope of the present invention and specified structural formulas.

[0078] The anti-inflammatory activity of the Mactanamide compounds of the present invention may be measured by any of the methods available to those skilled in the art, including in vitro and in vivo assays. Examples of suitable assays for activity measurements are provided herein. Properties of the Mactanamide compounds may be assessed, for example, by using one or more of the assays set out in the Examples below. Other pharmacological methods may also be used to determine the efficacy of the compounds as anti-inflammatory compounds.

[0079] The Mactanamide compounds in accordance with the present invention are useful in the treatment of inflammation and inflammatory diseases or disorders, preferably inflammation of the skin such as psoriasis and eczema. Other inflammatory diseases and disorders include osteoarthritis, rheumatoid arthritis, colitis, and Cohn's disease. The Mactanamide compounds may also be used in cosmetic compositions such as lotions and creams to decrease swelling and inflammation or improve the overall appearance of a subject's skin.

[0080] The Mactanamide compounds of the present invention may be used in combination with or as a substitution for treatments of inflammatory diseases and disorders. For example, the Mactanamide compounds may also be used alone or in combination with a supplementary active compound such as anti-inflammatory agents, analgesics and the like to treat, prevent or inhibit inflammatory diseases and disorders. For example, the Mactanamide compounds of the invention may be used alone or in combination with glucocorticoids, cyclooxygenase (COX) inhibitors, aspirin, or methotrexate to treat inflammatory disorders such as rheumatoid arthritis. Further, the Mactanamide compounds of the present invention may be used alone or in combination with analgesics to treat, prevent or inhibit pain.

[0081] An Mactanamide compound of the present invention may be administered in a therapeutically effective amount to a mammal such as a human. Therapeutically effective amounts of the Mactanamide compounds of the invention may be used to treat, modulate, attenuate, reverse, or affect the inflammatory pathway in a mammal. The inflammatory pathway may be either the immunogenic inflammatory pathway, the neurogenic inflammatory pathway, or both. An “effective amount” is intended to mean that amount of an agent that, is sufficient to treat, prevent, or inhibit cytokine or eicosanoid production or neutrophil influx. Thus, e.g., a “therapeutically effective amount” of an Mactanamide compound, a prodrug, an active metabolite, or a salt thereof, is a quantity sufficient to, when administered to a mammal, treat, prevent, or inhibit cytokine or eicosanoid production or neutrophil influx in the mammal. The amount of a given Mactanamide that will correspond to such an amount will vary depending upon factors such as the given drug or compound, the pharmaceutical formulation and route of administration, the type of inflammatory disease or disorder, the type of inflammation, and the identity of the subject or host being treated, but can nevertheless be routinely determined by one skilled in the art. Also, as used herein, a “therapeutically effective amount” of an Mactanamide compound of the present invention is an amount which prevents, inhibits, suppresses, or reduces the amount of inflammation as caused by an irritant, such as PMA, in a subject as compared to a control. As defined herein, a therapeutically effective amount of a compound of the present invention may be readily determined by one of ordinary skill by routine methods known in the art.

[0082] For example, a therapeutically effective amount of a compound of the invention ranges from about 0.1 to about 1,000 mg/kg body weight, preferably about 0.1 to about 500 mg/kg body weight, and more preferably about 0.1 to about 100 mg/kg body weight. The skilled artisan will appreciate that certain factors may influence the dosage required to effectively treat a subject, including but not limited to the severity of the disease or disorder, previous treatments, the general health and/or age of the subject, and other diseases present.

[0083] Preferred topical concentrations include about 0.1% to about 10% of at least one Mactanamide compound in a formulated salve. The skilled artisan will appreciate that certain factors may influence the dosage required to effectively treat a subject, including but not limited to the severity of the disease or disorder, previous treatments, the general health and/or age of the subject, and other diseases present.

[0084] Moreover, treatment of a subject with a therapeutically effective amount of the Mactanamide compound may consist of a single administration, or alternatively comprise a series of applications. For example, a subject may be treated with an Mactanamide compound of the invention at least once. However, the subject may treated with the Mactanamide compound from about one time per week to about once daily for a given treatment period. The length of the treatment period will depend on a variety of factors such as the severity of inflammation, the concentration and activity of the Mactanamide composition, or a combination thereof. It will also be appreciated that the effective dosage of the compound used for treatment may increase or decrease over the course of a particular treatment. Changes in dosage may result and become apparent by standard diagnostic assays known in the art. In some instances chronic administration may be required. The Mactanamide compound may be administered before, during, after, or a combination thereof exposure to an irritant that causes inflammation.

[0085] The pharmaceutical compositions of the invention may be prepared in a unit-dosage form appropriate for the desired mode of administration. The compositions of the present invention may be administered for therapy by any suitable route including oral, rectal, nasal, topical (including buccal and sublingual), vaginal and parenteral (including subcutaneous, intramuscular, intravenous and intradermal). It will be appreciated that the preferred route will vary with the condition and age of the recipient, the nature of the condition to be treated, and the chosen Mactanamide compound.

[0086] It will be appreciated that the actual dosages of the compounds used in the compositions of this invention will vary according to the particular complex being used, the particular composition formulated, the mode of administration, and the particular site, host, and disease being treated. Optimal dosages for a given set of conditions may be ascertained by those skilled in the art using conventional dosage-determination tests in view of the experimental data for a given Mactanamide compound. Administration of prodrugs may be dosed at weight levels that are chemically equivalent to the weight levels of the fully active forms.

[0087] The Mactanamide compounds of the invention can be incorporated into pharmaceutical compositions suitable for administration. Pharmaceutical compositions of this invention comprise a therapeutically effective amount of at least one Mactanamide compound, and an inert, pharmaceutically or cosmetically acceptable carrier or diluent. As used herein the language “pharmaceutically or cosmetically acceptable carrier” is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical or cosmetic administration. The pharmaceutical or cosmetic carrier employed may be either a solid or liquid. Exemplary of solid carriers are lactose, sucrose, talc, gelatin, agar, pectin, acacia, magnesium stearate, stearic acid and the like. Exemplary of liquid carriers are syrup, peanut oil, olive oil, water and the like. Similarly, the carrier or diluent may include time-delay or time-release material known in the art, such as glyceryl monostearate or glyceryl distearate alone or with a wax, ethylcellulose, hydroxypropylmethylcellulose, methylmethacrylate and the like. The use of such media and agents for pharmaceutically or cosmetically active substances is well known in the art.

[0088] Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the compositions is contemplated. Supplementary active compounds can also be incorporated into the compositions. Supplementary active compounds include anti-inflammatory agents and analgesics and other compounds commonly used to treat inflammation or commonly used in cosmetics to enhance the skin of a subject such as color and elasticity.

[0089] A pharmaceutical or cosmetic composition of the invention is formulated to be compatible with its intended route of administration. Examples of routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration. Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. The pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic.

[0090] A variety of pharmaceutical forms can be employed. Thus, if a solid carrier is used, the preparation can be tableted, placed in a hard gelatin capsule in powder or pellet form or in the form of a troche or lozenge. The amount of solid carrier may vary, but generally will be from about 25 mg to about 1 g. If a liquid carrier is used, the preparation will be in the form of syrup, emulsion, soft gelatin capsule, sterile injectable solution or suspension in an ampoule or vial or non-aqueous liquid suspension.

[0091] To obtain a stable water-soluble dose form, a pharmaceutically acceptable salt of an inventive agent is dissolved in an aqueous solution of an organic or inorganic acid, such as 0.3M solution of succinic acid or citric acid. If a soluble salt form is not available, the agent may be dissolved in a suitable co-solvent or combinations of co-solvents. Examples of suitable co-solvents include, but are not limited to, alcohol, propylene glycol, polyethylene glycol 300, polysorbate 80, glycerin and the like in concentrations ranging from 0-60% of the total volume. In an exemplary embodiment, the Mactanamide compound of the present invention is dissolved in DMSO and diluted with water.

[0092] The composition may also be in the form of a solution of a salt form of the active ingredient in an appropriate aqueous vehicle such as water or isotonic saline or dextrose solution.

[0093] The compositions of the invention may be manufactured in manners generally known for preparing pharmaceutical compositions, e.g., using conventional techniques such as mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or lyophilizing. Pharmaceutical compositions may be formulated in a conventional manner using one or more physiologically acceptable carriers, which may be selected from excipients and auxiliaries that facilitate processing of the active compounds into preparations which can be used pharmaceutically.

[0094] Proper formulation is dependent upon the route of administration chosen. For injection, the agents of the invention may be formulated into aqueous solutions, preferably in physiologically compatible buffers such as Hanks' solution, Ringer's solution, or physiological saline buffer. For transmucosal administration, penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.

[0095] For oral administration, the compounds can be formulated readily by combining the active compounds with pharmaceutically acceptable carriers known in the art. Such carriers enable the compounds of the invention to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions and the like, for oral ingestion by a patient to be treated. Pharmaceutical preparations for oral use can be obtained using a solid excipient in admixture with the active ingredient (compound), optionally grinding the resulting mixture, and processing the mixture of granules after adding suitable auxiliaries, if desired, to obtain tablets or dragee cores. Suitable excipients include: fillers such as sugars, including lactose, sucrose, mannitol, or sorbitol; and cellulose preparations, for example, maize starch, wheat starch, rice starch, potato starch, gelatin, gum, methyl cellulose, hydroxypropylmethyl-cellulose, sodium carboxymethylcellulose, or polyvinylpyrrolidone (PVP). If desired, disintegrating agents may be added, such as crosslinked polyvinyl pyrrolidone, agar, or alginic acid or a salt thereof such as sodium alginate.

[0096] Dragee cores are provided with suitable coatings. For this purpose, concentrated sugar solutions may be used, which may optionally comprise gum arabic, polyvinyl pyrrolidone, Carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures. Dyestuffs or pigments may be added to the tablets or dragee coatings for identification or to characterize different combinations of active compounds and agents.

[0097] Pharmaceutical preparations which can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a plasticizer, such as glycerol or sorbitol. The push-fit capsules can comprise the active ingredients in admixture with fillers such as lactose, binders such as starches, and/or lubricants such as talc or magnesium stearate, and, optionally, stabilizers. In soft capsules, the active agents may be dissolved or suspended in suitable liquids, such as fatty oils, liquid paraffin, or liquid polyethylene glycols. In addition, stabilizers may be added. All formulations for oral administration should be in dosages suitable for such administration. For buccal administration, the compositions may take the form of tablets or lozenges formulated in conventional manner.

[0098] Oral compositions generally include an inert diluent or an edible carrier. They can be enclosed in gelatin capsules or compressed into tablets. For the purpose of oral therapeutic administration, the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules. Oral compositions can also be prepared using a fluid carrier for use as a mouthwash, wherein the compound in the fluid carrier is applied orally and swished and expectorated or swallowed. Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition. The tablets, pills, capsules, troches and the like can comprise any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring. Preferred formulations for oral formulations include microcrystalline tablets, gelatin capsules, or the like.

[0099] For administration intranasally or by inhalation, the compounds for use according to the present invention are conveniently delivered in the form of an aerosol spray presentation from pressurized packs or a nebuliser, with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of a pressurized aerosol the dosage unit may be determined by providing a valve to deliver a metered amount. Capsules and cartridges of gelatin for use in an inhaler or insufflator and the like may be formulated comprising a powder mix of the compound and a suitable powder base such as lactose or starch.

[0100] The compounds may be formulated for parenteral administration by injection, e.g., by bolus injection or continuous infusion. Formulations for injection may be presented in unit-dosage form, e.g., in ampoules or in multi-dose containers, with an added preservative. The compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may comprise formulatory agents such as suspending, stabilizing and/or dispersing agents.

[0101] Pharmaceutical compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. Aqueous injection suspensions may comprise substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran. Optionally, the suspension may also comprise suitable stabilizers or agents which increase the solubility of the compounds to allow for the preparation of highly concentrated solutions. Additionally, suspensions of the active agents may be prepared as appropriate oily injection suspensions. Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides, or liposomes.

[0102] For intravenous administration, suitable carriers include physiological saline, bacteriostatic water, Cremophor EL™ (BASF, Parsippany, N.J.) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi. The carrier can be a solvent or dispersion medium comprising, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyetheylene glycol, and the like), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.

[0103] Sterile injectable solutions can be prepared by incorporating a therapeutically effective amount of a compound of the invention in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the Mactanamide compound into a sterile vehicle which comprises a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active compound plus any additional desired ingredient from a previously sterile-filtered solution thereof.

[0104] Systemic administration can also be by transmucosal or transdermal means. For transmucosal or transdermal administration, penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives. Transmucosal administration can be accomplished through the use of nasal sprays or suppositories. For transdermal administration, the active compounds are formulated into ointments, salves, gels, foams, powders, sprays, aerosols or creams as generally known in the art.

[0105] For example, for topical formulations, pharmaceutically acceptable excipients or cosmetically acceptable carriers and additives include solvents, emollients, humectants, preservatives, emulsifiers, and pH agents. Suitable solvents include ethanol, acetone, glycols, polyurethanes, and others known in the art. Suitable emollients include petrolatum, mineral oil, propylene glycol dicaprylate, lower fatty acid esters, lower alkyl ethers of propylene glycol, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, stearic acid, wax, and others known in the art. Suitable humectants include glycerin, sorbitol, and others known in the art. Suitable emulsifiers include glyceryl monostearate, glyceryl monoleate, stearic acid, polyoxyethylene cetyl ether, polyoxyethylene cetostearyl ether, polyoxyethylene stearyl ether, polyethylene glycol stearate, propylene glycol stearate, and others known in the art. Suitable pH agents include hydrochloric acid, phosphoric acid, diethanolamine, triethanolamine, sodium hydroxide, monobasic sodium phosphate, dibasic sodium phosphate, and others known in the art. Suitable preservatives include benzyl alcohol, sodium benzoate, parabens, and others known in the art.

[0106] For administration to the eye, the compound of the invention is delivered in a pharmaceutically acceptable ophthalmic vehicle such that the compound is maintained in contact with the ocular surface for a sufficient time period to allow the compound to penetrate the corneal and internal regions of the eye, including, for example, the anterior chamber, posterior chamber, vitreous body, aqueous humor, vitreous humor, cornea, iris/cilary, lens, choroid/retina and selera. The pharmaceutically acceptable ophthalmic vehicle may be an ointment, vegetable oil, or an encapsulating material. A compound of the invention may also be injected directly into the vitreous and aqueous humor.

[0107] Alternatively, the active ingredient may be in powder form for constitution with a suitable vehicle, e.g., sterile pyrogen-free water, before use. The compounds may also be formulated in rectal compositions such as suppositories or retention enemas, e.g., comprising conventional suppository bases such as cocoa butter or other glycerides.

[0108] In addition to the formulations described above, the compounds may also be formulated as a depot preparation. Such long-acting formulations may be administered by implantation (for example, subcutaneously or intramuscularly) or by intramuscular injection. Thus, for example, the compounds may be formulated with suitable polymeric or hydrophobic materials (for example, as an emulsion in an acceptable oil) or ion-exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.

[0109] A pharmaceutical carrier for hydrophobic compounds is a cosolvent system comprising benzyl alcohol, a nonpolar surfactant, a water-miscible organic polymer, and an aqueous phase. The cosolvent system may be a VPD co-solvent system. VPD is a solution of 3% w/v benzyl alcohol, 8% w/v of the nonpolar surfactant polysorbate 80, and 65% w/v polyethylene glycol 300, made up to volume in absolute ethanol. The VPD co-solvent system (VPD:5W) comprises VPD diluted 1:1 with a 5% dextrose in water solution. This co-solvent system dissolves hydrophobic compounds well, and itself produces low toxicity upon systemic administration. Naturally, the proportions of a co-solvent system may be varied considerably without destroying its solubility and toxicity characteristics. Furthermore, the identity of the co-solvent components may be varied, for example: other low-toxicity nonpolar surfactants may be used instead of polysorbate 80; the fraction size of polyethylene glycol may be varied; other biocompatible polymers may replace polyethylene glycol, e.g. polyvinyl pyrrolidone; and other sugars or polysaccharides may be substituted for dextrose.

[0110] Alternatively, other delivery systems for hydrophobic pharmaceutical compounds may be employed. Liposomes and emulsions are known examples of delivery vehicles or carriers for hydrophobic drugs and cosmetics. Certain organic solvents such as dimethylsulfoxide also may be employed, although usually at the cost of greater toxicity. Additionally, the compounds may be delivered using a sustained-release system, such as semipermeable matrices of solid hydrophobic polymers comprising the therapeutic agent. Various sustained-release materials have been established and are known by those skilled in the art. Sustained-release capsules may, depending on their chemical nature, release the compounds for a few weeks up to over 100 days. Depending on the chemical nature and the biological stability of the therapeutic reagent, additional strategies for protein stabilization may be employed.

[0111] The pharmaceutical compositions also may comprise suitable solid- or gel-phase carriers or excipients. Examples of such carriers or excipients include calcium carbonate, calcium phosphate, sugars, starches, cellulose derivatives, gelatin, and polymers such as polyethylene glycols.

[0112] Some of the compounds of the invention may be provided as salts with pharmaceutically compatible counter ions. Pharmaceutically compatible salts may be formed with many acids, including hydrochloric, sulfuric, acetic, lactic, tartaric, malic, succinic, and the like. Salts tend to be more soluble in aqueous or other protonic solvents than are the corresponding free-base forms.

[0113] In one embodiment, the Mactanamide compounds are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art. The materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc. Liposomal suspensions can also be used as pharmaceutically or cosmetically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Pat. No. 4,522,811.

[0114] It is especially advantageous to formulate oral or parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit comprising a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.

[0115] The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and the limitations inherent in the art of compounding such an active compound for the treatment of individuals.

[0116] Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD50/ED50. Compounds which exhibit large therapeutic indices are preferred. While compounds that exhibit toxic side effects may be used, care should be taken to design a delivery system that targets such compounds to the site of affected tissue in order to minimize potential damage to uninfected cells and, thereby, reduce side effects.

[0117] The data obtained from the cell culture assays and animal studies can be used in formulating a range of dosage for use in humans. The dosage of such compounds lies preferably within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized. For any compound used in the method of the invention, the therapeutically effective dose can be estimated initially from cell culture assays. A dose may be formulated in animal models to achieve a circulating plasma concentration range that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture. Such information can be used to more accurately determine useful doses in humans. Levels in plasma may be measured, for example, by high performance liquid chromatography.

[0118] The following examples are intended to illustrate but not to limit the invention.

EXAMPLE 1

Anti-Inflammatory Mouse Ear Assays

[0119] A. Inhibition of Mouse Ear Edema.

[0120] The efficacy of Mactanamide compounds as an anti-inflammatory agent was established by the following assay. Mactanamide was topically applied in acetone to the inside pinnae of the ears of mice in a solution comprising an edema-causing irritant, phorbol 12-myristate 13-acetate (PMA). Specifically, 2 μg/ear of PMA alone or in combination with 25 μg/ear of Mactanamide was applied to the left ears (5 mice per treatment group) and acetone was applied to all right ears. After 3 hours, 20 minutes incubation, the mice were sacrificed, the ears removed and bores taken and weighed. Edema was measured by subtracting the weight of the right ear (acetone control) from the weight of the left ear (treated). Results were recorded as % decrease (inhibition) or % increase (potentiation) in edema relative to the PMA control group edema. As shown in Table 1, Mactanamide significantly inhibited edema in the PMA mouse ear model by about 84.0%.

1TABLE 1InhibitionTreatmentDoseEdema (mg ± SEM)Nof EdemaPMA Control2ug/ear16.2 ± 1.150.0%Mactanamide25ug/ear 2.6 ± 1.1583.7%

[0121] These results suggest that Mactanamide compounds of the present invention are potent anti-inflammatory agents.

[0122] Systemic effects may be studied using the same model except the compound is given systemically, either intraperitoneally or subcutaneously, both as a pre-treatment and as a post-treatment to topically applied PMA. For example, the Mactanamide compounds are administered by intraperitoneal injection in a vehicle comprising 20% propylene glycol, 80% saline and 3 drops TWEEN-20 30 minutes or 1 hour prior to topical application of PMA. Control animals are injected with vehicle only. 2 μg/ear of PMA is applied to the left ears and acetone is applied to the right ears. After 30 minutes of incubation, the mice are scarified, ears removed and bores taken and weighed.

[0123] B. Myeloperoxidase (MPO) Enzyme Assay.

[0124] To determine neutrophil influx into inflammed tissue region, the following assay may be conducted. Generally, myeloperoxidase (MPO), a neutrophil-specific marker released from primary granules, is indicative of the extravasation of pro-inflammation neutrophils from blood into the skin. Thus, to determine whether a test compound prevents, inhibits, modulates or attenuates inflammation related to an immunogenic inflammatory pathway or neutrophil influx, ear biopsies from treated and untreated mouse ears may be extracted and quantitated according to a modified method of Bradley, P.O., et al. (1982) J. Invest. Dermatology 78:206-209, which is herein incorporated by reference. Specifically, ear bores from each treatment group from mouse ear edema assays from part A above are pooled and homogenized in 80 mM sodium phosphate buffer (pH 5.4) comprising 0.5% hexadecyltrimethylammonium bromide in a siliconized glass test tube for 1 minute at 0° C. using a Brinkman Polytron. The mixtures are centrifuged at 10,000× g at 4° C. for 30 minutes. 10 μl samples from each group are then assayed in a 96-well microtiter plate. The assay is initiated by adding 250 μl of o-dianisi-dine/phosphate reagent (0.28 mg of dianisidine added to 1 ml of 50 mM sodium phosphate comprising 0.0015H2O2) to each well. After a 30 minute incubation at 37° C., the plates are read at 450 nm on a microplate reader. Diluted control biopsies are utilized to develop a standard curve. Optical density values from drug-treated groups are compared to control groups to determine the % of control values of enzyme activity.

EXAMPLE 2

Resiniferatoxin (RTX) Assay

[0125] To determine whether Mactanamide compounds inhibit, prevent, or reduce neurogenic inflammation, various dilutions of Mactanamide compounds were topically applied in acetone to the inside and outside surfaces of the left ears of mice in a solution comprising 0.1 μg RTX per ear. A control, acetone, was applied to all right ears. After a 30 minute incubation, the mice were sacrificed, the ears removed, and bores taken and weighed.

[0126] Edema was measured by subtracting the weight of the right ear (control) from the weight of the left ear. The results were recorded as % decrease (inhibition) or % increase (potentiation) in edema relative to the control group edema. As shown in Table 2, Mactanamide inhibits RTX induced edema by about 93.0%.

2TABLE 2InhibitionTreatmentDoseEdema (mg ± SEM)Nof EdemaPMA Control0.1ug/ear12.7 ± 0.450.0%Mactanamide50ug/ear 0.9 ± 0.5592.6%

[0127] For systemic studies, the Mactanamide compounds are administered by intraperitoneal injection in a vehicle comprising 20% propylene glycol, 80% saline and 3 drops TWEEN-20 30 minutes to 1 hour prior to topical application of RTX. Control animals are injected with vehicle only. 0.1 μg RTX is applied to the left ears and acetone is applied to the right ears. After 30 minutes of incubation, the mice are scarified, ears removed and bores taken and weighed.

[0128] Edema is measured by subtracting the weight of the right ear (control) from the weight of the left ear. The results are recorded as % decrease (inhibition) or % increase (potentiation) in edema relative to the control group edema.

[0129] To the extent necessary to understand or complete the disclosure of the present invention, all publications, patents, and patent applications mentioned herein are expressly incorporated by reference therein to the same extent as though each were individually so incorporated.

[0130] Having thus described exemplary embodiments of the present invention, it should be noted by those skilled in the art that the within disclosures are exemplary only and that various other alternatives, adaptations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the specific embodiments as illustrated herein, but is only limited by the following claims.

Methods of treating, preventing, or inhibiting inflammation with Mactanamide compounds

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