Patent Grant
7122533
The present invention relates generally to methods, compounds and compositions for inhibiting effective binding of a chemokine to its cellular receptor. The compounds and compositions include cosalane and analogs thereof. The invention further relates to methods, compounds and compositions for treating inflammatory diseases.
Inflammation is a natural immune system response to injury or destruction of tissues and serves to destroy or otherwise confine an injurious agent or injured tissue. The inflammatory process includes targeting immune system and other cells to the site of damage to effect repairs. Although the response is generally protective in nature, in many cases it results in various disease states. A variety of molecules are involved in the inflammation process, including chemokines.
Chemokines are 8–15 Kda secreted chemoattractant proteins that are released by cells at a site of tissue injury and are regarded as important mediators of inflammation due to their ability to enhance migration of certain immune system cells, including, for example, T-cells, B-cells, basophils, neutrophils, and macrophages. Chemokines have been shown to induce directional leukocyte migration (chemotaxis) by binding to seven transmembrane G-coupled protein receptors (8). Chemokines also function to induce other inflammation-related events, including lysosomal enzyme release, respiratory burst, and histamine release. The chemokines and their receptors have been shown to participate in several disease states including allergy and asthma, (9,10) and angiogenesis during solid-tumor development (11). Inhibiting many of these undesired chemokine-induced processes may be beneficial in treating many inflammatory diseases. Compounds, compositions and methods of inhibiting chemokine-induced processes are thus needed. The present invention addresses this need.
It has been discovered that cosalane and analogs thereof are effective at inhibiting effective binding of a chemokine to its cellular receptor. Accordingly, the present invention provides methods for inhibiting such interactions and compounds and compositions effective for such inhibition.
In one aspect of the present invention, methods of inhibiting binding of a chemokine to its cellular receptor are provided. In one form, a method includes contacting a cellular population with an effective amount of cosalane or an analog thereof as described herein.
In a second aspect of the invention, methods of treating an inflammatory disease are also provided. In one form, a method includes administering to a patient a therapeutically effective amount of cosalane or an analog thereof as described herein. Compositions that include cosalane or analog thereof in combination with an active agent are further provided.
In a third aspect of the present invention, compounds effective in the methods described herein are provided. The compounds include cosalane analogs as described herein.
It is an object of the invention to provide methods and compounds for inhibiting effective binding of a chemokine to its cellular receptor, so that inflammatory or other processes initiated by the chemokines will be inhibited.
It is a further object of the invention to provide methods and compounds for treating an inflammatory disease.
These and other objects and advantages of the present invention will be apparent from the descriptions herein.
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to preferred embodiments and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications of the invention, and such further applications of the principles of the invention as illustrated herein, being contemplated as would normally-occur to one skilled in the art to which the invention relates.
The present invention provides methods for inhibiting effective binding of a chemokine to its cellular receptor and compounds that may advantageously be utilized in the methods of the present invention. Practice of the methods may affect and otherwise inhibit processes initiated or otherwise induced by effective binding of a chemokine to its cellular receptor, including cellular migration and other chemokine-induced events that occur in inflammatory responses described herein and known to the art. The methods may be useful, for example, in treating inflammatory diseases as described below. In one form of the invention, a method of inhibiting effective binding of a chemokine to its cellular receptor is provided that includes contacting a cellular population with an effective amount of cosalane or derivatives or other congeners or analogs thereof. In another form of the invention, compounds are provided that may be effective in inhibiting effective binding of a chemokine to its cellular receptor that include cosalane or derivatives or other congeners or analogs thereof.
In one aspect of the invention, a method for inhibiting effective binding of a chemokine to its cellular receptor includes contacting a cellular population with an effective amount of a compound having the following structure:
wherein
R1 to R11 are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt-hereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
R12 and R13 are C1–C7 alkyl;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
As known in the art, the term “alkyl” means an aliphatic hydrocarbon which may either be straight chain or branched, and includes, for example, methyl ethyl and structural isomers of propyl, butyl, pentyl, hexyl, heptyl, and octyl. The term alkylene as used herein refers to a saturated or unsaturated hydrocarbon which may be straight chain or branched, and including, for example, methylene, ethylene and structural isomers of propylene, butylene, pentylene and hexylene, heptylene and octylene. The term “aryl” as used herein refers to a group whose molecules have the ring structure characteristic of, for example, benzene, naphthalene, anthracene and fluorene. For example, an aryl group includes phenyl, naphthyl, anthracyl, phenanthryl, fluorenyl and biphenyl.
The halogen group may be selected from halogens known to the art, especially chlorine and bromine. It is further noted that where substituents are indicated, one or more of the indicated substituents may be present.
By “inhibiting effective binding”, it is meant that compounds described herein may either inhibit binding of a particular chemokine to its cellular receptor or may allow non-productive binding of a chemokine to its receptor, such as wherein the binding does not promote, induce or otherwise initiate chemokine-induced events, including, for example, cellular chemotaxis and other chemokine-induced events described below and known to the skilled artisan. In certain forms of the invention, the compound may be cosalane, wherein R1 R5, R6 and R10 are H, R2 and R7 are chlorine, R3 and R8 are hydroxy, R4 and R9 are COOH or a salt thereof, R11 is CH(CH3)(CH2)3CH(CH3)2, R12 and R13 are methyl, X is C═CH(CH2)2, wherein cosalane has the following structure:
In other preferred forms of the invention, the hydroxyl group of R3 and/or R8 of cosalane may be replaced with OCH2—R26R27, wherein R26 is an aryl group, such as a phenyl (Ph) group, and R27 may be COOH or a salt thereof. When the aryl group of R26 is phenyl, carboxybenzyl analogs of cosalane are formed that may be advantageously utilized in the methods described herein. The phenyl ring of carboxybenzyl may be substituted with the carboxyl group at any available ring position, including the ortho, meta, or para positions, although ortho and meta positions are preferred. Alternatively, a substitutent on the phenyl ring may be nitro (NO2), to form nitrobenzyl derivatives of cosalane or may be B(OH)2 to form boronic acid derivatives of cosalane. The nitro and B(OH)2 groups may also be present at any available ring position, but preferably at the meta position. Furthermore, a substituent on the phenyl ring may be another phenyl ring, preferably at the para position, wherein the phenyl ring substituent may be substituted by COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or a C1–C7 alkoxy group, preferably a methoxy group.
Yet other preferred compounds that may advantageously be utilized in the methods of the present invention include compounds having the following structure:
wherein
R1 to R11 are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt thereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
wherein at least one of R3 or R8 is O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy, or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy;
R12 and R13 are C1–C7 alkyl;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
In preferred forms of the invention, R1, R5, R6 and R10 are H, R2 and/or R7 are halogen, such as chlorine or bromine, R3 and/or R8 are O(CH2)nR26—R271 wherein n is 1 to 7, R26 is a phenyl ring substituted with R27, which may be COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or a C1–C7 alkoxy. The phenyl ring may further preferably be substituted with another phenyl ring wherein the phenyl ring substituent may be substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or a C1–C7 alkoxy.
In yet other preferred forms of the invention, amino acid derivatives of cosalane may be advantageously utilized in the present invention wherein the carboxyl group of R4 and/or R9 of cosalane is conjugated to amino acids, such that at least one of R4 or R9 is C(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl, and wherein all other R groups are as defined for cosalane. R28 may include a wide variety of amino acid side chains, such as the 20 naturally occurring amino acid side chains known to the art, including leucine, glycine, aspartic acid, glutamic acid and alanine. The compounds may have the following structure:
wherein
R1 to R11 are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt thereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
wherein at least one of R4 and R9 is OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl radical;
R12 and R13 are C1–C7 alkyl groups;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
Other preferred compounds useful in the methods of the present invention include those having the following structure:
wherein
R1 to R11 and R11′ are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt thereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
R12 and R13 are C1–C7 alkyl;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
In one form of the invention, R1 R5, R6 and R10 are hydrogen, R2 and R7 are a halogen such as chlorine or bromine, R3 and R8 are hydroxy, R4 and R9 are COOH or a salt thereof, R12 and R13 are methyl, X is C═CH(CH2)2 and 11 and R11′ are independently hydrogen or a halogen.
Other preferred compounds useful in the methods of the present invention are those having the following formula:
wherein
R1 to R11 and R11′ are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt thereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
wherein at least one of R3 or R8 is O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy, or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy;
R12 and R13 are C1–C7 alkyl;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
Other preferred compounds useful in the methods of the present invention are those having the following formula;
wherein
R1 to R11 and R11′ are independently H, a halogen, hydroxy, amino, alkoxy having 1 to 5 carbon atoms, benzoyloxy, R14C(O)O, wherein R14 is H or C1–C5 alkyl; COOH or a salt thereof, SO3H or a salt thereof, PO3H2 or a salt thereof, C1–C24 alkyl, COOR15 where R15 is aryl or C1–C5 alkyl; SO3R16, wherein R16 is aryl or C1–C5 alkyl; C(O)NR17R18 wherein R17 and R18 are each independently H, C1–C5 alkyl, aryl or hydroxy; SO2NR19R20 wherein R19 and R20 are each independently H, C1–C5 alkyl or aryl; SR21 wherein R21 is C1–C5 alkyl or aryl; SCH2R25, wherein R25 is aryl; SC(O)R21 wherein R21 is as defined above; NR22R23 wherein R22 and R23 are each independently H, C1–C5 alkyl or aryl; NHC(O)—R24, wherein R24 is aryl optionally substituted with COOH or a salt thereof, or C1–C7 alkoxy; O(CH2)n—R26—R27, wherein n is 1 to 7, R26 is aryl, R27 is COOH or a salt thereof, B(OH)2 or a salt thereof, nitro, C1–C7 alkoxy or aryl wherein the aryl of R27 is substituted with COOH or a salt thereof, B(OH)2 or a salt thereof, nitro or C1–C7 alkoxy; OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl;
wherein at least one of R4 and R9 is OC(O)N(H)C(H)(R28)COOR29, wherein R28 is an amino acid side chain and R29 is H or a C1–C4 alkyl radical;
R12 and R13 are C1–C7 alkyl;
X is a (C1–C7 alkylene) or (C1–C7 alkylene)C(O)NH;
or a pharmaceutically acceptable salt thereof.
Other preferred compounds include, for example, those represented by formulas IV to X in U.S. Pat. No. 5,439,899.
The compounds of the present invention may be synthesized by the skilled artisan as known in the art. Synthesis of carboxybenzyl derivatives may be accomplished, for example, as described in Paul, G. C. (2000) Biorg. Med. Chem. Lett. 10:2149–2152 and Cushman, M. (1998) Biorg. Med. Chem. Lett. 8:833–836. Other synthetic routes for the compounds described herein include those found in Cushman et al. (1999) J. Med. Chem. 42(10):1767–1777;Ruell, J. A. et al. (1999) 64:5858–5866; and U.S. Pat. No. 5,439,899 to Cushman et al. Amino acid derivatives of cosalane may be synthesized utilizing peptide chemistry known in the art, and as described, for example, in Example 6 and in Santhosh, K. C. et al. (2000) Bioorg. Med. Chem. Lett. 10:2505–2508.
A wide variety of chemokine-induced cellular processes may be affected by cosalane and the cosalane analogs described herein, including inflammation-related processes, such as degranulation, respiratory burst, lysosomal enzyme release, histamine release, N-acetyl-beta-glucuronaminidase release, adherence to activated endothelial cells, immune system cell activation, leukotriene release, cellular chemotaxis and chemoattraction.
A wide variety of cells whose chemokine-induced chemotaxis may is be inhibited by cosalane and analogs thereof include immune system cells, such as granulocytes, including neutrophils, polymorphonuclear cells, eosinophils, and basophils, lymphocytes, including B and T cells, natural killer cells, and monocytes. Other immune system cells whose chemokine-induced migration may be affected include dendritic cells and mast cells.
Other cells performing various processes that may be affected by cosalane or analogs thereof include, for example, stem cells, keratinocytes, endothelial cells, melanoma cells, and fibroblasts. Chemokine-induced processes performed by these cells that may be affected by cosalane or analogs thereof include, for example, proliferation (e.g., involving endothelial cells and keratinocytes), growth inhibition (e.g., involving stem cells), adhesiveness and haptotactic response (e.g., involving melanoma cells) and angiogenesis (e.g., involving endothelial cells).
The chemokines that affect the various processes described herein include, for example, members of the CXC (alpha-intercrines), CC (beta-intercrines, C and CXXXC classes. Members of the CC chemokine class include, for example, RANTES, MCP, including MCP-1, MCP-2, MCP-3 and MCP-4, eotaxin, MDC, TARC, MIP-1α, and HCC-1. Members of the CXC class include, for example, PF4, IL-8, GRO-alpha, ENA-78, IP-10, BCA-1, ITAC and SDF-1. Members of the C class include lymphotactin and members of the CXXXC class include fractalkine. In preferred forms of the invention, cosalane or analogs thereof affect the processes controlled, regulated or otherwise caused by members of the CC class of chemokines, such as RANTES or eotaxin. In other preferred forms of the invention, cosalane or analogs thereof affect the processes controlled, regulated or otherwise caused by members of the CXC class of chemokines, such as SDF-1α.
The methods described herein may be utilized in vitro or in vivo. When utilized in vivo, the methods may be advantageous in treating inflammatory diseases. A method of treating an inflammatory disease may include administering to a patient a therapeutically effective amount of any of the compounds described above. The patient is preferably an animal, such as a mammal, and further preferably a human.
A wide variety of inflammatory diseases may be treated with cosalane and analogs thereof described herein, such as inflammatory conditions that may be mediated by, or otherwise involve, chemokines, including acute inflammatory diseases as well as chronic inflammatory diseases. Inflammatory diseases that may be treated include, for example, pathogenic infections such as leischmaniasis, and other pathogenic infections caused by, for example, bacteria, fungi, and protozoans, solid tumor development, granuloma formation, allergies, asthma, arthritis, atheroscerlosis, uvitis of the eye, acute renal failure and other known inflammatory diseases in the art.
The compounds may be administered to a patient by a variety of routes, including oral and nasal, including by aerosol therapy using metered does inhalers and/or nebulizers, rectal, transdermal, ocular, subcutaneous injection and parenteral, including intravenous administration. It is realized that the compounds may be administered by a combination of different routes, although in certain circumstances, certain routes may be more preferred.
The compounds of the present invention may be administered in a pharmaceutically acceptable carrier. The carrier may be selected according to the route of administration. The carrier may include a liquid that is suitable, for example, for oral administration, including water, saline or other aqueous or other solution or beverage. The carrier may be selected for parenteral administration, and may include a sterile aqueous or non-aqueous solution that may include preservatives, bacteriostats, buffers and antioxidants known to the art. The compounds may be combined with an aerosol formulation to be administered, for example, by inhalation through the nose or mouth. The compounds may further be formulated into tablets, capsules or other orally-acceptable carriers. Tablets may include, for example, one or more of lactose, mannitol, corn starch, potato starch, microcrystalline cellulose, acacia, gelatin, colloidal silicon dioxide, talc, magnesium stearate, stearic acid, and other known excipients, colorants, diluents, buffering agents, and preservatives. Methods of preparing such carriers are well known to the skilled artisan.
The amount of the compound that will be therapeutically effective will depend on a variety of factors, including the nature and extent of the disease or other inflammatory condition being treated, the potency or activity of the active ingredient (e.g., cosalane or analog thereof) utilized, and the route of administration. The skilled artisan will be able to determine the optimum dosage by routine experimentation. A typical dose, in mg compound per kg body weight typically ranges from about 0.01 mg/kg to about 100 mg/kg, preferably about 0.1 mg/kg to about 15 mg/kg, but further preferably ranges from about 1 mg/kg to about 10 mg/kg.
Compositions are also provided herein that include the compounds described herein and another active agent. As used herein, the term “active agent” refers to other agents that may help reduce inflammation or provide some other desired benefit. Suitable active agents include, for example, non-steroidal antiflammatory drugs, such as aspirin, ibuprofen and COX-2 inhibitors; steroids, such as prednisone, and progesterone; ureido-derivatives of poly-4-amino-2-carboxyl-1-methyl pyrrole, including suradista and related compounds, gold and leukotriene antagonists. The amount of a particular agent included in the compositions will depend on a variety of factors, including the nature and extent of the disease being treated, the activity or potency of the cosalane analog, and the nature of the active agent. However, the agents are typically included in the composition in therapeutically effective amounts, such as in a weight ratio of cosalane compound or analog to active agent of about 1:10, preferably about 1:1 and further preferably about 10:1.
Reference will now be made to specific examples illustrating the compositions and methods above. It is to be understood that the examples are provided to illustrate preferred embodiments and that no limitation to the scope of the invention intended thereby.
Unless otherwise indicated, all chemicals were purchased from Sigma Chemical Co. (St. Louis, Mo.). Chemokines were purchased from the NIH cytokine repository.
Human embryonic kidney cells 293 (HEK-293) transfected to express human CCR1, CCR3, or CCR5 receptors were cultured in Dulbecco's Modified Eagles Medium (DMEM, Biowhiftaker, Walkersville, Md.) containing 10% Fetal Bovine Serum (FBS, Hyclone, Logan, Utah), 2 mM glutamine and 100 U/ml penicillin and streptomycin (Quality Biologicals, Gaithersburg, Md.). Peripheral blood mononuclear cells were isolated from fresh normal donor apheresis packs by centrifugation over Ficoll. Monocytes were enriched by 85–95% using percoll fractionation (Pharmacia, Piscataway, N.J.).
Chemotaxis Experiments
Monocyte chemotaxis was performed as previously described [Wang (1993) J. Immunol. 150:3022–3029]. Briefly, monocytes were resuspended in binding media (RPMI-1640 media containing 1% BSA, 25 mM HEPES, pH 8.0) at 1–2×106 cells/ml. Chemokines, diluted in binding media, were mixed with cosalane or the indicated cosalane analog and placed in the lower wells of a micro-chemotaxis chamber (Neuro Probe, Cabin John, Md.). Five micrometer polyvinyl-free polycarbonate membranes were placed over the chemokine mixtures. After the micro-chemotaxis chamber was assembled, 50 μl of cells were placed in the upper wells. The filled chemotaxis chambers were incubated in a humidified CO2 incubator for 90 minutes.
After incubating, the membranes were removed from the chemotaxis chamber assembly followed by gently removing the cells from the upper side of the membrane. Then cells on the lower side of the membrane were stained.
The number of cells migrating to the chemokine mixtures was determined for binding media alone, and chemokine treated and untreated cells. HEK-293 cells transfected to express human CCR1, CCR3 or CCR5 receptors were resuspended in binding media at 7.5×105 cells/ml. Ten μm polyvinyl-free polycarbonate membranes (Neuro Probe) were treated with 47 ug/ml rat tail collagen type 1 (Collaborative Biomedical Products, Bedford, Md.) in RPMI-1640 overnight, dried and placed over the chemoattractants. The assembled chemotaxis chambers were incubated in a humidified CO2 incubator for 5.5–6 hours. After the incubation, the membranes were removed from the chemotaxis chamber assembly followed by gently removing cells from the upper side of the membrane. The stained and dried membrane was mounted and the cells on the underside of the membrane were counted at 200× magnification. The results are reported as the average number of cells per high powered field at a given chemokine concentration±standard deviation.
Cosalane Analogs Tested
The compounds examined in the present study included cosalane (compound 1), a series of benzyl ether derivatives 2–11, and a number of amino acid conjugates 12–16, wherein compounds 2–11 have the following structure:
wherein R is, for compound 2, m-COO−Na+; for compound 3, o-COO−Na+; for compound 4, p-COOH; for compound 5, p-COO−Na+; for compound 6, p-(m-PhCOOH); for compound 7, m-NO2; for compound 8,p-BO2H−Na+; for compound 9, m-BO2H−Na+; for compound 10, o-BO2H−Na+; for compound 11, o-OCH3, p-COOH.
Compounds 12–16 have the following structure:
wherein R is, for compound 12, H; for compound 13, CH2COOH; for compound 14, CH2CH2COOH; for compound 15, CH2CH2SCH3; for compound 16, CH2Ph.
Syntheses of the carboxybenzyl derivatives 2–5, the m-nitrobenzyl analog 7, and the biphenyl derivative 6 from cosalane (compound 1) and protected benzyl bromides were previously reported (12–14) and the synthesis of the benzyl congener 11 was performed by straightforward modification of the published routes. Referring to
The initial hypothesis to be tested was that cosalane would bind to chemokines and thereby inhibit chemokine-induced cell migration. The ability of cosalane to block SDF-1α (a CXCR4 ligand) and RANTES- (a CCR1, CCR3, and CCR5 ligand) induced migration of human monocytes or lymphocytes was therefore examined.
The ability of the cosalane analogs 3 and 4 to block SDF-1α (a CXCR4 ligand) and RANTES (a CCR1, CCR3, and CCR5 ligand) induced migration of human monocytes or lymphocytes was initially evaluated. In these experiments, cosalane analogs 3 and 4 were mixed with the indicated concentrations of either RANTES or SDF-1α prior to their being placed in the lower wells of the chemotaxis chamber. Both 3 and 4 were screened at a concentration of 1 μM. The results in
The ability of other CCR1 and CCR5 ligands (at 2.5 ng/ml) to be inhibited by the cosalane analogs 2, 3, 4, and 5 (all tested at a concentration of 1 μM) was tested. Surprisingly, neither MiP1-α- nor MIP1-β-induced monocyte migration was inhibited by compounds 3, 4, and 5, while congener 2 proved to be a very weak inhibitor of MIP1-β that induced less than 10% reduction in cell numbers (data not shown). MIP1-α migration was not reduced by compound 2 (data not shown). It is noted that both MIP1-α and MIP1-β are ligands for CCR1, CCR5, and D6 (8).
The ability of compound 3 to inhibit RANTES-induced migration of human embryonic kidney (HEK) cells transfected to express individual chemokine receptors was initially tested. Although the cosalane analog 3 (1 μM) had no effect on RANTES-induced migration of CCR5 transfectants, it inhibited 50% of RANTES-induced CCR1 transfectant migration (
Cosalane and a wider range of cosalane analogs 2–16 were then evaluated as inhibitors of both RANTES-induced monocyte migration and RANTES-induced CCR1/HEK migration. The results of these studies are shown in Table 1.
aThere was ≦ 5% standard error in the IC50 values.
bSee references 1, 13, 14 and 16 for anti-HIV activites.
cNot active.
dNot tested
Considering the benzyl-substituted analogs 2–11 first, the data show that although some of them (2, 3, 6, 7, and 10) retain activity as inhibitors of RANTES-induced migration, none of them offer a distinct advantage in potency over cosalane, and four of the analogs (4, 5, 8, and 9) were inactive. Of the three boronic acid derivatives 8–10, only the meta-substituted compound 9 was active, and the corresponding meta carboxy analog 2 and the meta nitro compound 7 were also active. Considering the fact that the active analogs all have similar potencies, it seems that the benzyl substituents do not contribute any structural elements that are recognized by the receptor, although some of the substituents are simply not tolerated.
Of the amino acid derivatives, only the glycine conjugate 12 and the methionine derivative 15 retained activity, while the aspartic acid analog 13, the glutamic acid congener 14, and the phenylalanine compound 16 were inactive. Although the glycine derivative 12 was slightly more potent than cosalane with respect to RANTES-induced monocyte migration, it was less potent as an inhibitor of CCR1/HEK transfectant migration.
Although MCP-4 is known to bind to CCR2 and CCR3, fresh primary human monocytes only express high levels of CCR2. Thus,
Additionally, as seen in
In order to gain some insight into the possible mechanism of action of the cosalanes as inhibitors of the RANTES/CCR1 interaction, RANTES (10 μL of a 1 μg/mL solution) was acetylated with sulfo-N-hydroxysuccinimide acetate (8 μL of a 1 μg/μL solution made in 10 mM sodium acetate buffer, pH 4.0, and then diluted with 2 μL of 10 mM sodium acetate buffer, pH 4.0) at room temperature for 30 min. The ability of the modified RANTES to attract monocytes in the presence of 10 μM cosalane or cosalane congeners 3 and 5 were examined and the results are shown in
Amino acid derivatives having the following structure were synthesized:
wherein, for compound B, R1 is t-Bu, R2 is H; compound C, R′ is H, R2 is H; compound E, R1 is CH3, R2 is CH2CH(CH3)2; compound G, R1 is H, R2 is CH2CH(CH3)2; compound H, R1 is CH3, R2 is CH2Ph; compound I, R1 is H, R2 is CH2Ph, compound J, R1 is t-Bu, R2 is CH2Coot-Bu; compound K, R1 is H, R2 is CH2COOH; compound L, R1 is t-Bu, R2 is CH2CH2COOt-Bu, compound M, R1 is H, R2 is CH2CH2COOH;
wherein, for compound D, R is ethyl and for compound E, R is H;
wherein, for compound N, R1 is t-butyl, R2 is hydrogen; compound O, R1 is H, R2 is H; compound P, R1 is t-butyl, R2 is CH2CH2COO-t-butyl; compound Q, R1 is H, R2 is CH2CH2COOH.
Briefly, in synthesizing the amino acid derivatives of cosalane, amide bond formation during the coupling of cosalane to the amino acid derivatives were performed by reacting the hydrochloride salts of the amino acids with cosalane or dihydrocosalane in the presence of BOP and triethylamine in tetrahydrofuran. The leucine and phenylalanine derivatives were synthesized by coupling cosalane with the methyl esters of leucine and phenylalanine to afford protected intermediates. Hydrolysis of the methyl esters of the intermediates yielded the desired analogs. The aspartic acid derivative and the glutamic acid derivative were synthesized by reaction of cosalane with the corresponding di-tert-butyl esters of the amino acids, followed by saponification of the four tert-butyl ester groups. The glycine derivative of cosalane was similarly prepared by coupling cosalane to the tert-butyl ester of glycine to afford an ester intermediate which may be hydrolyzed. The β-alanine derivative was prepared by coupling cosalane to β-alanine ethyl ester, resulting in an ester intermediate, followed by hydrolysis of the ester groups. The dihydroanalogs O and Q were prepared by coupling dihydrocosalane with the corresponding di-tert-butyl esters of glycine and glutamic aid to afford N and P, followed by hydrolysis.
The involvement of CCR1, RANTES, and MIP1-α in multiple sclerosis and rheumatoid arthritis has stimulated interest in the design and synthesis of small molecule CCR1 antagonists. Recent studies published by Ng et al. and by Liang et al. have documented a series of CCR1 antagonists that inhibit the binding of MIP1-α, MCP-3, and RANTES (17,18). In contrast, the present series of compounds inhibit the RANTES-CCR1 interaction, but not the MIP-α interaction, and are therefore complementary in activity to the prior series of CCR1 antagonists. Hypothetically, the difference in selectivity between the present series and the prior series could reflect binding to RANTES versus binding to CCR1, respectively.
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. In addition, all references cited herein are indicative of the level of skill in the art and are hereby incorporated by reference in their entirety.
This application is a divisional application of the U.S. national patent application Ser. No. 09/771,769, filed Jan. 29, 2001 now U.S. Pat. No. 6,562,805, which claims priority to U.S. national patent application Ser. No. 09/726,101, filed Nov. 29, 2000, abandoned, which claims priority to U.S. provisional patent application Ser. No. 60/167,874, filed Nov. 29, 1999, which is hereby incorporated in its entirety by reference.
This invention was made with government support under grant number AI 36624 and contract number NO1-CO-56000 awarded by the National Institutes of Health. The Government may have certain rights in this invention.
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| Number | Date | Country | |
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| Parent | 09771769 | Jan 2001 | US |
| Child | 10436845 | US |
