Pharmacological Characterization of Sch527123, a Potent Allosteric CXCR1/CXCR2 Antagonist
Autor: | Art Taveras, Daniel Lundell, Xuedong Fan, James Fossetta, Michael P. Dwyer, Jianhua Chao, Hongchen Qiu, M. Motasim Billah, R. William Hipkin, Waldemar Gonsiorek, James Jakway, David Hesk, Gregory Deno |
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Rok vydání: | 2007 |
Předmět: |
Neutrophils
Allosteric regulation Complement C5a Biology Pharmacology Binding Competitive Receptors Interleukin-8B Cell Line Receptors Interleukin-8A Mice Radioligand Assay Animals Humans Calcium Signaling CXC chemokine receptors Receptor Dose-Response Relationship Drug Molecular Structure Chemotaxis Cell Membrane Interleukin-8 Antagonist respiratory system Small molecule N-Formylmethionine Leucyl-Phenylalanine Biochemistry Chemokine binding Guanosine 5'-O-(3-Thiotriphosphate) Benzamides Molecular Medicine Signal transduction Cyclobutanes Protein Binding Signal Transduction |
Zdroj: | Journal of Pharmacology and Experimental Therapeutics. 322:477-485 |
ISSN: | 1521-0103 0022-3565 |
Popis: | In neutrophils, growth-related protein-alpha (CXCL1) and interleukin-8 (CXCL8), are potent chemoattractants (Cytokine 14:27-36, 2001; Biochemistry 42:2874-2886, 2003) and can stimulate myeloperoxidase release via activation of the G protein-coupled receptors CXCR1 and CXCR2. The role of CXCR1 and CXCR2 in the pathogenesis of inflammatory responses has encouraged the development of small molecule antagonists for these receptors. The data presented herein describe the pharmacology of 2-hydroxy-N,N-dimethyl-3-{2-[[(R)-1-(5-methyl-furan-2-yl)-propyl]amino]-3,4-dioxo-cyclobut-1-enylamino}-benzamide (Sch527123), a novel antagonist of both CXCR1 and CXCR2. Sch527123 inhibited chemokine binding to (and activation of) these receptors in an insurmountable manner and, as such, is categorized as an allosteric antagonist. Sch527123 inhibited neutrophil chemotaxis and myeloperoxidase release in response to CXCL1 and CXCL8 but had no effect on the response of these cells to C5a or formyl-methionyl-leucyl-phenylalanine. The pharmacological specificity of Sch527123 was confirmed by testing in a diversity profile against a panel of enzymes, channels, and receptors. To measure compound affinity, we characterized [(3)H]Sch527123 in both equilibrium and nonequilibrium binding analyses. Sch527123 binding to CXCR1 and CXCR2 was both saturable and reversible. Although Sch527123 bound to CXCR1 with good affinity (K(d) = 3.9 +/- 0.3 nM), the compound is CXCR2-selective (K(d) = 0.049 +/- 0.004 nM). Taken together, our data show that Sch527123 represents a novel, potent, and specific CXCR2 antagonist with potential therapeutic utility in a variety of inflammatory conditions. |
Databáze: | OpenAIRE |
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