Pharmacological Characterization of Sch527123, a Potent Allosteric CXCR1/CXCR2 Antagonist
作者:Waldemar Gonsiorek、Xuedong Fan、David Hesk、James Fossetta、Hongchen Qiu、James Jakway、Motasim Billah、Michael Dwyer、Jianhua Chao、Gregory Deno、Art Taveras、Daniel J. Lundell、R. William Hipkin
DOI:10.1124/jpet.106.118927
日期:2007.8
In neutrophils, growth-related protein-α (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 [3H]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.
在中性粒细胞中,生长相关蛋白-α(CXCL1)和白细胞介素-8(CXCL8)是强有力的趋化诱导剂(细胞因子 14: 27-36,2001 年;生物化学 42: 2874-2886,2003 年),可通过激活 G 蛋白偶联受体 CXCR1 和 CXCR2 刺激髓过氧化物酶的释放。CXCR1 和 CXCR2 在炎症反应发病机制中的作用促进了这些受体的小分子拮抗剂的开发。本文提供的数据描述了 2-hydroxy- N , N -dimethyl-3-2-[[( R )-1-(5-methyl-furan-2-yl)-propyl]amino]-3,4-dioxo-cyclobut-1-enylamino}-benzamide (Sch527123)的药理学,它是一种新型的 CXCR1 和 CXCR2 拮抗剂。Sch527123 以一种不可逾越的方式抑制趋化因子与这些受体的结合(和激活),因此被归类为一种异构拮抗剂。Sch527123 可抑制中性粒细胞对 CXCL1 和 CXCL8 的趋化作用和髓过氧化物酶的释放,但对这些细胞对 C5a 或甲酰蛋氨酰亮氨酰苯丙氨酸的反应没有影响。Sch527123 的药理特异性是通过对一系列酶、通道和受体进行多样性测试而证实的。为了测量化合物的亲和力,我们在平衡和非平衡结合分析中对[3H]Sch527123进行了表征。Sch527123 与 CXCR1 和 CXCR2 的结合具有饱和性和可逆性。虽然 Sch527123 与 CXCR1 的结合亲和力良好(K d = 3.9 ± 0.3 nM),但该化合物具有 CXCR2 选择性(K d = 0.049 ± 0.004 nM)。综上所述,我们的数据表明 Sch527123 是一种新型、强效、特异性 CXCR2 拮抗剂,具有治疗各种炎症的潜力。