NBI-74330 是一种有效的 CXCR3 拮抗剂，能够抑制 (125I)CXCL10 和 (125I)CXCL11 的特异性结合，Ki 值分别为 1.5 和 3.2 nM。
CAS：855527-92-3
分子式：C32H27F4N5O3
分子量：605.58
纯度：98%
存储：Store at -20°C

Background:

NBI-74330 is a potent antagonist for CXCR3, and exhibits potent inhibition of (125I)CXCL10 and (125I)CXCL11 specific binding with Ki of 1.5 and 3.2 nM, respectively. [125I]CXCL10-CXCR3|1.5 nM (Ki, in CXCR3-CHO cell membranes)|[125I]CXCL11-CXCR3|3.2 nM (Ki, in CXCR3-CHO cell membranes)

BI-74330 demonstrates potent inhibition of [125I]CXCL11 specific binding to membranes prepared from transfected CHO cells expressing CXCR3 (CXCR3-CHO) (Ki=3.6 nM). NBI-74330 is 12- and 3.5-fold more potent than CXCL9 (Ki=45.2 nM) and CXCL10 (Ki=12.5 nM), respectively, at inhibiting [125I]CXCL11 binding to CXCR3-CHO cell membranes. NBI-74330 inhibits calcium mobilization in response to CXCL11 and CXCL10 with an IC50 value of 7 nM for both ligands used at their EC80 concentrations (1 nM for CXCL11 and 30 nM for CXCL10). NBI-74330 specifically inhibits CXCR3-mediated calcium mobilization. NBI-74330 also dose-dependently inhibits CXCL11-induced [35S]GTPγS binding in membranes of cells endogenously expressing CXCR3 (H9 cells, IC50 value 5.5 nM). BI-74330 inhibits CXCL11-induced chemotaxis in these cells with an IC50 of 3.9 nM[1]. NBI-74330 (30-300 nm, 1-10 μM) produces concentration-dependent, parallel rightward shifts of the CXCL11 E/[A] curve with no significant change in the E/[A] curve maximal response[2].

NBI-74330 (100 mg/kg) results in the formation of an N-oxide metabolite, also an antagonist of CXCR3, in mice[2]. Mice treated with 100 mg/kg NBI-74330 (in 1% Na Doc in 0.5% 400Cp Methylcellulose) result in serum concentrations of approximately 1 μM. This concentration is sufficient to fully block the CXCR3 receptor in vivo[3].

[1]. Heise CE, et al. Pharmacological characterization of CXC chemokine receptor 3 ligands and a small molecule antagonist. J Pharmacol Exp Ther. 2005 Jun;313(3):1263-71. [2]. Jopling LA, et al. Analysis of the pharmacokinetic/pharmacodynamic relationship of a small molecule CXCR3 antagonist, NBI-74330, using a murine CXCR3 internalization assay. Br J Pharmacol. 2007 Dec;152(8):1260-71. [3]. van Wanrooij EJ, et al. CXCR3 antagonist NBI-74330 attenuates atherosclerotic plaque formation in LDL receptor-deficient mice. Arterioscler Thromb Vasc Biol. 2008 Feb;28(2):251-7.