Selective A<sub>3</sub> Adenosine Receptor Antagonist Radioligand for Human and Rodent Species
作者:R. Rama Suresh、Zhan-Guo Gao、Veronica Salmaso、Eric Chen、Ryan G. Campbell、Russell B. Poe、Theodore E. Liston、Kenneth A. Jacobson
DOI:10.1021/acsmedchemlett.1c00685
日期:2022.4.14
-affinity radioligand [3H]MRS7799. A3AR Kd values were (nM): 0.55 (human), 3.74 (mouse), and 2.80 (rat). An extended methyl acrylate (MRS8074, 19) maintained higher affinity (18.9 nM) than a 3-((5-chlorothiophen-2-yl)ethynyl) derivative 20. Compound 9 had an excellent brain distribution in rats (brain/plasma ratio ∼1). Receptor docking predicted its orthosteric site binding by engaging residues that
A 3腺苷受体(A 3 AR)是疼痛、局部缺血和炎性疾病治疗的靶标。可用的配体工具包括选择性激动剂和拮抗剂,包括放射性配体,但大多数高亲和力非核苷拮抗剂对灵长类物种的选择性有限。我们探索了先前报道的 A 3 AR 拮抗剂 DPTN 9 ( N -[4-(3,5-二甲基苯基)-5-(4-吡啶基)-1,3-噻唑-2-基]) 的构效关系烟酰胺)用于放射性标记,包括 3-卤素衍生物(3-碘,MRS7907),并将9表征为高亲和力放射性配体 [ 3 H]MRS7799。A 3 AR K d值为 (nM):0.55(人)、3.74(小鼠)和 2.80(大鼠)。扩展的丙烯酸甲酯 (MRS8074, 19 ) 比 3-((5-chlorothiophen-2-yl)ethynyl) 衍生物20保持更高的亲和力 (18.9 nM) 。化合物9在大鼠中具有极好的脑分布(脑/血浆比 ~ 1)。受体对接通过结合先前发现对