[<sup>3</sup>H]UR-DEBa176: A 2,4-Diaminopyrimidine-Type Radioligand Enabling Binding Studies at the Human, Mouse, and Rat Histamine H<sub>4</sub> Receptors
作者:Edith Bartole、Timo Littmann、Miho Tanaka、Takeaki Ozawa、Armin Buschauer、Günther Bernhardt
DOI:10.1021/acs.jmedchem.9b01342
日期:2019.9.12
potential "cold" form of a tritiated H4R ligand. After radiolabeling, binding studies with [3H]UR-DEBa176 ([3H]46) at the h/m/rH4Rs revealed comparable Kd values (41/17/22 nM), low nonspecific binding (11-17%, ∼Kd), and fast associations/dissociations (25-30 min) and disclosed [3H]UR-DEBa176 as useful molecular tool to determine h/m/rH4R binding affinities for H4R ligands.
人类(h),小鼠(m)和大鼠(r)组胺H4受体(H4R)之间的序列同源性差异会导致配体亲和力,效能和/或效率存在差异,因此会损害翻译动物模型和放射性配体的适用性。针对能够在h / m / rH4Rs上进行稳健和比较结合研究的放射性配体,合成了2,4-二氨基嘧啶并进行了药理研究。鉴定出的最值得注意的化合物是在h / m / rH4R处具有类似效价的两种(部分)激动剂:UR-DEBa148(N-neopentyl-4-(1,4,6,7-tetrahydro-5H-咪唑[4,5 -c] pyridin-5-yl)pyrimidin-2-amine bis(2,2,2-trifluoroacetate),43),最有效的[pEC50(报告基因测定)= 9.9 / 9.6 / 10。3]系列中的化合物略有G蛋白偏置,UR-DEBa176 [[R] -4- [3-(二甲基氨基)吡咯烷丁-1-基] -N-新戊基嘧啶丁-2-胺双(2