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首页> 外文期刊>Molecular pharmacology. >Differences in the central nervous system distribution and pharmacology of the mouse 5-hydroxytryptamine-6 receptor compared with rat and human receptors investigated by radioligand binding, site-directed mutagenesis, and molecular modeling.
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Differences in the central nervous system distribution and pharmacology of the mouse 5-hydroxytryptamine-6 receptor compared with rat and human receptors investigated by radioligand binding, site-directed mutagenesis, and molecular modeling.

机译:通过放射性配体结合,定点诱变和分子模型研究了小鼠5-羟基色胺6受体与大鼠和人受体的中枢神经系统分布和药理学差异。

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摘要

There is increasing evidence for a role of 5-hydroxytrypta-mine-6 (5-HT6) receptors in cognitive function. In the rat and human brain, 5-HT6 receptors are widely expressed and highly enriched in the basal ganglia. However, in the mouse brain, only very low levels of 5-HT6 receptor mRNA and receptor protein, measured by TaqMan reverse transcriptase-polymerase chain reaction and selective radioligand binding, could be detected, with no evidence of enrichment in the basal ganglia. The mouse receptor was cloned and transiently expressed in human embryonic kidney 293 cells to characterize its pharmacological profile. Despite significant sequence homology between human, rat, and mouse 5-HT6 receptors, the pharmacological profile of the mouse receptor was significantly different from the rat and human receptors. Four amino acid residues, conserved in rat and human and divergent in mouse receptors, were identified, and various mutant receptors were generated and their pharmacologies studied. Residues 188 (tyrosine in mouse, phenylalanine in rat and human) in transmembrane region 5 and 290 (serine in mouse, asparagine in rat and human) in transmembrane region 6 were identified as key amino acids responsible for the different pharmacological profiles. Molecular modeling of the receptor and docking of selective and nonselective compounds was undertaken to elucidate the ligand receptor interactions. The binding pocket was predicted to be different in the mouse compared with rat and human 5-HT6 receptors, and the models were in excellent agreement with the observed mutation results and have been used extensively in the design of further selective 5-HT6 antagonists.
机译:越来越多的证据表明5-羟色胺6(5-HT6)受体在认知功能中的作用。在大鼠和人脑中,5-HT6受体在基底神经节中广泛表达并高度富集。然而,在小鼠大脑中,只能检测到通过TaqMan逆转录酶-聚合酶链反应和选择性放射性配体结合测量的极低水平的5-HT6受体mRNA和受体蛋白,而没有在基底神经节富集的证据。克隆了小鼠受体,并在人胚胎肾293细胞中瞬时表达,以表征其药理作用。尽管人,大鼠和小鼠5-HT6受体之间存在明显的序列同源性,但小鼠受体的药理特性与大鼠和人受体明显不同。鉴定了在大鼠和人中保守的四个氨基酸残基,在小鼠受体中有差异的氨基酸残基,产生了各种突变受体,并研究了它们的药理作用。跨膜区域5中的残基188(小鼠中的酪氨酸,大鼠和人中的苯丙氨酸)和跨膜区域6中的290(小鼠中的丝氨酸,大鼠和人中的天冬酰胺)被确定为负责不同药理学特征的关键氨基酸。进行受体的分子建模以及选择性和非选择性化合物的对接,以阐明配​​体受体之间的相互作用。预测与大鼠和人5-HT6受体相比,小鼠中的结合口袋会有所不同,并且该模型与观察到的突变结果非常吻合,并已广泛用于设计其他选择性5-HT6拮抗剂。

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