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Species-specific differences in agonistic activity of ago-allosteric modulators toward glucagon-like peptide 2 receptor

机译:变构调节剂对胰高血糖素样肽2受体激动活性的物种特异性差异

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摘要

Glucagon-like peptide 2 (GLP-2) is an intestinotropic peptide that binds to GLP-2 receptor (GLP-2R), a class-B G protein-coupled receptor (GPCR) coupled with Gα_s. Few small-molecule agonists had been reported for class-B GPCRs, but we recently reported the first scaffold compounds of ago-allosteric modulators for human GLP-2R. Methyl 2-{[(2Z)-2-(2,5-dichlorothiophen-3-yl)-2-(hydroxyimino)ethyl]sulfanyl}benzoate (compound 1) and its de-esterified derivative (compound 2) induced placental alkaline phosphatase (PLAP) activity in HEK293 cells overexpressing human GLP-2R and PLAP driven by cAMP response element. In this study, we observed that rat, Syrian hamster, and dog GLP-2Rs also responded to compounds 1 and 2 in the same reporter system. However, no agonistic activity of the compounds toward mouse GLP-2R was detected. Mutagenesis studies showed that mutant human GLP-2Rs with Pro392Leu substitution of mouse GLP-2R for human GLP-2R amino acid residues nullified the PLAP activity of compound 2, although these mutant receptors responded to GLP-2. This finding suggests that the Pro392 residue of human GLP-2R is essential for the agonistic activity of compound 2.
机译:胰高血糖素样肽2(GLP-2)是一种肠溶性肽,它与GLP-2受体(GLP-2R)结合,GLP-2受体是与Gα_s偶联的B类G蛋白偶联受体(GPCR)。很少有小分子激动剂用于B类GPCR,但是我们最近报道了人类GLP-2R的首个变构调节剂骨架化合物。 2-{[((2Z)-2-(2,5-dichlorothiophen-3-yl)-2-(hydroxyimino)ethyl] sulfanyl} benzoylmethylate(compound 1)及其去酯化衍生物(compound 2)诱导的胎盘碱性cAMP响应元件驱动的过表达人GLP-2R和PLAP的HEK293细胞中的磷酸酶(PLAP)活性。在这项研究中,我们观察到大鼠,叙利亚仓鼠和狗GLP-2R在同一报告系统中也对化合物1和2有反应。但是,没有检测到化合物对小鼠GLP-2R的激动活性。诱变研究表明,用Pro392Leu用小鼠GLP-2R取代人GLP-2R氨基酸残基的突变人GLP-2R使化合物2的PLAP活性无效,尽管这些突变受体对GLP-2作出了反应。该发现表明人GLP-2R的Pro392残基对于化合物2的激动活性是必不可少的。

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