G蛋白结合受体17通过Gi/o-依赖机制在肠内分泌细胞中抑制类似葡萄糖的-1分泌
Jason M Conley1,2, Alexander Jochim1,2, Carmella Evans-Molina1,2,3,4
1Herman B Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
G蛋白结合受体17 (GPR17) 在肠道细胞中负面调节类似葡萄糖-1 (GLP-1) 的分泌. 信号传输主要涉及Gi/o通路,为代谢障碍提供潜在的治疗点.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 胃肠病学 胃肠病学
背景情况:
- 类似葡萄糖-1 (GLP-1) 对于代谢平衡至关重要,在糖尿病和肥胖症治疗中具有向性.
- G蛋白结合受体17 (GPR17) 存在于肠道肠内分泌细胞 (EEC) 中,并影响GLP-1分泌.
- 在EEC中GPR17的精确分子信号传递仍然不完全理解.
研究的目的:
- 阐明GPR17在调节来自EECs的GLP-1分泌中的分子信号通路.
- 量化评估GPR17信号在营养诱导GLP-1释放中的作用.
主要方法:
- 人类GPR17长异型 (hGPR17L) 在GLUTag细胞中的表达 (小鼠EEC线).
- 使用了GPR17激动剂MDL29,951和对抗剂HAMI3379.
- 采用药理学探针和遗传方法来分析信号通路 (Gi/o,Gq,cAMP,).
主要成果:
- 构成性hGPR17L活性和MDL29,951治疗抑制了GLP-1分泌,这种效应被HAMI3379.9逆转.
- MDL29,951激活了Gi/o和Gq通路,影响了cAMP和信号传递.
- GPR17对GLP-1分泌的调节依赖于Gi/o信号,独立于Gq信号,与cAMP水平没有直接相关.
结论:
- GPR17信号传递,特别是通过Gi/o通路,在调节GLP-1分泌方面发挥着重要作用.
- 结果揭示了GPR17在EECs中的功能关键机制.
- 表明有可能用逆激动剂向GPR17,以增强GLP-1分泌,以获得治疗益处.
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