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标题：Gq/11-dependent regulation of endosomal cAMP generation by parathyroid hormone class B GPCR
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作者：Alex D. White ; Frederic G. Jean-Alphonse ; Fei Fang 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2020
卷号：117
期号：13
页码：7455-7460
DOI：10.1073/pnas.1918158117
出版社：The National Academy of Sciences of the United States of America
摘要：cAMP production upon activation of G_s by G protein-coupled receptors has classically been considered to be plasma membrane-delimited, but a shift in this paradigm has occurred in recent years with the identification of several receptors that continue to signal from early endosomes after internalization. The molecular mechanisms regulating this aspect of signaling remain incompletely understood. Here, we investigated the role of G_q/11 activation by the parathyroid hormone (PTH) type 1 receptor (PTHR) in mediating endosomal cAMP responses. Inhibition of G_q/11 signaling by FR900359 markedly reduced the duration of PTH-induced cAMP production, and this effect was mimicked in cells lacking endogenous Gα_q/11. We determined that modulation of cAMP generation by G_q/11 occurs at the level of the heterotrimeric G protein via liberation of cell surface Gβγ subunits, which, in turn, act in a phosphoinositide-3 kinase-dependent manner to promote the assembly of PTHR–βarrestin–Gβγ signaling complexes that mediate endosomal cAMP responses. These results unveil insights into the spatiotemporal regulation of G_s-dependent cAMP signaling.
关键词：GPCR ; endosomal signaling ; PTH ; G-proteins ; cAMP