G-protein-coupled receptors mediate 14-3-3 signal transduction.

G-protein-coupled receptors mediate 14-3-3 signal transduction.
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DOI:
10.1038/sigtrans.2016.18
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发表时间:
2016
影响因子:
39.3
通讯作者:
Eishingdrelo H
Eishingdrelo H
中科院分区:
医学1区
文献类型:
--
作者:
Li H;Eishingdrelo A;Kongsamut S;Eishingdrelo H

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G蛋白偶联受体(GPCR)相互作用蛋白可能通过引发特定的信号转导级联、诱导与其他通路的串扰以及微调信号来参与调节GPCR信号传导。然而,除了G-蛋白和β-抑制蛋白,其他GPCR相互作用蛋白的特征很差。14-3-3蛋白是信号衔接子,并且它们在GPCR信号传导中的参与尚未被很好地理解或认识。在这里,我们证明,GPCR介导的14-3-3信号是配体调节,可能是一个更普遍的现象,比以前的报告,14-3-3涉及一些GPCR。这是我们第一次能够对GPCR/14-3-3信号转导进行定量表征。我们已经表明,GPCR介导的14-3-3信号是磷酸化依赖性的,并且GPCR/14-3-3相互作用可能发生在受体脱敏和内化之后。GPCR介导的14-3-3信号传导可以是β-抑制蛋白非依赖性的,并且单独的激动剂可以对14-3-3和β-抑制蛋白信号传导具有不同的效力。GPCR还可以介导14-3-3和Raf-1之间的相互作用。我们的工作开辟了一个新的广阔领域,以前不受重视的GPCR信号转导。将GPCR与14-3-3信号转导联系起来,为开发新的研究方向创造了潜力,并为药物发现提供了新的信号通路。
G-protein-coupled receptor (GPCR)-interacting proteins likely participate in regulating GPCR signaling by eliciting specific signal transduction cascades, inducing cross-talk with other pathways, and fine tuning the signal. However, except for G-proteins and β-arrestins, other GPCR-interacting proteins are poorly characterized. 14-3-3 proteins are signal adaptors, and their participation in GPCR signaling is not well understood or recognized. Here we demonstrate that GPCR-mediated 14-3-3 signaling is ligand-regulated and is likely to be a more general phenomenon than suggested by the previous reports of 14-3-3 involvement with a few GPCRs. For the first time, we can pharmacologically characterize GPCR/14-3-3 signaling. We have shown that GPCR-mediated 14-3-3 signaling is phosphorylation-dependent, and that the GPCR/14-3-3 interaction likely occurs later than receptor desensitization and internalization. GPCR-mediated 14-3-3 signaling can be β-arrestin-independent, and individual agonists can have different potencies on 14-3-3 and β-arrestin signaling. GPCRs can also mediate the interaction between 14-3-3 and Raf-1. Our work opens up a new broad realm of previously unappreciated GPCR signal transduction. Linking GPCRs to 14-3-3 signal transduction creates the potential for the development of new research directions and provides a new signaling pathway for drug discovery.
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