Endogenous Gαq-Coupled Neuromodulator Receptors Activate Protein Kinase A.

Endogenous Gαq-Coupled Neuromodulator Receptors Activate Protein Kinase A.
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DOI:
10.1016/j.neuron.2017.10.023
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发表时间:
2017-12-06
期刊:
影响因子:
16.2
通讯作者:
Sabatini BL
Sabatini BL
中科院分区:
医学1区
文献类型:
--
作者:
Chen Y;Granger AJ;Tran T;Saulnier JL;Kirkwood A;Sabatini BL

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蛋白激酶A(PKA)整合G蛋白偶联神经调节剂受体的信息,调节突触和细胞功能。GαS信号刺激PKA活性,而GαI抑制PKA活性。另一方面,GαQ通过磷脂酶C发出信号,目前尚不清楚GαQ偶联受体是否在其天然环境中向PKA发出信号。在这里,使用两个独立的光学记录器在急性小鼠海马片上,我们证明了内源性G-α-Q偶联的M受体激活了PKA。从机制上讲,这种作用是通过钙或蛋白激酶C来实现的。此外,多个G-αQ偶联受体可通过经典的G-α-S/G-αI效应器来调节蛋白激酶A的磷酸化。因此,这些结果强调了PKA作为三种主要类型GPCRs的生化整合因子,并有必要重新考虑用于预测神经元信号转导响应G-αQ偶联受体大家族的经典模型。Chen等人研究表明,海马GαQ偶联的M受体激活PKA,这是一种经典的与GαS/GαI通路有关的效应器。这种调节是通过钙离子或蛋白激酶C的平行信号来实现的,并被推广到其他内源性和设计型G-αQ偶联受体。
Protein kinase A (PKA) integrates inputs from G protein-coupled neuromodulator receptors to modulate synaptic and cellular function. Gαs signaling stimulates PKA activity, whereas Gαi inhibits PKA activity. Gαq, on the other hand, signals through phospholipase C, and it remains unclear if Gαq-coupled receptors signal to PKA in their native context. Here, using two independent optical reporters of PKA activity in acute mouse hippocampus slices, we show that endogenous Gαq-coupled muscarinic acetylcholine receptors activate PKA. Mechanistically, this effect is mediated by parallel signaling via either calcium or protein kinase C. Furthermore, multiple Gαq-coupled receptors modulate phosphorylation by PKA, a classical Gαs/Gαi effector. Thus, these results highlight PKA as a biochemical integrator of three major types of GPCRs and necessitate reconsideration of classic models used to predict neuronal signaling in response to the large family of Gαq-coupled receptors. Chen et al. show that hippocampal Gαq-coupled muscarinic receptors activate PKA, an effector classically associated with the Gαs/Gαi pathways. The regulation is mediated by parallel signaling via either Ca2+ or PKC, and generalizes to other endogenous and designer Gαq-coupled receptors.
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