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首页> 外文期刊>Neuron >Differential compartmentalization and distinct functions of GABAB receptor variants.
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Differential compartmentalization and distinct functions of GABAB receptor variants.

机译:GABAB受体变体的差异区室化和独特功能。

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摘要

GABAB receptors are the G protein-coupled receptors for the main inhibitory neurotransmitter in the brain, gamma-aminobutyric acid (GABA). Molecular diversity in the GABAB system arises from the GABAB1a and GABAB1b subunit isoforms that solely differ in their ectodomains by a pair of sushi repeats that is unique to GABAB1a. Using a combined genetic, physiological, and morphological approach, we now demonstrate that GABAB1 isoforms localize to distinct synaptic sites and convey separate functions in vivo. At hippocampal CA3-to-CA1 synapses, GABAB1a assembles heteroreceptors inhibiting glutamate release, while predominantly GABAB1b mediates postsynaptic inhibition. Electron microscopy reveals a synaptic distribution of GABAB1 isoforms that agrees with the observed functional differences. Transfected CA3 neurons selectively express GABAB1a in distal axons, suggesting that the sushi repeats, a conserved protein interaction motif, specify heteroreceptor localization. The constitutive absence of GABAB1a but not GABAB1b results in impaired synaptic plasticity and hippocampus-dependent memory, emphasizing molecular differences in synaptic GABAB functions.
机译:GABA B受体是大脑中主要的抑制性神经递质,γ-氨基丁酸(GABA)的G蛋白偶联受体。 GABAB系统中的分子多样性来自于GABAB1a和GABAB1b亚基同工型,它们的胞外域仅因GABAB1a独特的一对寿司重复而不同。使用组合的遗传,生理和形态学方法,我们现在证明GABA B1亚型本地化到不同的突触位点,并在体内传递单独的功能。在海马CA3到CA1的突触中,GABA B1a组装异源受体抑制谷氨酸释放,而GABA B1b主要介导突触后抑制。电子显微镜显示GABAB1亚型的突触分布与观察到的功能差异相符。转染的CA3神经元在远端轴突中选择性表达GABAB1a,表明寿司重复序列(一种保守的蛋白质相互作用基序)指定了异源受体定位。 GABAB1a的组成型缺失而不是GABAB1b的缺失导致突触可塑性和海马依赖性记忆受损,强调突触GABAB功能的分子差异。

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