Opposite actions of alcohol on tonic GABA(A) receptor currents mediated by nNOS and PKC activity.

Opposite actions of alcohol on tonic GABA(A) receptor currents mediated by nNOS and PKC activity.
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DOI:
10.1038/nn.3559
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发表时间:
2013-12
影响因子:
25
通讯作者:
Rossi, David J.
Rossi, David J.
中科院分区:
医学1区
文献类型:
--
作者:
Kaplan, Joshua S.;Mohr, Claudia;Rossi, David J.

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调节酒精引起的遗传变异的分子机制尚不清楚。我们发现酒精对行为敏感、低饮酒量的Sprague道利大鼠和DBA/2小鼠以及行为不敏感、高饮酒量的C57 BL/6小鼠小脑颗粒细胞GABAA受体(GABAAR)的抑制有相反的作用(增强或抑制)。酒精对GC GABAAR抑制的影响由两种相反效应之间的平衡决定:通过酒精抑制一氧化氮合酶(NOS)增强突触前囊泡释放GABA,以及直接抑制突触后GABAAR的活性。这两个过程的平衡是由神经元NOS(nNOS)和突触后PKC活性的差异表达决定的,这两者在啮齿动物基因型中各不相同。这些研究结果确定了相反的分子过程,差异控制的大小和极性的GABAAR反应的酒精在啮齿动物基因型。
The molecular mechanisms that mediate genetic variability in response to alcohol are unclear. We find that alcohol has opposite actions (enhancement or suppression) on GABAA receptor (GABAAR) inhibition in granule cells (GCs) of the cerebellum from behaviorally sensitive, low-alcohol consuming Sprague Dawley rats and DBA/2 mice and behaviorally insensitive, high-alcohol consuming C57BL/6 mice, respectively. The impact of alcohol on GC GABAAR inhibition is determined by a balance between two opposing effects: enhanced presynaptic vesicular release of GABA via alcohol inhibition of nitric oxide synthase (NOS), and a direct suppression of the activity of postsynaptic GABAARs. The balance of these two processes is determined by differential expression of neuronal NOS (nNOS) and postsynaptic PKC activity, both of which vary across rodent genotypes. These findings identify opposing molecular processes that differentially control the magnitude and polarity of GABAAR responses to alcohol across rodent genotypes.
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