Repeated cocaine weakens GABA(B)-Girk signaling in layer 5/6 pyramidal neurons in the prelimbic cortex.

Repeated cocaine weakens GABA(B)-Girk signaling in layer 5/6 pyramidal neurons in the prelimbic cortex.
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DOI:
10.1016/j.neuron.2013.07.019
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发表时间:
2013-10-02
期刊:
影响因子:
16.2
通讯作者:
Wickman K
Wickman K
中科院分区:
医学1区
文献类型:
--
作者:
Hearing M;Kotecki L;Marron Fernandez de Velasco E;Fajardo-Serrano A;Chung HJ;Luján R;Wickman K

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重复可卡因暴露触发内侧前额叶皮层(mPFC)中第5/6层多巴胺能神经元的适应,促进行为敏感化和药物寻求行为。虽然这些行为涉及代谢抑制信号的抑制,但其潜在机制尚不清楚。在这里,我们表明,Girk/KIR 3通道介导的大多数GABAB受体(GABABR)依赖性抑制层5/6锥体神经元的mPFC和重复可卡因抑制这一途径。这种适应是选择性的GABABR依赖的Girk信号在层5/6锥体神经元的前边缘皮层(PrLC),并涉及D1/5多巴胺受体和磷酸化依赖的GABABR和Girk通道的内化。持续抑制背侧mPFC第5/6层的Girk信号增强可卡因诱导的运动活动和封闭的行为敏化。因此,可卡因诱导的抑制GABABR-Girk信号在层5/6锥体神经元的前边缘皮质似乎代表了早期适应促进成瘾相关行为的关键。
Repeated cocaine exposure triggers adaptations in Layer 5/6 glutamatergic neurons in the medial prefrontal cortex (mPFC) that promote behavioral sensitization and drug-seeking behavior. While suppression of metabotropic inhibitory signaling has been implicated in these behaviors, underlying mechanisms are unknown. Here, we show that Girk/KIR3 channels mediate most of the GABAB receptor (GABABR)-dependent inhibition of Layer 5/6 pyramidal neurons in the mPFC and that repeated cocaine suppresses this pathway. This adaptation was selective for GABABR-dependent Girk signaling in Layer 5/6 pyramidal neurons of the prelimbic cortex (PrLC) and involved a D1/5 dopamine receptor- and phosphorylation-dependent internalization of GABABR and Girk channels. Persistent suppression of Girk signaling in Layer 5/6 of the dorsal mPFC enhanced cocaine-induced locomotor activity and occluded behavioral sensitization. Thus, the cocaine-induced suppression of GABABR-Girk signaling in Layer 5/6 pyramidal neurons of the prelimbic cortex appears to represent an early adaptation critical for promoting addiction-related behavior.
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