腹部 tegmental 区域GABA 投射暂停累积胆能内神经元以增强关联性学习
Matthew T C Brown1, Kelly R Tan, Eoin C O'Connor
1Department of Basic Neurosciences, Medical Faculty, University of Geneva, CH-1211 Geneva, Switzerland.
Nature
|November 27, 2012
概括
腹部体区域 (VTA) 的GABA神经元抑制体内核 (NAc) 胆性内部神经元,增强刺激结果学习. 这种VTA-NAc途径完善了大脑如何学习与重要环境线索的关联.
科学领域:
- 神经科学是一个神经科学.
- 行为神经科学 行为神经科学
- 细胞神经科学 细胞神经科学
背景情况:
- 腹部体区域 (VTA) 和体核 (NAc) 是处理动机相关刺激的关键.
- 传统上认为VTA中的多巴胺神经元调解VTA-NAc通信以获得奖励学习.
- 在向NAc投射的VTA中释放GABA (γ-氨基黄油酸) 神经元的作用仍然不太清楚.
研究的目的:
- 研究从VTA GABA神经元到NAc的长距离抑制投射的细胞标和功能意义.
- 阐明VTA GABA投影神经元在刺激结果学习中的作用.
主要方法:
- 光遗传学与动物模型中的结构成像和电生理学相结合.
- 在NAc神经元中记录抑制后突触电流.
- 涉及刺激-结果关联学习和歧视任务的行为实验.
主要成果:
- VTA GABA投射神经元通过多个突触接触选择性地准和抑制NAc胆能内神经元 (CIN).
- 这种VTA-NAc GABAergic投射的激活会导致CIN活动暂停,模仿学习过程中看到的模式.
- 在行为小鼠中抑制CIN改善了与厌恶结果相关的刺激的歧视.
结论:
- VTA GABA投射神经元为NAc提供了一个新的抑制途径,调节胆固醇活性.
- 这一途径通过调节NAc CINs来增强刺激结果学习.
- VTA GABA神经元作为VTA对NAc的突出性传播的关键编排者,影响多巴胺和胆固醇系统.
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