多巴胺通过激活奖励反应的杏仁体神经元来诱导恐惧灭绝
Xiangyu Zhang1,2, Katelyn Flick1,2, Marianna Rizzo1,2,3
1The Picower Institute for Learning and Memory, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
从腹膜区域 (VTA) 发出的多巴胺信号驱动着不同的底侧杏仁体 (BLA) 神经元群体的恐惧灭绝. 这种多巴胺 (DA) 活动调节了这些特定的BLA神经元中的恐惧灭绝记忆形成和学习.
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
- 分子精神病学分子精神病学
背景情况:
- 消除恐惧对于适应性行为和治疗焦虑障碍至关重要.
- 损害恐惧灭绝与创伤后应激障碍 (PTSD) 有关.
- 情境依赖的恐惧记忆涉及基底侧桃体 (BLA) 中特定的神经元群体.
研究的目的:
- 为了调查恐惧的教学信号的神经基础灭绝记忆形成.
- 确定腹膜区域 (VTA) 多巴胺激应信号在恐惧灭绝中的作用.
- 为了阐明在恐惧灭绝过程中,BLA神经元群体是如何被调节的.
主要方法:
- 利用光纤摄影仪记录了BLA中的多巴胺活性.
- 采用了对VTA-BLA通路的投影特异性光遗传学操纵.
- 在基因标记的BLA恐惧和灭绝恩格拉姆细胞 (Ppp1r1b和Rspo2) 中分析了神经元活动.
主要成果:
- VTA多巴胺基信号直接驱动着在不同的BLA神经元群体中恐惧灭绝.
- 在BLA灭绝神经元中,多巴胺 (DA) 活性被时间锁定到结停止,与学习相关.
- 通过不同的多巴胺受体,VTA DA投影通过不同的多巴胺受体不同地激活前部 (恐惧) 和后部 (灭绝) BLA神经元.
- 光遗传激活/抑制VTA DA投影双向控制的恐惧灭绝.
结论:
- 来自VTA的多巴胺激应信号是恐惧灭绝记忆的关键教学信号.
- 独特的VTA-BLA通路双向调节基于神经元群体的恐惧灭绝.
- 这一发现为焦虑障碍的潜在治疗目标提供了潜在的治疗目标,焦虑障碍的特征是恐惧的消失受损.
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