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干扰的底侧杏仁体电路支持抑郁状态的负价值偏差
Mathilde Bigot1,2, Claire-Hélène De Badts1, Axel Benchetrit1
1Institut Pasteur, Université Paris Cité, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 3571, Perception and Action Unit, F-75015, Paris, France.
Translational psychiatry
|September 19, 2024
概括
抑郁症会导致人们对刺激的感知产生负面偏见. 特定的底侧杏仁体 (BLA) 电路中断在小鼠模型中,与皮质类固醇 (CORT) 相关,是这种偏差的基础,提供了新的治疗点.
科学领域:
- 神经科学是一个神经科学.
- 精神病学是一个精神病学.
- 分子生物学分子生物学
背景情况:
- 抑郁症的特点是负面偏见,影响情绪处理,注意力和记忆力.
- 这种偏见导致积极刺激的吸引力下降,对负面刺激的厌恶增加.
- 抑郁症中这种负面偏差背后的神经回路尚不清楚.
研究的目的:
- 为了研究底侧杏仁体 (BLA) 中的神经回路,负责抑郁症的负价值偏差.
- 在小鼠模型中探索慢性皮质 (CORT) 给药对BLA电路活性的影响.
- 评估针对BLA电路用于抑郁症治疗的潜力.
主要方法:
- 利用慢性CORT管理诱导的抑郁症的小鼠模型.
- 采用基于CTB和狂犬病的追踪与ex vivo神经元活动测量相结合.
- 研究了BLA电路活动,特别是BLA-to-NAc和BLA-to-CeA通路.
- 使用化学遗传学调节BLA-to-NAc神经元活动.
主要成果:
- 慢性CORT诱导了小鼠嗅觉刺激价值归因的负偏差,反映了人类的观察.
- 抑郁状态显示BLA电路活动受到干扰:BLA-to-NAc神经元招募减少,BLA-to-CeA神经元招募增加.
- BLA-to-NAc神经元的化学遗传过活化部分扭转了观察到的功能障碍.
- 在BLA活动的变化与突触连接的变化从 thalamus 的副腹腔核相关联.
结论:
- 特定的BLA电路改变,特别是涉及BLA-to-NAc和BLA-to-CeA通路,支持抑郁症的负价值偏差.
- 这些发现突显了BLA电路在抑郁症病理生理学中的作用.
- 这项研究为抑郁机制和针对BLA电路的潜在治疗策略提供了新的见解.
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