前下丘脑前方方蛋白神经元是谷氨酸性,并促进逃跑行为
Brenton T Laing1, Megan S Anderson1, Jordi Bonaventura2
1Neuronal Circuits and Behavior Section, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD 21224-6823, USA.
Current biology : CB
|July 25, 2023
概括
研究人员在前脑下垂体区域 (AHA) 确定了特定的神经元,这些神经元控制防御行为. 激活这些神经元会触发逃生反应,这对生存和理解PTSD等障碍至关重要.
科学领域:
- 神经科学是一个神经科学.
- 行为生物学 行为生物学
- 神经解剖学是一个神经解剖学.
背景情况:
- 前脑下垂体区域 (AHA) 被公认为其在防御行为中的作用.
- 了解涉及威胁检测和逃跑的特定神经回路对于生存至关重要.
研究的目的:
- 识别和描述AHA中涉及防御反应的特定神经元群体.
- 阐明这些神经元及其预测在调节生存行为中的功能.
主要方法:
- 在AHA中使用基因标记物识别表达帕瓦胺神经元 (AHAPV).
- 在体内功能成像,光遗传学和行为分析 (捕食者暴露,实时位置偏好,捕食者潜伏测试).
- 使用正子发射断层扫描 (PET) 绘制全脑代谢图,并评估神经元切除后的焦虑类行为 (开放场,升高加迷宫).
主要成果:
- AHAPV神经元是谷氨酸性,快速升,并投射到背部前乳母细胞核 (PMD).
- 在捕食者暴露期间,AHAPV神经元的活动增加,它们的激活引起厌恶和逃跑.
- 激活AHAPV →PMD通路会触发逃生;切除会影响逃生,但不会导致类似焦虑的行为.
- 光激活导致下游激活在像杏仁体和黑色物质这样的区域.
结论:
- AHAPV神经元形成一个功能性谷氨酸电路,介导防御行为和逃跑反应.
- 这些发现扩大了对参与战斗或逃跑反应的基因定义神经元的理解.
- 这项研究为研究压力相关疾病,如创伤后应激障碍 (PTSD) 提供了基础.
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