通过脑干上腺神经元控制跨行为状态的血压变化
George M P R Souza1,2, Harsha Thakkalapally1, Faye E Berry1
1Department of Pharmacology, University of Virginia, Charlottesville (G.M.P.R.S., H.T., F.E.B., L.F.W., U.M.A., D.S.S., S.B.G.A.).
在行为状态变化过程中,面腹侧髓C1 (RVLMC1) 神经元稳定血压. 破坏这些神经元会增加血压变化,揭示了血压不稳定的关键机制.
科学领域:
- 神经科学是一个神经科学.
- 心血管生理学心血管生理学
- 自主神经系统的调节规则
背景情况:
- 短期血压 (BP) 变化是心血管和脑血管风险的重要预测因素.
- 控制不同行为状态的BP变异的中枢神经机制尚未得到充分理解.
研究的目的:
- 为了研究面腹侧髓C1 (RVLMC1) 神经元在睡眠-清醒过渡和体育活动期间调节短期血压中的作用.
- 为了确定动脉巴罗反射反如何影响RVLMC1的神经活动.
- 评估RVLMC1神经元功能对血压稳定性的影响.
主要方法:
- 利用基因向纤维光度测量记录RVLMC1神经元活动在各种行为状态的自由行为大鼠.
- 采用中枢中枢膜化来评估巴罗受体反对RVLMC1神经元活动的贡献.
- 进行RVLMC1神经元的选择性基因切除,以确定它们在血压调节中的作用.
主要成果:
- RVLMC1神经元显示状态依赖的活动,在唤醒时增加,在REM睡眠期间持续,并在体育活动期间招募.
- 巴罗反射输入调节RVLMC1神经元活动,以响应血压变化和睡眠状态过渡.
- 废除RVLMC1神经元并没有影响平均血压,但在兴奋和运动期间引起显著的血压不稳定.
结论:
- 在行为状态过渡期间,RVLMC1神经元对于稳定BP至关重要,通过将中央兴奋信号与巴罗受体反集成,从而稳定BP.
- 扰乱RVLMC1神经元导致短期高血压变异性,这表明病理性血压不稳定的神经基础.
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