信号转导通路 介导 Carotid 身体依赖的交感激活和高血压 通过慢性间歇性低氧
Ying-Jie Peng1, Jayasri Nanduri1, Ning Wang1
1Institute for Integrative Physiology, Department of Medicine, Pritzker School of Medicine, University of Chicago, Chicago, IL 60637, USA.
Function (Oxford, England)
|January 23, 2025
概括
在阻塞性睡眠呼吸暂停 (OSA) 中,慢性间歇性缺氧 (CIH) 激活了心动脉体 (CB) 化学反射,导致高血压. 这项研究揭示了依赖基基环酶3 (Adcy3) 的cAMP信号通过硫化 (H2S) 和Olfr78.8介导这种反应.
科学领域:
- 生理学 生理学 生理学
- 分子生物学分子生物学
- 心血管研究研究心血管研究
背景情况:
- 阻塞性睡眠呼吸暂停 (OSA) 与交感性过度活动和高血压有关,在慢性间歇性缺氧 (CIH) 期间由过度活跃的动脉体 (CB) 化学反射驱动.
- 作用于嗅觉受体78 (Olfr78) 的硫化 (H2S) 与CIH的CB激活有关,但下游途径尚不清楚.
- 气味受体信号传输通常涉及腺基酶3 (Adcy3) 和循环腺单酸盐 (cAMP).
研究的目的:
- 研究Adcy3依赖的cAMP信号在调解CB和对CIH的同情反应中的作用.
主要方法:
- 用于Adcy3,Cth (编码为CSE),Olfr78和Cnga2.2的无效小鼠被使用.
- 在CIH条件下测量CB组织中的cAMP水平.
- 在突变小鼠中评估了CB激活,质细胞Ca2+流入,以及对CIH反应的交感神经活动.
主要成果:
- CIH增加了CB cAMP水平,这种效应在Adcy3,Cth和Olfr78虚值小鼠中被取消.
- 来自Cth和Olfr78突变的CBs对CIH没有表现出持续硫化反应,这表明H2S/Olfr78是在Adcy3.3的上游.
- 在Cnga2和Adcy3突变体中,CIH诱导的质细胞Ca2+流入受损.
- Adcy3无基因小鼠没有表现出由CIH引起的CB或同情激活.
结论:
- 在CIH期间,依赖于Adcy3的cAMP是H2S/Olfr78信号在CB中的关键下游媒介.
- 这一途径对于CIH诱导的CB激活,同情性多动性和OSA中的高血压至关重要.
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