ангиотензин-II 在心力衰竭的老鼠中驱动微质血管相互作用的变化
bioRxiv : the preprint server for biology
|January 8, 2024
概括
心力衰竭通过增加大脑血管附近的微质细胞引发神经炎症. 阻断 ангиотензин II AT1a 受体使这种相互作用正常化,为心力衰竭相关的认知问题提供了潜在的治疗方法.
科学领域:
- 神经科学是一个神经科学.
- 心血管科学 心血管科学
- 免疫学 免疫学 免疫学
背景情况:
- 中枢神经系统中的微质激活和促炎性细胞因子释放与心力衰竭 (HF) 并发症有关.
- 现有的研究强调了海马体中的 ангиотензин II (AngII) 信号传递,但缺乏关于高血压中微质血管相互作用的细节.
- 微质细胞和大脑的微血管之间的相互作用对血脑屏障的完整性和大脑血流至关重要.
研究的目的:
- 为了研究高压对大脑中微质血管界面的影响.
- 阐明 ангиотензин II (AngII) 信号传递在高血压诱导的微质血管相互作用中的作用.
- 探索潜在的治疗策略,以高频率患者的神经炎症为目标.
主要方法:
- 使用已确定的缺血性心力衰竭 (HF) 鼠标模型.
- 在海马组织中量化血管相关的微质细胞 (VAM).
- 评估了AngII AT1a受体和TNFa表达.
- 在假冒和高压大鼠中服用AngII和AT1a受体抑制剂 (AT1aR).
主要成果:
- 高频率大鼠在海马体中表现出增加的VAM,并增加了AngII AT1a受体表达.
- 在假老鼠中,急性AngII给药诱导了微质向周围血管空间的招募,并增加了TNFa.
- 在高血压大鼠中,AT1aR抑制剂治疗阻止了周血管微质的招募,使水平正常化.
结论:
- 心力衰竭改变了大脑的微质血管接口,其特点是血管相关的微质细胞增加.
- ангиотензин II AT1a 受体信号传递中介于HF诱导的微质招募到大脑血管系统.
- 通过AT1aR阻断向微质血管相互作用,为心血管疾病中神经炎症提供了一种新的治疗方法.
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