顺序素1 (p62) 通过稳定缺氧诱导因子1α和核因子红色素2相关因子2来缓解缺氧诱导的心脏功能障碍
Rajeshwary Ghosh1,2, Amir Nima Fatahian1, Omid M T Rouzbehani1
1Department of Nutrition and Integrative Physiology, College of Health, University of Utah, Salt Lake City, UT 84112, USA.
Cardiovascular research
|February 9, 2024
概括
心脏序列组1 (p62) 蛋白质保护心脏免受氧气不足引起的心脏损伤. 失去p62会损害关键的信号通路,导致心脏功能障碍和细胞死亡.
科学领域:
- 心血管生物学 心血管生物学
- 分子医学是分子医学.
- 细胞信号传输 细胞信号传输
背景情况:
- 缺血性心脏病 (IHD) 是心力衰竭的主要原因,缺氧会加剧心脏损伤.
- 顺序素1 (p62) 是一种适应蛋白,在心肌细胞中表达高,但其在心脏生理学中的作用尚不清楚.
- 了解p62的功能对于制定针对IHD诱导的心脏病理的策略至关重要.
研究的目的:
- 研究心肌细胞特异性p62在心脏对缺氧反应中的作用.
- 为了确定p62缺乏是否会影响缺氧诱导因子1α (Hif-1α) 和核因子红色素2相关因子2 (Nrf2) 信号传递.
- 阐明p62在低氧压力下影响心脏功能的机制.
主要方法:
- 生成的成年小鼠具有生殖线和可诱导的心肌细胞特异性p62删除.
- 进行了转录基因分析,以评估p62缺陷心脏中的基因表达变化.
- 利用H9c2心肌细胞细胞系研究p62,Hif-1α和Nrf2在低氧状态下的相互作用的分子机制.
- 评估了Nrf2.2的蛋白质含量,核转位,无处不在和转录活性.
主要成果:
- 在低氧条件下,心肌细胞p62删除导致心脏功能障碍,氧化应激和细胞死亡.
- 缺少p62会影响心脏中的Hif-1α和Nrf2转录活性.
- 心肌细胞中p62的丧失降低了Hif-1α和Nrf2蛋白水平以及Nrf2核转位.
- 缺少p62增加了Nrf2无化和通过Cullin 3进行蛋白质体降解,而p62增加稳定了Nrf2.
结论:
- 心脏p62对缺氧诱导的心脏功能障碍起着关键的心脏保护作用.
- p62稳定了Hif-1α和Nrf2,在低氧压力下保留了它们的转录活性.
- 准p62可能为减轻与IHD和缺氧相关的心力衰竭提供治疗策略.
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