肝脏的BMAL1和HIF1α调节了依赖时间的缺氧反应,并预防了肝肺样综合征
Vaishnavi Dandavate1, Nityanand Bolshette1, Rachel Van Drunen1
1Department of Biomolecular Sciences, Weizmann Institute of Science, 7610001 Rehovot, Israel.
Cell metabolism
|August 6, 2024
概括
生物钟蛋白BMAL1和HIF1α以时间依赖的方式调节身体对低氧 (低氧) 的反应. 破坏这些蛋白质会导致呼吸问题和增加死亡率,为肝肺综合征提供了洞察力.
科学领域:
- 生理学 生理学 生理学
- 分子生物学分子生物学
- 时间生物学 时间生物学
背景情况:
- 身体对低氧 (低氧) 的反应是暂时调节的,但潜在的分子机制和生理后果仍然不清楚.
- 循环时钟蛋白,如BMAL1,以及缺氧诱导因素,如HIF1α,对于细胞适应至关重要.
- 了解它们的相互作用对于破译缺氧反应和相关病理至关重要.
研究的目的:
- 研究肝脏BMAL1和HIF1α在小鼠低氧反应的昼夜调节中的作用.
- 阐明这种时间调节的分子基础和生理影响.
- 探索肝脏BMAL1/HIF1α功能障碍与肝肺综合征之间的潜在联系.
主要方法:
- 使用了具有影响肝脏BMAL1和HIF1α的遗传修饰的小鼠模型.
- 分析了在一天中不同时间对缺氧的转录反应.
- 评估生理参数,包括血液氧气水平,死亡率,肝功能和肺血管度.
主要成果:
- 大多数缺氧诱导的转录变化取决于BMAL1或HIF1α,不同的和共享的角色根据一天中的时间而异.
- 缺氧期间的HIF1α积累是暂时调节的,并且取决于BMAL1.
- 缺少肝脏BMAL1和HIF1α的小鼠表现出白天依赖的低氧化,增加的死亡率和肝肺综合征的迹象,包括与ERK,eNOS和氧化通道相关的肺血管扩张.
结论:
- 肝脏的BMAL1和HIF1α是缺氧反应的关键,时间依赖的调节者.
- 它们的相互作用影响生理适应缺氧和生存.
- 这些因素的失调提供了对肝肺综合征病理生理学的分子洞察力.
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