衰老增加了缺氧诱导的内皮透气性和血脑屏障功能障碍,通过对阿尔金纳-II进行上调
Aging and disease
|February 1, 2024
概括
缺氧会通过增加二型酶 (Arg-II) 在衰老过程中恶化血脑屏障 (BBB) 功能障碍,这会增加线粒体反应性氧物种 (mtROS) 并损害细胞结.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 血管生物学 血管生物学
背景情况:
- 血脑屏障 (BBB) 功能障碍,以增加内皮通透性为标志,在各种疾病中导致神经元损伤.
- 缺氧 (缺氧) 是BBB破坏的重要危险因素,但其潜在的分子机制,特别是老化,尚未完全理解.
- 已知线粒体酶II型 (Arg-II) 促进内皮功能障碍,但其在缺氧诱导的BBB变化中的作用尚未被探索.
研究的目的:
- 调查阿尔金酶II型 (Arg-II) 在低氧诱导的血脑屏障 (BBB) 功能障碍中的作用,特别是在衰老中.
- 阐明将低氧,Arg-II和BBB完整性联系在一起的分子机制.
- 评估Arg-II抑制对低氧诱导的BBB损伤的影响.
主要方法:
- 使用C57BL/6J小鼠模型进行低氧 (8%O224小时) 评估血管Arg-II,细胞-细胞结合蛋白 (ZO-1,ocludin,CD31) 和BBB泄漏在年轻和老小鼠.
- 使用Arg-ii淘汰赛 (Arg-ii-/-) 小鼠来评估Arg-II对缺氧诱导的BBB变化的遗传贡献.
- 在缺氧条件下使用老化的人类大脑微血管内皮细胞 (hCMEC/D3) 培养模型来检查Arg-II增强,结点蛋白水平,透性以及Arg-II基因沉默或线粒体ROS (mtROS) 抑制的影响.
主要成果:
- 低氧增加了老老鼠的血管Arg-II和BBB泄漏,伴随着结蛋白ZO-1,ocludin和CD31水平的降低,在年轻小鼠中没有观察到这些影响.
- 这些因缺氧引起的衰老变化在arg-ii-/-小鼠中被显著抑制,并在衰老的hCMEC/D3细胞中复制.
- 在细胞培养中,缺氧增强了Arg-II,减少了接口蛋白,增加了透性,这是通过Arg-II基因沉默或mtROS抑制来防止的.
结论:
- 酶II型 (Arg-II) 在缺氧诱导的内皮通透性和血脑屏障 (BBB) 功能障碍中发挥着关键作用,特别是在衰老中.
- 在低氧条件下,Arg-II通过增强线粒体活性氧物种 (mtROS) 生成促进BBB功能障碍,导致内皮细胞-细胞结合蛋白减少.
- 向Arg-II或mtROS生产可能提供治疗策略,以保护BBB免受老年人群中缺氧诱导的损伤.
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