内皮细胞端粒功能障碍诱导衰老,并导致血管和代谢障碍
Samuel I Bloom1, Yu Liu2,3, Jordan R Tucker3
1Department of Nutrition and Integrative Physiology, The University of Utah, Salt Lake City, Utah, USA.
Aging cell
|June 1, 2023
概括
衰老会导致内皮细胞的端粒功能障碍,导致细胞衰老. 这种衰老会增加氧化应激和炎症,损害心血管和代谢功能.
科学领域:
- 心血管生物学 心血管生物学
- 细胞衰老 细胞衰老
- 分子生物学分子生物学
背景情况:
- 衰老与增加的氧化应激和炎症有关,损害内皮功能并导致心血管疾病 (CVD).
- 衰老的内皮细胞是这种与年龄有关的氧化应激和炎症的潜在来源.
- 细胞衰老是一种由各种有害刺激引发的细胞循环停止状态.
研究的目的:
- 通过端粒功能障碍来研究晚年诱导内皮细胞衰老的假设.
- 阐明端粒功能障碍在与年龄相关的内皮细胞衰老中的作用及其功能后果.
主要方法:
- 从老年和年轻个体的人类和小鼠内皮细胞中分析端粒完整性和DNA损伤信号.
- 在年轻的小鼠内皮细胞中试验减少端粒重复结合因子2 (Trf2),以诱导端粒功能障碍和衰老.
- 评估炎症信号,氧化应激,内皮功能和葡萄糖耐受性,以应对诱导的内皮细胞衰老.
主要成果:
- 晚年与功能障碍的端粒增加和内皮细胞中DNA损伤信号的增加有关.
- 在年轻的内皮细胞中减少的Trf2诱导了端粒功能障碍,导致细胞衰老.
- 内皮细胞端粒功能障碍和衰老增加了炎症信号,氧化应激和内皮功能受损.
- 诱导的内皮细胞衰老对葡萄糖耐受性产生了负面影响,可能是通过全身炎症和微血管变化.
结论:
- 与年龄相关的端粒功能障碍是驱动内皮细胞衰老的关键机制.
- 衰老的内皮细胞对与年龄相关的氧化应激和炎症的增加有显著的贡献.
- 这些细胞变化损害了动脉和代谢功能,突出了衰老生物学中的新途径.
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