摘要
衰老过程在不同程度上恶化器官的功能,导致其抵抗压力、损害和疾病的能力逐渐下降。除了代谢控制和基因表达的改变外,衰老的速度与产生大量活性氧(ROS)有关。自由基生物学的基本观点是活性氧(reactive oxygen species, ROS)和自由基具有毒性,大多对靶标造成直接的生物损伤,是氧化应激的主要原因。细胞中不同的酶和非酶化合物在中和这种毒性中有作用。衰老过程中的氧化损伤大多是高的,特别是在特定的分子靶点,如线粒体DNA和乌头酸酶,线粒体中的氧化应激可以通过内在的细胞凋亡引起组织衰老。线粒体的功能和形态随着衰老而受损,这是由于过氧化氢生成和细胞器大小的增加而导致膜电位下降。端粒可能是复制性衰老的重要触发器。氧化应激会加速端粒的丧失,而抗氧化剂则会减缓它的丧失。氧化应激是端粒缩短的关键调节因子,端粒驱动的复制性衰老主要是一种应激反应。与年龄相关的线粒体DNA突变和蛋白质功能障碍在大脑和骨骼肌等器官中聚集,从而在很大程度上促进了这些有丝分裂后组织的衰老。衰老过程主要是由于有害物质对某些大分子如蛋白质、DNA和脂质造成的累积损害。非功能性氧化蛋白的降解是细胞抗氧化防御的关键部分,这些蛋白的清除通过细胞自噬发生,这被称为线粒体的自噬。
关键词: 线粒体功能障碍,活性氧,衰老,衰老,氧化应激,细胞凋亡。
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