铁化在糖尿病视网膜病变中线粒体损伤中的作用
Pooja Malaviya1, Jay Kumar1, Renu A Kowluru1
1Kresge Eye Institute, Wayne State University, Detroit, MI, USA.
Free radical biology & medicine
|October 21, 2024
概括
糖尿病视网膜病变涉及氧化应激和线粒体损伤. 向NADPH氧化酶2 (Nox2) 和铁亡可能会打破自由基的循环,为糖尿病视网膜病变提供新的治疗方法.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 眼科医生 眼科 眼科
背景情况:
- 糖尿病视网膜病变 (DR) 是糖尿病的一种并发症,其特征是氧化应激和线粒体损伤.
- 激活NADPH氧化酶2 (Nox2) 会产生活性氧物种 (ROS),从而启动视网膜细胞的损伤循环.
- 这种氧化应激会导致脂质过氧化和铁亡,这是一种调节细胞死亡的形式,涉及铁和脂质过氧化物的积累.
研究的目的:
- 为了研究线粒体铁死在糖尿病视网膜病变中的作用.
- 探索Nox2介导的ROS生产对DR中线粒体损伤和铁亡的贡献.
- 评估针对DR的Nox2和铁亡途径的治疗潜力.
主要方法:
- 人类视网膜内皮细胞在高葡萄糖条件下培养 (5mM或20mM D-葡萄糖).
- 细胞被使用Nox2抑制剂 (apocynin,EHop-016,Gp91 ds-tat),铁死抑制剂 (ferrostatin-1,deferoxamine) 或激活剂 (RSL3) 治疗.
- 细胞和线粒体ROS,脂质过氧化物 (LPOs),铁含量,谷氨过氧化酶4 (GPx4) 活性,线粒体完整性和细胞死亡的量化.
主要成果:
- 高葡萄糖显著增加了ROS,LPOs和铁,同时降低了细胞质和线粒体中的GPx4活性.
- 诺克斯2和铁灭菌抑制剂减弱了葡萄糖诱导的铁灭菌标记物,线粒体损伤和细胞死亡.
- 细胞质ROS增加后,线粒体中铁亡标记物增加,这表明细胞质ROS驱动线粒体铁亡.
结论:
- 通过nox2介导的ROS产生有助于糖尿病视网膜病变中的线粒体铁亡.
- 抑制Nox2和铁亡途径可以防止高葡萄糖诱导的线粒体损伤和细胞死亡.
- 准Nox2-ferroptosis轴为预防或减缓糖尿病视网膜病变的进展提供了一个有希望的治疗策略.
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