线粒体GPX4乙化参与诱导的细胞亡
Yue-Yue Guo1, Nan-Nan Liang1, Xiao-Yi Zhang1
1Department of Toxicology, Anhui Medical University, Hefei, 230032, China.
Redox biology
|May 11, 2024
概括
暴露于会通过铁死来触发细胞死亡,通过破坏脂质代谢和减少SIRT3,导致GPX4乙化. 这一途径与引起的急性损伤有关.
科学领域:
- 环境毒理学环境毒理学
- 细胞生物学 细胞生物学
- 线粒体功能障碍 线粒体功能障碍
背景情况:
- (Cd) 等环境压力因素越来越多地被认为是急性损伤 (AKI) 的诱导因素.
- 了解Cd诱导的细胞损伤的机制,特别是铁亡,对于开发有效的干预措施至关重要.
- 脂质代谢和线粒体功能的改变与AKI病变产生有关.
研究的目的:
- 为了研究暴露对细胞亡的影响.
- 阐明甲基酸 (ARA) 代谢途径和线粒体蛋白在Cd诱导的铁亡中的作用.
- 探索尼古丁胺胺 mononucleotide (NMN) 对抗Cd诱导的损伤的潜在治疗作用.
主要方法:
- 在Cd暴露的小鼠脏中进行转录学和向代谢学分析.
- 在体外实验中使用暴露于Cd.的HK-2细胞进行实验.
- 线粒体超结构分析和关键蛋白质 (SIRT3,GPX4) 和脂质 (氧化ARA代谢物,4-HNE,MDA) 的评估.
- 使用Sirt3淘汰赛小鼠和NMN治疗细胞/小鼠的实验.
主要成果:
- 暴露于Cd破坏了ARA代谢途径,在小鼠脏和HK-2细胞中增加了氧化ARA代谢物和脂质过氧化标志物 (4-HNE,MDA).
- 线粒体的完整性受到损害,Cd暴露的脏和细胞中的晶状体减少和氧化脂质升高.
- SIRT3水平下降,导致乙化增加和GPX4水平降低,这是一个关键的铁灭抑制剂.
- 在Sirt3淘汰赛小鼠中,GPX4乙化和铁性恶化,但通过NMN治疗得到缓解,这也减少了线粒体脂质过氧化.
结论:
- 诱导的细胞铁灭症涉及到ARA代谢和线粒体功能障碍的破坏.
- 通过增加线粒体GPX4乙化,SIRT3的降低调节有助于Cd引起的铁化.
- NMN对Cd诱导的细胞铁亡具有保护作用,这表明其具有治疗潜力.
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