氧化应激的细胞外微环境驱动纤维细胞激活和纤维化
Li Li1, Meizhi Lu1, Yiling Peng1
1State Key Laboratory of Organ Failure Research, National Clinical Research Center of Kidney Disease, Guangdong Provincial Institute of Nephrology, and Division of Nephrology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
Redox biology
|September 10, 2023
概括
氨酸过氧化酶-3 (GPX3) 在损伤中的损失会产生氧化应激,通过激活纤维细胞来驱动纤维化. 向NADPH氧化酶-4 (NOX4) 可以减少这种激活并缓解纤维化.
科学领域:
- 腎臟病學 (nephrology) 是一種醫學專業.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 纤维化涉及管状损伤,氧化应激和纤维细胞激活,但它们的相互联系尚不清楚.
- 谷氨过氧化酶-3 (GPX3) 对于控制管表皮中的氧化应激至关重要.
研究的目的:
- 为了研究GPX3枯竭在纤维化中的作用.
- 阐明将GPX3损失,氧化应激和中的纤维细胞激活联系在一起的机制.
主要方法:
- 在慢性病 (CKD) 模型中进行转录分析的RNA测序.
- 脱细胞化细胞外基质 (ECM) 支架研究纤维细胞的行为.
- 用先进氧化蛋白产品 (AOPPs) 和细胞信号抑制剂进行体外实验.
- 在体内研究中,使用NOX4敲击的CKD小鼠模型进行了体内研究.
主要成果:
- 在CKD模型中,GPX3表达的下调,与尼古丁胺胺氨基二核酸 (NADPH) 氧化酶-4 (NOX4) 的增加相关.
- 在ECM中的GPX3耗尽会诱导NOX4,反应性氧物种 (ROS) 生产和纤维细胞激活.
- NOX4的AOPP激活模仿GPX3的损失,通过PKCα/MAPK/STAT3信号促进纤维细胞激活.
- 在体内,NOX4沉默或MAPK抑制会减少纤维细胞激活和纤维化.
结论:
- GPX3的枯竭调节了一个氧化细胞外微环境,驱动纤维化.
- GPX3-NOX4轴是纤维细胞激活和纤维化进展的关键途径.
- 针对细胞外微环境和NOX4信号提供了纤维化潜在的治疗策略.
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