线粒体对热应激的反应:Drosophila中的ROS动态和代谢转变
Adèle Léger1, Léa Herpe1, Nicolas Pichaud1
1New Brunswick Centre for Precision Medicine, Moncton, NB, Canada, E1C8X3; Department of Chemistry and Biochemistry, Université de Moncton, Moncton, NB, Canada, E1A 3E9.
Mitochondrion
|January 27, 2026
概括
温度会影响外热生物的新陈代谢,但其对活性氧物种 (ROS) 生产的影响尚不清楚. 这项研究表明,虽然一些线粒体通路在高温下增加ROS,但另一些线粒体通路在有限的氧化应激下维持呼吸.
科学领域:
- 线粒体生理学线粒体生理学
- 热生物的新陈代谢
- 氧化应激是一种氧化应激.
背景情况:
- 温度显著影响外热生物的新陈代谢,包括线粒体呼吸和酶活性.
- 温度对生态热生物中反应性氧物种 (ROS) 生产的影响尚不清楚.
研究的目的:
- 为了研究隔离的Drosophila melanogaster线粒体中过氧化 (H2O2) 生产的热敏感性.
- 了解不同基质氧化途径如何影响在一系列温度范围内ROS的产生.
主要方法:
- 他们使用了Drosophila melanogaster分离的线粒体.
- 在六个温度 (18-45°C) 下测量了H2O2排放率,在各种条件下:氧化化 (OXPHOS) 与NADH或FADH2相关的基质,以及非化条件.
- 基质/抑制剂组合,包括pyruvate/malate (P/M驱动),用于剖析线粒体功能.
主要成果:
- 在OXPHOS和P/M驱动的呼吸过程中,H2O2排放显示出明显的热敏感性.
- 高温增加了与NADH结合基质的ROS产量,与复合I (CI) 活性和酸盐脱酶 (PDH) 活性降低相关.
- 与FADH2结合的基质在高温下支持呼吸,减少ROS的产生,这表明了限制氧化应激的策略.
结论:
- 线粒体热敏感性涉及ROS代谢的复杂调节.
- 与NADH相关的途径容易增加ROS的产生和高温下功能障碍.
- 在面临热挑战的昆虫中,FADH2-链路提供了一种维持呼吸的潜在机制,同时减轻氧化应激.
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