外源H2S启动Nrf2/GPx4/GSH通路,通过促进糖尿病心脏中的Syvn1-Keap1相互作用
Mengyi Wang1, Jingyuan Tang1, Shiwu Zhang1
1Department of Pathophysiology, Harbin Medical University, 150081, Harbin, China.
Cell death discovery
|October 24, 2023
概括
硫化 (H2S) 通过激活Nrf2/GPx4/GSH通路来保护糖尿病心肌病. 这种机制涉及Syvn1介导的Keap1无处不在,减少心脏细胞中的铁和线粒体亡.
科学领域:
- 生物化学 生物化学
- 心脏病学 心脏病学
- 分子生物学分子生物学
背景情况:
- 2型糖尿病 (T2DM) 与过度反应性氧物种 (ROS) 积累有关,导致心脏损伤.
- 糖尿病心肌病 (DCM) 是一个重要的并发症,硫化 (H2S) 显示出减轻心脏损伤的潜力.
- 在DCM中,H2S保护心脏的精确分子机制尚未完全理解.
研究的目的:
- 研究外源硫化 (H2S) 对2型糖尿病小鼠模型中的心脏损伤的保护作用.
- 阐明潜在的分子机制,重点关注Nrf2通路和细胞死亡模式,如铁亡和线粒体亡.
- 为了检查synoviolin (Syvn1) 和Kelch-like ECH相关蛋白1 (Keap1) 相互作用在H2S介导心脏保护中的作用.
主要方法:
- 将NaHS (一种H2S来源) 给db/db小鼠和暴露在高葡萄糖 (HG) 和棕酸盐 (PA) 的HL-1心肌细胞.
- 评估H2S水平,Nrf2/GPx4/GSH通路激活,铁亡和线粒体亡.
- 研究Nrf2倒置效应以及Synoviolin (Syvn1) 在Keap1无化和Nrf2核转移中的作用.
- 分析Cys115部位的Syvn1硫化和Syvn1C115A突变的影响.
主要成果:
- 在HG/PA条件下,糖尿病心脏和心肌细胞中的H2S水平降低了,NaHS恢复了这些水平.
- 外源H2S激活了Nrf2/GPx4/GSH通路,抑制了铁亡,并在db/db小鼠中减轻了线粒体亡.
- NaHS治疗增加了Syvn1的无处不在,促进了Keap1的降解,并促进了Nrf2的核转位,这些影响取决于Syvn1的Cys115硫化.
- Nrf2淘汰或Syvn1 C115A突变部分取消了NaHS的保护作用.
结论:
- 外源H2S通过激活Nrf2/GPx4/GSH通路来保护糖尿病心肌病中的心脏损伤.
- 心脏保护机制涉及H2S诱导的Syvn1硫化,增强其与Keap1的相互作用,促进Nrf2核转位,随后减少铁和线粒体亡.
- 这项研究揭示了在DCM的背景下,通过Syvn1-Keap1轴通过H2S激活Nrf2的新型调节途径.
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