缺少ALDH2会通过调节胆酸代谢来加剧MCD饮食诱导的MASLD
Jun Luo1, Zhongshan Lu1, Zibiao Zhong1
1National Quality Control Center for Donated Organ Procurement, Hubei Key Laboratory of Medical Technology on Transplantation, Hubei Clinical Research Center for Natural Polymer Biological Liver, Hubei Engineering Center of Natural Polymer-Based Medical Materials, Zhongnan Hospital of Wuhan University, Institute of Hepatobiliary Diseases of Wuhan University, Transplant Center of Wuhan University, Wuhan, Hubei, China.
脱酶2 (ALDH2) 缺乏会通过破坏胆酸合成,使代谢功能障碍相关的脂肪性肝病 (MASLD) 恶化. 恢复ALDH2功能可能为MASLD提供新的治疗策略.
科学领域:
- 生物化学 生物化学
- 遗传学 是一个遗传学.
- 肝病学 肝病学是一种肝病学.
背景情况:
- 化脱酶2 (ALDH2) 代谢化物,其rs671多态性在东亚人中很常见.
- ALDH2 rs671多态性与代谢功能障碍相关的脂肪性肝病 (MASLD) 风险增加有关,但机制尚不清楚.
研究的目的:
- 阐明ALDH2在MASLD病变发生过程中的作用.
- 研究ALDH2对肝硬化,炎症和纤维化的影响.
- 确定ALDH2在调节肝脂代谢和胆酸合成中的分子机制.
主要方法:
- 评估了MASLD患者的ALDH2活性和一种甲氨酸胆缺乏症 (MCD) 饮食小鼠模型.
- 在MCD饮食小鼠中利用ALDH2激动剂 (Alda-1) 和抑制剂 (胺).
- 在MCD饮食挑战中检查了ALDH2-缺乏 (ALDH2-/-) 的小鼠.
- 在肝脏组织上进行RNA测序 (RNA-seq).
- 在实验室中进行了肝细胞淘汰和ALDH2的过度表达的实验.
- 研究了陈氧胆酸 (CDCA) 对肝细胞的影响.
主要成果:
- 在MASLD患者和MCD饮食模型中,ALDH2活性降低.
- 艾尔达-1治疗减轻了MCD诱导的肥胖症,而胺使其恶化.
- 在小鼠中,ALDH2 缺乏会加剧肝脏肥胖症,炎症和纤维化.
- RNA-seq揭示了下调的氧化7-α氧酶 (Cyp7b1) 并抑制了ALDH2-/-小鼠的FXR/SHP信号,减少了替代胆酸合成.
- 在体外,ALDH2倒置增加了肝脏甘油三 (TG) 积累,而过度表达减少了它.
- 通过CDCA治疗挽救了由ALDH2下调引起的TG积累.
结论:
- 在MASLD中,ALDH2通过减弱肝硬化症起着保护作用.
- ALDH2通过替代胆酸合成途径调节MASLD的进展.
- ALDH2代表了MASLD治疗的潜在治疗标.
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