在Prox1上的禁食敏感SUMO开关控制肝脏胆固醇代谢.
Ana Jimena Alfaro1,2,3, Claudia Dittner4, Janina Becker4
1Institute for Diabetes and Cancer, Helmholtz Munich, Neuherberg, Germany.
EMBO reports
|August 10, 2023
概括
SUMOylation of Prox1,一个关键的转录因子,调节肝脏的禁食新陈代谢. 肥胖症中的SUMOylation受损破坏了这一点,但针对Prox1 SUMOylation可能会提供新的代谢健康策略.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 代谢疾病 代谢疾病
背景情况:
- 过多的营养积累会损害肝功能,并与与肥胖相关的非酒精性脂肪性肝病 (NAFLD) 有关.
- 介导肝细胞适应肥胖原性饮食的分子信号尚未完全理解.
- 通过小型泛胺类修饰剂 (SUMO) 的翻译后修饰动态调节细胞过程,包括基因表达.
研究的目的:
- 调查Prox1 SUMOylation在调节肝脏禁食新陈代谢中的作用.
- 为了确定Prox1对营养敏感的SUMOylation是否在饮食诱导的肥胖中发生变化.
- 探索调节Prox1 SUMOylation对代谢健康的治疗潜力.
主要方法:
- 在不同养条件下 (ad libitum,refed,禁食) 的小鼠中分析Prox1 SUMOylation状态.
- 生产和使用肝细胞选择性SUMOylation缺陷的Prox1突变小鼠.
- 高脂肪/高果糖饮食食诱发肥胖.
- 测量全身胆固醇水平和肝胆酸排毒通路.
主要成果:
- 在 lysine 556 中的 Prox1 SUMOylation 对正常小鼠的禁食线索敏感,但在饮食引起的肥胖症中变得不那么敏感.
- 一种SUMOylation缺陷的Prox1突变体的肝细胞特异性内置降低了全身胆固醇.
- 在肥胖小鼠中,这种遗传修饰诱导了肝胆酸排毒通路在禁食期间.
结论:
- Prox1 SUMOylation作为肝脏禁食新陈代谢的营养敏感调节剂.
- 不调节的Prox1 SUMOylation在肥胖中有助于代谢功能障碍.
- 针对Prox1 SUMOylation开关可能是代谢疾病的新治疗策略.
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