甘基林缺乏重新编程肝脏内葡萄糖和脂质代谢,延迟肝脏再生
Yitian Liu1, Yiwei Sun1,2, Lv Jin1
1International Cooperation Laboratory on Signal Transduction, National Center for Liver Cancer, Ministry of Education Key Laboratory on Signaling Regulation and Targeting Therapy of Liver Cancer, Shanghai Key Laboratory of Hepato-biliary Tumor Biology, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University/Naval Medical University, Shanghai 200438, China.
Acta biochimica et biophysica Sinica
|June 6, 2025
概括
甘基林通过FOXO1通路调节糖原分解和脂肪酸吸收,促进肝脏再生. 甘基林缺乏会损害肝脏的再生,突出其在代谢适应和肝细胞增殖中的关键作用.
科学领域:
- 肝病学和分子生物学
- 代谢调节 代谢调节 代谢调节
- 细胞增殖 细胞的增殖
背景情况:
- 肝脏再生需要对肝细胞增殖进行代谢重编程.
- 甘基林在肝脏再生和代谢适应中的作用以前尚不清楚.
- 众所周知,甘基林可促进肝纤维化和癌症.
研究的目的:
- 研究甘基林在肝脏再生期间代谢适应中的作用.
- 阐明甘基林影响肝脏再生的分子机制.
- 探索向甘基林在肝衰竭中的治疗潜力.
主要方法:
- 使用了缺乏甘基林的肝脏特异性淘汰赛小鼠 (Gank).
- 进行了部分肝切除术 (PHx) 以诱导肝脏再生.
- 分析了糖原积累,糖原溶解,脂肪酸吸收和基因表达 (Pygl, Cd36).
- 通过ubiquitination和proteasomal降解试验研究了甘基林-FOXO1相互作用.
- 评估了PYGL抑制对肝脏再生的影响.
主要成果:
- 甘基林缺乏导致肝脏缩和异常的糖原积累.
- 甘基林表达在PHx后增加,而Gank△Hep/Y小鼠显示再生受损.
- 在Gank△Hep/Y小鼠中,受损的再生包括延迟的肝脏与身体重量比重恢复,减弱的糖原分解和减少的脂肪酸摄取.
- 甘基林激活Pygl和Cd36,这对糖原分解和脂质吸收至关重要.
- 甘基林促进FOXO1降解,对Pygl和Cd36转录进行上调.
- 药理上抑制PYGL活性阻碍了肝脏的再生.
结论:
- 甘基林是肝脏再生的关键调节剂,对于代谢重编程至关重要.
- 甘基林通过FOXO1-PYGL/CD36轴将代谢适应与增殖信号结合起来.
- 向甘基林/FOXO1通路为增强肝脏再生和治疗肝功能不全提供了治疗潜力.
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