在缺乏FBP1的肝脏中,ChREBP调解了代谢重塑
Chen-Ma Wang1, Qiu-Fang Bai2, Ya-Jin Liu1
1NHC Key Lab of Hormones and Development and Tianjin Key Lab of Metabolic Diseases, Tianjin Medical University Chu Hsien-I Memorial Hospital and Institute of Endocrinology, Tianjin, People's Republic of China.
果糖-1,6-双酸酶1 (FBP1) 缺乏导致脂肪肝,通过激活碳水化合物反应元素结合蛋白 (ChREBP). 在缺乏FBP1的成年人中,ChREBP促进脂质积累,但可以防止肝损伤.
科学领域:
- 代谢调节 代谢调节 代谢调节
- 肝脏生理学 肝脏生理学
- 酶的功能 酶的功能
背景情况:
- 果糖-1,6-双酸酶1 (FBP1) 缺乏与脂肪肝有关,但机制尚不清楚.
- 碳水化合物反应元素结合蛋白 (ChREBP) 是葡萄糖和脂质代谢的关键调节者.
研究的目的:
- 调查ChREBP在成人FBP1缺陷肝脏中代谢变化的调解中的作用.
- 阐明在FBP1缺陷的背景下ChREBP激活的生理意义.
主要方法:
- 成年小鼠Fbp1基因的诱导性肝脏特异性删除.
- 分析肝脏的新生脂质生成 (DNL),甘油三积累和血β-基酸盐水平.
- 评估ChREBP激活,基因表达和下游影响,包括mTOR信号和氧化应激.
- 代谢学分析以确定受ChREBP缺失影响的关键代谢物.
主要成果:
- 缺乏FBP1导致了渐进的肝扩大,肝硬化,DNL增加和血β-基酸盐的减少.
- 在缺乏FBP1的肝脏中观察到持久的ChrEBP激活,即使在禁食期间,促进脂质生成和脂肪酸氧化.
- 肝脏特异性ChREBP干扰部分逆转了DNL和甘油三积累,但恶化了肝壮病,肝损伤,能量缺乏和氧化应激.
- 在缺乏FBP1的肝脏中,ChREBP的缺失增加了包括基酸,糖酸,脂和胺在内的特定代谢物.
结论:
- 过度激活ChREBP途径调解了缺乏FBP1的肝脏中的代谢重塑,导致渐进性肝硬化.
- 在没有FBP1的情况下,ChREBP通过减轻能量赤字和氧化应激减轻肝损伤的保护作用.
- 这些发现突出了复杂的相互作用,其中ChREBP促进脂质积累,同时在特定的代谢环境中提供对严重肝损伤的保护.
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