核受体核心抑制剂非法定地驱动葡萄糖皮质体受体依赖肝脏葡萄糖生成的激活
Amy K Hauck1, Rashid Mehmood1, Bryce J Carpenter1
1Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Nature metabolism
|April 15, 2024
概括
核受体核心抑制剂 (NCoRs) 在肝脏代谢中具有令人惊的非正规激活作用. 由于阻断基因激活,NCoR1和NCoR2的损失会导致脂肪肝和低血糖症.
科学领域:
- 分子生物学分子生物学
- 代谢调节 代谢调节 代谢调节 代谢调节
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 核受体核心抑制剂 (NCoRs) 与基因脱乙酶3 (HDAC3) 形成复合体,以调节基因表达.
- 肝脏中HDAC3的损失导致脂肪肝,这是由于脂质代谢基因的抑制.
- 对于NCoRs在肝脏和全身代谢调节中的特定作用尚未完全理解.
研究的目的:
- 研究NCoR1和NCoR2在肝脏和全身代谢调节中的单独和联合作用.
- 阐明在NCoR淘汰赛模型中观察到的代谢失调背后的机制.
主要方法:
- 成年小鼠中的NCoR1和NCoR2的肝细胞特异双击 (KO).
- 肝脏表型的分析,包括肥胖症和糖原储存.
- 评估葡萄糖原性基因表达和染色质可访问性.
- 对葡萄糖皮质体受体结合的评估.
主要成果:
- 肝细胞特定的NCoR1和NCoR2损失使HDAC3 KO的脂肪肝表型得到了复制.
- 双重KO肝脏显示减少了糖原储存和葡萄糖原基因表达,导致禁食低血糖症.
- 这种代谢功能障碍是HDAC3独立的,并由受损的染色质可访问性导致,防止葡萄糖皮质体受体介导的基因激活.
结论:
- 在新陈代谢调节中,NCoR1和NCoR2具有意想不到的,非正规的激活功能.
- 这一功能对于维持肝脏和全身代谢健康至关重要.
- NCoRs对于调节染色质可访问性至关重要,以控制关键代谢基因的表达.
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