DDB1 准备棕色脂肪细胞进行冷诱导的热生成
Xu Wang1,2, Shen-Ying Liu1, Guo-Sheng Hu3
1State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Metabolic Remodeling and Health, Institute of Metabolism and Integrative Biology, Zhongshan Hospital, Fudan University, Shanghai, China.
Life metabolism
|January 28, 2025
概括
损伤特异性DNA结合蛋白1 (DDB1) 对于在暴露于寒冷期间在棕色脂肪组织 (BAT) 中快速激活发热基因至关重要. DDB1准备了用于快速基因转录的BAT,这对热生成至关重要.
科学领域:
- 代谢和内分泌学
- 分子生物学分子生物学
- 脂肪组织生物学 脂肪组织生物学
背景情况:
- 棕色脂肪组织 (BAT) 对热生成至关重要,特别是在寒冷压力期间.
- 准备用于快速热生成基因激活的BAT的精确机制仍然不完全理解.
研究的目的:
- 阐明损伤特异性DNA结合蛋白1 (DDB1) 在BAT对急性寒冷暴露的快速转录反应中的作用.
- 研究DDB1调节发热基因表达的分子机制.
主要方法:
- 产生和分析脂肪或BAT特定的DDB1淘汰小鼠.
- 评估BAT形态,基因表达 (包括Ucp1和Ppargc1a) 和对冷暴露 (4°C) 的反应.
- 研究DDB1与基因促进体和转录机制的相互作用 (P-TEFb,Pol II).
主要成果:
- 特定于BAT的DDB1缺陷导致了白色的BAT,降低了发热基因表达,在寒冷条件下出现了低温.
- 在高脂肪饮食中,DDB1淘汰赛小鼠表现出部分脂质变和脂肪酸氧化受损.
- 发现DDB1结合Ucp1和Ppargc1a促进体,招募P-TEFb以促进RNA聚合酶II释放和基因转录.
结论:
- DDB1是冷挑战时在BAT中快速发热基因转录的关键媒介.
- DDB1通过调节关键的热生成基因,在为急性寒冷暴露准备BAT方面发挥着至关重要的作用.
- 这些发现揭示了一个新的监管机制,这对于BAT对寒冷的适应性反应至关重要.
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