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mTOR复合体1调节lipin1的局部化,以控制SREBP通路
Timothy R Peterson1, Shomit S Sengupta, Thurl E Harris
1Whitehead Institute for Biomedical Research, Koch Center for Integrative Cancer Research at MIT, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
Cell
|August 6, 2011
概括
营养激酶mTOR复合体1 (mTORC1) 通过调节蛋白1核进入来控制生长. 这种机制影响SREBP的活动,影响小鼠的基因转录和代谢性疾病耐药性.
科学领域:
- 细胞生物学 细胞生物学
- 代谢过程中的代谢.
- 分子生物学分子生物学
背景情况:
- 拉巴胺素复合体1 (mTORC1) 的机械标是细胞生长和新陈代谢的关键调节者.
- 固醇调节元素结合蛋白 (SREBPs) 是脂质和胆固醇合成的关键转录因子.
- 通过mTORC1影响SREBP活动的精确机制仍然不完全理解.
研究的目的:
- 阐明将mTORC1信号与SREBP功能联系起来的分子机制.
- 调查 lipin 1 在调节 mTORC1 依赖的脂质生成和胆固醇生成中的作用.
- 为了确定mTORC1-lipin 1-SREBP途径在饮食诱导的代谢障碍中的体内相关性.
主要方法:
- 利用生物化学分析来评估蛋白质相互作用和酶活性.
- 采用基于细胞的测试来监测SREBP基因表达和促进体活性.
- 在实体研究中,使用具有肝脏特异性mTORC1抑制和高脂肪/胆固醇饮食的小鼠模型进行了实验.
主要成果:
- 证明mTORC1控制了蛋白1的核转位,一种酸酸酶.
- 证明了去酸化的核脂蛋白1对于调解mTORC1对SREBP活性和基因表达的影响至关重要.
- 发现抑制肝脏mTORC1会对饮食诱导的肝脏肥胖症和高胆固醇血症产生抗性,依赖于lipin 1.
结论:
- 已经确立了lipin 1作为mTORC1-SREBP信号轴中的关键调解器.
- 确定了lipin 1的核入口作为mTORC1.1控制的关键监管步骤.
- 突出了针对代谢疾病mTORC1-lipin 1途径的治疗潜力.
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