AUTOPHAGY:调节MTORC1-TFEB反馈信号改善肝脏脂肪变性和肝损伤

2018-07-28 海北 MedSci原创

最近,研究人员发现,在摄入高脂肪饮食(HFD)后,小鼠肝脏合成代谢,以RPS6KB(核糖体蛋白S6激酶)的磷酸化为代表,很快升高,而分解代谢作用,如TFEB(转录因子EB)指导的基因转录和溶酶体活性所代表的,有所下调。

正常的新陈代谢需要合成代谢和分解代谢之间的可控平衡。当营养供应水平长期变化时,如何保持这种平衡尚不完全清楚。
最近,研究人员发现,在摄入高脂肪饮食(HFD)后,小鼠肝脏合成代谢,以RPS6KB(核糖体蛋白S6激酶)的磷酸化为代表,很快升高,而分解代谢作用,如TFEB(转录因子EB)指导的基因转录和溶酶体活性所代表的,有所下调。
令人惊讶的是,在长期的HFD喂养过程中,RPS6KB磷酸化的改变和TFEB功能的改变都不是静态的。相反,2个信号表现出相反方向的动态改变,这可以通过TFEB支持的溶酶体功能依赖性的MTORC1(MTOR复合物1)激活,以及MTORC1对TFEB的反馈抑制来解释。
在MTORC1高度活化时,通过在HFD喂养的小鼠中强制表达TFEB可以恢复溶酶体功能。一致地,雷帕霉素对MTORC1的抑制也增强了溶酶体功能,组成型活化的RRAGA突变体降低了溶酶体功能。这些治疗也分别改善或加剧了肝脏脂肪变性和肝损伤。
最后,在非酒精性脂肪性肝病患者的肝脏中,TFEB活化与脂肪变性严重程度之间存在显着的负相关,支持了TFEB调节事件的临床相关性。
因此,在营养过剩导致的增强的合成代谢期间,通过反馈机制维持分解代谢功能对于减少肝脏病理学是重要的。

原始出处:
Hao Zhang et al. Dynamic MTORC1-TFEB feedback signaling regulates hepatic autophagy, steatosis and liver injury in long-term nutrient oversupply. AUTOPHAGY 2018, DOI: https://doi.org/10.1080/15548627.2018.1490850

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    2018-08-04 liumin1987

    肝脏疾病中的信号通路。

    0

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    2018-07-29 huangdf
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    2018-07-28 sunfeifeiyang

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