Upstream stimulating factor 1 suppresses autophagy and hepatic lipid droplet catabolism by activating mTOR.

Upstream stimulating factor 1 suppresses autophagy and hepatic lipid droplet catabolism by activating mTOR.
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上游刺激因子 1 通过激活 mTOR 抑制自噬和肝脂滴分解代谢

DOI:
10.1002/1873-3468.13203
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发表时间:
2018-08
期刊:
影响因子:
3.5
通讯作者:
Li J
Li J
中科院分区:
生物学3区
文献类型:
--
作者:
Guo J;Fang W;Chen X;Lin Y;Hu G;Wei J;Zhang X;Yang C;Li J

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以往的研究表明,转录因子上游刺激因子1(USF 1)参与调节脂质和葡萄糖代谢。然而,USF 1在脂质诱导的自噬中的作用仍然未知。有趣的是,我们发现USF 1过表达抑制HepG 2细胞中自噬相关基因的表达。进一步的分析证实,USF 1可以转录激活mTOR表达,从而抑制HepG 2细胞中雷帕霉素诱导的自噬。此外,用雷帕霉素的自噬的药理学激活降低了暴露于油酸酯/棕榈酸酯混合物的HepG 2细胞中脂滴(LD)的数量和大小。值得注意的是,USF 1上调减少了LD和自噬体的共定位。总之,我们的数据提供的证据表明,USF 1通过调节mTOR转录抑制自噬,导致肝脏中脂质异常积聚。
Previous studies indicate that the transcription factor upstream stimulating factor 1 (USF1) is involved in the regulation of lipid and glucose metabolism. However, the role of USF1 in lipid‐induced autophagy remains unknown. Interestingly, we found that USF1 overexpression suppresses autophagy‐related gene expression in HepG2 cells. Further assays confirmed that USF1 could transcriptionally activate mTOR expression, thereby suppressing rapamycin‐induced autophagy in HepG2 cells. Moreover, pharmacological activation of autophagy with rapamycin decreases the numbers and sizes of lipid droplets (LDs) in HepG2 cells exposed to an oleate/palmitate mixture. Of note, USF1 upregulation decreases colocalization of LDs and autophagosomes. In conclusion, our data provide evidence that USF1 contributes to abnormal lipid accumulation in the liver by suppressing autophagy via regulation of mTOR transcription.
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