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
中科院分区:
文献类型:
--
作者:
Guo J;Fang W;Chen X;Lin Y;Hu G;Wei J;Zhang X;Yang C;Li J
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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影响因子:
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作者:
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通讯作者:
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DOI:
10.1016/j.jcmgh.2016.10.002
发表时间:
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期刊:
Molecules (Basel, Switzerland)
影响因子:
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