The Lin28/let-7 axis regulates glucose metabolism.

The Lin28/let-7 axis regulates glucose metabolism.
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DOI:
10.1016/j.cell.2011.08.033
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发表时间:
2011-09-30
期刊:
影响因子:
64.5
通讯作者:
Daley GQ
Daley GQ
中科院分区:
生物学1区
文献类型:
--
作者:
Zhu H;Shyh-Chang N;Segrè AV;Shinoda G;Shah SP;Einhorn WS;Takeuchi A;Engreitz JM;Hagan JP;Kharas MG;Urbach A;Thornton JE;Triboulet R;Gregory RI;DIAGRAM Consortium;MAGIC Investigators;Altshuler D;Daley GQ

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The let-7 tumor suppressor microRNAs are known for their regulation of oncogenes, while the RNA-binding proteins Lin28a/b promote malignancy by blocking let-7 biogenesis. In studies of the Lin28/let-7 pathway, we discovered unexpected roles in regulating metabolism. When overexpressed in mice, both Lin28a and LIN28B promoted an insulin-sensitized state that resisted high fat diet-induced diabetes, whereas muscle-specific loss of Lin28a and overexpression of let-7 resulted in insulin resistance and impaired glucose tolerance. These phenomena occurred in part through let-7-mediated repression of multiple components of the insulin-PI3K-mTOR pathway, including IGF1R, INSR, and IRS2. The mTOR inhibitor rapamycin abrogated the enhanced glucose uptake and insulin-sensitivity conferred by Lin28a in vitro and in vivo. In addition, we found that let-7 targets were enriched for genes that contain SNPs associated with type 2 diabetes and fasting glucose in human genome-wide association studies. These data establish the Lin28/let-7 pathway as a central regulator of mammalian glucose metabolism.
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