Cyclin D1-Cdk4 controls glucose metabolism independently of cell cycle progression.

Cyclin D1-Cdk4 controls glucose metabolism independently of cell cycle progression.
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DOI:
10.1038/nature13267
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发表时间:
2014-06-26
期刊:
影响因子:
64.8
通讯作者:
Puigserver, Pere
Puigserver, Pere
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lee, Yoonjin;Dominy, John E.;Choi, Yoon Jong;Jurczak, Michael;Tolliday, Nicola;Camporez, Joao Paulo;Chim, Helen;Lim, Ji-Hong;Ruan, Hai-Bin;Yang, Xiaoyong;Vazquez, Francisca;Sicinski, Piotr;Shulman, Gerald I.;Puigserver, Pere

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Insulin constitutes a major evolutionarily conserved hormonal axis for maintaining glucose homeostasis; dysregulation of this axis causes diabetes. PGC-1α links insulin signaling to the expression of glucose and lipid metabolic genes. GCN5 acetylates PGC-1α and suppresses its transcriptional activity, whereas SIRT1 deacetylates and activates PGC-1α. Although insulin is a mitogenic signal in proliferative cells, whether components of the cell cycle machinery contribute to insulin’s metabolic action is poorly understood. Herein, we report that insulin activates cyclin D1-CDK4, which, in turn, increases GCN5 acetyltransferase activity and suppresses hepatic glucose production independently of cell cycle progression. Through a cell-based high throughput chemical screen, we identified a CDK4 inhibitor that potently decreases PGC-1α acetylation. Insulin/GSK3β signaling induces cyclin D1 protein stability via sequestering cyclin D1 in the nucleus. In parallel, dietary amino acids increase hepatic cyclin D1 mRNA transcripts. Activated cyclin D1-CDK4 kinase phosphorylates and activates GCN5, which then acetylates and inhibits PGC-1α activity on gluconeogenic genes. Loss of hepatic cyclin D1 results in increased gluconeogenesis and hyperglycemia. In diabetic models, cyclin D1-CDK4 is chronically elevated and refractory to fasting/feeding transitions; nevertheless further activation of this kinase normalizes glycemia. Our findings show that insulin uses components of the cell cycle machinery in post-mitotic cells to control glucose homeostasis independently of cell division.
在条件X-box结合蛋白-1(XBP1)敲除小鼠中,从肝胰岛素抵抗中从肝胰岛素抵抗中解离肌醇提取酶(IRE1α)介导的C-JUN N末端激酶激活。
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