InsP3R-Ca2+ signaling takes center stage in the hormonal regulation of hepatic gluconeogenesis

• 来源期刊: 细胞研究（英文版）
• 年，卷（期）: 2012,（11）
• 页码范围: 1530-1532
• 页数: 3页
• 语种: 英文
• DOI: 10.1038/cr.2012.95

摘要

During fasting,dephosphorylation-dependent activation of the CREB coactivator CRTC2 by glucagon is crucial for activation of the hepatic gluconeogenic program,but the molecular mechanism by which hormones regulate CRTC2 activation remains unclear.A recent report in Nature showed that PKA-dependent phosphorylation of the inositol-1,4,5-trisphosphate receptor (InsP3R) induces Ca2+ mobilization,leading to increase in the phosphatase activity of calcineurin and the subsequent dephosphorylation of CRTC2,thereby resulting in the induction of gluconeogenic gene expression.It also showed that insulin-dependent phosphorylation of InsP3R by Akt inhibits Ca2+ mobilization and CRTC2 dephosphorylation,resulting in the suppression of gluconeogenesis.