Abstract：
:Insulin rapidly suppresses hepatic glucose production and slowly decreases expression of genes encoding gluconeogenic proteins. In this study, we show that an immediate effect of insulin is to redirect newly synthesized glucose-6-phosphate to glycogen without changing the rate of gluconeogenesis. This process requires hepatic Akt2, as revealed by blunted insulin-mediated suppression of glycogenolysis in the perfused mouse liver, elevated hepatic glucose production during a euglycemic-hyperinsulinemic clamp, or diminished glycogen accumulation during clamp or refeeding in mice without hepatic Akt2. Surprisingly, the absence of Akt2 disrupted glycogen metabolism independent of GSK3α and GSK3β phosphorylation, which is thought to be an essential step in the pathway by which insulin regulates glycogen synthesis through Akt. These data show that (1) the immediate action of insulin to suppress hepatic glucose production functions via an Akt2-dependent redirection of glucose-6-phosphate to glycogen, and (2) insulin increases glucose phosphorylation and conversion to glycogen independent of GSK3.
journal_name
Cell Metabjournal_title
Cell metabolismauthors
Wan M,Leavens KF,Hunter RW,Koren S,von Wilamowitz-Moellendorff A,Lu M,Satapati S,Chu Q,Sakamoto K,Burgess SC,Birnbaum MJdoi
10.1016/j.cmet.2013.06.001subject
Has Abstractpub_date
2013-07-02 00:00:00pages
99-105issue
1eissn
1550-4131issn
1932-7420pii
S1550-4131(13)00244-1journal_volume
18pub_type
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