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PER2 promotes glucose storage to hepatic glycogen during fasting and refeeding by inducing. Gys-2, PTG, and GL. expression

Journal article
Authors Fabio Zani
Ludovic Breasson
Barbara Becattini
Jean-Pierre Montani
Alessandro Provenzani
Urs Albrecht
Juergen Ripperger
Giovanni Solinas
Published in Molecular Metabolism
Issue July 2013
Pages 292-395
Publication year 2013
Published at
Pages 292-395
Language en
Keywords Metabolism, Glucose, glycogen, circadian rhythms
Subject categories Basic Medicine

Abstract

The interplay between hepatic glycogen metabolism and blood glucose levels is a paradigm of the rhythmic nature of metabolic homeostasis. Here we show that mice lacking a functional PER2 protein (Per2Brdm1) display reduced fasting glycemia, altered rhythms of hepatic glycogen accumulation, and altered rhythms of food intake. Per2Brdm1 mice show reduced hepatic glycogen content and altered circadian expression during controlled fasting and refeeding. Livers from Per2Brdm1 mice display reduced glycogen synthase protein levels during refeeding, and increased glycogen phosphorylase activity during fasting. The latter is explained by PER2 action on the expression of the adapter proteins PTG and GL, which target the protein phosphatase-1 to glycogen to decrease glycogen phosphorylase activity. Finally, PER2 interacts with genomic regions of Gys2, PTG, and GL. These results indicate an important role for PER2 in the hepatic transcriptional response to feeding and acute fasting that promotes glucose storage to liver glycogen.

Page Manager: Webmaster|Last update: 9/11/2012
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