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pubmed-article:10484368pubmed:abstractTextThe effect of moderate hyperleptinemia ( approximately 20 ng/ml) on liver and skeletal muscle glycogen metabolism was examined in Wistar rats. Animals were studied approximately 90 h after receiving recombinant adenoviruses encoding rat leptin (AdCMV-leptin) or beta-galactosidase (AdCMV-betaGal). Liver and skeletal muscle glycogen levels in the fed and fasted (18 h) states were similar in AdCMV-leptin- and AdCMV-betaGal-treated rats. However, after delivery of a glucose bolus, liver glycogen levels were significantly greater in AdCMV-leptin compared with AdCMV-betaGal rats (P < 0.05). To investigate the mechanism(s) of these differences, glycogen levels were measured immediately after the cessation of a 3- or 6-h glucose infusion or 3, 6, and 9 h after the cessation of a 6-h glucose infusion. Similar increases in liver and skeletal muscle glycogen occurred in hyperleptinemic and control rats in response to glucose infusions. However, 3 and 6 h after the cessation of a glucose infusion, liver glycogen levels were approximately twofold greater (P < 0.05) in AdCMV-leptin-treated compared with AdCMV-betaGal-treated animals. Skeletal muscle glycogen levels were similar in AdCMV-leptin-treated and AdCMV-betaGal-treated animals at the same time points. Glycogen phosphorylase, phosphodiesterase 3B, and glycogen synthase activities were unaltered by hyperleptinemia. We conclude that moderate increases in plasma leptin levels decrease liver glycogen degradation during the fed-to-fasted transition.lld:pubmed
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pubmed-article:10484368pubmed:authorpubmed-author:ZhaoA ZAZlld:pubmed
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pubmed-article:10484368pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:10484368pubmed:articleTitleSparing effect of leptin on liver glycogen stores in rats during the fed-to-fasted transition.lld:pubmed
pubmed-article:10484368pubmed:affiliationGifford Laboratories for Diabetes Research and Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA. Odohertyr@msx.dept-med.Pitt.edulld:pubmed
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