Abstract | OBJECTIVE:
Glucose homeostasis is achieved by triggering regulation of glycogen synthesis genes in response to insulin when mammals feed, but the underlying molecular mechanism remains largely unknown. The aim of our study was to examine the role of the signal transducers and activators of transcription 3 (STAT3) in insulin signaling. RESEARCH DESIGN AND METHODS: We generated a strain of mice carrying a targeted disruption of Stat3 gene in the liver (L-Stat3(-/-) mice). Hepatocytes of the L-Stat3(-/-) mice were isolated to establish cell lines for mechanistic studies. Nuclear translocation and DNA- protein interaction of STAT3 was analyzed with immunofluorescent and chromatin immunoprecipitation methods, respectively. Levels of glucose, insulin, leptin, and glucagon were profiled, and putative downstream molecules of STAT3 were examined in the presence of various stimuli in L-Stat3(-/-) and control mice. RESULTS: CONCLUSIONS: These data indicate that STAT3 sensitizes insulin signaling by negatively regulating GSK-3beta. Inactivation of STAT3 in the liver contributes significantly to the pathogenesis of insulin resistance.
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Authors | Akira Moh, Wenjun Zhang, Sidney Yu, Jun Wang, Xuming Xu, Jiliang Li, Xin-Yuan Fu |
Journal | Diabetes
(Diabetes)
Vol. 57
Issue 5
Pg. 1227-35
(May 2008)
ISSN: 1939-327X [Electronic] United States |
PMID | 18268048
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Chemical References |
- Chromatin
- Insulin
- Prealbumin
- STAT3 Transcription Factor
- Stat3 protein, mouse
- Glycogen Synthase Kinase 3 beta
- Gsk3b protein, mouse
- Glycogen Synthase Kinase 3
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Topics |
- Animals
- Cell Culture Techniques
- Chromatin
(genetics, physiology)
- Gene Expression Regulation, Enzymologic
- Genotype
- Glycogen Synthase Kinase 3
(genetics)
- Glycogen Synthase Kinase 3 beta
- Hepatocytes
(cytology, drug effects, physiology)
- Insulin
(pharmacology, physiology)
- Mice
- Mice, Knockout
- Mice, Transgenic
- Prealbumin
(genetics)
- STAT3 Transcription Factor
(deficiency, genetics, physiology)
- Signal Transduction
(genetics, physiology)
- Transfection
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