Journal
CELL METABOLISM
Volume 13, Issue 1, Pages 68-79Publisher
CELL PRESS
DOI: 10.1016/j.cmet.2010.12.005
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Funding
- Division of Signal Transduction Therapy
- NIH [NIH U24 DK059637, NIH R01 DK54902]
- MRC [MC_U127088492, MC_U127084354] Funding Source: UKRI
- Diabetes UK [07/0003529] Funding Source: researchfish
- Medical Research Council [MC_U127088492, MC_U127084354] Funding Source: researchfish
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AS160 has emerged as a key player in insulin-mediated glucose transport through controlling GLUT4 trafficking, which is thought to be regulated by insulin-stimulated phosphorylation of sites including the 14-3-3 binding phospho-Thr649 (equivalent to Thr642 in human AS160). To define physiological roles of AS160-Thr649 phosphorylation and 14-3-3 binding in glucose homeostasis, we substituted this residue by a nonphosphorylatable alanine by knockin mutation in mice. The mutant protein was expressed at normal levels, while insulin-stimulated AS160 binding to 14-3-3s was abolished in homozygous knockin mice. These animals displayed impaired glucose disposal and insulin sensitivity, which were associated with decreased glucose uptake in vivo. Insulin-stimulated glucose transport and cell surface GLUT4 content were reduced in isolated muscles, but not in adipocytes. These results provide genetic evidence that insulin-induced AS160-Thr649 phosphorylation and/or its binding to 14-3-3 play an important role in regulating whole-body glucose homeostasis, at least in part through regulating GLUT4 trafficking in muscle.
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