title: Fatty acid-binding protein 3 stimulates glucose uptake by facilitating AS160 phosphorylation in mouse muscle cells.
abstract: We studied the relationship between fatty acid-binding protein 3 (FABP3) and obesity in vivo and the effects of FABP3 on signal transduction for glucose uptake in skeletal muscle cells in vitro. In obese mice, the level of FABP3 protein in gastrocnemius muscles increased significantly with an increase in body weight and metabolic phenotypes, suggesting a close relationship between FABP3 expression in the muscle and the development of obesity and/or insulin resistance in mice. In experiments using C2C12 myotubes infected with adenoviruses encoding human FABP3, induction stimulated glucose uptake without insulin stimulation in parallel with increases in the phosphorylation of AMP-activated protein kinase (AMPK) and AS160. Insulin enhanced glucose uptake in an additive fashion with increased phosphorylation of Akt and AS160 in FABP3-induced myotubes compared to control cells. This increased glucose uptake in FABP3-induced myotubes with insulin stimulation was found even in the presence of palmitate, in which a significantly higher Akt phosphorylation was detected compared to controls. These results suggest that FABP3 stimulates glucose uptake by facilitating AMPK-dependent AS160 phosphorylation in skeletal muscle. FABP3 may also contribute to AS160 phosphorylation by maintaining insulin-dependent Akt activation in the cells under a lipotoxic condition.
authors.affiliation: Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai 487-8501, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kusudo
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Kontani
authors.forename: Naoya
authors.initials: N
authors.lastname: Kataoka
authors.forename: Fujiko
authors.initials: F
authors.lastname: Ando
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimokata
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Yamashita
mesh_terms: D000818:Animals; D000074026:Fatty Acid Binding Protein 3; D050556:Fatty Acid-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D020690:GTPase-Activating Proteins / Q000378:metabolism*; D005786:Gene Expression Regulation; D056726:Genetic Association Studies; D005947:Glucose / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018485:Muscle Fibers, Skeletal / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism*; D009765:Obesity / Q000235:genetics; D010168:Palmitates / Q000494:pharmacology; D010641:Phenotype; D010766:Phosphorylation; D015398:Signal Transduction; D014158:Transcription, Genetic
chemical_list: C493409:Fabp3 protein, mouse; D000074026:Fatty Acid Binding Protein 3; D050556:Fatty Acid-Binding Proteins; D020690:GTPase-Activating Proteins; D010168:Palmitates; C505647:Tbc1d4 protein, mouse; D005947:Glucose