title: FoxO1 stimulates fatty acid uptake and oxidation in muscle cells through CD36-dependent and -independent mechanisms.
abstract: Emerging evidence documents a key function for the forkhead transcription factor FoxO1 in cellular metabolism. Here, we investigate the role of FoxO1 in the regulation of fatty acid (FA) metabolism in muscle cells. C2C12 cells expressing an inducible construct with either wild type FoxO1 or a mutant form (FoxO1/TSS) refractory to the protein kinase B inhibitory effects were generated. FoxO1 activation after myotube formation altered the expression of several genes of FA metabolism. Acyl-CoA oxidase and peroxisome proliferator-activated receptor delta mRNA levels increased 2.2-fold and 1.4-fold, respectively, whereas mRNA for acetyl-CoA carboxylase decreased by 50%. Membrane uptake of oleate increased 3-fold, and oleate oxidation increased 2-fold. Cellular triglyceride content was also increased. The enhanced FA utilization induced by FoxO1 was mediated by a severalfold increase in plasma membrane level of the fatty acid translocase FAT/CD36 and eliminated by cell treatment with the CD36 inhibitor sulfo-N-succinimidyl-oleate. We conclude that FoxO1 activation induces coordinate increases in FA uptake and oxidation and that these effects are mediated, at least in part, by membrane enrichment in CD36. The data suggest that FoxO1 contributes to preparing the muscle cell for the increased reliance on FA metabolism that is characteristic of fasting. Dysregulation of FoxO1 in muscle could contribute to intramuscular lipid accumulation and insulin resistance by maintaining activation of FA uptake.
authors.affiliation: Department of Physiology and Biophysics, State University of New York at Stony Brook, Stony Brook, New York 11794-8661, USA.
authors.forename: Claire C
authors.initials: CC
authors.lastname: Bastie
authors.forename: Zaher
authors.initials: Z
authors.lastname: Nahlé
authors.forename: Thomas
authors.initials: T
authors.lastname: McLoughlin
authors.forename: Karyn
authors.initials: K
authors.lastname: Esser
authors.forename: Wenwei
authors.initials: W
authors.lastname: Zhang
authors.forename: Terry
authors.initials: T
authors.lastname: Unterman
authors.forename: Nada A
authors.initials: NA
authors.lastname: Abumrad
mesh_terms: D000818:Animals; D001692:Biological Transport / Q000502:physiology; D018955:CD36 Antigens / Q000378:metabolism*; D031204:Caloric Restriction; D002460:Cell Line; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism*; D000071161:Forkhead Box Protein O1; D051858:Forkhead Transcription Factors; D005786:Gene Expression Regulation; D005947:Glucose / Q000378:metabolism; D051379:Mice; D032446:Myoblasts / Q000166:cytology / Q000378:metabolism*; D010084:Oxidation-Reduction; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014280:Triglycerides / Q000378:metabolism
chemical_list: D018955:CD36 Antigens; D005227:Fatty Acids; D000071161:Forkhead Box Protein O1; D051858:Forkhead Transcription Factors; C467200:Foxo1 protein, mouse; D011960:Receptors, Estrogen; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D014280:Triglycerides; D005947:Glucose