title: Role of forkhead box protein A3 in age-associated metabolic decline.
abstract: Aging is associated with increased adiposity and diminished thermogenesis, but the critical transcription factors influencing these metabolic changes late in life are poorly understood. We recently demonstrated that the winged helix factor forkhead box protein A3 (Foxa3) regulates the expansion of visceral adipose tissue in high-fat diet regimens; however, whether Foxa3 also contributes to the increase in adiposity and the decrease in brown fat activity observed during the normal aging process is currently unknown. Here we report that during aging, levels of Foxa3 are significantly and selectively up-regulated in brown and inguinal white fat depots, and that midage Foxa3-null mice have increased white fat browning and thermogenic capacity, decreased adipose tissue expansion, improved insulin sensitivity, and increased longevity. Foxa3 gain-of-function and loss-of-function studies in inguinal adipose depots demonstrated a cell-autonomous function for Foxa3 in white fat tissue browning. Furthermore, our analysis revealed that the mechanisms of Foxa3 modulation of brown fat gene programs involve the suppression of peroxisome proliferator activated receptor γ coactivtor 1 α (PGC1α) levels through interference with cAMP responsive element binding protein 1-mediated transcriptional regulation of the PGC1α promoter. Overall, our data demonstrate a role for Foxa3 in energy expenditure and in age-associated metabolic disorders.
authors.affiliation: Genetic of Development and Disease Branch and.
authors.forename: Xinran
authors.initials: X
authors.lastname: Ma
authors.affiliation: Genetic of Development and Disease Branch and.
authors.forename: Lingyan
authors.initials: L
authors.lastname: Xu
authors.affiliation: Mouse Metabolism Core, National Institute of Diabetes and Digestive and Kidney Disease, National Institutes of Health, Bethesda, MD 20892.
authors.forename: Oksana
authors.initials: O
authors.lastname: Gavrilova
authors.affiliation: Genetic of Development and Disease Branch and elisabettam@niddk.nih.gov.
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Mueller
mesh_terms: D002001:Adipose Tissue, Brown / Q000378:metabolism; D052436:Adipose Tissue, White / Q000378:metabolism; D050154:Adiposity / Q000235:genetics / Q000502:physiology; D000375:Aging / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D004734:Energy Metabolism / Q000235:genetics / Q000502:physiology; D051543:Hepatocyte Nuclear Factor 3-gamma / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D007333:Insulin Resistance / Q000235:genetics / Q000502:physiology; D008136:Longevity / Q000235:genetics / Q000502:physiology; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009765:Obesity / Q000235:genetics / Q000378:metabolism; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D022722:Thermogenesis / Q000235:genetics / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation
chemical_list: C492004:Creb1 protein, mouse; D017362:Cyclic AMP Response Element-Binding Protein; C496506:Foxa3 protein, mouse; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; C485290:Ppargc1a protein, mouse; D012333:RNA, Messenger; D014157:Transcription Factors; D051543:Hepatocyte Nuclear Factor 3-gamma
keywords: diabetes; obesity