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lüll Targeting Forkhead box O1 from the concept to metabolic diseases: lessons from mouse models Cheng Z; White MFAntioxid Redox Signal 2011[Feb]; 14 (4): 649-61Forkhead box O (FOXO) transcription factors have been implicated in regulating the metabolism, cellular proliferation, stress resistance, apoptosis, and longevity. Through the insulin receptor substrate --> phosphoinositide 3-kinase --> Akt signal cascade, FOXO integrates insulin action with the systemic nutrient and energy homeostasis. Activation of FOXO1 in liver induces gluconeogenesis via phosphoenolpyruvate carboxykinase (PEPCK)/glucose 6-phosphate pathway, and disrupts mitochondrial metabolism and lipid metabolism via heme oxygenase 1/sirtuin 1/Ppargc1alpha pathway. In skeletal muscle, FOXO1 activation underpins the carbohydrate/lipid switch during fasting state. Inhibition of FOXO1 under physiological conditions accounts for maintenance of skeletal muscle mass/function and adipose differentiation. In pancreatic beta-cells, nuclear translocation of FOXO1 antagonizes pancreatic and duodenal homeobox 1 and attenuates beta-cells proliferation and insulin secretion. Regardless, FOXO1 promotes the proliferation of beta-cells through induction of Cyclin D1 in low nutrition, and elicits antioxidant mechanism to protect against beta-cell failure during oxidative insults. In the brain, FOXO1 controls food intake through transcriptional regulation of the orexigenic neuropeptide Y, agouti-related protein, and carboxypeptidase E. In this article, we review the role of FOXO1 in the regulation of metabolism and energy expenditure based on recent findings from mouse models, and discuss the therapeutic value of targeting FOXO1 in metabolic diseases.|Adipose Tissue/metabolism[MESH]|Animals[MESH]|Brain/metabolism[MESH]|Forkhead Transcription Factors/genetics/*metabolism[MESH]|Humans[MESH]|Metabolic Diseases/*metabolism[MESH]|Mice[MESH]|Muscle, Skeletal/metabolism[MESH] |