Abstract
Exercise benefits a variety of organ systems in mammals, and some of the best-recognized effects of exercise on muscle are mediated by the transcriptional co-activator PPAR-γ co-activator-1 α (PGC1-α). Here we show in mouse that PGC1-α expression in muscle stimulates an increase in expression of FNDC5, a membrane protein that is cleaved and secreted as a newly identified hormone, irisin. Irisin acts on white adipose cells in culture and in vivo to stimulate UCP1 expression and a broad program of brown-fat-like development. Irisin is induced with exercise in mice and humans, and mildly increased irisin levels in the blood cause an increase in energy expenditure in mice with no changes in movement or food intake. This results in improvements in obesity and glucose homeostasis. Irisin could be therapeutic for human metabolic disease and other disorders that are improved with exercise.
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Acknowledgements
This study was supported by National Institutes of Health grants DK54477, DK31405, DK61562 to B.M.S. P.B. and E.A.B. were supported by the Wenner-Gren Foundation, Swedish Heart and Lung Foundation and the ‘Svenska Sällskapet för Medicinsk Forskning’. J.W. was supported by a postdoctoral fellowship from the American Heart Association (Founders Affiliate #09POST2010078). The animal procedures were in accordance with Institutional Animal Use and Care Committee protocols 110-2008 and 056-2009. The authors thank S. Loffredo and M. Kirschner for discussions and suggestions on the manuscript.
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P.B. and B.M.S. planned the majority of experiments and wrote the paper, and P.B. executed most of the experiments. J.W. performed a subset of cultured cell experiments and contributed valuable materials. M.P.J. and S.P.G. performed the peptide fingerprinting identification of irisin cleavage. A.K. contributed with technical assistance and L.Y. and S.K. performed the CLARK electrode experiments. E.A.B. assisted with the hydrodynamic injections. J.C.L. assisted with intravenous injections and K.A.R. with bioinformatics. J.Z.L. and J.H.C. performed in vitro experiments. P.B. and H.T. and LakePharma designed and provided Fc fusion proteins. K.H. and B.F.V. performed the human cohort study, and M.C.Z. and S.C. performed the electron microscopy studies.
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Boström, P., Wu, J., Jedrychowski, M. et al. A PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis. Nature 481, 463–468 (2012). https://doi.org/10.1038/nature10777
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DOI: https://doi.org/10.1038/nature10777
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