Exercise Helps Build Brown Adipose Tissue in Muscles

Byron's Comments:

A newly discovered mechanism for buidling brown adipose tissue.

Study Title:

A PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis

Study 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.

Study Information:

Pontus Boström, et al. A PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis Nature  2012 January  
Dana-Farber Cancer Institute and Harvard Medical School.

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