Abstract
The imbalance between energy intake and expenditure is the underlying cause of the current obesity and diabetes pandemics. Central to these pathologies is the fat depot: white adipose tissue (WAT) stores excess calories, and brown adipose tissue (BAT) consumes fuel for thermogenesis using tissue-specific uncoupling protein 1 (UCP1)1,2. BAT was once thought to have a functional role in rodents and human infants only, but it has been recently shown that in response to mild cold exposure, adult human BAT consumes more glucose per gram than any other tissue3. In addition to this nonshivering thermogenesis, human BAT may also combat weight gain by becoming more active in the setting of increased whole-body energy intake4,5,6,7. This phenomenon of BAT-mediated diet-induced thermogenesis has been observed in rodents8 and suggests that activation of human BAT could be used as a safe treatment for obesity and metabolic dysregulation9. In this study, we isolated anatomically defined neck fat from adult human volunteers and compared its gene expression, differentiation capacity and basal oxygen consumption to different mouse adipose depots. Although the properties of human neck fat vary substantially between individuals, some human samples share many similarities with classical, also called constitutive, rodent BAT.
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Acknowledgements
This work was supported by US National Institutes of Health (NIH) grants DK087317, DK081604, DK046200, DK077097 and P30 DK036836 from the National Institute of Diabetes and Digestive and Kidney Diseases KL2 RR025757 and the Clinical Translational Science Award UL1RR025758 to Harvard University and Beth Israel Deaconess Medical Center from the National Center for Research Resources, Harvard Catalyst, The Harvard Clinical and Translational Science Center (NIH award #UL1 RR 025758 and financial contributions from Harvard University and its affiliated academic health care centers), as well as the Harvard Stem Cell Institute and Eli Lilly Foundation. We thank Y.I. Chen and K.K. Kwong for the magnetic resonance imaging; K. Chaudhary for assistance in figure design; M. Mittleman, H. Keenan and E. Wilker for biostatistical advice; J. Skupien for advice on factor analysis; H. Sacks for insights into the role of brown fat in warming blood; C. Cahill at the Joslin Diabetes Center Microscopy Core for expertise in histology; M. Rourk and G. Smyth for assistance in conducting the rodent studies; the teams of operating room nurses for assistance in tissue collection; and C.R. Kahn for input in preparing this manuscript. Finally, we are grateful to our volunteers for their commitment to the studies.
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A.M.C., A.P.W., R.X. and Y.-H.T. designed the experiments. A.M.C., A.P.W., C.V., T.J.S., C.A.S. and Y.-H.T. wrote the manuscript. T.L.H. did immunohistochemistry. A.M.C., A.P.W., R.X., C.A.S., C.R.-T., L.S.W., C.S., A.T.C., L.N.D., L.M.H., N.T., A.L.G., A.R.H., A.G., P.-O.H., M.A.M. and M.M. did the human gene expression profiling. C.A.S., N.T. and M.A.M. did the mouse gene expression profiling. T.J.S. performed brown adipogenesis experiments. C.V. and C.A.S. performed bioenergenics experiments. All authors contributed to editing the manuscript.
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A.M.C. and Y.-H.T. are recipients of a sponsored research grant from Chugai Pharmaceutical Co., Ltd through Joslin Diabetes Center.
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Cypess, A., White, A., Vernochet, C. et al. Anatomical localization, gene expression profiling and functional characterization of adult human neck brown fat. Nat Med 19, 635–639 (2013). https://doi.org/10.1038/nm.3112
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DOI: https://doi.org/10.1038/nm.3112
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