5 years ago

Lipolysis in Brown Adipocytes Is Not Essential for Cold-Induced Thermogenesis in Mice

Lipolysis in Brown Adipocytes Is Not Essential for Cold-Induced Thermogenesis in Mice
Qiang Cao, Oksana Gavrilova, Liqing Yu, Hyunsu Shin, Yinyan Ma, Dominic Rumore, Anil K.G. Kadegowda, Hang Shi, Rachel Jackson, Bingzhong Xue, Youlin Wang, Tatyana Chanturiya


Lipid droplet (LD) lipolysis in brown adipose tissue (BAT) is generally considered to be required for cold-induced nonshivering thermogenesis. Here, we show that mice lacking BAT Comparative Gene Identification-58 (CGI-58), a lipolytic activator essential for the stimulated LD lipolysis, have normal thermogenic capacity and are not cold sensitive. Relative to littermate controls, these animals had higher body temperatures when they were provided food during cold exposure. The increase in body temperature in the fed, cold-exposed knockout mice was associated with increased energy expenditure and with increased sympathetic innervation and browning of white adipose tissue (WAT). Mice lacking CGI-58 in both BAT and WAT were cold sensitive, but only in the fasted state. Thus, LD lipolysis in BAT is not essential for cold-induced nonshivering thermogenesis in vivo. Rather, CGI-58-dependent LD lipolysis in BAT regulates WAT thermogenesis, and our data uncover an essential role of WAT lipolysis in fueling thermogenesis during fasting.

Publisher URL: http://www.cell.com/cell-metabolism/fulltext/S1550-4131(17)30553-3

DOI: 10.1016/j.cmet.2017.09.002

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