Regulation of systemic energy homeostasis by serotonin in adipose tissues

Chang-Myung Oh, Jun Namkung, Younghoon Go, Ko Eun Shong, Kyuho Kim, Hyeongseok Kim, Bo-Yoon Park, Ho Won Lee, Yong Hyun Jeon, Junghan Song, Minho Shong, Vijay K. Yadav, Gerard Karsenty, Shingo Kajimura, In-Kyu Lee, Sangkyu Park, and Hail Kim
Nature Communications
Publication Date: 
Mon, 2015-04-13
Central serotonin (5-HT) is an anorexigenic neurotransmitter in the brain. However, accumulating evidence suggests peripheral 5-HT may affect organismal energy homeostasis. Here we show 5-HT regulates white and brown adipose tissue function. Pharmacological inhibition of 5-HT synthesis leads to inhibition of lipogenesis in epididymal white adipose tissue (WAT), induction of browning in inguinal WAT and activation of adaptive thermogenesis in brown adipose tissue (BAT). Mice with inducible Tph1 KO in adipose tissues exhibit a similar phenotype as mice in which 5-HT synthesis is inhibited pharmacologically, suggesting 5-HT has localized effects on adipose tissues. In addition, Htr3a KO mice exhibit increased energy expenditure and reduced weight gain when fed a high-fat diet. Treatment with an Htr2a antagonist reduces lipid accumulation in 3T3-L1 adipocytes. These data suggest important roles for adipocyte-derived 5-HT in controlling energy homeostasis.
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