Neurotensin-neurotensin receptor 2 signaling in adipocytes suppresses food intake through regulating ceramide metabolism

脂肪细胞中的神经降压素-神经降压素受体 2 信号通过调节神经酰胺代谢来抑制食物摄入

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作者:Wei Fu, Yuanting Lai, Kexin Li, Yue Yang, Xiao Guo, Qifan Gong, Xiaofeng Zhou, Liying Zhou, Cenxi Liu, Zhi Zhang, Jisun So, Yufeng Zhang, Lin Huang, Guangxing Lu, Chuanyou Yi, Qichu Wang, Chenyu Fan, Chao Liu, Jiaxing Wang, Haiyi Yu, Yimin Zhao, Tao Huang, Hyun Cheol Roh, Tiemin Liu, Huiru Tang, Jia

Abstract

Neurotensin (NTS) is a secretory peptide produced by lymphatic endothelial cells. Our previous study revealed that NTS suppressed the activity of brown adipose tissue via interactions with NTSR2. In the current study, we found that the depletion of Ntsr2 in white adipocytes upregulated food intake, while the local treatment of NTS suppressed food intake. Our mechanistic study revealed that suppression of NTS-NTSR2 signaling enhanced the phosphorylation of ceramide synthetase 2, increased the abundance of its products ceramides C20-C24, and downregulated the production of GDF15 in white adipose tissues, which was responsible for the elevation of food intake. We discovered a potential causal and positive correlation between serum C20-C24 ceramide levels and human food intake in four populations with different ages and ethnic backgrounds. Together, our study shows that NTS-NTSR2 signaling in white adipocytes can regulate food intake via its direct control of lipid metabolism and production of GDF15. The ceramides C20-C24 are key factors regulating food intake in mammals.

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