Dietary menthol-induced TRPM8 activation enhances WAT “browning” and ameliorates diet-induced obesity
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Changyu Jiang1,*, Mingzhu Zhai2,*, Dong Yan1, Da Li3, Chen Li4, Yonghong Zhang4, Lizu Xiao1, Donglin Xiong1, Qiwen Deng5 and Wuping Sun1
1Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, The Affiliated Nanshan People’s Hospital of Shenzhen University, Shenzhen Municipal Sixth People’s Hospital, Shenzhen 518060, China
2Institute of Science and Technology Austria, Am Campus 1, Klosterneuburg 3400, Austria
3Center of Reproductive Medicine, Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang 110004, China
4Laboratory of Medicinal Plant, School of Basic Medicine, Laboratory of Chinese Herbal Pharmacology, Oncology Center, Renmin Hospital and Hubei Key Laboratory of Wudang Local Chinese Medicine Research, Hubei University of Medicine, Hubei 442000, China
5Department of Infectious Diseases and Shenzhen Municipal Key Laboratory for Endogenous Infection, The Affiliated Nanshan People’s Hospital of Shenzhen University, Shenzhen Municipal Sixth People’s Hospital, Shenzhen 518060, China
*These authors have contributed equally to this work
Wuping Sun, email: [email protected]
Keywords: WAT, beige adipocytes, thermogenesis, browning, obesity
Received: January 31, 2017 Accepted: July 29, 2017 Published: August 24, 2017
Beige adipocytes are a new type of recruitable brownish adipocytes, with highly mitochondrial membrane uncoupling protein 1 expression and thermogenesis. Beige adipocytes were found among white adipocytes, especially in subcutaneous white adipose tissue (sWAT). Therefore, beige adipocytes may be involved in the regulation of energy metabolism and fat deposition. Transient receptor potential melastatin 8 (TRPM8), a Ca2+-permeable non-selective cation channel, plays vital roles in the regulation of various cellular functions. It has been reported that TRPM8 activation enhanced the thermogenic function of brown adiposytes. However, the involvement of TRPM8 in the thermogenic function of WAT remains unexplored. Our data revealed that TRPM8 was expressed in mouse white adipocytes at mRNA, protein and functional levels. The mRNA expression of Trpm8 was significantly increased in the differentiated white adipocytes than pre-adipocytes. Moreover, activation of TRPM8 by menthol enhanced the expression of thermogenic genes in cultured white aidpocytes. And menthol-induced increases of the thermogenic genes in white adipocytes was inhibited by either KT5720 (a protein kinase A inhibitor) or BAPTA-AM. In addition, high fat diet (HFD)-induced obesity in mice was significantly recovered by co-treatment with menthol. Dietary menthol enhanced WAT “browning” and improved glucose metabolism in HFD-induced obesity mice as well. Therefore, we concluded that TRPM8 might be involved in WAT “browning” by increasing the expression levels of genes related to thermogenesis and energy metabolism. And dietary menthol could be a novel approach for combating human obesity and related metabolic diseases.
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