Author:
Sato Takahiro,Oishi Kanae,Koga Daisuke,Ida Takanori,Sakai Yusuke,Kangawa Kenji,Kojima Masayasu
Abstract
AbstractGhrelin, a circulating orexigenic hormone secreted from the stomach, stimulates appetite and food intake by activating the hypothalamic arcuate nucleus. Administration of exogenous ghrelin exerts anabolic effects, causing weight gain, increased adiposity, and decreased metabolism. Body temperature (BT), which is determined by the balance of heat production and heat loss, must be strictly regulated to maintain proper cellular function and metabolism. However, the role of ghrelin in thermoregulation remains unclear. In this study, we found that ghrelin was essential for decreasing BT when mice are placed under calorie restriction. Elevated ghrelin concentrations induced by fasting correlated with significant decreases in BT, a hibernation-like state called torpor. Ghrelin-deficient (Ghrl−/−) animals could not enter torpor. The BT of Ghrl−/− mice also remained high under restricted feeding, but the animals gradually entered precipitous hypothermia, indicating thermoregulatory impairment. These effects of ghrelin on thermoregulation were the result of suppression of sympathetic nervous system activity input to brown adipose tissue; in the absence of ghrelin, it was not possible to suppress uncoupling protein 1 (ucp1) expression and decrease BT in low-energy states. Together, these findings demonstrate that ghrelin is an essential circulating hormone involved in lowering BT.
Funder
a Grant-in-Aid for Young Scientists (B) from JSPS KAKENHI
a Grant-in-Aid for Scientific Research (C) from JSPS KAKENHI
the Kato Memorial Bioscience Foundation
the Foundation for Growth Science
the Ishibashi Foundation for the Promotion of Science
the Takeda Scientific Foundation
the Kobayashi Foundation
the Program for the Promotion of Basic and Applied Research for Innovations in Bio-oriented Industry
a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan
Publisher
Springer Science and Business Media LLC
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献