Oral bezafibrate induces daily torpor and FGF21 in mice in a PPAR alpha dependent manner

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• 作者：Lisa P. Chu ; Steven J. Swoap ; ^{sswoap@williams.edu}
• 关键词：Core body temperature ; Torpor ; Hibernation ; PPAR伪 ; FGF21
• 刊名：Journal of Thermal Biology
• 出版年：2012
• 期刊代码：100_03064565
• 类别：bio
• 出版时间：July, 2012
• 卷：37
• 期：4
• 页码：291-296
• 文件大小：2411 K

摘要

Fibroblast growth factor 21 (FGF21) is a hormone released from the liver that mediates many of the physiological responses of fasting, such as lipolysis and ketogenesis. FGF21 is induced by the nuclear receptor PPAR伪 when bound to its endogenous agonist, free fatty acid, or to the synthetic agonist, bezafibrate. To determine whether PPAR伪 agonists mediate the metabolic suppression and accompanying fall in body temperature (T_b) in a bout of torpor that occurs in mice in response to fasting, C57Bl/6J mice (wildtype) and PPAR伪 鈭?鈭?mice were implanted with temperature telemeters and fed either a control (CON) diet or one containing a PPAR伪 agonist, bezafibrate (BEZA), for 2 weeks, followed by a fast. Wildtype mice on the BEZA diet had a striking phenotype: most entered spontaneous torpor bouts without caloric restriction towards the end of the 2 weeks. This is the first demonstration that an additive to food could induce spontaneous bouts of daily torpor. However, PPAR伪 鈭?鈭?did not express this phenotype. Moreover, wildtype mice on the BEZA diet had twice the length of torpor bouts in response to a fast as did wildtype mice on the CON diet. PPAR伪 鈭?鈭?mice did enter bouts of fasting-induced torpor, but these were unaffected by the BEZA diet. The BEZA diet induced the level of FGF21 in the blood to fasting levels only in wildtype mice. Collectively, these findings suggest that a BEZA diet mimics the fasted state in both induction of FGF21 and in thermoregulation and does so in a pathway dependent on PPAR伪.