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Effects of photoperiod history on body mass and energy metabolism in Brandt's voles (Lasiopodomys brandtii)

机译:光周期史对勃氏田鼠体重和能量代谢的影响(Lasiopodomys brandtii)

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摘要

Many small mammals respond to seasonal changes in photoperiod via alterations in morphology, physiology and behaviour. In the present study, we tested the hypothesis that the preweaning (from embryo to weaning) photoperiod experience can affect subsequent development in terms of body mass and thermogenesis. Brandt's voles (Lasiopodomys brandtii) were gestated and reared to weaning under either a short (SD, 8 h: 16 h L:D) or a long photoperiod (LD, 16 h: 8 h L:D) at a constant ambient temperature (23 degrees C). At weaning, male juveniles were either maintained in their initial photoperiod or transferred to the alternative photoperiod for 8 weeks. Postweaning SD voles had a lower body mass but higher thermogenic capacity compared with LD voles. At the same time, preweaning photoperiod conditions had long-lasting effects on thermogenic capacity later in life. Serum leptin concentration was positively correlated with body mass and body fat mass, whereas it was negatively correlated with energy intake and uncoupling protein 1 content in brown adipose tissue. Our results suggest that postweaning development in terms of body mass and thermogenesis is predominantly influenced by the postweaning photoperiod, while the preweaning photoperiod experience could chronically modify thermogenesis but not body mass. Furthermore, serum leptin, acting as a potential adipostatic signal, may be involved in the regulation of both energy intake and energy expenditure.
机译:许多小型哺乳动物通过形态,生理和行为的变化来应对光周期的季节性变化。在本研究中,我们测试了以下假设,即断奶前(从胚胎到断奶)光周期的经历可以影响体重和生热方面的后续发展。孕育布氏田鼠(Lasiopodomys brandtii)并在恒定的环境温度(SD,8 h:16 h L:D)或长光周期(LD,16 h:8 h L:D)下饲养并断奶。 23摄氏度)。断奶时,雄性幼鱼要么保持其初始光周期,要么转移至其他光周期8周。与LD田鼠相比,断奶后SD田鼠体重较低,但产热能力较高。同时,断奶前的光周期条件对生命后期的产热能力具有长期影响。血清瘦素浓度与体重和体脂肪量呈正相关,而与棕色脂肪组织中的能量摄入和蛋白质1脱钩呈负相关。我们的结果表明,在断奶后的体重和生热方面的发育主要受断奶后的光周期的影响,而断奶前的光周期经验可以长期改变生热的能力,但不会改变体重。此外,作为潜在的减肥信号的血清瘦素可能参与能量摄入和能量消耗的调节。

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