强氏仓鼠新陈代谢、体温和活动的多重超昼夜节律。

IF 1.7 3区 生物学 Q4 PHYSIOLOGY Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology Pub Date : 2024-08-01 Epub Date: 2024-07-05 DOI:10.1007/s00360-024-01569-x
Gerhard Heldmaier, Luzie Braulke, Johanna Flick, Thomas Ruf
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引用次数: 0

摘要

生活在恒定 15 °C、短光周期(8:16 h L:D)条件下的滇仓鼠(Phodopus sungorus)表现出明显的新陈代谢率(MR)、体温(Tb)和运动活动的超昼夜节律(UR)。不同个体的超昼夜节律模式不同,且随时间而变化。新陈代谢率(MR)、体温(Tb)和活动(UR)的周期长度虽然不尽相同,但却相似。小波分析表明,有三种不同的UR并行存在,即小振幅和短持续时间的UR(UR小)、中等振幅和中等持续时间的UR(UR中)和大振幅的UR(UR大),它们相互叠加。大振幅UR伴随着运动活动的增加,而小振幅UR和中振幅UR则源于新陈代谢,缺乏或延迟活动反应。寒冷带来的能量挑战使总能量需求增加了约50%,但这并没有加快URs的周期长度,反而延长了URsmall和URmedium的振幅。UR大与之前研究中描述的活动、进食和饮水、睡眠和唤醒的UR相对应,这与中脑多巴胺能信号和下丘脑超昼夜节律信号有关。UR中和UR小的原因和控制尚不清楚。它们的周期与中枢和外周内分泌的昼夜节律信号周期相似,这表明它们与新陈代谢的昼夜节律信号有关。
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Multiple ultradian rhythms of metabolism, body temperature and activity in Djungarian hamsters.

Djungarian hamsters (Phodopus sungorus) living at constant 15 °C Ta in short photoperiod (8:16 h L:D) showed pronounced ultradian rhythms (URs) of metabolic rate (MR), body temperature (Tb) and locomotor activity. The ultradian patterns differed between individuals and varied over time. The period length of URs for MR, Tb and activity was similar although not identical. Wavelet analysis showed that three different URs are existing in parallel, URs of small amplitude and short duration (URsmall), URs of medium amplitude and medium duration (URmedium) and URs of large amplitude (URlarge), superimposed on each other. URlarge were accompanied by an increase in locomotor activity, whereas URsmall and URmedium were of metabolic origin with lacking or delayed responses of activity. An energetic challenge to cold which raised total energy requirements by about 50% did not accelerate the period length of URs, but extended the amplitude of URsmall and URmedium. URlarge corresponds with the URs of activity, feeding and drinking, sleep and arousal as described in previous studies, which are related to midbrain dopaminergic signalling and hypothalamic ultradian signalling. The cause and control of URmedium and URsmall is unknown. Their periods are similar to periods of central and peripheral endocrine ultradian signalling, suggesting a link with URs of metabolism.

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来源期刊
CiteScore
3.90
自引率
0.00%
发文量
51
审稿时长
3.5 months
期刊介绍: The Journal of Comparative Physiology B publishes peer-reviewed original articles and reviews on the comparative physiology of invertebrate and vertebrate animals. Special emphasis is placed on integrative studies that elucidate mechanisms at the whole-animal, organ, tissue, cellular and/or molecular levels. Review papers report on the current state of knowledge in an area of comparative physiology, and directions in which future research is needed.
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