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达乌尔黄鼠产热的季节性变化

张淑珍,李庆芬,黄晨西   

  1. 北京师范大学生物系,北京
  • 出版日期:2006-08-02 发布日期:2008-07-07

SEASONAL VARIATIONS OF THERMOGENESIS IN DAURIAN GROUND SQUIRREL (CITLLUS DAURICUS)

ZHANG Shuzhen , LI Qingfen , HUANG Chenxi   

  • Online:2006-08-02 Published:2008-07-07

摘要: 达乌尔黄鼠(Citellus dauricus)的产热表现出明显的季节性变化。在非冬眠期,静止代谢率(RMR)和非颤抖性产热(NST)于春季最高,秋季次之,夏季最底。冬眠期,RMR降到极底水平,只为春季的3.0%。肝脏的线粒体蛋白含量、线粒体呼吸和细胞色素C氧化酶活力在秋季显著高于其他各季。褐色脂肪组织(BAT)的重量、线粒体蛋白含量、细胞色素C氧化酶活力和a-磷酸甘油氧化酶活力,在夏季处于一年中的最低水平,到了冬季这些指标达到一年中的最高水平。在非冬眠季节BAT产热能力升高时,NST能力也相应升高,这表明BAT产热能力的增强使NST能力提高的部分机制。达乌尔黄鼠血清T4含量在年周期中没有明显改变,冬眠时血清T3含量显著高于其他各季。

关键词: 达乌尔黄鼠, 季节性产热, 肝脏, 褐色脂肪组织

Abstract: The thermogenesis of Daurian ground squirrel (Citellus dauricus) showed apparent seasonal variation . Resting metabolic rate (RMR) and non-shivering thermogenesis (NST) in non-hibernating seasons were the highest in spring and the lowest in summer . RMR keeped extremly low during hibernation . The pratein content , respiration and activity of cytochrome C oxidase of liver mitochondria were much higher in autumn than in other seasons . The wet weight , mitochondrial protein content , activities of cytochrome C oxidase and a-phoshphoglycerol oxidase of brown adipose tissue (BAT) were the lowest in summer and the highest during hibernation . The increase of thermogenic capacity of BAT corresponded to the increase of NST , suggesting that BAT themogenesis was responsible for NST . Serum T4 concentration in Daurian ground squirrel did not change significantly in annual cycle , but serum T3 concentration was obviously higher during hibernation than in non-hibernating seasons .

Key words: Daurian ground squirrel (Citellus d auricus), Seasual thermogenesis, Liver, Brown adipose tissue