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首页> 外文期刊>Canadian Journal of Zoology >Seasonal oxidative capacity of skeletal muscles in hibernating Daurian ground squirrels (Spermophilus dauricus)
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Seasonal oxidative capacity of skeletal muscles in hibernating Daurian ground squirrels (Spermophilus dauricus)

机译：冬眠的达赖尔松鼠（Spermophilus dauricus）骨骼肌的季节性氧化能力

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摘要

We investigated the mechanism of high oxidative capacity of skeletal muscles in hibernating Daurian ground squirrels {Spermophilus dauricus Brandt, 1843). Myoglobin (Mb) levels, as well as citrate synthase and lactate dehydrogenase (LDH) activities, were measured by spectrophotometry. Mb content in the soleus (SOL) muscle lasted from the beginning of hibernation to spring. Mb content in SOL was 87% higher in the hibernating group than in the summer group. Mb content in the extensor digitorum longus (EDL) muscle stayed at similar levels during the different periods of the year. Citrate synthase activity in SOL was 30% higher in the hibernating group than in the summer group. Meanwhile, citrate synthase activity in EDL did not change during hibernation. LDH activity in SOL was not different between the hibernating group and the summer active group, whereas LDH activity in EDL increased significantly (up to 11%) in the 2 days arousal after hibernation group compared with the hibernating group. We conclude that high oxidative capacity is provided by increased oxygen storage capacity of slow-twitch muscle fibers rather than from fast-twitch muscle fibers in hibernating animals.
机译：我们研究了冬眠的达里尔松鼠骨骼肌高氧化能力的机制（Spermophilus dauricus Brandt，1843）。通过分光光度法测量肌红蛋白（Mb）水平以及柠檬酸合酶和乳酸脱氢酶（LDH）活性。比目鱼肌中的Mb含量从冬眠开始一直持续到春季。冬眠组的SOL中Mb含量比夏季组高87％。在一年中的不同时期，趾长伸肌（EDL）肌肉中的Mb含量保持在相似的水平。冬眠组的SOL中柠檬酸合酶活性比夏季组高30％。同时，EDL中的柠檬酸合酶活性在冬眠期间没有变化。与冬眠组相比，冬眠组和夏季活动组的SOL中LDH活性没有差异，而在冬眠组唤醒后2天，EDL中的LDH活性显着增加（高达11％）。我们得出结论，在冬眠的动物中，高氧化能力是由缓慢抽搐的肌肉纤维而不是快速抽搐的肌肉纤维增加的储氧能力提供的。

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