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SHR Neuro Cancer Cardio Lipid Metab Microb

Jiang, SF; Guo, SP; Xue, W; Wang, HP; Goswami, N; Gao, YF; .
Seasonal oxidative capacity of skeletal muscles in hibernating Daurian ground squirrels (Spermophilus dauricus).
CAN J ZOOL. 2015; 93(8): 593-598. Doi: 10.1139/cjz-2015-0027
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Co-authors Med Uni Graz: Goswami Nandu
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Abstract:: 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 (SQL) muscle lasted from the beginning of hibernation to spring. Mb content in SQL 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 SQL 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 SQL 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.
Find related publications in this database (Keywords): hibernation; enzymes; myoglobin; Daurian ground squirrels; Spermophilus dauricus