Effects of unsaturated fatty acids on torpor frequency and diet selection in Djungarian hamsters (Phodopus sungorus)
Effects of unsaturated fatty acids on torpor frequency and diet selection in Djungarian hamsters (Phodopus sungorus)
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DOI：
10.1242/jeb.113217
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发表时间：
2014-12-01
影响因子：
2.8
通讯作者：
Scherbarth, Frank
中科院分区：
文献类型：
--
作者：
Diedrich, Victoria;Steinlechner, Stephan;Scherbarth, Frank
必需多不饱和脂肪酸（PUFA）已被证明在冬眠哺乳动物中起着有益的作用。在一些物种中，大量的膳食多聚脂肪酸导致冬眠开始时间更早，冬眠时间更长，冬眠动物的比例更高。相比之下，饮食中PUFA与每日表现出短暂和浅的冬眠的异温动物的相关性研究较少。因此，研究人员使用不同多聚脂肪酸组成的饮食来研究对保加利亚仓鼠（Phodopus sungorus）自发日睡眠频率的影响。与早期的研究相反，我们感兴趣的是n-6与n-3 PUFA的比例是否会影响冬眠的表达，并与富含单不饱和脂肪酸（MUFA）的饮食进行比较。虽然我们发现，与喂食富含n-3 PUFA或MUFA的仓鼠相比，喂食富含n-6 PUFA的仓鼠的睡眠频率有积极影响，但后两组的睡眠频率并没有异常低。附加日粮选择实验结果表明，短光周期仓鼠选择的n-6 PUFA含量略高于n-3 PUFA含量（比例为1∶1.5）。然而，饮食选择组和以n-6多聚脂肪酸超标7倍的标准食物喂养的仓鼠在冬眠频率上没有显著差异。综上所述，目前的数据强烈表明，不饱和脂肪酸的膳食组成在保加利亚仓鼠自发日睡的发生中起着次要作用。
Essential polyunsaturated fatty acids (PUFA) have been shown to play a beneficial role in hibernating mammals. High amounts of dietary PUFA led to an earlier hibernation onset, deeper and longer hibernation bouts and a higher proportion of hibernating animals in several species. In contrast, the relevance of dietary PUFA for daily heterotherms exhibiting only brief and shallow torpor bouts is less well studied. Therefore, diets differing in PUFA composition were used to examine the effects on the frequency of spontaneous daily torpor in Djungarian hamsters (Phodopus sungorus). In contrast to earlier studies, we were interested in whether the ratio of n-6 to n-3 PUFA affects torpor expression, and in comparison with a diet rich in monounsaturated fatty acids (MUFA). Although we found a positive effect on torpor frequency in hamsters fed a diet rich in n-6 PUFA compared with the groups fed diets either rich in n-3 PUFA or MUFA, the latter two groups did not show unusually low torpor frequencies. The results of the additional diet choice experiment indicated that hamsters in short photoperiod select food with only a slight excess of n-6 PUFA compared with n-3 PUFA (ratio of 1 to 1.5). However, there was no significant difference in torpor frequency between the diet choice group and hamsters fed on standard chow with a sevenfold excess of n-6 PUFA. In summary, the present data strongly indicate that the dietary composition of unsaturated fatty acids plays a minor role in the occurrence of spontaneous daily torpor in Djungarian hamsters.