INFLUENCE OF PHOTOPERIOD ON PINEAL MELATONIN SYNTHESIS, FUR COLOR, BODY-WEIGHT, AND REPRODUCTIVE FUNCTION IN THE FEMALE DJUNGARIAN HAMSTER, PHODOPUS-SUNGORUS
INFLUENCE OF PHOTOPERIOD ON PINEAL MELATONIN SYNTHESIS, FUR COLOR, BODY-WEIGHT, AND REPRODUCTIVE FUNCTION IN THE FEMALE DJUNGARIAN HAMSTER, PHODOPUS-SUNGORUS
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DOI：
10.1159/000126380
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发表时间：
1993-01-01
影响因子：
4.1
通讯作者：
SCHLATT, S
中科院分区：
文献类型：
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作者：
LERCHL, A;SCHLATT, S
为了研究雌性Djungarian仓鼠对光周期变化的反应，进行了以下两个实验。实验一：将雌性仓鼠随机分为短日照（8L：16 D）和长日照（16 L：8D）两组，每组38周。最初，短日照组显示体重下降，与性腺功能和皮毛颜色的变化有关。短日照组没有保持这一点，在大多数情况下，短日照组恢复到长日照水平，从而对这种退化的照明方案变得不敏感。这些事件的时间过程与在男性中观察到的时间过程比较好，这表明了一种共同的机制。实验二：将两组雌性仓鼠分别暴露于长日照和短日照条件下8周。在测试期结束时，松果体褪黑激素，5-羟色胺，羟吲哚乙酸，和血清褪黑激素含量的昼夜变化进行了估计，揭示了两组之间的显着差异。不仅有一个在短日照动物中观察到的褪黑激素合成的延长，但也有一个显着的褪黑激素水平的升高相比，长日照动物。连同最近的研究结果在男性中，这些研究结果支持的假设，在Djungarian仓鼠，夜间褪黑激素水平的升高可能是额外的意义，相对于短日照诱导的生理变化。
In order to investigate female Djungarian hamsters' reactions to changes of the photoperiod, the following two experiments were performed. Experiment I: Age-matched female hamsters were exposed to either short (8L:16D) or long days (16L:8D) for 38 weeks. Initially, the short-day group showed a decline in body weight, associated with changes in gonadal function and fur color. This was not maintained by the short-day group which returned, on the most part, to long-day levels, thus becoming insensitive to this regressive lighting regimen. The time courses of these events compare well with those observed in males, which suggests a common mechanism. Experiment II: Two groups of female hamsters were exposed for 8 weeks to either long days or short days. At the end of the test period, the diurnal variations in pineal content of melatonin, serotonin, hydroxyindole acetic acid, and serum melatonin were estimated, revealing marked differences between the two groups. Not only was there a prolongation of melatonin synthesis observed in the short-day animals, but there was also a significant elevation of the melatonin levels when compared to the long-day animals. Together with recent findings in males, these findings lend support to the hypothesis that, in the Djungarian hamster, the elevation of nocturnal melatonin levels may be of additional significance, with respect to the physiological changes induced by short-day photoperiods.