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首页> 外文期刊>American Journal of Physiology >Conflicting effects of exercise on the establishment of a short-photoperiod phenotype in Syrian hamster.
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Conflicting effects of exercise on the establishment of a short-photoperiod phenotype in Syrian hamster.

机译：运动对叙利亚仓鼠建立短光周期表型的影响相互矛盾。

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In the Syrian hamster, winter seasonal inhibition of reproduction occurs in response to decreasing day length. This inhibitory response is modulated by nonphotic cues. In particular, access to a running wheel has been shown to produce incomplete gonadal regression. The present study sought to determine whether this occurs as a consequence of wheel effect on adaptation of the circadian system to short days or whether downstream physiological responses are involved. Short-day adaptation of the circadian clock, which is located in the suprachiasmatic nucleus (SCN) of the hypothalamus, was tested by lengthening the photosensitive phase of the SCN (assayed by light-induced c-Fos expression in the SCN) as a parameter. We found that wheel-running activity does not inhibit the integration of the photoperiodic change by the SCN even if complete testicular regression is prevented. Moreover, this exercise was even capable of accelerating the lengthening of the photosensitive phase after the transfer to short day length. Thus, although wheel-running activity inhibits the short photoperiod-induced gonadal regression, it acts on the SCN to accelerate the integration of the photoperiodic change by the biological clock.
机译：在叙利亚仓鼠中，冬季的季节性繁殖抑制是由于白天长度的减少而引起的。这种抑制反应受非光信号的调节。特别是，已证明接近运行轮会导致不完整的性腺退化。本研究试图确定这是否是由于轮效应对昼夜节律系统适应短日的影响或是否涉及下游生理反应。通过延长SCN的光敏期（通过SCN中光诱导的c-Fos表达进行分析），测试了位于下丘脑上眼睑上核（SCN）中的生物钟的短日适应性。 。我们发现，即使防止了彻底的睾丸退化，转轮活动也不会抑制SCN对光周期变化的整合。而且，该运动甚至能够在转移到短日间长度后加速光敏相的延长。因此，尽管车轮行驶活动抑制了短暂的光周期诱发的性腺退化，但它作用于SCN以加速生物钟对光周期变化的整合。

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