Gonadal and photoperiodic influences on body mass regulation in adult male and female prairie voles.
Gonadal and photoperiodic influences on body mass regulation in adult male and female prairie voles.
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DOI：
10.1152/ajpregu.1996.270.5.r1013
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发表时间：
1996-05
期刊：
影响因子：
--
通讯作者：
L. Kriegsfeld;R. Nelson
中科院分区：
文献类型：
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作者：
L. Kriegsfeld;R. Nelson
非热带动物通常利用光周期的年度变化来进行季节性调整，以促进生存和繁殖。为了应对冬天的能量需求，许多啮齿类动物会在冬天到来之前改变身体质量。光周期调节通常是由松果体激素褪黑激素介导的；褪黑素可以通过改变血性腺类固醇水平对体重产生主要影响或继而影响身体质量。本研究试图确定草原田鼠(Microtus Ochrogaster)是否会改变身体质量对短光周期的反应。性腺在体重调节中的作用也被评估。在实验1中，在短日间饲养的雄性动物比在长日间饲养的动物增加体重的速度更快。摘除性腺提高了短日龄田鼠的体重增长。这些数据表明，性腺有助于短光周期引起的雄性田鼠体重的变化。在实验2中，无论是否摘除卵巢，在短日间饲养的雌性动物比在长日间饲养的动物增加体重的速度更快。卵巢切除对长日照或短日照动物的体重都没有影响，这表明卵巢对光周期介导的雌性草原田鼠的体重变化没有贡献。综上所述，这些研究表明，雄性和雌性草原田鼠使用光周期信息来记录体重的季节性变化。
Nontropical animals commonly use the annual change in photoperiod to phase seasonal adjustments that promote survival and reproduction. To cope with the energetic requirements of winter, many rodents alter body mass in anticipation of winter. Photoperiodic adjustments are often mediated by the pineal hormone melatonin; melatonin can exert a primary effect on body mass or secondarily affect body mass by changing blood gonadal steroid levels. The present study sought to determine if prairie voles (Microtus ochrogaster) alter body mass in response to short photoperiods. The role of the gonads in body mass regulation was also assessed. In experiment 1, males housed in short days increased body mass at a greater rate than long-day animals. Gonadectomy enhanced the body mass gain in short-day voles. These data suggest that the gonads contribute to short photoperiod-induced changes in body mass in male voles. In experiment 2, females housed in short days increased body mass at a greater rate than long-day animals, regardless of whether the animals were ovariectomized. Ovariectomy did not affect body mass in either long- or short-day animals, suggesting that the ovaries do not contribute to photoperiod-mediated changes in body mass in female prairie voles. Taken together, these studies suggest that male and female prairie voles use photoperiodic information to time seasonal changes in body mass.