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首页> 外文期刊>Canadian Journal of Zoology >Photoperiod alters pain responsiveness via changes in pelage characteristics
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Photoperiod alters pain responsiveness via changes in pelage characteristics

机译：光周期通过改变皮骨特性改变疼痛反应

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摘要

Small mammals use day length to adjust morphology and physiology to anticipate seasonal changes in environmental conditions. The canonical photoperiod-mediated annual adaptation is seasonal breeding. However, increasing evidence suggests that day-length information can induce plasticity in the nervous system, and thus provoke behavioral plasticity that can aid in winter survival. We hypothesized that low temperatures and reduced food availability in the winter would necessitate the evolution of increased pain tolerance mediated by short day lengths. Siberian hamsters (Phodopus sungorus (Pallas, 1773)) housed in short days regressed their reproductive tracts and molted to winter pelage. Short-day hamsters also displayed elevated latencies of nociceptive responses in the hot-plate test, suggesting reduced pain responsivity. Prior to assessing potential neuronal or neuroendocrine mediators of altered pain responses, however, we investigated the possibility that changes in fur characteristics mediated photoperiod differences in pain responsivity. Removal of fur with a depilatory cream eliminated photoperiod differences in pain responsivity. Taken together, these data indicate that day length regulates thermal pain responses via changes in fur properties; also, changes in pelage properties have both thermoregulatory and thermal insulatory properties.
机译：小型哺乳动物利用天长来调整形态和生理，以预测环境条件的季节性变化。典型的光周期介导的年度适应是季节性繁殖。但是，越来越多的证据表明，日间信息可能会诱发神经系统的可塑性，从而激发行为可塑性，从而有助于冬季生存。我们假设冬季的低温和食物供应的减少将必然导致由短日照介导的增加的疼痛耐受性的演变。短时间内饲养的西伯利亚仓鼠（Phodopus sungorus（Pallas，1773））使它们的生殖道退化并蜕变成冬天的粗骨。短时仓鼠在热板试验中还显示出较高的伤害感受反应潜伏期，表明疼痛反应能力降低。然而，在评估疼痛反应改变的潜在神经元或神经内分泌介质之前，我们研究了毛皮特征的变化介导了疼痛反应性的光周期差异的可能性。用脱毛膏去除毛发可消除光周期对疼痛反应的差异。综上所述，这些数据表明日长可通过皮草特性的变化调节热痛反应。此外，皮草性质的变化同时具有热调节和热绝缘性质。

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