PHOTOPERIODIC RESPONSES IN DJUNGARIAN HAMSTERS (PHODOPUS-SUNGORUS) - IMPORTANCE OF LIGHT HISTORY FOR PINEAL AND SERUM MELATONIN PROFILES
PHOTOPERIODIC RESPONSES IN DJUNGARIAN HAMSTERS (PHODOPUS-SUNGORUS) - IMPORTANCE OF LIGHT HISTORY FOR PINEAL AND SERUM MELATONIN PROFILES
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DOI：
10.1095/biolreprod51.4.714
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发表时间：
1994-10-01
影响因子：
3.6
通讯作者：
NIESCHLAG, E
中科院分区：
文献类型：
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作者：
NIKLOWITZ, P;LERCHL, A;NIESCHLAG, E
雄性丛林仓鼠经历过每天16h光照的长光周期(16L：8D)或短光周期(8L：16D)，被转移到相反的光周期或中间光周期(14L：10D)。研究表明，相同的中间光周期对毛色、体重和生殖系统都有抑制或促进作用，这取决于先前的光照历史。根据日长的变化程度对反应进行分级。尽管对相同的光周期有相反的反应，松果体中褪黑激素的昼夜模式是相同的。然而，光抑制仓鼠血清中的褪黑激素昼夜节律模式比光刺激动物的血清中发现的更明显的夜间升高。在对短光周期无反应的仓鼠中，没有发现适当的短日模式。褪黑素的产生是一个高度动态的过程，在长时间暴露于短光周期期间，会导致松果体的浓度变化和血清幅度的变化。对相同光周期的不同反应与不同的血清褪黑素模式有关，如图所示。
Male Djungarian hamsters with previous light experience of long photoperiods of 16 h of light per day (16L:8D) or short photoperiods (8L:16D) were transferred either to the opposite photoperiods or to intermediate photoperiods (14L:10D). It was demonstrated that the same intermediate photoperiod could exert inhibitory or stimulatory effects on coat color, body weight, and the reproductive system, dependent on the previous light history. The response was graduated in accordance with the degree of change in day length. Despite opposite responses to the same photoperiod, diurnal patterns of melatonin in the pineal glands were identical. However, the circadian melatonin pattern in serum of photoinhibited hamsters had a more pronounced nighttime elevation than that found in the serum of photostimulated animals. In hamsters nonresponsive to short photoperiods, no proper short-day pattern was found. Melatonin production is a highly dynamic process, causing concentration shifts in the pineal gland and changes in the serum amplitude during prolonged exposure to short photoperiods. The different reactions to identical photoperiods are associated with different serum melatonin patterns, as shown here for the first time.