Sumová A, Trávnícková Z, Illnerová H
Institute of Physiology, Academy of Sciences of the Czech Republic, Prague.
Neurosci Lett. 1995 Nov 24;200(3):191-4. doi: 10.1016/0304-3940(95)12109-h.
In order to follow adjustment of the rat circadian pacemaking system to a change of the photoperiod, the rhythm in the light-induced c-fos expression was used as a marker of the intrinsic rhythmicity of the suprachiasmatic nucleus (SCN). After a change from a long photoperiod with 16 h of light per day to a short one with 8 h of light, the interval enabling high c-fos photoinduction decompressed gradually and the full extension by 5-6 h was achieved only within 2 weeks. After a change from a short to a long photoperiod, the interval was compressed by 5-6 h within 3 days. The data indicate a rapid adjustment of the photoperiod dependent-state of the SCN pacemaker to long days but only a slow one to short days.
为了追踪大鼠昼夜节律起搏系统对光周期变化的调整，将光诱导的c-fos表达节律用作视交叉上核（SCN）内在节律性的标志物。从每天光照16小时的长光周期转变为光照8小时的短光周期后，能够实现高c-fos光诱导的间隔逐渐延长，并且仅在2周内就实现了5-6小时的完全延长。从短光周期转变为长光周期后，该间隔在3天内缩短了5-6小时。数据表明，SCN起搏器的光周期依赖状态对长日照能快速调整，但对短日照调整缓慢。
