Jacob N, Vuillez P, Pévet P
URA-CNRS 1332, Neurobiologie des fonctions rythmiques et saisonnières,Université Louis Pasteur, Strasbourg, France.
Neurosci Lett. 1997 Jun 27;229(2):117-20. doi: 10.1016/s0304-3940(97)00428-x.
The duration of the sensitive phase to light of the suprachiasmatic nuclei, in terms of Fos protein expression, depends on the photoperiod. In Syrian hamsters, a 4 h lengthening of the photosensitive phase occurs within 3-4 weeks after a transfer from a long to a short photoperiod. The absence of endogenous melatonin following pinealectomy does not prevent the lengthening of the photosensitive phase. Thus, even if the pineal production is able to convey photoperiodic information, it does not feed back on the circadian clock to allow its integration.
就Fos蛋白表达而言，视交叉上核的光敏感阶段的持续时间取决于光周期。在叙利亚仓鼠中，从长光周期转移到短光周期后3 - 4周内，光敏感阶段会延长4小时。松果体切除后内源性褪黑素的缺失并不妨碍光敏感阶段的延长。因此，即使松果体的分泌能够传递光周期信息，它也不会反馈到昼夜节律时钟以使其整合。
