Photic resetting of intrinsic rhythmicity of the rat suprachiasmatic nucleus under various photoperiods

The American Journal of Physiology
A Sumová, H Illnerová

Abstract

To date, photic entrainment of the mammalian circadian system has been studied by following phase shifts of overt rhythms in the periphery governed by a circadian pacemaker located in the suprachiasmatic nucleus (SCN). The present study follows for the first time photic resetting of intrinsic rhythmicity of the SCN itself. Rats maintained under either a shorter photoperiod, with 12 h of light and 12 h of darkness per day, or under a long, 18:6-h light-dark photoperiod were exposed to a light stimulus during the dark period and then released into darkness, and the next day the SCN rhythm in the light-stimulated c-Fos protein immunoreactivity was followed as a marker of the SCN endogenous rhythmicity. After a light stimulus in the early night, the evening rise in the photic elevation of Fos protein photoinduction as well as the morning decline were phase delayed within one cycle. After a light stimulus in the late night, only the morning decline in the photic elevation of Fos was phase advanced the next night, not the evening rise; consequently, the interval enabling high photic elevation of Fos was reduced. After a light stimulus was administered around the middle of the night, the next night the evening rise in the light-stimul...Continue Reading

References

Nov 15, 1991·Proceedings of the National Academy of Sciences of the United States of America·L A KobierskiM J Comb
Jan 1, 1986·Journal of Biological Rhythms·M E Harrington, B Rusak
Aug 1, 1987·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·H Illnerová, J Vanĕcek
Aug 15, 1995·Proceedings of the National Academy of Sciences of the United States of America·A SumováH Illnerová
Feb 13, 1995·The Journal of Comparative Neurology·R Y MooreJ P Card
Nov 24, 1995·Neuroscience Letters·A SumováH Illnerová

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Citations

Aug 23, 2003·Journal of Biological Rhythms·Mariska J VansteenselJohanna H Meijer
Nov 18, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·A SumováH Illnerová

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