Behavioral inhibition of light-induced circadian phase resetting is phase and serotonin dependent

Brain Research
R E Mistlberger, Michael C Antle

Abstract

Circadian rhythms in Syrian hamsters can be phase shifted by light exposure during the subjective night and by a bout of wheel running induced during the subjective day. Interactions between photic and behavioral stimuli were examined by comparing phase shifts to 15 min, 50 lux light pulses with and without a bout of running induced by confinement to a novel wheel 30 min prior to and extending through light exposure. Light pulses 6 h after dark onset on the first night of constant dark induced phase advance shifts averaging 80 min. Wheel running attenuated these shifts by 45% on average (p<0.01). Light pulses 1 h or 2.25 h after dark onset induced phase delay shifts averaging 50 min and 20 min, respectively, that were not affected by stimulated running. A significant running response to the novel wheel was evident at all 3 time points, but was greater to wheel confinement at both times early in the night. Stimulated running alone early or late in the night did not produce significant phase shifts. Behavioral attenuation of phase advances to light late in the night was prevented by pretreatment with the general 5HT1 antagonist metergoline (2 mg/kg i.p.). Metergoline did not significantly attenuate running in novel wheels. These ...Continue Reading

Citations

Apr 16, 2003·Journal of Biological Rhythms·Michael C AntleRalph E Mistlberger
Apr 29, 1999·Annals of Medicine·L P Morin
Jun 28, 2005·The European Journal of Neuroscience·Mariska J VansteenselJohanna H Meijer
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