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The Journal of Neuroscience, January 15, 1999, 19(2):828-835
Rapid Resetting of the Mammalian Circadian Clock
Jonathan D. Best, Elizabeth S. Maywood, Karen L. Smith, and Michael H. Hastings Department of Anatomy, University of Cambridge, Cambridge CB2 3DY, United Kingdom
The suprachiasmatic nuclei (SCN) contain the principal circadian clock governing overt daily rhythms of physiology and behavior. The endogenous circadian cycle is entrained to the light/dark via direct glutamatergic retinal afferents to the SCN. To understand the molecular basis of entrainment, it is first necessary to define how rapidly the clock is reset by a light pulse. We used a two-pulse paradigm, in combination with cellular and behavioral analyses of SCN function, to explore the speed of resetting of the circadian oscillator in Syrian hamster and mouse. Analysis of c-fos induction and cAMP response element-binding protein phosphorylation in the retinorecipient SCN demonstrated that the SCN are able to resolve and respond to light pulses presented 1 or 2 hr apart. Analysis of the phase shifts of the circadian wheel-running activity rhythm of hamsters presented with single or double pulses demonstrated that resetting of the oscillator occurred within 2 hr. This was the case for both delaying and advancing phase shifts. Examination of delaying shifts in the mouse showed resetting within 2 hr and in addition showed that resetting is not completed within 1 hr of a light pulse. These results establish the temporal window within which to define the primary molecular mechanisms of circadian resetting in the mammal.
Key words: suprachiasmatic nucleus; circadian rhythms; entrainment; immediate-early genes; light; CREB; circadian clock
Copyright © 1999 Society for Neuroscience 0270-6474/99/192828-08$05.00/0
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