PMID: 8946257Dec 1, 1996Paper

Reentrainment of motor activity and spontaneous neuronal activity in the suprachiasmatic nucleus of Djungarian hamsters

Journal of Biological Rhythms
W PuchalskiG R Lynch

Abstract

Neurons in the suprachiasmatic nucleus (SCN) of the hypothalamus exhibit a daily rhythm in spontaneous electrical activity. Essentially two methods have been employed to record this circadian rhythm: (1) an in vitro brain slice technique and (2) in vivo multiunit recordings. Reentrainment of a circadian output to a shifted light:dark cycle commonly takes several cycles (depending on the amount of shift) until completed. Such a resetting kinetic has also been shown to be valid for SCN electrical activity if recorded in vivo. In an in vitro slice preparation, however, pharmacologically induced resetting is much faster and lacks transients; that is, a shift is completed within one cycle. This study was designed to probe for the presence of transients in the neuronal activity of the SCN in a brain slice preparation. The authors exposed Djungarian hamsters to an 8-h advanced or delayed light:dark cycle and monitored wheel-running activity during reentrainment. Additional groups of identically treated hamsters were used to record the pattern of spontaneous neuronal activity within the SCN using the brain slice preparation. Neuronal activity exhibited the usual rhythm with high firing rates during the projected day and low firing rate...Continue Reading

References

Jan 16, 1976·Science·M H Stetson, M Watson-Whitmyre
Aug 1, 1991·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·W Puchalski, G R Lynch
Nov 1, 1989·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·H IllnerováL Maslova
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Citations

Dec 24, 1997·Neuroscience Letters·U Redlin, G R Lynch
Jun 28, 2012·Chronobiology International·Yuval WeiglIsrael E Ashkenazi
Dec 14, 2007·Chronobiology International·Dietmar Weinert, Konrad Schottner
Mar 3, 1999·Perceptual and Motor Skills·C SüerO Sahin
Dec 24, 1997·Journal of Biological Rhythms·H Illnerová, A Sumová

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