A neuronal ryanodine receptor mediates light-induced phase delays of the circadian clock

Jian M. Ding, Gordon F. Buchanan, Shelley A. Tischkau, Dong Chen, Liana Kuriashkina, Lia E. Faiman, Joan M. Alster, Peter S. McPherson, Kevin P. Campbell and Martha U. Gillette ()
Additional contact information
Jian M. Ding: Molecular and Integrative Physiology, the Neuroscience Program
Gordon F. Buchanan: Molecular and Integrative Physiology, the Neuroscience Program
Shelley A. Tischkau: Molecular and Integrative Physiology, the Neuroscience Program
Dong Chen: Molecular and Integrative Physiology, the Neuroscience Program
Liana Kuriashkina: Molecular and Integrative Physiology, the Neuroscience Program
Lia E. Faiman: Molecular and Integrative Physiology, the Neuroscience Program
Joan M. Alster: Computing and Communications Services Office, University of Illinois
Peter S. McPherson: Montreal Neurological Institute, McGill University
Kevin P. Campbell: College of Medicine, University of Iowa
Martha U. Gillette: Molecular and Integrative Physiology, the Neuroscience Program

Nature, 1998, vol. 394, issue 6691, 381-384

Abstract: Abstract Circadian clocks are complex biochemical systems that cycle with a period of approximately 24 hours. They integrate temporal information regarding phasing of the solar cycle, and adjust their phase so as to synchronize an organism's internal state to the local environmental day and night1,2. Nocturnal light is the dominant regulator of this entrainment. In mammals, information about nocturnal light is transmitted by glutamate released from retinal projections to the circadian clock in the suprachiasmatic nucleus of the hypothalamus. Clock resetting requires the activation of ionotropic glutamate receptors, which mediate Ca2+ influx3. The response induced by such activation depends on the clock's temporal state: during early night it delays the clock phase, whereas in late night the clock phase is advanced. To investigate this differential response, we sought signalling elements that contribute solely to phase delay. We analysed intracellular calcium-channel ryanodine receptors, which mediate coupled Ca2+ signalling. Depletion of intracellular Ca2+ stores during early night blocked the effects of glutamate. Activators of ryanodine receptors induced phase resetting only in early night; inhibitors selectively blocked delays induced by light and glutamate. These findings implicate the release of intracellular Ca2+ through ryanodine receptors in the light-induced phase delay of the circadian clock restricted to the early night.

Date: 1998
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DOI: 10.1038/28639

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