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NMDA as Well as Non-NMDA Receptor Antagonists Can Prevent the Phase-Shifting Effects of Light on the Circadian System of the Golden Hamster
Christopher S. Colwell
Department of Biology, Gilmer Hall, University of Virginia, Charlottesville, Virginia 22901
Michael Menaker
Department of Biology, Gilmer Hall, University of Virginia, Charlottesville, Virginia 22901
The present experiments were designed to evaluate whether the intraventricular administration of excitatory amino acid (EAA) receptor antagonists would prevent light-induced phase shifts of the circadian rhythm of wheel-running activity in the hamster. Administration of the non-N-methyl-D-aspartate (non-NMDA) antagonist 6,7-dinitroquinoxaline-2,3-dione (DNQX) blocked light-induced phase advances and delays. Similarly, administration of the competitive NMDA receptor antagonist, 3(2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP), prevented light-induced phase advances and delays. Neither drug by itself caused any consistent effect on the phase of the rhythm. These data provide further evidence that EAA receptors mediate the effects of light on the circadian system, and suggest that both NMDA and non-NMDA receptor types may be involved.
Key Words: hamster circadian rhythm excitatory amino acids DNQX CPP
Journal of Biological Rhythms, Vol. 7, No. 2,
125-136 (1992)
DOI: 10.1177/074873049200700204

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