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Biology of Reproduction, Vol 44, 604-608, Copyright © 1991 by Society for the Study of Reproduction
ARTICLES |
CS Colwell, M Max, D Hudson and M Menaker
Department of Biology, University of Virginia, Charlottesville 22901.
Seasonal regulation of reproduction occurs in golden hamsters (Mesocricetus auratus) in response to changes in day length (photoperiod). We report here the results of experiments designed to evaluate whether excitatory amino acid neurotransmission is involved in mediating the effects of light on reproduction. We found that MK-801, a specific antagonist of the N-methyl-D-aspartate subclass of excitatory amino acid receptors, blocked the stimulatory action of short pulses of light on gonadal function in hamsters maintained in short days. Furthermore, MK-801 also inhibited the light-induced decline in pineal melatonin content. These findings suggest that excitatory amino acids may mediate the effects of light on the reproductive system.
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C. S. Colwell and M. Menaker NMDA as Well as Non-NMDA Receptor Antagonists Can Prevent the Phase-Shifting Effects of Light on the Circadian System of the Golden Hamster J Biol Rhythms, July 1, 1992; 7(2): 125 - 136. [Abstract] [PDF] |
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