Abstract
Seasonal hibernation is a poorly understood phenomenon and the details of how hibernation induction, maintenance and arousal are controlled are, for the most part, enigmatic. Hibernating golden-mantled ground squirrels, Spermophilus lateralis, were treated with MK801, a non-competitive antagonist of the NMDA-type glutamate receptor, as part of a larger investigation of the role of these receptors in the control of breathing in this species. Drug treatment prompted arousal from hibernation at a dose of 5.0 mg/kg, but not at a dose of 0.5 mg/kg. We have previously demonstrated that similar treatment prevents sleep and sleep-like states of cortical arousal in unanesthetized and anesthetized squirrels. As removal of NMDAtype glutamatergic activation resulted in arousal, the data suggest that arousal is normally actively inhibited; glutamatergic inhibition facilitates stable hibernation and NMDA-type glutamatergic blockade results in a disinhibition of arousal mechanisms, resulting in arousal from hibernation. The similarity between the present results and those pertaining to sleep in non-hibernating squirrels supports the theoretical homology between hibernation and sleep. This research was supported by the Natural Sciences and Engineering Research Council of Canada, and results have been submitted for peer-reviewed publication in primary literature.
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Harris, M.B., Milsom, W.K. (2000). Is Hibernation Facilitated by an Inhibition of Arousal?. In: Heldmaier, G., Klingenspor, M. (eds) Life in the Cold. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04162-8_26
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DOI: https://doi.org/10.1007/978-3-662-04162-8_26
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