Abstract
Hibernation, a means of systemic energy conservation, defies the need for most life-sustaining processes. Hibernation is recognized by a state of prolonged torpor where whole body metabolic rate, core body temperature (T b), heart rate, and blood flow decrease to 1–10 % of values observed during sleep. These bouts of torpor are interrupted at regular intervals by brief episodes of heterogeneous rewarming and reperfusion of vital organs, including the brain. Despite the reduction of cerebral blood flow during torpor or the return of cerebral blood flow during interbout arousals, hibernation produces no evidence of neuropathology. Multiple adaptations, at the whole animal and tissue levels, during torpor reveal a combination therapy–like scenario that likely contributes to ischemic tolerance. Nonetheless, some hibernating species tolerate ischemic-like cerebral blood flow even when not hibernating outside of the hibernation season and when T b is maintained at 37 °C. The arctic ground squirrel (Urocitellus parryii), a species studied extensively as a model of cerebral ischemia tolerance, resists neuronal pathology following cardiac arrest in vivo and following various paradigms designed to mimic cerebral ischemia in brain slices and cultured neurons. Here we review evidence that supports and refutes hypothesized mechanisms of ischemia tolerance in arctic ground squirrels with the caveat that much remains to be learned about mechanisms of ischemia tolerance in arctic ground squirrels and in other mammalian hibernators. Although hibernating mammals resist injury following cerebral ischemia/reperfusion even when not hibernating, torpor nonetheless is a phenotype with obvious neuroprotective advantages including cold tissue temperatures, a decrease in metabolic demand, and suppressed immune responsiveness. Thus we also review recent breakthroughs in the understanding of how the central nervous system regulates the onset of hibernation and discuss prospects for inducing hibernation in humans.
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Acknowledgments
This work was supported by the US Army Research Office W911NF-05-1-0280, the US Army Medical Research and Materiel Command 05178001, the National Institute of Neurological Disorders and Stroke NS041069-06 and R15NS070779, and Alaska INBRE and Alaska EPSCoR. The authors acknowledge Bianca Zuckerman for assistance with MRI angiography and data analysis. The authors also acknowledge Daniel Kirschner, Thomas Green and Kili Wetherell for assistance with microperfusion experiments and glutamate analysis.
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Drew, K.L., Zuckerman, J.A., Shenk, P.E., Bogren, L.K., Jinka, T.R., Moore, J.T. (2013). Hibernation: A Natural Model of Tolerance to Cerebral Ischemia/Reperfusion. In: Gidday, J., Perez-Pinzon, M., Zhang, J. (eds) Innate Tolerance in the CNS. Springer Series in Translational Stroke Research. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9695-4_3
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