Journal of Comparative Physiology B

, Volume 180, Issue 5, pp 775–783 | Cite as

The role of succinate dehydrogenase and oxaloacetate in metabolic suppression during hibernation and arousal

Original Paper

Abstract

Hibernation elicits a major reduction in whole-animal O2 consumption that corresponds with active suppression of liver mitochondrial electron transport capacity at, or downstream of, succinate dehydrogenase (SDH). During arousal from the torpor phase of hibernation this suppression is reversed and metabolic rates rise dramatically. In this study, we used the 13-lined ground squirrel (Ictidomys tridecemlineatus) to assess isolated liver mitochondrial respiration during the torpor phase of hibernation and various stages of arousal to elucidate a potential role of SDH in metabolic suppression. State 3 and state 4 respiration rates were seven- and threefold lower in torpor compared with the summer-active and interbout euthermic states. Respiration rates increased during arousal so that when body temperature reached 30°C in late arousal, state 3 and state 4 respiration were 3.3- and 1.8-fold greater than during torpor, respectively. SDH activity was 72% higher in interbout euthermia than in torpor. Pre-incubating with isocitrate [to alleviate oxaloacetate (OAA) inhibition] increased state 3 respiration rate during torpor by 91%, but this rate was still fourfold lower than that measured in interbout euthermia. Isocitrate pre-incubation also eliminated differences in SDH activity among hibernation bout stages. OAA concentration correlated negatively with both respiration rates and SDH activity. These data suggest that OAA reversibly inhibits SDH in torpor, but cannot fully account for the drastic metabolic suppression observed during this hibernation phase.

Keywords

Hibernation Arousal Mitochondria Succinate dehydrogenase Oxaloacetate 

Abbreviations

CS

Citrate synthase

CoQ

Coenzyme Q

ETC

Electron transport chain

IMS

Intermembrane space

OAA

Oxaloacetate

SDH

Succinate dehydrogenase

Tb

Core body temperature

Notes

Acknowledgments

The authors wish to express their gratitude for financial support (Discovery Grants) from the Natural Sciences and Engineering Research Council (Canada). Alvin Iverson and his staff at the University of Manitoba Carman and Region Facility were very helpful in trapping animals. Jason C.L. Brown was very helpful with his assistance in the laboratory.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of BiologyUniversity of Western OntarioLondonCanada

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