Arctic ground squirrel (Spermophilus parryii) hippocampal neurons tolerate prolonged oxygen-glucose deprivation and maintain baseline ERK1/2 and JNK activation despite drastic ATP loss

Sherri L. Christian, Austin P. Ross, Huiwen W. Zhao, Heidi J. Kristenson, Xinhua Zhan, Brian T. Rasley, Philip E. Bickler, Kelly L. Drew

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Oxygen-glucose deprivation (OGD) initiates a cascade of intracellular responses that culminates in cell death in sensitive species. Neurons from Arctic ground squirrels (AGS), a hibernating species, tolerate OGD in vitro and global ischemia in vivo independent of temperature or torpor. Regulation of energy stores and activation of mitogen-activated protein kinase (MAPK) signaling pathways can regulate neuronal survival. We used acute hippocampal slices to investigate the role of ATP stores and extracellular signal-regulated kinase (ERK)1/2 and Jun NH2-terminal kinase (JNK) MAPKs in promoting survival. Acute hippocampal slices from AGS tolerated 30 mins of OGD and showed a small but significant increase in cell death with 2 h OGD at 37°C. This tolerance is independent of hibernation state or season. Neurons from AGS survive OGD despite rapid ATP depletion by 3 mins in interbout euthermic AGS and 10 mins in hibernating AGS. Oxygen-glucose deprivation does not induce JNK activation in AGS and baseline ERK1/2 and JNK activation is maintained even after drastic depletion of ATP. Surprisingly, inhibition of ERK1/2 or JNK during OGD had no effect on survival, whereas inhibition of JNK increased cell death during normoxia. Thus, protective mechanisms promoting tolerance to OGD by AGS are downstream from ATP loss and are independent of hibernation state or season.

Original languageEnglish (US)
Pages (from-to)1307-1319
Number of pages13
JournalJournal of Cerebral Blood Flow and Metabolism
Volume28
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

Keywords

  • Acute hippocampal slices
  • ATP
  • Hibernation
  • Ischemia
  • MAPK ERK
  • MAPK JNK

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

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