NADH hyperoxidation correlates with enhanced susceptibility of aged rats to hypoxia.

Published

Journal Article

Aging increases mitochondrial dysfunction and susceptibility to hypoxia. Previous reports have indicated an association between post-hypoxic hyperoxidation of intra-mitochondrial enzymes and delayed neuronal injury. Therefore we investigated the relationship between NADH fluorescence and neuronal function during and after hypoxia across the lifespan. Hippocampal slices were prepared from adult (1 to >22 months) F344 rats. NADH fluorescence, extracellular voltage and tissue PO(2) were recorded from the CA1 region during hypoxia (95% N(2)) of various lengths following onset of hypoxic spreading depression (hsd). Slices from younger rats recovered evoked neuronal responses to a greater degree and exhibited less hyperoxidation after a hypoxic episode, than slices from older rats. However, the use of Ca(2+) free-media in slices from >22 month old rats improved recovery and delayed NADH hyperoxidation (2.5 min hypoxia after hsd). Post-hypoxic decrease of NADH fluorescence (hyperoxidation) was age dependent and correlated with decreased neuronal recovery. Slices exposed to repeated hypoxic episodes yielded data suggesting depletion of the NAD(+) pool, which may have contributed to the deterioration of neuronal function.

Full Text

Duke Authors

Cited Authors

  • Foster, KA; Margraf, RR; Turner, DA

Published Date

  • April 2008

Published In

Volume / Issue

  • 29 / 4

Start / End Page

  • 598 - 613

PubMed ID

  • 17184883

Pubmed Central ID

  • 17184883

Electronic International Standard Serial Number (EISSN)

  • 1558-1497

Digital Object Identifier (DOI)

  • 10.1016/j.neurobiolaging.2006.11.006

Language

  • eng

Conference Location

  • United States