Potentiation of lipid peroxides by ischemia in rat brain

K. Kogure, B. D. Watson, R. Busto, K. Abe

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154 Scopus citations

Abstract

Post-ischemic changes in energy metabolites and natural antioxidant compounds have been measured in rat brain in vitro concurrent with two different assays for peroxidized lipids. No exogenous free radical initiators were employed. In vitro oxygenation of minced brain preparations for periods of 10 minutes to 4 hours, following 5 minutes of preparatory ischemia, yielded increased levels of lipid conjugated dienes and TBA-reactive material, in contrast to anaerobically incubated preparations. However, either aerobic or anaerobic incubation of brain minces facilitated increased ratios of lactate: pyruvate and glutathione (oxidized): glutathione (reduced), as well as increased total ubiquinone content and loss of α-tocopherol. Observation of lipid radical formation in vivo was then attempted using rats given embolic stroke in one hemisphere and left in the post-ischemic condition for times up to 24 hours. Conjugated dienes were found in lipids extracted from the ipsilateral hemisphere but not from the contralateral hemisphere. These observations of conjugated dienes in vivo (formed presumably during post-ischemic reperfusion) and in vitro (facilitated by oxygenation of brain minces), indicate that lipid radical intermediates and associated chain peroxidation processes are potentiated by ischemia and occur during tissue reoxygenation.

Original languageEnglish (US)
Pages (from-to)437-454
Number of pages18
JournalNeurochemical Research
Volume7
Issue number4
DOIs
StatePublished - Apr 1 1982

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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    Kogure, K., Watson, B. D., Busto, R., & Abe, K. (1982). Potentiation of lipid peroxides by ischemia in rat brain. Neurochemical Research, 7(4), 437-454. https://doi.org/10.1007/BF00965496