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Regional lipid peroxidation in rat brain in vitro: Possible role of endogenous iron

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Abstract

Lipoperoxidative capacity of various brain areas of aging rats was examined in vitro using the thiobarbituric acid test. Significant regional differences in the generation of lipid peroxides were found in freshly prepared homogenates from different areas of brain incubated under air. Incubation under oxygen resulted in marked stimulation of lipid peroxidation, with highest increases in hypothalamus (144%). Addition of exogenous Fe2+ and ascorbic acid resulted in stimulation of lipid peroxidation ranging from 10-fold in cortex to 20-fold in hypothalamus homogenates during incubation in air. A linear relationship was found between endogenous iron content in brain regions and their ability to produce lipid peroxides in vitro under oxygen for all areas except striatum. Several iron chelating agents effectively inhibited lipid peroxidation under hyperbaric oxygen whereas oxygenfree radical scavengers, as well as catalase and superoxide dismutase were not effective. It is concluded that regional differences in lipoperoxidative capacity of brain areas in vitro are in part governed by local endogenous iron content and may indicate regional susceptibility to oxidative damage.

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  1. Biomembrane Research Program, Oklahoma Medical Research Foundation, 825 Northeast Thirteenth Street, 73104, Oklahoma City, Oklahoma

    Malgorzata M. Zaleska & Robert A. Floyd

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  1. Malgorzata M. Zaleska
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Zaleska, M.M., Floyd, R.A. Regional lipid peroxidation in rat brain in vitro: Possible role of endogenous iron. Neurochem Res 10, 397–410 (1985). https://doi.org/10.1007/BF00964608

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