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Estimates of free-radical production in rat and swine hearts: method and application of measuring malondialdehyde levels in fresh and frozen myocardium

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Summary

Toxic peroxides result when oxygen radicals with various peroxidic precursors in tissue or blood. A colorimetric method based on reactions of malondialdehyde (MDA), a key intermediate in the formation of peroxides, has been described in fresh tissues. The present report adapts this assay to measure MDA levels in frozen heart muscle from rats and swine. Mean tissue values of MDA ranged from 154–353 nmol/g (n=13) in fresh rat hearts perfused by the Langendorff technique. Values in frozen samples were 228±14 nmol MDA/g (n=22). When mechanical function was increased in isolated working rat hearts, tissue MDA levels decreased by-25‡% (P<0.025). In working swine hearts, increasing perfusate levels of unsaturated fatty acids caused a 42% increase in tissue MDA levels, P<0.001. Suppressing fatty acid oxidation with either oxfenicine or low flow ischemia caused no significant shifts in peroxide contents. Thus, the thiobarbituric acid method for MDA measurements is well adapted to analyzing frozen myocardium, and MDA levels appear sensitive to alterations in mechanical function and the presence of excess fatty acids.

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Author notes

  1. A. J. Liedtke M.D. (Professor of Medicine)

    Present address: Cardiology Section, University of Wisconsin Medica School, 600 Highland Avenue, H6/352, 53792, Madison, Wisconsin, USA

Authors and Affiliations

  1. Cardiology Section, University of Wisconsin Medica School, 600 Highland Avenue, H6/352, 53792, Madison, Wisconsin, USA

    C. Q. Mahar, K. Ytrehus & O. D. Mjøs

  2. Department of Physiology, Institute of Medical Biology, University of Tromsø, Tromsø, Norway

    A. J. Liedtke M.D. (Professor of Medicine), C. Q. Mahar, K. Ytrehus & O. D. Mjøs

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  1. A. J. Liedtke M.D.
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  2. C. Q. Mahar
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  3. K. Ytrehus
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  4. O. D. Mjøs
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Funded in part by USPHS Grant HL 21209 and the Rennebohm Foundation

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Liedtke, A.J., Mahar, C.Q., Ytrehus, K. et al. Estimates of free-radical production in rat and swine hearts: method and application of measuring malondialdehyde levels in fresh and frozen myocardium. Basic Res Cardiol 79, 513–518 (1984). https://doi.org/10.1007/BF01910480

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  • DOI: https://doi.org/10.1007/BF01910480

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