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Free radical damage to cultured porcine aortic endothelial cells and lung fibroblasts: Modulation by culture conditions

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Summary

Culture conditions modulating cell damage from xanthine plus xanthine oxidase-derived partially reduced oxygen species were studied. Porcine thoracic aorta endothelial cells and porcine lung fibroblasts were maintained in monolayer culture. Cells were prelabeled with51Cr before xanthine plus xanthine oxidase exposure. Endothelial cells showed 30 to 100% more lysis than fibroblasts and thus seemed more sensitive to this oxidant stress. The effect of cell culture age, as indicated by population doubling level (PDL), was examined. Response of low PDL endothelial cells and fibroblasts subjected to oxidant stress was compared with the response of PDL 15 cells. Both low PDL endothelial cells and fibroblasts responded differently to the lytic effect of xanthine oxidase-derived free radicals than did higher PDL cells. Specific activities of the antioxidant enzymes catalase, managanese superoxide dismutase, copper-zinc superoxide dismutase, glutathione peroxidase, and glucose-6-phosphate dehydrogenase were measured in both low and high PDL fibroblasts and endothelial cells. Antioxidant enzyme specific activities could only partially explain the differences in response to oxidant stress between fibroblasts and endothelial cells and between low and high PDL cells. Cell culture medium composition modulated the rate of production, and relative proportions of xanthine plus xanthine oxidase-derived partially reduced species of oxygen, i.e. superoxide, hydrogen peroxide, and hydroxyl radical. Serum content of medium was important in modulating free radical generation; superoxide production rates decreased 32%, H2O2 became undetectable, and hydroxyl radical generation decreased 54% in the presence of 10% serum. The medium protein and iron content also modulated free radical generation. The data suggest that cell culture media constituents, cell type, and cell culture age greatly affect in vitro response of cells subjected to oxidant stress.

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Authors and Affiliations

  1. Division of Allergy, Critical Care, and Respiratory Diseases, Duke University Medical Center, 27710, Durham, North Carolina

    Clark T. Bishop, Zermeena Mirza, James D. Crapo & Bruce A. Freeman

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  1. Clark T. Bishop
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  2. Zermeena Mirza
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  3. James D. Crapo
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  4. Bruce A. Freeman
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Additional information

Research supported by American Lung Association Fellowship Training Grant and Research Training Grant, the R. J. Reynolds Corporation, and National Institutes of Health Grants HL29784 and 1 HL 23805.

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Bishop, C.T., Mirza, Z., Crapo, J.D. et al. Free radical damage to cultured porcine aortic endothelial cells and lung fibroblasts: Modulation by culture conditions. In Vitro Cell Dev Biol 21, 229–236 (1985). https://doi.org/10.1007/BF02620934

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  • DOI: https://doi.org/10.1007/BF02620934

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