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Differential effects of tumor necrosis factor and asbestos fibers on manganese superoxide dismutase induction and oxidant-induced cytotoxicity in human mesothelial cells

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Abstract

We compared induction of manganese superoxide dismutase (MnSOD) by asbestos fibers and tumor necrosis factor α (TNF) using cultures human mesothelial cells. Transformed pleural mesothelial cells (MET 5A) were exposed for 48 h to amosite asbestos fibers (2 μg/cm2), to TNF (10 Ng/ml), and to the combination of these two. TNF and amosite+TNF caused significant MnSOD mRNA upregulation. Similarly MnSOD specific activity was increased by TNF (290% increase) and the amosite+TNF combination (313% increase) but not by amosite alone. In cell injury experiments, amosite and amosite+TNF exposures caused significant cell membrane injury when assessed by lactate dehydrogenase release, which was 31% and 57% higher than in the unexposed cells. However, only the amosite+TNF combination caused significant depletion of cellular high-energy nucleotide when expressed as percentage of [14C]denine labeling in cellular high-energy nucleotides. The nucleotide levels were 91.5 ± 2.0% in the unexposed cells, 89.9 ± 3.9% in amosite-exposed cells, 90.1 ± 2.2% in TNF-exposed cells, and 79.8 ± 9.4% in amosite+TNF-exposed Amosite+TNF-exposed cells were also most sensitive to menadione (20 μmol/L, 2 h), a compound which generates superoxide radicals intracellularly. In conclusion, our data suggests that in human mesothelial cells inflammatory cytokines but not asbestos fibers alone can cause MnSOD induction. In this study, however amosite asbestos+TNF treatment rendered these cells more vulnerable to oxidant-induced cell damage despite elevated MnSOD activity.

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Abbreviations

MnSOD:

manganese superoxide dismutase

TNF:

tumor necrosis factor

LDH:

lactate dehydrogenase

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Authors and Affiliations

  1. Department of Internal Medicine, University of Helsinki, Helsinki

    P. Pietarinen-Runtti, A. Ekman & V. L. Kinnula

  2. Department of Pediatrics, University of Helsinki, Helsinki

    P. Pietarinen-Runtti, K. O. Raivio & M. Saksela

  3. Institute of Occupational Health, University of Helsinki, Helsinki

    K. Linnainmaa

  4. Department of Internal Medicine, University of Oulu, Finland

    V. L. Kinnula

Authors
  1. P. Pietarinen-Runtti
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  2. K. O. Raivio
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  3. K. Linnainmaa
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  4. A. Ekman
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  5. M. Saksela
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  6. V. L. Kinnula
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Pietarinen-Runtti, P., Raivio, K.O., Linnainmaa, K. et al. Differential effects of tumor necrosis factor and asbestos fibers on manganese superoxide dismutase induction and oxidant-induced cytotoxicity in human mesothelial cells. Cell Biol Toxicol 12, 167–175 (1996). https://doi.org/10.1007/BF00148170

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