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Role of antioxidant enzymes in cell immortalization and transformation

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Summary

The role of antioxidant enzymes, particularly superoxide dismutase (SOD), in immortalization and malignant transformation is discussed. SOD (generally MnSOD) has been found to be lowered in a wide variety of tumor types when compared to an appropriate normal cell control. Levels of immunoreactive MnSOD protein and mRNA for MnSOD also appear to be lowered in tumor cells. Tumor cells have the capacity to produce superoxide radical, the substrate for SOD. This suggests that superoxide production coupled with diminished amounts of MnSOD may be a general characteristic of tumor cells. The levels of MnSOD in certain cells correlates with their degree of differentiation; non-differentiating cells, whether normal or malignant, appear to have lost the ability to undergo MnSOD induction. These observations are used to elucidate a two-step model of cancer. This model involves not only the antioxidant enzymes, but also organelle (particularly mitochondria and peroxisomes) function as a dominant theme in carcinogenesis.

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Authors and Affiliations

  1. Radiation Research Laboratory, Department of Radiology, 14 Medical Laboratories, The University of Iowa, 52242, Iowa City, IA, USA

    Larry W. Oberley

  2. Pathology Service, William S. Middleton Veterans Memorial Hospital, 2500 Overlook Terrace, 53705, Madison, WI, USA

    Terry D. Oberley

Authors
  1. Larry W. Oberley
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  2. Terry D. Oberley
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Oberley, L.W., Oberley, T.D. Role of antioxidant enzymes in cell immortalization and transformation. Mol Cell Biochem 84, 147–153 (1988). https://doi.org/10.1007/BF00421049

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  • DOI: https://doi.org/10.1007/BF00421049

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