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Defects in antioxidant defense and calcium transport in the epidermis of xeroderma pigmentosum patients

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Summary

A comparative study of the antioxidant enzymes superoxide dismutase, catalase, glutathione reductase and thioredoxin reductase was undertaken in two families with xeroderma pigmentosum (XP) and in healthy controls of corresponding skin phototypes. Epidermal blister roofs obtained from the XP patients revealed significant decreases in catalase, thioredoxin reductase, and superoxide dismutase, but glutathione reductase was unaffected. In addition, keratinocytes established from XP patients contained a significantly higher than normal intracellular calcium concentration compared with control cells from a corresponding skin type. Keratinocytes established from an XP obligate heterozygote revealed intermediate levels of calcium between XP homozygotes and controls. Previously high intracellular calcium has been shown to compromise the redox status of keratinocytes by allosteric inhibition of the thioredoxin reductase/thioredoxin electron transfer system. In XP homozygous keratinocytes from sun-exposed epidermis, the intracellular concentration of reduced thioredoxin was decreased to 50% compared with these cells from unexposed skin. Taken together, the results from this study indicate that the epidermis in XP patients lacks effective defense against free radicals and peroxides. In addition to the well-established defect in the normal rates of unscheduled DNA repair, these findings provide an even better explanation for the multiple cutaneous neoplasms in these patients.

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Authors and Affiliations

  1. Department of Dermatology, University of Hamburg, Martinistrasse 52, W-2000, Hamburg 20, Germany

    K. U. Schallreuter

  2. Department of Dermatology, Mayo Clinic, Rochester, Minn., USA

    M. R. Pittelkow

  3. Department of Biochemistry, University of Minnesota, St. Paul, Minn., USA

    J. M. Wood

Authors
  1. K. U. Schallreuter
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  2. M. R. Pittelkow
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  3. J. M. Wood
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Schallreuter, K.U., Pittelkow, M.R. & Wood, J.M. Defects in antioxidant defense and calcium transport in the epidermis of xeroderma pigmentosum patients. Arch Dermatol Res 283, 449–455 (1991). https://doi.org/10.1007/BF00371781

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  • DOI: https://doi.org/10.1007/BF00371781

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