Abstract
We have measured the baseline level of gelatinase in fibroblast-conditioned medium from 41 Scandinavian individuals. They comprised 12 healthy persons, 11 individuals with the skin disorder dominant epidermolysis bullosa simplex (DEBS), 16 patients with other types of epidermolysis bullosa (EB) and 2 siblings with prolidase deficiency. These results divide the cell strains into those with low and those with high activity levels. Although this dual biochemical trait occurred in all the groups of individuals, the high-activity trait was more frequent among the DEBS patients. The localized DEBS forms showed an elevated activity level, in contrast to the previously reported generalized DEBS Köbner forms. Although a high level was found in some individuals with other EB forms, the high incidence in four families with localized DEBS Weber-Cockayne (eight of eight) and a single family with generalized DEBS—mottled pigmentation (two of two) may result from a close linkage between an EB gene and a gene responsible for the biochemical trait. In addition, in the single complete family tested, the level of gelatinase activity in cultured fibroblasts seemed to be regulated by codominant alleles or genes. A raised baseline level of gelatinase activity in cultured skin fibroblasts may be the result of either an altered expression of gelatinase or an allelic variant of this enzyme with increased specific activity. Further studies of gelatinase in cultured fibroblasts may provide insight into the regulatory mechanism and genetics behind this activity and allow formal linkage studies versus DEBS.
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This work was supported in part by the Norwegian Research Council for Science and the Humanities (NAVF) and the Concerted Action on Hereditary Connective Tissue Diseases of the European Community (1990–1992, project leader, M. Matton).
Part of this work was performed at the Department of Genetics, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo.
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Winberg, JO., Gedde-Dahl, T. Epidermolysis bullosa simplex: Expression of gelatinase activity in cultured human skin fibroblasts. Biochem Genet 30, 401–420 (1992). https://doi.org/10.1007/BF00569330
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DOI: https://doi.org/10.1007/BF00569330