CHROMOSOME DAMAGE AND DNA REPAIR INDUCED IN HUMAN FIBROBLASTS BY UV AND CHOLESTEROL OXIDE

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Abstract
In human fibroblasts, cholesterol oxide inclined a similar degree of chromosome damage (8.6% of metaphases) and DNA repair synthesis (8-10% of cells with tightly-labelled nuclei) as low doses of ultraviolet light (UV), but did not produce single-strand DNA breaks or DNA damage detectable by Inhibition of thymidine incorporation. Chromosome aberrations were detected up to 8 weeks after treatment with cholesterol oxide and UV. Combined treatments bad almost additive elicits on the frequency of chromosome aberrations lint not on repair synthesis. Multiple daily doses of IV did not cause more aberrations than a single dose. Attempts to transform two fibroblast strains from normal donors and three derived From melanoma patients using single and combined treatments of UV, cholesterol oxide and hyperthermia (40°) were unsuccessful.