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Psoralen/UVA treatment and chromosomes

I. Aberrations and sister chromatid exchange in human lymphocytes in vitro and synergism with caffeine

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Summary

Treatment of human lymphocytes in vitro with trimethylpsoralen or 8-methoxypsoralen and UVA irradiation (PUVA) induced chromosome damage, mainly constrictions and gaps, but also breaks and exchanges, and increased the frequency of sister chromatid exchange (SCE). The localization of the chromosome aberrations was nonrandom. The coincidence of many PUVA hits with mercaptoenthanol hits suggests that PUVA may have other targets in the cell than the DNA, perhaps the folding proteins of the chromosomes and the nuclear membrane/chromatin attachment organelles.

Caffeine increased in a synergistic way the chromosome aberration yield if added after PUVA treatment, but there was no effect when caffeine was present before and during PUVA treatment. The SCE frequency was increased in the presence of caffeine.

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Authors and Affiliations

  1. Genetics Laboratory, Norsk Hydro's Institute for Cancer Research, Montebello, Oslo, Norway

    Helga Waksvik & Anton Brøgger

  2. Institute of Statistics, University of Copenhagen, Copenhagen, Denmark

    Jon Stene

Authors
  1. Helga Waksvik
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  2. Anton Brøgger
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  3. Jon Stene
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Waksvik, H., Brøgger, A. & Stene, J. Psoralen/UVA treatment and chromosomes. Hum Genet 38, 195–207 (1977). https://doi.org/10.1007/BF00527403

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  • DOI: https://doi.org/10.1007/BF00527403

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