Chromosomal damage induced by furocoumarins and UVA in hamster and human cells including cells from patients with ataxia telangiectasia and xeroderma pigmentosum |
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Authors: | AT Natarajan Elly AM Verdegaal-Immerzeel MJ Ashwood-Smith GA Poulton |
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Institution: | 1. Department of Radiation Genetics and Chemical Mutagenesis, State University of Leiden, Wassenaarseweg 72, 2333 AL Leiden, The Netherlands;2. J.A. Cohen Institute, Interuniversity Institute of Radiopathology and Radiation Protection, LeidenThe Netherlands;3. Department of Biology, Environmental Toxicology Research Group, University of Victoria, P.O. Box 1700, Victoria, BCCanada |
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Abstract: | The comparative photosensitizing effects to near-UV irradiation (UVA) of several naturally occurring furocoumarins, 5-methoxypsoralen (5MOP), psoralen, 8-methoxypsoralen (8MOP) and angelicin in producing chromosome damage in vitro in cells derived from hamster, normal human, ataxia telangiectasia (AT) and xeroderma pigmentosum (XP) patients were studied. In Chinese hamster cells, lethality was greatest with psoralen and least with angelicin; 8MOP and 5MOP were intermediate. 8MOP and 5MOP produced sister-chromatid exchanges with almost equal efficiency and to a larger extent by far than angelicin. In all human cell lines studied 8MOP and 5MOP were similarly effective in the production of sister-chromatid exchanges and chromosomal aberrations. AT and XP cells responded with higher frequencies of sister-chromatid exchanges as well as chromosomal aberrations than normal human cells to 5MOP, 8MOP and angelicin. Evidence is presented which suggests that cell death in Chinese hamster cells following angelicin photosensitization is not clearly related to the production of sister-chromatid exchanges. AT cells were unexpectedly more sensitive to angelicin than normal cells. The presence of 5MOP in some sun-tan preparations is not acceptable in view of the present evidence of its biological activity. |
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Keywords: | A angelicin AT ataxia telangiectasia 5MOP 5-methoxypsoralen 8MOP 8-methoxypsoralen P psoralen PUVA psoralen and long-wave UV SCE sister-chromatid exchanges UVA near-UV irradiation XP xeroderma pigmentosum |
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