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The mutagenic effect of ultraviolet-A1 on human skin demonstrated by sequencing the p53 gene in single keratinocytes.
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2002 (English)In: Photodermatology, Photoimmunology & Photomedicine, ISSN 0905-4383, E-ISSN 1600-0781, Vol. 18, no 6Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Sun exposure is accepted as the major risk factor for developing skin cancer, the most common cancer in the western world. Ultraviolet-B (UV-B) radiation is considered the causative agent, but recently several findings suggest a role also for ultraviolet-A (UV-A) radiation. Repeated suberythemal doses of ultraviolet-A1 (UV-A1) on healthy human skin induce an increase of p53 immunoreactive cells in epidermis, which may indicate cell cycle arrest and/or occurrence of p53 mutations.

METHODS: We have investigated the possible mutagenic effect of UV-A1 on skin by sequencing exons 4-11 and adjacent intron sequence of the p53 gene in immunoreactive single cells from three healthy individuals. Previously unexposed buttock skin was irradiated three times a week for 2 weeks with physiological fluences (40 J/cm2) of UV-A1. Punch biopsies were taken before and at different time-points after the exposure, and from these single p53 immunoreactive cells were isolated by using laser-assisted microdissection.

RESULTS: Three mutations--all being indicative of oxidative damage and most likely related to UV-A exposure--were found among the 37 single cells from exposed skin, whereas no mutations were found in the 22 single cells taken before exposure.

CONCLUSIONS: The findings indicate a mutagenic effect of low-dose UV-A1 on healthy human skin, which further demonstrates the importance of considering UV-A when taking protective measures against skin cancer.

Place, publisher, year, edition, pages
2002. Vol. 18, no 6
National Category
Cell and Molecular Biology
URN: urn:nbn:se:kth:diva-197595PubMedID: 12535024OAI: diva2:1052147

QC 20161206

Available from: 2016-12-05 Created: 2016-12-05 Last updated: 2016-12-06Bibliographically approved

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