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J Invest Dermatol. 1996 Apr;106(4):721-8.

Cell survival and shuttle vector mutagenesis induced by ultraviolet A and ultraviolet B radiation in a human cell line.

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  • 1Laboratory of Molecular Genetics, Institut de Recherches sur le Cancer, Villejuif, France.


Although it is known that sunlight is carcinogenic,few molecular data are available concerning the mutagenic effects of ultraviolet (UV) B (290-320 nm) and UVA (320-400 nm) radiation in human cells. To analyze the biologic effects of UVA and UVB, we irradiated the 293 human cell line, derived from adenovirus-transformed human embryonic kidney cells, in which we had stably introduced a shuttle vector harboring the lacZ' bacterial gene as the mutagenesis target. Identical cell survival occurred after UVA doses 700-fold higher than UVB. This comparable to the UVA/UVB ratio that reaches the basal cell layer of the skin after sunlight exposure with UVB sunscreen. The frequency of UVA- and UVB- induced mutations increased with the UV dose as cell survival decreased. At cell survival levels greater than 10%, UVA and UVB induced similar frequencies of mutations in the episomal lacZ gene, whereas for cell survival lower than 10%, UVA induced twice as many mutations as UVB. Sequence analysis of 81 independent lacZ mutants (36 UVA- and 45 UVB-induced) revealed specific characteristics for some UV-induced-mutations, particularly for UVB. Mutations at A/T base pairs were induced more frequently by UVA than by UVB. The UVA-induced mutation spectrum that we have observed in human cells may help help to elucidate the mechanism of skin carcinogenesis.

[PubMed - indexed for MEDLINE]
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