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Carcinogenesis |
Department of Dermatology, University Medical Center Utrecht, 3508 GA Utrecht [R. J. W. B., H. R., W. A. V. V., F. R. d. G.]; MGC-Department of Cell Biology and Genetics, Erasmus University Rotterdam, 3000 DR Rotterdam [G. T. J. v. d. H.]; Laboratory of Health Effects Research, National Institute of Public Health and the Environment, 3720 BA Bilthoven [H. J. v. K.]; and MGC-Department of Radiation Genetics and Chemical Mutagenesis, Leiden University, 2300 RA Leiden [L. H. F. M.], the Netherlands
The nucleotide excision repair (NER) system is comprised of two
subpathways, i.e., transcription-coupled repair (TCR)
and global genome repair (GGR). To establish the relative importance of
TCR and GGR for UV effects on the skin, we have used hairless knockout
mouse strains lacking either TCR (CSB -/-) or GGR
(XPC -/-). In single exposure experiments, we found
that CSB -/- mice have a 716 times higher
susceptibility to sunburn than XPC -/- mice and than
heterozygous (+/-) and wild-type (+/+) controls. Exposure to 80
J/m2 UV radiation (i.e., suberythemogenic in
CSB -/-) on 10 consecutive days gives rise to
epidermal hyperplasia in CSB -/- and XPC
-/-, whereas repair-proficient controls do not show epidermal
hyperplasia from these exposures. In addition, CSB -/-
mice develop marked parakeratosis, whereas XPC -/-
mice and controls do not. Under continued exposure to this daily dose,
squamous cell carcinomas appear in CSB -/-, XPC
-/-, and in the control groups, whereas only in the
CSB -/- animals is a fairly high number of benign
papillomas also found. The median latency time of squamous cell
carcinomas (diameters
1 mm) is 84 days for the XPC
-/- mice, 115 days for the CSB -/- mice, and
234238 days for the heterozygous and wild-type control groups. These
results indicate that GGR is more important than TCR in protection
against UV-induced carcinomas of the skin but not against other UV
effects such as sunburn, epidermal thickening, scaling of the stratum
corneum, and development of papillomas. These results also indicate
that GGR capacity may serve as a better predictor for skin cancer
susceptibility than sensitivity to sunburn. The relative cancer
susceptibilities of GGR- and TCR-deficient skin could well depend on
the balance between an increased mutation rate and the presence (in
CSB -/-) or lack (in XPC -/-) of a
compensatory apoptotic response.
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