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. 1997 Apr;150(4):1457–1464.

Differentiation-dependent p53 regulation of nucleotide excision repair in keratinocytes.

G Li 1, V C Ho 1, D L Mitchell 1, M J Trotter 1, V A Tron 1
PMCID: PMC1858179  PMID: 9095000

Abstract

The role of the tumor suppressor p53 in repair of ultraviolet light (UV)-induced DNA damage was evaluated using a host-cell reactivation (HCR) assay. HCR determines a cell's ability to repair UV-damaged DNA through reactivation of a transfected CAT reported plasmid. Most UV damage is removed through nucleotide excision repair (NER). Primary murine keratinocytes isolated from p53-deficient and wild-type p53 mice were used in the HCR assay. The NER was reduced in p53-/- keratinocytes as compared with p53+/+ keratinocytes. The reduced DNA repair in p53-/- mice was confirmed with a radioimmunoassay comparing cyclobutane dimers (CPDs) and (6-4) photoproducts in p53+/+ and p53-/- keratinocytes after the cells were exposed to UV irradiation. Our results demonstrate that wildtype p53 plays a significant role in regulating NER. Furthermore, as there is evidence that p53 protein levels decrease after keratinocytes become differentiated, we sought to determine whether p53 plays a role in NER in differentiated keratinocytes. Differentiation of the keratinocytes by increasing the Ca2+ concentration in the culture media resulted in a marked reduction in NER equally in both p53+/+ and p53-/- groups. This finding suggests that reduced DNA repair after differentiation is p53 independent. A similar reduction in HCR was confirmed in differentiated human keratinocytes. These data, taken together, indicate that p53 or p53-regulated proteins enhance NER in basal undifferentiated keratinocytes but not in differentiated cells. As nonmelanoma skin cancers originate from the basal keratinocytes, our findings suggest that loss of p53 may contribute to the pathogenesis of this common skin cancer.

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Selected References

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