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Molecular Biology and Genetics |
Division of Applied Toxicology, Institute of Toxicology, University of Mainz, D-55131 Mainz, Germany [K. O., B. K.]; and Laboratory of Structural Biology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709-2233 [R. W. S., S. H. W.]
DNA polymerase ß (ß-pol), which is involved in base excision repair, was investigated for its role in protection of cells against various genotoxic agents and cytostatic drugs using ß-pol knockout mouse fibroblasts. We show that cells lacking ß-pol are highly sensitive to induction of apoptosis and chromosomal breakage by methylating agents, such as N-methyl-N'-nitro-N-nitrosoguanidine and methyl methanesulfonate and the cross-linking antineoplastic drugs mitomycin C and mafosfamide. The cross-sensitivity between the agents observed suggests that ß-pol is involved in repair not only of DNA methylation lesions but also of other kinds of DNA damage induced by various cytostatic drugs. Cells deficient in ß-pol were not hypersensitive to cisplatin, melphalan, benzo(a)pyrene diol epoxide, chloroethylnitrosourea, or UV light. Because both established and primary ß-pol knockout fibroblasts displayed the hypersensitive phenotype, which, moreover, was complemented by transfection with a ß-pol expression vector, the alkylating agent hypersensitivity can clearly be attributed to the ß-pol deficiency. The results demonstrate that ß-pol-driven base excision repair is highly important for protection of cells against cell killing due to apoptosis and induced chromosomal breakage and suggest that incompletely repaired DNA damage causes chromosomal changes and may act as a trigger of DNA damage-induced apoptosis.
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