DNA Adduct of the Mitomycin C Metabolite 2,7-Diaminomitosene Is a Nontoxic and Nonmutagenic DNA Lesion in Vitro and in Vivo
| Autor: | Maria Tomasz, Arunangshu Das, Leilani A. Ramos, Cristina C. Clement, Ashis K. Basu, Christopher Utzat |
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| Rok vydání: | 2005 |
| Předmět: |
DNA polymerase
DNA damage Mitomycin Oligonucleotides DNA polymerase eta Toxicology Mitomycins DNA Adducts chemistry.chemical_compound DNA adduct Escherichia coli Animals Klenow fragment Molecular Structure biology Mutagenicity Tests Oligonucleotide DNA General Medicine Molecular biology Biochemistry chemistry COS Cells biology.protein Primer (molecular biology) DNA Damage |
| Zdroj: | Chemical Research in Toxicology. 18:213-223 |
| ISSN: | 1520-5010 0893-228X |
| DOI: | 10.1021/tx049813h |
| Popis: | Mitomycin C (MC) is a cytotoxic and mutagenic antitumor agent that alkylates and cross-links DNA. These effects are dependent on reductive bioactivation of MC. 2,7-Diaminomitosene (2,7-DAM) is the major metabolite of MC in tumor cells, generated by the reduction of MC. 2,7-DAM alkylates DNA in the cell in situ, forming an adduct at the N7 position of 2'-deoxyguanosine (2,7-DAM-dG-N7). To determine the biological effects of this adduct, we have synthesized an oligonucleotide containing a single 2,7-DAM-dG-N7 adduct and inserted it into an M13 bacteriophage genome. Replication of this construct in repair-competent Escherichia coli showed that the adduct was only weakly toxic and generated approximately 50% progeny as compared to control. No mutant was isolated after analysis of more than 4000 progeny phages from SOS-induced or uninduced host cells; therefore, we estimate that the mutation frequency of 2,7-DAM-dG-N7 was less than 2 x 10(-4) in E. coli. Subsequently, to determine if this adduct might be mutagenic in mammalian cells, it was incorporated into a single-stranded shuttle phagemid vector, pMS2, and replicated in simian kidney (COS-7) cells. Analysis of the progeny showed that mutational frequency of a site specific 2,7-DAM-dG-N7 was not higher than the spontaneous mutation frequency in simian kidney cells. In parallel experiments in cell free systems, template oligonucleotides containing a single 2,7-DAM-dG-N7 adduct directed selective incorporation of cytosine in the 5'-32P-labeled primer strands opposite the adducted guanine, catalyzed by Klenow (exo-) DNA polymerase. The adducted templates also supported full extension of primer strands by Klenow (exo-) and T7 (exo-) DNA polymerases and partial extension by DNA polymerase eta. The innocuous behavior of the 2,7-DAM-dG-N7 monoadduct in vivo and in vitro is in sharp contrast to that of the toxic MC-dG-N2 monoadduct reported earlier. |
| Databáze: | OpenAIRE |
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