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. 1995 Oct 25;23(20):4066–4072. doi: 10.1093/nar/23.20.4066

Mutagenic and genotoxic effects of DNA adducts formed by the anticancer drug cis-diamminedichloroplatinum(II).

K J Yarema 1, S J Lippard 1, J M Essigmann 1
PMCID: PMC307344  PMID: 7479066

Abstract

The toxicity and mutagenicity of three DNA adducts formed by the anticancer drug cis-diamminedichloroplatinum(II) (cis-DDP or cisplatin) were investigated in Escherichia coli. The adducts studied were cis-[Pt(NH3)2(d(GpG))] (G*G*), cis-[Pt(NH3)2(d(ApG))] (A*G*) and cis-[Pt(NH3)2(d(GpTpG))] (G*TG*), which collectively represent approximately 95% of the DNA adducts reported to form when the drug damages DNA. Oligonucleotide 24-mers containing each adduct were positioned at a known site within the viral strand of single stranded M13mp7L2 bacteriophage DNA. Following transfection into E. coli DL7 cells, the genomes containing the G*G*, A*G* and G*TG* adducts had survival levels of 5.2 +/- 1.2, 22 +/- 2.6 and 14 +/- 2.5% respectively, compared to unmodified genomes. Upon SOS induction, the survival of genomes containing the G*G* and A*G* adducts increased to 31 +/- 5.4 and 32 +/- 4.9% respectively. Survival of the genome containing the G*TG* adduct did not increase upon SOS induction. In SOS induced cells, the G*G* and A*G* adducts gave rise predominantly to G-->T and A-->T transversions respectively, targeted to the 5' modified base. In addition, A-->G transitions were detected for the A*G* adduct and low levels of tandem mutations at the 5' modified base as well as the adjacent 5' base were also observed for both adducts. The A*G* adduct was more mutagenic than the G*G* adduct, with a mutation frequency of 6% compared to 1.4% for the latter adduct. No cis-[Pt(NH3)2)2+ intrastrand crosslink-specific mutations were observed for the G*TG* adduct.

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Selected References

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