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. 1992 Dec 11;20(23):6363–6368. doi: 10.1093/nar/20.23.6363

Repair synthesis by human cell extracts in cisplatin-damaged DNA is preferentially determined by minor adducts.

P Calsou 1, P Frit 1, B Salles 1
PMCID: PMC334528  PMID: 1475197

Abstract

During reaction of cis-diamminedichloroplatinum(II) (cis-DDP) with DNA, a number of adducts are formed which may be discriminated by the excision-repair system. An in vitro excision-repair assay with human cell-free extracts has been used to assess the relative repair extent of monofunctional adducts, intrastrand and interstrand cross-links of cis-DDP on plasmid DNA. Preferential removal of cis-DDP 1,2-intrastrand diadducts occurred in the presence of cyanide ions. In conditions where cyanide treatment removed 85% of total platinum adducts while approximately 70% of interstrand cross-links remained in plasmid DNA, no significant variation in repair synthesis by human cell extracts was observed. Then, we constructed three types of plasmid DNA substrates containing mainly either monoadducts, 1,2-intrastrand cross-links or interstrand cross-links lesions. The three plasmid species were modified in order to obtain the same extent of total platinum DNA adducts per plasmid. No DNA repair synthesis was detected with monofunctional adducts during incubation with human whole cell extracts. However, a two-fold increase in repair synthesis was found when the proportion of interstrand cross-links in plasmid DNA was increased by 2-3 fold. These findings suggest that (i) cis-DDP 1,2-intrastrand diadducts are poorly repaired by human cell extracts in vitro, (ii) among other minor lesions potentially cyanide-resistant, cis-DDP interstrand cross-links represent a major lesion contributing to the repair synthesis signal in the in vitro assay. These results could account for the drug efficiency in vivo.

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Selected References

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