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. 1993 Jun;67(6):1285–1292. doi: 10.1038/bjc.1993.239

A new anticancer platinum compound, (-)-(R)-2-aminomethyl-pyrrolidine(1,1-cyclobutanedicarboxylato) platinum(II): DNA interstrand crosslinking, repair and lethal effects in normal human, Fanconi's anaemia and xeroderma pigmentosum cells.

Y Fujiwara 1, M Nakamura 1, S Yokoo 1
PMCID: PMC1968491  PMID: 8512813

Abstract

Interstrand cross-linking, repair and lethal effects of (-)-(R)-2-aminomethylpyrrolidine(1,1-cyclobutanedicarboxylato++ +) platinum(II) (DWA2114R) were studied in normal human. Fanconi's anaemia (FA) and xeroderma pigmentosum group A (XPA) cells. Interstrand crosslinking by DWA2114R was slower than that by cisplatin (CDDP), since DWA2114R produced mainly Pt(II)-monoadducts after 1 h treatment, followed by progressive interstrand crosslinking to a maximum 5 h post-incubation, while CDDP induced rapidly interstrand crosslinks in approximately 70% DNA during the 1 h treatment, followed by a approximately 30% residual increase. At the maximum rate, DWA2114R was 18 times less interstrand-crosslinking than CDDP on the 1 mM basis. FA cells were specifically defective in the first half-excision of DWA2114R and CDDP-induced Pt(II) interstrand crosslinks, but XPA cells were as proficient as normal cells (t1/2 = 5-7 h). On the contrary, XPA cells were deficient in excision repair of intrastrand crosslinks, but FA cells were normal. In clonogenic survival curves of all types of cells, mean lethal doses (Do) of DWA2114R were an order of magnitude greater than those of CDDP. FA cells were most (3.5 times) sensitive (Do = 25.1 +/- 0.96 microM) and XPA cells were 1.9 times more sensitive (Do = 47.1 +/- 0.17 microM) to DWA2114R than normal cells (Do = 87.6 +/- 5.65 microM). DWA2114R and carboplatin with a cyclobutanedicarboxylato group exhibited almost similar lethal effects on each of normal, FA and XPA strains. FA (Do = 3.44 +/- 0.44 microM) and XPA cells (Do = 3.84 +/- 0.17 microM) were similarly 3-fold more sensitive to CDDP than normal (Do = 9.97 +/- 0.15 microM). On the basis of a single lethal hit (Do), thus DWA2114R and carboplatin effectively killed more FA cells defective in interstrand crosslink repair than XPA cells defective in intrastrand crosslink repair.

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Selected References

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