Learn More
We have previously reported the development of a two-column high performance liquid chromatography system for separation of platinum(II) complexes with the 1,2-diaminocyclohexane (DACH) carrier ligand (Mauldin et al., Anal. Biochem., 157: 129, 1986). Here we report the application of this technique to the study of the intracellular biotransformations of(More)
Tetrachloro(D,L-trans)1,2-diaminocyclohexaneplatinum(IV) (tetraplatin) is a new platinum analogue which is less nephrotoxic than cisplatin and is effective in some cell lines which have become resistant to cisplatin. Since platinum(IV) compounds are thought to require reduction to their platinum(II) analogues for activity, the biotransformations of(More)
L1210 cell lines have been described that are sensitive to most platinum compounds (L1210/0), resistant to ethylenediamine (en)-Pt but sensitive to diaminocyclohexane (dach)-Pt (L1210/DDP), and resistant to dach-Pt but sensitive to en-Pt (L1210/DACH). We have examined the effect of the dach and en carrier ligands on the ability of Pt-DNA adducts to inhibit(More)
Tetrachloro(d,l-trans)-1,2-diaminocyclohexaneplatinum(IV) (tetraplatin) has been considered a prodrug which would be converted rapidly to dichloro(d,l-trans)-1,2-diaminocyclohexaneplatinum(II) [PtCl2(dach)] under physiological conditions. However, the biotransformations of tetraplatin have not been studied in detail. We have followed the intracellular(More)
We have examined the effect of carrier ligands on platinum accumulation, incorporation of platinum into DNA, cytotoxicity of Pt-DNA adducts, and repair of Pt-DNA adducts in three L1210 cell lines: L1210/0, which is sensitive to most types of platinum compounds; L1210/DDP, which is resistant to platinum compounds with the ethylenediamine (en) carrier ligand(More)
Thiourea and NH4HCO3 are widely used to block the conversion of Pt-DNA monoadducts to diadducts prior to the enzymatic digestion of DNA and subsequent analysis of the relative proportion of the different types of Pt-DNA adducts. Our data show that NH4HCO3 (100 mM, 18 h, 25°C) is much less effective than thiourea (10 mM, 10 min, 25°C) at blocking(More)
  • 1