Two rabbits were immunized with native DNA modified in vitro by cis-dichlorodiammineplatinum(II) (cis-Pt). The interactions between the antiserum and several natural and synthetic nucleic acids were studied primarily by radioimmunoassays. Native DNA's modified by platinum compounds with labile groups in the cis position are recognized by the antiserum. No cross-reaction is found with native DNA...

The optical properties of the DNA complexes with divalent platinum compounds of the cis-diamine type differing both in the nature of anionic and neutral ligands and in the spatial arrangement about the platinum atom were studied. The platinum compounds cis-[Pt(NH3)2Cl2], [Pt(en)Cl2], [Pt(tetrameen)Cl2], cis-[Pt(NH3)2NO2Cl], and cis-[PtNH3(Bz)Cl2] at small values of r (r is the molar ratio of a ...

Previous studies have investigated the cytotoxicity of platinum(II) compounds with bidentate leaving ligands, but little is known about their uptake or mechanism of action inside the cell. We have compared the uptake and intracellular effects of cis-1,2-diaminocyclohexanemalonatoplatinum(II) [Pt(mal)(cis-DACH)] and cis-1,2-diaminocyclohexanedichloroplatinum(II) [PtCl2(cis-DACH)] in the L1210 ce...

Cisplatin (cis-Pt) resistance in tumor cells from p53 dysfunction is a significant clinical problem. Although mutation can inhibit p53 function, >60% of p53 mutants retain normal function according to literature reports. Therefore, we examined the status of p53 in cisplatin-resistant ovarian tumor models and its functional response to cis-Pt and the mechanistically-distinct non-cross-resistant ...

DNA interstrand cross-linking had been found previously to correlate with differences in sensitivity among human cell strains treated with chloroethylnitrosoureas. These differences had been attributed to the presence or absence of a specific DNA repair mechanism. The current work addressed the question of whether another DNA cross-linking agent, cis-diamminedichloroplatinum(II) (cis-Pt), would...

We have studied the cytotoxicity and DNA cross-linking induced by cis-diamminedichloroplatinum(II) (cis-Pt) in a normal, a simian virus 40-transformed, and eight tumor cell lines of human origin. These cell strains were chosen on the basis of their Mer phenotype, i.e., their ability to repair DNA containing 6O-alkylated guanine. The cytotoxicity was assayed by measuring the inhibition of cell p...

Three platinum complexes with cis and trans configuration cis-[Pt(TCEP)2Cl2], cis-[Pt(tmTCEP)2Cl2] and trans-[Pt(TCEP)2Cl2], where TCEP is tris(2-carboxyethyl)phosphine, have been synthesized and fully characterized by usual techniques including single-crystal X-ray diffraction for trans-[Pt(TCEP)2Cl2] and cis-[Pt(tmTCEP)2Cl2]. Here, we also report on an esterification process of TCEP, which ta...

The series of complexes: cis-[Pd(PMSA)2X2], cis-[Pt(PMSA)2X2], trans-[Pt(PMSA)2I2] and [Pt(PMSA)4]Cl2 (PMSA = N-3-pyridinylmethanesulfonamide; X = Cl, Br, I), previously synthesized and characterized by us, as well as the free ligand PMSA, were tested for their cytotoxic activity without electroporation -- against murine leukemia F4N and human SKW-3 and MDA-MB-231 tumour cell lines -- and with ...

Rabbit antiserum elicited against calf thymus DNA modified to 4.4% (Pt drug/nucleotide ratio = 0.044) with the antitumor drug cis-diamminedichloroplatinum(II) (cis-DDP) contains antibodies specific for the Pt-modified DNA immunogen as well as for Pt-DNA adducts formed in both cultured mouse leukemia L1210 cells and in L1210 cells from the ascites fluid of tumor-bearing mice exposed to cis-DDP. ...