title: Dinuclear complexes of platinum having anticancer properties. DNA-binding studies and biological activity of bis(4,4'-dipyrazolylmethane-N,N')- bis[dichloroplatinum(II)] and related complexes.
abstract: Some DNA-binding experiments employing a selected number of novel dinuclear platinum complexes with the 4,4'-dipyrazolylmethane (dpzm) ligand are reported. A DNA-cleavage assay using Eco RI and Bam HI restriction endonucleases to probe the binding of the complexes at or near their unique restriction sequences of pUC9 DNA has been examined. The complex beta-[Cl2Pt(dpzm)2PtCl2] has a greater affinity for DNA at the Eco RI restriction sequence over the Bam HI site. To our knowledge, the preferential inhibition of Eco RI activity is unprecedented for any platinum species reported to date. Further, the dinuclear complexes beta-[Cl2Pt(dpzm)2PtCl2], beta-[Cl4Pt(dpzm)2PtCl4] x 0.5dmf x 0.5H2O and [Cl4Pt(dpzm)2PtCl2] are capable of inhibiting Eco RI activity to a far greater extent than the platinum anticancer drug cis-[PtCl2(NH3)2] (cisplatin). The in vivo and in vitro anticancer properties of some of the platinum complexes are also described. The complexes alpha-[Cl2Pt(dpzm)2PtCl2] x 0.5dmf and beta-[Cl2Pt(dpzm)2PtCl2] display significant activity against P388 lymphocytic leukemia in mice.
authors.affiliation: Department of Chemistry, Faculty of Science, Australian National University, Canberra.
authors.forename: J A
authors.initials: JA
authors.lastname: Broomhead
authors.forename: L M
authors.initials: LM
authors.lastname: Rendina
authors.forename: L K
authors.initials: LK
authors.lastname: Webster
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000378:metabolism* / Q000494:pharmacology / Q000627:therapeutic use; D004247:DNA / Q000378:metabolism*; D015245:Deoxyribonuclease BamHI / Q000378:metabolism; D015246:Deoxyribonuclease EcoRI / Q000378:metabolism; D007939:Leukemia L1210 / Q000188:drug therapy; D007941:Leukemia P388 / Q000188:drug therapy; D008546:Melanoma, Experimental / Q000188:drug therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D009944:Organoplatinum Compounds / Q000378:metabolism* / Q000494:pharmacology / Q000627:therapeutic use; D010957:Plasmids
chemical_list: D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; C079690:bis(4,4'-dipyrazolylmethane-N,N')-bis(dichloroplatinum II); D004247:DNA; D015245:Deoxyribonuclease BamHI; D015246:Deoxyribonuclease EcoRI