title: Structural characterization, DNA interactions, and cytotoxicity of new transplatin analogues containing one aliphatic and one planar heterocyclic amine ligand.
abstract: We report in the present work new analogues of clinically ineffective transplatin in which one ammine group was replaced by aliphatic and the other by a planar heterocyclic ligand, namely trans-[PtCl(2)(isopropylamine)(3-(hydroxymethyl)-pyridine)], 1, and trans-[PtCl(2)(isopropylamine)(4-(hydroxymethyl)-pyridine)], 2. The new compounds, in comparison with parent transplatin, exhibit radically enhanced activity in tumor cell lines both sensitive and in particular resistant to cisplatin. Concomitantly, the DNA binding mode of 1 and 2 compared to parent transplatin and other antitumor analogues of transplatin in which only one ammine group was replaced is also different. The results also suggest that the reactions of glutathione and metallothionein-2 with compounds 1 and 2 do not play a crucial role in their overall biological effects. In addition, the monofunctional adducts of 1 and 2 are quenched by glutathione considerably less than the adducts of transplatin, which may potentiate cytotoxic effects of these new platinum complexes.
authors.affiliation: Institute of Biophysics, Academy of Sciences of the Czech Republic, CZ-61265 Brno, Czech Republic.
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Ramos-Lima
authors.forename: Oldrich
authors.initials: O
authors.lastname: Vrána
authors.forename: Adoración G
authors.initials: AG
authors.lastname: Quiroga
authors.forename: Carmen
authors.initials: C
authors.lastname: Navarro-Ranninger
authors.forename: Anna
authors.initials: A
authors.lastname: Halámiková
authors.forename: Hana
authors.initials: H
authors.lastname: Rybnícková
authors.forename: Lenka
authors.initials: L
authors.lastname: Hejmalová
authors.forename: Viktor
authors.initials: V
authors.lastname: Brabec
mesh_terms: D000588:Amines / Q000737:chemistry*; D001483:Base Sequence; D001665:Binding Sites; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002942:Circular Dichroism; D002945:Cisplatin / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry / Q000187:drug effects*; D004354:Drug Screening Assays, Antitumor; D006573:Heterocyclic Compounds, 1-Ring / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D013329:Structure-Activity Relationship; D013890:Thiourea / Q000737:chemistry
chemical_list: D000588:Amines; D006573:Heterocyclic Compounds, 1-Ring; D008024:Ligands; C034697:transplatin; D004247:DNA; D013890:Thiourea; D002945:Cisplatin