title: Conformation and recognition of DNA modified by a new antitumor dinuclear PtII complex resistant to decomposition by sulfur nucleophiles.
abstract: Reported herein is a detailed biochemical and molecular biophysics study of the molecular mechanism of action of antitumor dinuclear Pt(II) complex [{PtCl(DACH)}(2)-mu-Y](4+) [DACH=1,2-diaminocyclohexane, Y=H(2)N(CH(2))(6)NH(2)(CH(2))(2)NH(2)(CH(2))(6)NH(2)] (complex 1). This new, long-chain bifunctional dinuclear Pt(II) complex is resistant to metabolic decomposition by sulfur-containing nucleophiles. The results show that DNA adducts of 1 can largely escape repair and yet inhibit very effectively transcription so that they should persist longer than those of conventional cisplatin. Hence, they could trigger a number of downstream cellular effects different from those triggered in cancer cells by DNA adducts of cisplatin. This might lead to the therapeutic effects that could radically improve chemotherapy by platinum complexes. In addition, the findings of the present work make new insights into mechanisms associated with antitumor effects of dinuclear/trinuclear Pt(II) complexes possible.
authors.affiliation: Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, CZ-61265 Brno, Czech Republic.
authors.forename: Lenka
authors.initials: L
authors.lastname: Zerzankova
authors.forename: Tereza
authors.initials: T
authors.lastname: Suchankova
authors.forename: Oldrich
authors.initials: O
authors.lastname: Vrana
authors.forename: Nicholas P
authors.initials: NP
authors.lastname: Farrell
authors.forename: Viktor
authors.initials: V
authors.lastname: Brabec
authors.forename: Jana
authors.initials: J
authors.lastname: Kasparkova
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology*; D001483:Base Sequence; D002474:Cell-Free System; D004247:DNA / Q000737:chemistry*; D004260:DNA Repair; D005453:Fluorescence; D005978:Glutathione / Q000737:chemistry; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009944:Organoplatinum Compounds / Q000737:chemistry / Q000494:pharmacology*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; D013455:Sulfur; D004247:DNA; D005978:Glutathione
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