title: Mechanistic insights into antitumor effects of new dinuclear cis Pt(II) complexes containing aromatic linkers.
abstract: The primary objective was to understand more deeply the molecular mechanism underlying different antitumor effects of dinuclear Pt(II) complexes containing aromatic linkers of different length, {[cis-Pt(NH(3))(2)Cl](2)(4,4'-methylenedianiline)}(2+) (1) and {[cis-Pt(NH(3))(2)Cl](2)(alpha,alpha'-diamino-p-xylene)}(2+) (2). These complexes belong to a new generation of promising polynuclear platinum drugs resistant to decomposition by sulfur nucleophiles which hampers clinical use of bifunctional polynuclear trans Pt(II) complexes hitherto tested. Results obtained with the aid of methods of molecular biophysics and pharmacology reveal differences and new details of DNA modifications by 1 and 2 and recognition of these modifications by cellular components. The results indicate that the unique properties of DNA interstrand cross-links of this class of polynuclear platinum complexes and recognition of these cross-links may play a prevalent role in antitumor effects of these metallodrugs. Moreover, the results show for the first time a strong specific recognition and binding of high-mobility-group-domain proteins, which are known to modulate antitumor effects of clinically used platinum drugs, to DNA modified by a polynuclear platinum complex.
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: Hana
authors.initials: H
authors.lastname: Kostrhunova
authors.forename: Marie
authors.initials: M
authors.lastname: Vojtiskova
authors.forename: Olga
authors.initials: O
authors.lastname: Novakova
authors.forename: Tereza
authors.initials: T
authors.lastname: Suchankova
authors.forename: Miaoxin
authors.initials: M
authors.lastname: Lin
authors.forename: Zijian
authors.initials: Z
authors.lastname: Guo
authors.forename: Jana
authors.initials: J
authors.lastname: Kasparkova
authors.forename: Viktor
authors.initials: V
authors.lastname: Brabec
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D002945:Cisplatin / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D003432:Cross-Linking Reagents / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D018736:DNA Adducts / Q000737:chemistry / Q000378:metabolism; D004249:DNA Damage / Q000187:drug effects / Q000502:physiology; D006367:HeLa Cells; D006801:Humans
chemical_list: D000970:Antineoplastic Agents; D003432:Cross-Linking Reagents; D018736:DNA Adducts; D002945:Cisplatin