title: A new class of antitumor trans-amine-amidine-Pt(II) cationic complexes: influence of chemical structure and solvent on in vitro and in vivo tumor cell proliferation.
abstract: The reactions of cyclopropylamine, cyclopentylamine, and cyclohexylamine with trans-[PtCl2(NCMe)2] afforded the bis-cationic complexes trans-[Pt(amine)2(Z-amidine)2]2+[Cl-]2, 1-3. The solution behavior and biological activity have been studied in different solvents (DMSO, water, polyethylene glycol (PEG 400), and polyethylene glycol dimethyl ether (PEG-DME 500)). The biological activity was strongly influenced by the cycloaliphatic amine ring size, with trans-[Pt(NH2CH(CH2)4CH2)2{N(H) horizontal lineC(CH3)N(H)CH(CH2)4CH2}2]2+[Cl-]2 (3) being the most active compound. Complex 3 overcame both cisplatin and MDR resistance, inducing cancer cell death through p53-mediated apoptosis. Alkaline single-cell gel electrophoresis experiments indicated direct DNA damage, reasonably attributable to DNA adducts of trans-[PtCl(amine)(Z-amidine)2][Cl] species, which can evolve to produce disruptive and nonrepairable lesions on DNA, thus leading to the drug-induced programmed cancer cell death. Preliminary in vivo antitumor studies on C57BL mice bearing Lewis lung carcinoma highlighted that complex 3 promoted a significant and dose-dependent tumor growth inhibition without adverse side effects.
authors.affiliation: Department of Pharmaceutical Sciences, Universy of Padova, Via F. Marzolo 5, I-35131 Padova, Italy.
authors.forename: Cristina
authors.initials: C
authors.lastname: Marzano
authors.forename: Silvia
authors.initials: S
authors.lastname: Mazzega Sbovata
authors.forename: Valentina
authors.initials: V
authors.lastname: Gandin
authors.forename: Davide
authors.initials: D
authors.lastname: Colavito
authors.forename: Elda
authors.initials: E
authors.lastname: Del Giudice
authors.forename: Rino A
authors.initials: RA
authors.lastname: Michelin
authors.forename: Alfonso
authors.initials: A
authors.lastname: Venzo
authors.forename: Roberta
authors.initials: R
authors.lastname: Seraglia
authors.forename: Franco
authors.initials: F
authors.lastname: Benetollo
authors.forename: Mariano
authors.initials: M
authors.lastname: Schiavon
authors.forename: Roberta
authors.initials: R
authors.lastname: Bertani
mesh_terms: D000578:Amidines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000588:Amines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D018827:Carcinoma, Lewis Lung / Q000188:drug therapy; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002945:Cisplatin / Q000494:pharmacology; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D018360:Crystallography, X-Ray; D004249:DNA Damage / Q000187:drug effects; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D010984:Platinum; D012995:Solubility; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis
chemical_list: D000578:Amidines; D000588:Amines; D000970:Antineoplastic Agents; D056831:Coordination Complexes; D016159:Tumor Suppressor Protein p53; D010984:Platinum; D002945:Cisplatin