title: Monofunctional platinum(II) complexes with potent tumor cell growth inhibitory activity: the effect of a hydrogen-bond donor/acceptor N-heterocyclic ligand.
abstract: In this paper we investigate the possibility of further increase the role of the N-donor aromatic base in antitumor Hollis-type compounds by conferring the possibility to act as a hydrogen-bond donor/acceptor. Therefore, we synthesized the Pt(II) complex cis-[PtCl(NH3 )2 (naph)]NO3 (1) containing the 1,8-naphthyridine (naph) ligand. The naphthyridine ligand is generally monodentate, and the second nitrogen atom can act as H-bond donor/acceptor depending upon its protonation state. The possibility of forming such an H-bond could be crucial in the interaction of the drug with DNA or proteins. Apart from the synthesis of the compound, in this study we evaluated its in vitro antitumor activity in a wide panel of tumor cell lines, also including cells selected for their sensitivity/resistance to oxaliplatin, which was compared with that of previously reported complex 2 ([PtI(2,9-dimethyl-1,10-phenanthroline)(1-methyl-cytosine)]I) and oxaliplatin and cisplatin as reference compounds. The cytotoxicity data were correlated with the cellular uptake and the DNA platination levels. Finally, the reactivity of 1 towards guanosine 5'-monophosphate (5'-GMP) and glutathione was investigated to provide insights into its mechanism of action.
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro via E. Orabona, 4, 70125 Bari (Italy). nicola.margiotta@uniba.it.
authors.forename: Nicola
authors.initials: N
authors.lastname: Margiotta
authors.forename: Salvatore
authors.initials: S
authors.lastname: Savino
authors.forename: Valentina
authors.initials: V
authors.lastname: Gandin
authors.forename: Christine
authors.initials: C
authors.lastname: Marzano
authors.forename: Giovanni
authors.initials: G
authors.lastname: Natile
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D005978:Glutathione / Q000737:chemistry / Q000378:metabolism; D006571:Heterocyclic Compounds / Q000737:chemistry*; D006801:Humans; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D008024:Ligands; D009287:Naphthyridines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D009944:Organoplatinum Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D010984:Platinum / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D056831:Coordination Complexes; D006571:Heterocyclic Compounds; D008024:Ligands; D009287:Naphthyridines; D009944:Organoplatinum Compounds; C000594504:diamminechloro(1,8-naphthyridine)platinum(II); C000594505:iodo(2,9-dimethyl-1,10-phenanthroline)(1-methyl-cytosine)platinum(II); D010984:Platinum; D006859:Hydrogen; D004247:DNA; D005978:Glutathione
keywords: 1,8-naphthyridine; antitumor agents; colorectal cancer; monofunctional platinum complexes; phenanthriplatin