Structural and solution chemistry, antiproliferative effects, and DNA and protein binding properties of a series of dinuclear gold(III) compounds with bipyridyl ligands.
A series of six dinuclear gold(III) oxo complexes with bipyridyl ligands, of general formula [Au2(N,N)2(mu-O)2][PF6]2 (Auoxo1-Auoxo6) [where N,N = 2,2'-bipyridine (1), 4,4'-di-tert-butyl- (2), 6-methyl- (3), 6-neopentyl- (4), 6-(2,6-dimethylphenyl)- (5), 6,6'-dimethyl-2,2'-bipyridine (6)], were investigated as potential cytotoxic and anticancer agents, and their antiproliferative properties were evaluated in vitro toward the reference A2780 human ovarian carcinoma cell line. While five compounds manifested moderate cytotoxic properties (with IC50 approximately 10-30 microM), the sixth one (Auoxo6), turned out to be approximately 5-15 times more active against both cell lines and will merit further pharmacological studies. The interactions of Auoxo1 and Auoxo6 with a few model proteins (serum albumin, cytochrome c, ubiquitin) and with calf thymus DNA were analyzed in detail by various spectroscopic methods. Both tested compounds manifested a high and peculiar reactivity toward the mentioned model proteins; specific differences were detected in their reactivity with DNA. The mechanistic implications of these results are discussed.
Casini
Angela
A
Department of Chemistry, University of Florence, Florence, Italy.
Cinellu
Maria Agostina
MA
Minghetti
Giovanni
G
Gabbiani
Chiara
C
Coronnello
Marcella
M
Mini
Enrico
E
Messori
Luigi
L
D015082:2,2'-Dipyridyl / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D004247:DNA / Q000737:chemistry*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D008024:Ligands; D050607:Organogold Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011485:Protein Binding; D012996:Solutions; D013329:Structure-Activity Relationship
D000970:Antineoplastic Agents; D008024:Ligands; D050607:Organogold Compounds; D012996:Solutions; D015082:2,2'-Dipyridyl; D004247:DNA; C427203:calf thymus DNA