Gold(i) complexes of water-soluble diphos-type ligands: Synthesis, anticancer activity, apoptosis and thioredoxin reductase inhibition?

Dalton Transactions Pub Date: 2011-08-09 DOI: 10.1039/C1DT10368G

Abstract

Gold(I) complexes of imidazole and thiazole-based diphos type ligands were prepared and their potential as chemotherapeutics investigated. Depending on the ligands employed and the reaction conditions complexes [L(AuCl)2] and [L2Au]X (X = Cl, PF6) are obtained. The ligands used are diphosphanes with azoyl substituents R2P(CH2)2PR2 {R = 1-methylimidazol-2-yl (1), 1-methylbenzimidazol-2-yl (4), thiazol-2-yl (5) and benzthiazol-2-yl (6)} as well as the novel ligands RPhP(CH2)2PRPh {R = 1-methylimidazol-2-yl (3)} and R2P(CH2)3PR2 {R = 1-methylimidazol-2-yl (2)}. The cytotoxic activity of the complexes was assessed against three human cancer cell lines and a rat hepatoma cell line and correlated to the lipophilicity of the compounds. The tetrahedral gold complexes [(3)2Au]PF6 and [(5)2Au]PF6 with intermediate lipophilicity (logD7.4 = 0.21 and 0.25) showed significant cytotoxic activity in different cell lines. Both compounds induce apoptosis and inhibit the enzymes thioredoxin reductase and glutathione reductase.

Graphical abstract: Gold(i) complexes of water-soluble diphos-type ligands: Synthesis, anticancer activity, apoptosis and thioredoxin reductase inhibition
Recommended Literature