Complexos mono e dinucleares de platina(II) com ligantes aminados N-alquilados de cadeia longa: síntese, caracterização e incorporação em lipossomas

Abstract

Cancer is considered a public health problem, accounting for about 12% of all causes of death around the world. The treatment of this disease can be achieved using chemotherapy, a very important alternative. Since the discovery of the antitumor activity of cisplatin, studies involving the use of metal complexes as drugs have grown substantially, since cisplatin shows high activity, but on the other hand, severe side effects. Therefore, aiming to improve the spectrum of antitumor activity, reduce these side effects and cellular resistance, the synthesis of platinum complexes have been of great interest in scientific research. Within this context, the principal objective of the present work is to obtain novel platinum complexes with potential biological activity, to incorporate these complexes into liposomes, and hoping for a potential increase in their biological activity. The complexes present long alkyl chain diamine as ligands. The first series of complexes incorporates a terminal hydroxyl substituent and the second series are constituted of dinuclear complexes. The synthesized complexes were characterized by IR, 1H, 13C and 195Pt NMR spectroscopies, elemental analysis and their cytotoxicities have been investigated in both normal and tumor cells. Our research group has previously studied complexes employing long chain, N-alkyl derivatives of diamines as ligands. We are interested in investigating the impact of the new ligands on the activity of the complexes, considering that the presence of the hydroxyl group could affect the polarity of the complex and consequently, its interaction with biomolecules and the cellular membrane.