| Autor: |
Ribeiro GH; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Guedes APM; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., de Oliveira TD; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., de Correia CRSTB; Departamento de Genética e Evolução, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Colina-Vegas L; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil.; Instituto de Química, Universidade Federal do Rio Grande do Sul, CP 15003, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil., Lima MA; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Nóbrega JA; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Cominetti MR; Departamento de Gerontologia, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo Brazil., Rocha FV; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Ferreira AG; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Castellano EE; Instituto de Física de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, São Paulo, Brazil., Teixeira FR; Departamento de Genética e Evolução, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil., Batista AA; Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, São Paulo, Brazil. |
| Abstrakt: |
In this paper, a series of new ruthenium complexes of the general formula [Ru(NS)(dpphpy)(dppb)]PF 6 ( Ru1 - Ru3 ), where dpphpy = diphenyl-2-pyridylphosphine, NS ligands = 2-thiazoline-2-thiol (tzdt, Ru1 ), 2-mercaptopyrimidine (pySm, Ru2 ), and 4,6-diamino-2-mercaptopyrimidine (damp, Ru3 ), and dppb = 1,4-bis(diphenylphosphino)butane, were synthesized and characterized by elemental analysis, spectroscopic techniques (IR, UV/visible, and 1D and 2D NMR), and X-ray diffraction. In the characterization, the correlation between the phosphorus atoms and their respective aromatic hydrogen atoms of the compounds in the assignment stands outs, by 1 H- 31 P HMBC experiments. The compounds show anticancer activities against A549 (lung) and MDA-MB-231 (breast) cancer cell lines, higher than the clinical drug cisplatin. All of the complexes are more cytotoxic against the cancer cell lines than against the MRC-5 (lung) and MCF-10A (breast) nontumorigenic human cell lines. For A549 tumor cells, cell cycle analysis upon treatment with Ru2 showed that it inhibits the mitotic phase because arrest was observed in the Sub-G1 phase. Additionally, the compound induces cell death by an apoptotic pathway in a dose-dependent manner, according to annexin V-PE assay. The multitargeted character of the compounds was investigated, and the biomolecules were DNA, topoisomerase IB, and proteasome, as well as the fundamental biomolecule in the pharmacokinetics of drugs, human serum albumin. The experimental results indicate that the complexes do not target DNA in the cells. At low concentrations, the compounds showed the ability to partially inhibit the catalytic activity of topoisomerase IB in the process of relaxation of the DNA plasmid. Among the complexes assayed in cultured cells, complex Ru3 was able to diminish the proteasomal chymotrypsin-like activity to a greater extent. |
