RESUMO
Chelating ligand method has been used to synthesize baicalin-metal (Ni2+, Co2+, Cu2+) complexes (BMC). The composition and structure of BMC were characterized by the element analysis, ultraviolet spectrum (UV), infrared spectrum (IR), mass (MS) and thermal gravitational analysis (TGA). MTT was used to analyze the effects of BMC on SMMC-7721 cell proliferation. PI staining method and Annexin-V/FITC double staining method were used to analyze the effects of BMC on the cell cycle and apoptosis of SMMC-7721 cell. Fluorescence quantitative RT-PCR was used to analyze the expression of BMC on Bcl-2 gene and Bax mRNA, flow cytometry was used to analyze BMC on the expression of Bcl-2 protein and Bax protein. The antineoplastic activity and mechanism of action of BMC was explored comprehensively. The results showed that three new kinds of BMC (molar ratio of 2 : 1) were successfully prepared, the complexes molecular formula are: Na2Ni(C21H16O11)2 x 10H2O, Na2Co(C21H16O11)2 x 8H2O and Na2Cu(C21H16O11)2 x 8H2O. According to the results of cell cycle and apoptosis detection, BMC stopped cells at G0/G1 phase to S phase and G2/M phase. Gene and protein detection showed that under the given concentration and time, BMC can downregulate the expression of Bcl-2 gene in SMMC-7721 cells, and significantly decrease the expression of Bcl-2 protein, at the same time, with the increase of expression of Bax gene, the Bax protein's expression increased significantly. Which indicates that BMC restrain cell proliferation and cell apoptosis by stopping cell cycle, reducing the expression of Bcl-2 and increasing that of Bax; The anti-tumor activities of three kinds of complexes were: baicalin-copper (BC-Cu) > baicalin-cobalt (BC-Co) > baicalin-nickel (BC-Ni) > baicalin (BC), showing the dose-response relationship.
Assuntos
Humanos , Antineoplásicos , Farmacologia , Apoptose , Ciclo Celular , Linhagem Celular Tumoral , Proliferação de Células , Cobalto , Cobre , Sistemas de Liberação de Medicamentos , Flavonoides , Farmacologia , Neoplasias Hepáticas , Metabolismo , Patologia , Metais , Níquel , Proteínas Proto-Oncogênicas c-bcl-2 , Genética , Metabolismo , RNA Mensageiro , Metabolismo , Proteína X Associada a bcl-2 , Genética , MetabolismoRESUMO
To prepare beta-cyclodextrin (beta-CD)-deoxyrhaponti inclusion complex by the homogeneous method, and characterize the inclusion complex with ultraviolet-visible spectrum and fluorescence spectroscopy, in order to determine the inclusion rate, the ratio of subject-object, the binding constant of supra-molecular system and the thermodynamic function. The results showed that the designed method was so rational that the inclusion complex was successfully prepared. The ultraviolet-visible spectrophotometry method was adoptedto determine the inclusion rate of 38%, and the ratio of subject-object of 2: 1. The thermodynamic parameters of this inclusion complex: deltaH(0), deltaS(0) was all smaller than zero, which indicated that the main acting forces generated by the inclusion complex were hydrogen bonding and Vander Waals' force. deltaG(0) < 0 and deltaG(0) were directly proportional to the reaction temperature, which suggested that the reaction would spontaneously increase with the temperature rise. The polarization fluorescence method was used to quantitatively prove the non-covalent inclusion complex generated during the interaction between beta-CD interacting with DES. The results could also provide reference for studies on cyclodextrin supra-molecular system.