Résumé
Objective To observe the changes of antithrombin activity(AT) and D-dimer in acute leukemia(AL)children complicated with disseminated intravascular coagulation(DIC) and to explore the changes of blood coagulation and fibrinolysis function.Methods Twenty-seven AL children without DIC were selected as AL group and 25 childern complicated with DIC were selected as observe group,36 health children were as control group.Plasma level of AT,D-dimer,fibrinogen,activated partial thromboplastin time and prothrombin time were tested by color substrate,immuno-latex turbidimetry,and coagulation method.And the rusults of AL group were compared with observe group and control group by SPSS 10.0 software.Results PT was significantly prolonged and the D-dimer in AL group and observation group were significantly higher than those in control group(Pa
Résumé
This study was aimed to investigate the effects and the mechanism of mangiferin on chronic myeloid leukemia cell lines K562 cells in vitro. The antiproliferation effects of mangiferin on K562 leukemia cells were tested by tetrazolium salt (MTT) method; the apoptosis induced by mangiferin on K562 cell line was explored by means of cell morphology, DNA gel electrophoresis and flow cytometry. The changes in bcr/abl gene expression was detected by using reverse transcriptase (RT)-PCR. The results showed that five different concentrations of mangiferin (25 - 200 micromol/L) dose-dependently and time-dependently inhibited the proliferation of K562 cells, and induced apoptosis in K562 cell line. RT-PCR revealed that bcr/abl gene expression was down-regulated when K562 cells had been treated with different concentrations of mangiferin. In conclusion, mangiferin remarkably inhibits the proliferation of K562 leukemia cells in vitro, and induces apoptosis in K562 cell line probably through down-regulation of bcr/abl gene expression.