Aim To study the influences of miR-203on ursolic acid(UA) sensitivity in leukemic K562cell. Methods In the experimental system,eukaryotic expression vector of hsa-miR-203(PmiR-203) was transfected into K562 cells using LipofectamineTM2000. K562 cells were incubated with different concentration of UA alone or in combination withPmiR-203. The cell proliferation was analyzed by MTT assay. The cell apoptosis was measured by double staining with Annexin V and Propidium Iodide. The expression of Bcr /abl protein ...