Effect of compound Zhe-Bei granule (CZBG) combined with doxorubicin on cell apoptosis and expression of related proteins in K562/A02 multidrug resistance tumor xenografts in mice / 中国实验血液学杂志

ABSTRACT

This study was purposed to investigate the effects of compound Zhe-Bei granule (CZBG) combined with doxorubicin (Dox) on the expression of BCL-2, BAX and cell apoptosis rate in K562/A02 multidrug resistant tumor xenografts. Tumor xenograft model was established by injecting the K562/A02 cells into the axillary flank of BALB/c nude mice. The cell apoptosis rate of xenografts was detected by flow cytometry with Annexin V-FITC/PI staining. The expressions of BCL-2 and BAX in xenografts were measured by immunohistochemistry staining. The value of integral optical density (IOD) was calculated according to staining image on slide. The results indicated that as compared with normal saline control group and Dox group, the high, middle, low dose of CZBG combined with Dox could increase the cell apoptosis rate of tumor xenografts with statistical significance (p < 0.05); and could decrease the IOD value of BCL-2 and increase the IOD value of BAX in xenografts with statistical significance (p < 0.05). It is concluded that CZBG combined with Dox can enhance the apoptosis rate in K562/A02 cells, down-regulate the expression of BCL-2 and up-regulate the expression of BAX, thereby, can reverse the multidrug resistance of K562/A02 cells by decreasing the ratio of BCL-2/BAX.