| Autor: |
Tian L; Department of Hematology and Oncology, Southeast University Clinical Medical College, Nanjing, China., Liu J, Chen BA, Cheng J, Ding JH, Wang S, Xia GH, Gao F, Shao ZY, Zhang HJ, Guo QL, Zhang HW, Wang L, Ren YY, Cai XH, Liu R |
| Jazyk: |
čínština |
| Zdroj: |
Zhongguo shi yan xue ye xue za zhi [Zhongguo Shi Yan Xue Ye Xue Za Zhi] 2012 Apr; Vol. 20 (2), pp. 252-7. |
| Abstrakt: |
This study was purposed to investigate the reversal effect of gambogic acid (GA) on multidrug resistance of K562/A02 cells and its mechanism. The IC(50) (half maximal inhibitory concentration) of adriamycin (ADM) was evaluated by MTT. Cell apoptosis was detected by flow cytometry. Morphological changes of K562/A02 cells were observed by fluorescent microscopy with DAPI staining. The expressions of Survivin and P-gp were determined by Western blot. The results showed that the IC(50) of ADM on K562 and K562/A02 cell proliferation were (1.42 ± 0.07) µg/ml and (28.42 ± 1.40) µg/ml respectively. GA ≤ 0.0625 µmol/L had no inhibitory effect on proliferation of K562 and K562/A02. 0.0625 µmol/L GA could enhance the sensitivity of K562/A02 cells to ADM (P < 0.05) and the reversal multiples was 1.53. The apoptotic rate was raised after treating with ADM combined with 0.0625 µmol/L GA for 48 h (P < 0.05). Morphological differences were typical and obvious between cells of control and treated groups under fluorescence microscopy using DAPI staining. After treating K562/A02 cells with ADM combined with 0.0625 µmol/L GA for 48 h, the expressions of Survivin and P-gp were down-regulated at protein levels. It is concluded that GA can enhance the sensitivity of K562/A02 cells to ADM, which may be related to increasing cell apoptosis and down-regulating expressions of Survivin and P-gp. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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