双氢青蒿素通过调节凋亡相关蛋白的表达及活性氧的产生而抑制胰腺癌JF-305细胞的增殖

探讨双氢青蒿素诱导人胰腺癌JF-305细胞凋亡作用及活性氧在双氢青蒿素诱导JF-305细胞凋亡中的作用。采用MTT法考察不同浓度双氢青蒿素对人胰腺癌JF-305细胞增殖的影响,流式细胞术检测细胞周期,Hochest 333258荧光染色法观察细胞凋亡形态,Annexin V荧光染色法检测JF-305细胞凋亡的变化,DCFH-DA检测凋亡过程中活性氧(ROS)的变化。Western blot检测细胞内Bax,Bcl-2,Cleaved caspase-3,Cleaved caspase-9和Cyto C蛋白表达的变化。与对照相比,双氢青蒿素作用JF-305细胞48 h,细胞增殖受到明显抑制(P0.05);细胞被阻滞于G2/M期;细胞出现核浓缩聚集、碎裂的凋亡形态,细胞凋亡比例升高(P0.05);DCFH-DA检测双氢青蒿素给药组细胞ROS明显升高(P0.05);Western blot结果显示,双氢青蒿素作用后细胞内Bcl-2蛋白表达下调,Bax蛋白表达上调,Bax/Bcl-2蛋白表达比例升高,Cleaved caspase-3,Cleaved caspase-9和Cyto C蛋白表达升高。双氢青蒿素能诱导JF-305细胞凋亡,其凋亡过程可能与ROS的生成增加相关。

Dihydroartemisinin inhibits proliferation of pancreatic cancer JF-305 cells by regulating expression of apoptosis related proteins and production of reactive oxygen species

To investigate the effect of dihydroartemisinin on apoptosis of human pancreatic cancer cell line JF-305 and the role of reactive oxygen species(ROS) in the apoptosis of JF-305 cells induced by dihydroartemisinin. MTT assays were used to detect effect of different concentrations of dihydroartemisinin on cells proliferation of JF-305 lines. Cell cycle was detected by flow cytometry, and the apoptotic morphology was observed by Hoechst 333258 fluorescence staining. Annexin V fluorescence staining was used to detect the apoptosis changes of JF-305 cells, while DCFH-DA was used to detect the changes of ROS during apoptosis process. Western blot was used to detect the protein expression changes of Bax, Bcl-2, Cleaved caspase-3, Cleaved caspase-9 and Cyto C. As compared with the control group, the JF-305 cells proliferation was inhibited significantly(P<0.05) after treatment with different concentrations of dihydroartemisimin for 48 h; cell cycle was blocked in the G₂/M phase; apoptotic morphology of nuclear condensation, aggregation, and fragmentation was found, and the apoptosis ratio was increased(P<0.05). DCFH-DA detection showed that the cell ROS was increased significantly after dihydroartemisinin treatment(P<0.05). Western blot results showed that the expression of Bcl-2 protein was down-regulated; the expression of Bax protein was up-regulated; the ration of Bax/Bcl-2 was increased and the protein expression levels of Cleaved caspase-3, Cleaved caspase-9 and Cyto C were increased after dihydroartemisinin treatment. Therefore, dihydroartemisinin could induce apoptosis of JF-305 cells, and the possible mechanism may be related to the formation and increasing of ROS.