氧化苏木素诱导肺癌 A549细胞凋亡及对内质网应激通路的影响

目的：探讨氧化苏木素对人肺癌A549细胞的凋亡作用及其对内质网应激通路的影响。方法采用噻唑蓝（MTT）细胞毒实验检测氧化苏木素对肺癌A549细胞的毒性作用；流式细胞仪检测细胞凋亡的发生；Western blot检测葡萄糖调节蛋白78（GRP78）和细胞质细胞色素C（cyto‐c）表达的变化。结果氧化苏木素对人肺癌A549细胞的IC50值为（5．36±0．62）μmol／L。0、5、10、20μmol／L的氧化苏木素作用肺癌A549细胞48 h后，细胞凋亡率分别为（1．15±0．32）％、（19．61±4．52）％、（30．18±6．35）％和（39．48±7．44）％，各组间差异有统计学意义（P＜0．05）。与对照组比较，5、10和20μmol／L 氧化苏木素作用肺癌A549细胞48 h后，GRP78出现显著的升高，细胞质中的cyto‐c也显著增加。结论氧化苏木素通过内质网应激途径诱导了人肺癌A549细胞凋亡。

Brazilein induced cells apoptosis in human lung cancer A549 cells and its effects on endoplasmic reticulum stress

Objective To study the apoptotic effect of brazilein on human lung cancer A549 cells and endoplasmic reticulum stress .Methods The cytotoxic activity was tested by MTT assay in A549 cells .The flow cytometry was used to detect apoptosis . Western blotting was performed to detect GRP78 and cyto c protein expression .Results The IC50 values of brazilein against A549 cells was (5 .36 ± 0 .62)μmol/L .After treatment with 0 ,5 ,10 and 20 μmol/L brazilein for 48 h ,the percent of apoptosis was (1 .15 ± 0 .32)% ,(19 .61 ± 4 .52)% ,(30 .18 ± 6 .35)% and (39 .48 ± 7 .44)% respectively .There was significant difference among the different treatment (P< 0 .05) .Compared with control group ,the protein expression of GRP78 and cytosolic cyto c was in‐creased after 5 ,10 and 20 μmol/L brazilein treated for 48 h .Conclusion Brazilein induced apoptosis in human lung cancer A549 cells though endoplasmic reticulum stress pathway .