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Hydroxycamptothecin inhibits proliferation of human lung carcinoma cell line A549 and down-regulates its Bcl-2 gene expression in vitro
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- Author:
- No author available
- Journal Title:
- Journal of Southern Medical University
- Issue:
- 9
- DOI:
- 10.3969/j.issn.1673-4254.2012.09.029
- Key Word:
- 羟基喜树碱;肺腺癌;A549细胞;细胞凋亡;细胞周期
Abstract： 目的 研究羟基喜树碱对肺癌A549细胞生长抑制、细胞周期和细胞凋亡的影响.方法 羟基喜树碱处理A549细胞后用吖啶橙/溴化乙锭(AO/EB)染色观察细胞形态学变化,琼脂糖凝胶检测DNA片段化,用流式细胞仪测定其对细胞周期影响.利用Annexin V-FITC/PI检测细胞凋亡,RT-PCR检测凋亡相关基因Bcl-2的表达变化.结果 A549细胞经羟基喜树碱作用,提取DNA进行琼脂糖凝胶电泳可见梯状条带.经AO/EB染色,荧光显微镜下观察到早期凋亡细胞细胞核被染成绿色,皇碎片状,晚期凋亡细胞核染色质为橘红色并呈固缩状或圆珠状,细胞周期S期由20％升高到60％.经1μmol/L羟基喜树碱处理24h后,流式细胞术显示A549细胞的凋亡率为18.11％,明显高于对照组细胞凋亡率(0.09％,P＜0.05).经羟基喜树碱作用后,A549细胞Bcl-2基因表达下调70％(P＜0.05).结论 羟基喜树碱可以明显抑制A549细胞增殖,诱导其凋亡,并下调Bcl-2基因表达,提示Bcl-2下调参与了羟基喜树碱对A549细胞的抑制作用.
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