【摘要】 本研究旨在探讨马钱子碱对人单核细胞白血病THP-1细胞的诱导凋亡作用及其可能的作用机制。应用CCK-8法检测马钱子碱对THP-1细胞的生长抑制作用;应用AO/EB荧光染色法、Annexin-Ⅴ/PI双染法检测马钱子碱对THP-1细胞凋亡的影响;PI单染法检测马钱子碱对THP-1细胞周期的影响;RT-PCR检测BCL-2、BAX基因的表达。结果表明,马钱子碱能有效地抑制THP-1细胞的生长,呈剂量和时间依赖关系;THP-1细胞经浓度为400μg/ml马钱子碱作用48 h后,大部分细胞核染色质被EB染成橘红色并呈固缩状,显示为晚期凋亡的细胞形态;0-400μg/ml范围内的马钱子碱作用THP-1细胞48 h后,随着药物浓度的增高,细胞凋亡率逐渐上升;与对照组相比细胞周期被阻滞于G0/G1期,并出现亚二倍体凋亡峰;RT-PCR结果显示,BCL-2基因表达明显下降,BAX基因表达上调。结论:马钱子碱能抑制THP-1细胞生长,诱导其凋亡,并对细胞周期起阻滞作用,其作用机制可能与BCL-2基因表达抑制及BAX基因表达激活有关。更多还原

【Abstract】 This study was aimed to investigate the inducing-apoptosis effect of brucine on human monocytic leukemia cell line THP-1 cells and its possible mechanism. The inhibition effect of brucine on growth of THP-1 cells was measured by CCK-8 method. Morphological changes of THP-1 cells treated with brucine was detected by acridine orange /ethidium bromide( AO /EB) double staining. Annexin-Ⅴ /PI double labeling method was used to assay the apoptosis rate of THP-1cells. The effect of brucine on THP-1 cell cycle distribution was detected by PI single staining. RT-PCR was used to detect the expression of BCL-2 and BAX. The results showed that the brucine could inhibit the THP-1 cell growth in concentration and time-dependent manners at the range of 50 to 400 μg /ml. The cells stained with AO /EB revealed that the brucine induced the nuclear chromatin condensation. After the THP-1 cells were treated with brucine of 400μg /ml for48 hours,most nucleis were stained as orange-red,and condensed,displaying the late apoptotic cell morphology.Annexin-Ⅴ /PI detection showed that brucine could induce apoptosis of THP-1 cells in a concentration-dependent manner. Compared with the control group,more cells in brucine-treated group were arrested at G0/G1phase in a concentration-dependent manner. RT-PCR detection revealed that the expression of BCL-2 was down-regulated strikingly and BAX was up-regulated. It is concluded that brucine can efficiently inhibit cell growth and block THP-1 cells in G0/G1phase. The mechanism of THP-1 cell apoptosis induced by brucine may be related to the inhibition of BCL-2 and activation of BAX.更多还原