硼替佐米联合阿糖胞苷协同诱导U937细胞凋亡机制的深入研究

Mechanism of Apoptosis Synergistically Induced by Bortezomib Combined with Cytarabine in U937 Cell Line

本研究旨在探讨蛋白酶体抑制剂硼替佐米联合低浓度阿糖胞苷协同诱导U937细胞凋亡的机制。通过细胞计数检测细胞增殖,用流式细胞仪分析细胞周期和活性氧(ROS)水平,Western blot检测凋亡信号通路相关蛋白的表达。结果表明,10 nmol/L硼替佐米联合50 nmol/L阿糖胞苷对U937细胞有明显增殖抑制作用。两药联合协同诱导细胞凋亡。两药联合较单药处理能明显协同增加U937细胞ROS的水平,并能明显上调U937细胞中p-P38,p-JNK表达,下调p-ERK的表达。结论:硼替佐米联合阿糖胞苷协同诱导U937细胞凋亡,其机制可能与ROS的损伤导致JNK、P38通路的激活和ERK的下调,从而影响细胞线粒体途径有关。

This study was aimed to further explore the apoptosis-inducing effect of bortezomib combined with cytarabine （Ara-C） on U937 cell line. Proliferation and apoptosis in U937 cells treated with bortezomib and/or Ara-C were assessed by cell count. Cell cycle distribution and reactive oxygen species （ROS） production level were measured by using flow cytometry. Cell signaling pathway related to apoptosis was analyzed by Western blot. The results showed that 10 nmol/L bortezomib combined with 50 nmol/L Ara-C significantly inhibited U937 cell proliferation. These two drug combination synergistically induced apoptosis in U937 cells, significantly increased cellular ROS level, and up- regulated the expression of phosphorylated form of JNK and P38 and down-regulated phosphorylation of ERK. It is concluded that the apoptosis of U937 cells synergistically induced by bortezomib combined with low concentration Ara-C is possibly associated with up-regulation of phosphorylated form of JNK, P38 and down-regulation of phosphorylation of ERK induced by increase of ROS, resulting in decrease of mitochrondrial potential.