肿瘤细胞对TRAIL敏感性与其表面DR5表达水平的相关性研究

目的　探讨肿瘤细胞表面DR5表达水平与其对肿瘤坏死因子相关的凋亡诱导配体(TRAIL)敏感性之间的关系。方法　利用抗DR5特异性单克隆抗体 ,采用流式细胞仪技术直接检测不同肿瘤细胞系表面DR5的表达水平 ,并采用TRAIL凋亡检测试剂盒检测肿瘤细胞对TRAIL诱导凋亡的敏感性 ,研究两者之间的关系。结果　不同肿瘤细胞表面DR5的表达水平分别为 :U937细胞97.9%、Jurkat细胞 95 .1%、SW4 80细胞 93.8%、HCT116细胞 86 .2 %、HL 6 0细胞 6 4 .2 %、HeLa细胞4 6 .6 %、K5 6 2细胞 13.1% ;TRAIL诱导的细胞凋亡率分别为 :U937细胞 72 .6 %、Jurkat细胞 85 .2 %、SW4 80细胞 78.6 %、HCT116细胞 70 .2 %、HL 6 0细胞 6 0 .1%、HeLa细胞 4 5 .4 %、K5 6 2细胞 12 .3%。经统计学分析 ,两者之间呈现非常明显的正相关 (r=0 .997,P <0 .0 0 1)。结论　肿瘤细胞对TRAIL的敏感性与其表面DR5表达水平有关 ,表明DR5的表达水平在TRAIL诱导细胞凋亡方面起着十分重要的作用

Correlation between sensitivity to TRAIL and expression level of DR5 on surface of tumor cells

Objective To investigate the correlation between sensitivity to tumor necrosis factor-related apoptosis inducing ligand (TRAIL)and expression level of death receptor 5 (DR5) on tumor cell surface. Methods Anti-DR5 mAb was used to detect expression level of DR5 on surface of tumor cells by flow cytometry. Sensitivity to apoptosis induced by TRAIL was determined by TRAIL apoptosis kit. The correlation between expression level of DR5 and sensitivity to TRAIL was analyzed. Results The expression of DR5 on surface of tumor cells was approximately 97.9% in U937 cells, 95.1% in Jurkat cells, 93.8% in SW480 cells, 86.2% in HCT116 cells, 64.2% in HL-60 cells, 46.6% in HeLa cells and 13.1% in K562 cells, respectively. The apoptosis rate induced by TRAIL was 72.6% in U937 cells, 85.2% in Jurkat cells, 78.6% in SW480 cells, (70.2%) in HCT116 cells, 60.1% in HL-60 cells, 45.4% in HeLa cells and 12.3% in K562 cells, respectively. There was a significant positive correlation between the expression level of DR5 with TRAIL-inducing apoptosis ((r=0.997),P<0.001). Conclusion TRAIL-inducing apoptosis is related to the expression level of DR5 on surface of tumor cells. The results confirm the importance of DR5 expression for induction of apoptosis by TRAIL.