肿瘤坏死因子相关细胞凋亡诱导配体受体-4在人胰腺癌组织中的表达

目的：通过检测肿瘤坏死因子相关细胞凋亡诱导配体受体-4(TRAIL-R4)在胰腺癌组织中的表达，探讨胰腺癌细胞抵抗细胞凋亡的机理。方法：应用mRNA印迹法(Northern blotting)、蛋白质印迹法(Western blotting)和免疫组织化学技术，定性、定位分析TRAIL-R4在正常胰腺组织和胰腺癌组织中的表达。结果：TRAIL-R4 mRNA和蛋白在正常胰腺组织中呈弱表达或不表达，而在胰腺癌组织中呈高表达；免疫组织化学检测显示，在胰腺癌细胞中TRAIL-R4蛋白呈强染色。结论：TRAIL-R4表达水平在正常胰腺组织与胰腺癌组织中存在显著差异，提示胰腺癌细胞中可能存在对TRAIL介导的细胞凋亡抵抗新机理。

Expression of Tumor Necrosis Factor Related Apoptosis Inducing Ligand Receptor-4 in Human Pancreatic Cancer

Objective To investigate the mechanism of the resistance of pancreatic cancer cells to tumor necrosis factor related apoptosis inducing ligand (TRAIL)-mediated apoptosis. Methods The expression of TRAIL receptor-4 (TRAIL-R4) in normal pancreas tissue and pancreatic cancer was analyzed by using Northern blotting, Western blotting and immunohistochemistry. Results TRAIL-R4 mRNA and protein were expressed at moderate to high levels in human pancreatic cancer, but demonstrated weak to negative in the normal pancreas. Moreover, pancreatic cancer cells showed strong TRAIL-R4 immunostaining throughout the tumor mass. Conclusion TRAIL-R4 levels are significantly different in pancreatic cancer in comparison to the normal pancreas. These findings give new insights into the resistance mechanisms of pancreatic cancer cells towards TRAIL-mediated apoptosis.