摘要
目的探讨表皮生长因子(EGF)促进胰腺癌细胞侵袭和转移的分子机制。方法用WST-1细胞增殖实验、细胞黏附实验和Transwell体外侵袭实验检测EGF对胰腺癌细胞系NOR-P1的增殖、黏附及侵袭能力的影响。采用Western blot和逆转录-聚合酶链反应(RT-PCR)检测uPA的表达。用凝胶电泳迁移实验检测核因子-κB(NF-κB)活性。结果EGF能够明显促进胰腺癌细胞的侵袭能力,但对胰腺癌细胞的黏附力及增殖并无明显影响。EGF明显上调胰腺癌细胞的NF-κB活性和尿激酶型纤溶酶原激活物(uPA)表达。NF-κB抑制物四氢化吡咯二硫代氨基甲酸酯(PDTC)能够明显抑制EGF所诱导的NF-κB活性,同时也抑制EGF所诱导的uPA表达及胰腺癌细胞的侵袭力。结论EGF通过活化NF-κB促进胰腺癌细胞的uPA表达和侵袭力,采用NF-κB抑制剂阻断NF-κB通路有利于胰腺癌的综合治疗。
Objective To determine the effect of EGF on the invasiveness of pancreatic cancer cells and its related regulatory mechanism. Methods The effects of EGF on the proliferation, adhesion and invasion of pancreatic cancer cells were detected by WST-1 proliferation assay, adhesion assay and invasive assay. The expression of uPA was assayed by Western blot and RT-PCR. The activity of NF-κB was examined by EMSA. Results EGF significantly increased the invasiveness of pancreatic cancer cells but did not affect cell proliferation or adhesion. Increased invasiveness was associated with the induction of uPA at both mRNA and protein levels. Furthermore, EGF stimulated the NF-κB binding activity, and pretreatment of cells with a NF-κB inhibitor, pyrrolidine dithiocarbamate, markedly attenuated EGF-induced NF-κB activation. Subsequently, the EGF-induced uPA expression and invasiveness were also inhibited by NF-κB inhibitor. Conclusion Our findings indicated that NF-κB-mediated up-regulation of uPA expression is responsible for EGF-induced invasiveness in pancreatic cancer cells, and implicate that such anti-NF-κB therapy with NF-κB inhibitors may contribute to the reduction of invasiveness of pancreatic cancer.
出处
《中华肿瘤杂志》
CAS
CSCD
北大核心
2007年第12期909-912,共4页
Chinese Journal of Oncology
