小干扰RNA抑制胃癌细胞肝素酶表达及侵袭的实验研究  

Inhibitory effect of siRNA on heparanase expression and invasion ability of gastric cancer cells:an in vitro experiment

作　　者：张勇[1] 王振宁[1] 张学[2] 徐惠绵[1] 姜莉[2] 罗阳[2] 邢丽丽[1] 徐米多[2] 李娟[1] 

机构地区：[1]中国医科大学第一附属医院肿瘤外科,沈阳110001 [2]中国医科大学基础医学院基因组学教研室

出　　处：《中华医学杂志》2007年第24期1717-1720,共4页National Medical Journal of China

基　　金：国家自然科学基金(30300342);辽宁省高 校优秀人才支持计划基金(RC-05-02)

摘　　要：目的利用 RNA 干扰(RNAi)技术封闭胃癌细胞系 SGC7901肝素酶表达,观察其对肿瘤细胞侵袭能力的影响。方法体外转录合成小于扰 RNA(siRNA),经脂质体转染胃癌细胞系;结合逆转录(RT)-PCR,Western 印迹检测类肝素酶 mRNA 及蛋白质表达;通过体外侵袭实验评价肝素酶RNAi 后胃癌细胞系的侵袭能力变化。结果肝素酶 siRNA 分子可以特异性地抑制 SGC7901细胞肝素酶 mRNA,抑制率达(70±6)%;肝素酶 RNAi 后 SGC7901细胞的侵袭抑制率达(61±36)%。结论靶向肝素酶基因的 siRNA 分子能特异性抑制其蛋白表达水平,降低肿瘤细胞的侵袭能力。肝素酶是促进胃癌细胞侵袭转移的关键分子,并可为抑制胃癌侵袭转移提供新策略。Objective To investigate the inhibitory effect of siRNA on heparanase expression and invasion ability gastric cancer cells. Methods A heparanase mRNA-targeting double-stranded siRNA was designed with the bioinformatics technology. Human gastric cancer cells of the line SGC7901 were cultured and transfected with the siRNA of the concentrations of 5,10,20, and 40 nmol/L respectively. Forty-eight hours later RT-PCR and Western blotting were applied to detect the mRNA and protein expression of heparanase. Millicell chamber assay was performed to detect the invasion ability of the SGC7901 cells. Blank control group and negative control group were set. Results The mRNA expression level of the cells transfected with the siRNA of the concentrations 20 nmol/L and 40 nmol/L were 0. 207 ± 0. 095 and 0.200 ± 0.085 respectively, both significantly lower than that of the control group （0.60 ± 0.09, both P 〈 0. 05）. Western blotting showed that the protein expression of heparanase of the different siRN.A subgroups were all decreased dose-dependently; and no heparanase band was seen in the 40 nmol/L subgroup. The invasion rate of the siRNA group was significantly lower than that of the control group with a mean inhibition rate of （61 ±36）%. Conclusion RNAi inhibits the expression of heparanase and the invasion ability of human gastric cancer cells. Heparanase may be a new target in treatment of gastric cancer＇s metastasis.

关 键 词：肝素裂合酶 肿瘤侵润 RNA干扰 

分 类 号：R735.2[医药卫生—肿瘤]