摘要
目的 探讨脑胶质瘤相关癌基因-1(Gli1)在胰腺癌细胞侵袭和迁移中的作用及可能机制.方法 体外培养胰腺癌细胞株Capan-2,通过RNA干扰技术分别干扰Capan-2细胞中的Gli1、小鼠双微体基因2(MDM2)和p53基因的表达.应用实时定量(qRT)-PCR试验进行干扰效应的验证;通过细胞侵袭和迁移实验观察干扰Capan-2细胞中Gli1、MDM2和p53表达对胰腺癌细胞侵袭和迁移的影响.同时通过Western blot法检测干扰Gli1表达后,金属基质蛋白酶-9(MMP-9)、磷酸化细胞外信号调节蛋白激酶(pERK)及磷酸化蛋白激酶B(pAKT)在Capan-2细胞中表达的变化.采用配对t检验对实验数据进行统计学分析.结果 qRT-PCR试验结果显示,干扰Gli1、MDM2、p53表达后,其mRNA水平较仅加脂质体组和对照组相比分别下调了70.5%和74.5%、61.8%和65.3%、73.8%和78.2%.在p53野生型Capan-2细胞中,干扰Gli1表达后胰腺癌细胞侵袭(94±8)和迁移能力(143±8)较对照组(150 ±7,190±10)均明显减弱(=6.584,P=0.022;t=8.266,P=0.014);干扰MDM2表达亦降低了细胞的侵袭(实验组:85±12,对照组:138 ±6)和迁移能力(实验组:127 ±9,对照组:180±10)(t=5.097,P=0.036;t =4.860,P=0.040).然而,体外干扰p53基因表达后,Capan-2细胞的侵袭(153 ±11)和迁移能力(209±13)较干扰前(106 ±7,164±8)却明显增强(t=4.669,P=0.043;t=4.990,P=0.038).Western blot法检测结果显示,体外干扰Gli1表达后MMP-9蛋白表达水平下调,但pERK和pAKT蛋白水平表达无改变.结论 Gli1可能通过调控MDM2、p53及MMP-9的表达水平促进胰腺癌细胞的侵袭和迁移.
Objective To study the role and possible mechanism of glioma-associated oncogene-1 (Gli1) in regulating the cell invasion and migration of pancreatic cancer cells.Methods Quantitative realtime (qRT)-PCR was used to detect the effect of siRNA interference on Gli1,murine double minute 2 (MDM2) and p53 genes.Cell invasion and migration assays were used to observe the effect of Gli1,MDM2 and p53 silence on cell invasion and migration in p53 wild-type Capan-2 pancreatic cancer cells,respectively.Meanwhile,immunoblotting(IB) was used to detect the protein level of matrix metalloproteinase (MMP)-9,phospho-excelluar signal-regulated kinase (pERK) and phosphorylation protein kinase B (pAKT) in Gli1-silencing Capan-2 cells.The data were analyzed by paired t-test.Results qRT-PCR showed that the expression of Gli1,MDM2 and p53 is down-regulated 70.5% and 74.5%,61.8% and 65.3%,and 73.8% and 78.2% after siRNA interference,compared with the mock and siRNA control groups,respectively.Cell invasion(94 ± 8)and migration(143 ± 8) in p53 wild-type Capan-2 cells transfected with Gli1siRNA were significantly decreased,compared with the siRNA control group (150 ± 7,190 ± 10) (t =6.584,P =0.022 ;t =8.266,P =0.014),while MDM2 silence inhibited cell invasion (experiment group:85 ± 12,control group:138 ± 6)and migration(experiment group:127 ± 9,control group:180 ± 10) in the same cells,respectively(t =5.097,P =0.036;t =4.860,P =0.040).However,cell invasion(experiment group:153 ± 11,control group:106 ± 7) and migration (experiment group:209 ± 13,control group:164 ± 8) in p53-silencing Capan-2 cells were significantly enhanced (t =4.669,P =0.043 ; t =4.990,P =0.038).IB showed that Gli1 silence down-regulated MMP-9 but not pERK and pAKT protein expression.Conclusion Gli1 might contribute to the cell invasion and migration in pancreatic cancer via the regulation of MDM2,p53 and MMP-9 expression.
出处
《中华外科杂志》
CAS
CSCD
北大核心
2014年第7期518-522,共5页
Chinese Journal of Surgery
基金
辽宁省教育厅高等院校优秀人才支持计划资助项目(2009R56)
辽宁省教育厅特聘教授专项资助项目([2012]512)
关键词
胰腺肿瘤
肿瘤侵润
肿瘤转移
脑胶质瘤相关癌基因-1
Pancreatic neoplasms
Neoplasm invasiveness
Neoplasm metastasis
Glioma-associated oncogene-1