目的 探讨Hedgehog/Gli促进胃癌AZ521细胞上皮-间质转化(EMT)的肿瘤分子学机制.方法 GANT61处理AZ521细胞24 h后,用实时荧光定量PCR法观察GANT61对Gli1、Gli2、N-cadherin和E-cadherin mRNA表达的影响;用Western blotting观察 GANT61对Gli1、Gli2、p-AKT、AKT、N-cadherin和E-cadherin蛋白表达的影响;用侵袭实验观察GANT61对胃癌细胞迁移侵袭能力的影响;同时,应用N-Shh刺激Hedgehog通路观察相应指标的变化.结果 与对照组相比,GANT61组胃癌AZ521细胞的Gli1、 Gli2、N-cadherin mRNA表达显著下调,E-cadherin mRNA表达上调;Western blotting结果显示GANT61可以下调AZ521的Gli1、Gli2、 p-AKT、N-cadherin蛋白表达,上调E-cadherin蛋白表达.侵袭实验结果显示GANT61可以显著抑制AZ521细胞的侵袭能力.应用 N-Shh可以显著上调Gli1、Gli2、N-cadherin mRNA和蛋白表达以及p-AKT蛋白表达,下调E-cadherin mRNA及蛋白表达,促进肿瘤细胞侵袭转移. 结论 Gli1和Gli2表达下调可以抑制胃癌细胞的侵袭转移,可能与Gli通过PI3K/AKT途径促进EMT有关.%Objective To investigate the tumor molecular mechanism of Hedgehog/Gli in promoting the epithelial-mesenchymal transition (EMT) in gastric cancer AZ521 cells. Methods After 24 h of treatment with GANT61,the mRNA expression of Gli1,Gli2, N-cadherin,and E-cadherin in the AZ521 cell line were detected by real-time fluorescence quantitative PCR. A Western blotting assay was conducted to determine the expression of the above cytokines,p-AKT and AKT. The effect of GANT61 on invasion was observed by transwell assay. N-Shh stimulation of the Hedgehog pathway was conducted to confirm the changes in these cytokines. Results GANT61 significantly downregulated the mRNA expression of Gli1,Gli2,and N-cadherin,but upregulated E-cadherin mRNA expression. The Western blotting assay revealed that GANT61 downregulated the protein expression of Gli1,Gli2,p-AKT,and N-cadherin,but upregulated E-cadherin expression. Furthermore,GANT61 inhibited the invasion. N-Shh proteins up-regulated Gli1,Gli2,and N-cadherin mRNA,protein expression and p-AKT protein expression,but downregulated E-cadherin mRNA and protein expressions. N-Shh promoted the invasion of tumor cells. Conclusion Downregulation of Gli1 and Gli2 can inhibit the invasion and metastasis in gastric cancer cells,which may be related to the promotion of EMT by Gli through the PI3K/AKT pathway.
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