沉默CDC25A基因后肝癌裸鼠移植瘤组织中差异表达基因的筛选

Screen of differentially expressed genes in liver cancer xenograft tissues after CDC25A gene silence

目的:探讨应用基因芯片技术筛选出可能受细胞分裂周期因子25A(cell division cycle 25A,CDC25A)调控的基因,阐明并验证CDC25A对肝癌相关基因的表达具有调控作用。方法:本课题组前期通过siRNA干扰技术沉默人肝癌HepG2细胞中CDC25A的表达并成功构建了肝癌裸鼠移植瘤模型。基于上述研究成果,在本研究中应用Affymetrix基因表达谱芯片技术进一步筛选沉默CDC25A后肝癌移植瘤组织中的差异表达基因,并进行GO及KEGG分析,应用qPCR对部分差异表达基因进行验证。结果:通过芯片技术筛选出沉默CDC25A基因的肝癌移植组织中的差异表达基因188个,其中上调基因78个、下调基因110个。这些差异表达基因主要涉及细胞增殖、细胞凋亡、蛋白复合物结合、细胞外间隙等方面,参与黏着斑、细胞外基质(extracellular matrix,ECM)受体相互作用等通路的改变。q PCR对部分差异表达基因验证的结果显示,HIPK2 mRNA表达上调,微纤丝关联蛋白5(microfibrillar-associated protein 5,MFAP5)和细胞周期蛋白D1(cyclin D1,CCND1)mRNA表达下调,与芯片检测结果一致。结论:应用人基因表达谱芯片技术成功筛选出沉默CDC25A后肝癌裸鼠移植瘤组织中的差异表达基因,为探究CDC25A影响肝癌细胞生长提供了支持线索。

Objective: To explore the genes that may be regulated by cell division cycle 25 A(CDC25 A) with gene chip technology,and to elucidate and verify that CDC25 A has a regulatory effect on the expression of liver cancer related genes. Methods: CDC25 A expression in human liver cancer HepG2 cells was silenced by siRNA interference technology and a nude mouse xenograft model of liver cancer was successfully constructed in our previous research. Affymetrix human gene expression profiling microarray was used to further screen differentially expressed genes(DEGs) after silencing CDC25 A in liver cancer xenografts, and GO analysis and KEGG analysis were performed. Some of the DEGs were verified by qPCR. Results: The chip screened 188 DEGs in liver cancer xenograft tissues after CDC25 A silence, including 78 up-regulated genes and 110 down-regulated genes. These DEGs mainly involved in cell proliferation, apoptosis, protein complex binding, extracellular space, etc., and associated with the changes in pathways such as focal adhesions and extracellular matrix(ECM) receptor interactions. q PCR showed that the expression of HIPK2 mRNA was up-regulated and the mRNA expressions of(microfibrillar-associated protein 5(MFAP5) and cyclin D1(CCND1) were down-regulated, which were consistent with the results of microarray detection. Conclusion: Using human gene expression profiling chip, the DEGs in liver cancer xenograft tissues in nude mice after silencing CDC25 A were successfully screened, providing effective clues for exploring the effect of CDC25 A on the growth of liver cancer.