摘要目的 研究胃癌患者外周血微小核糖核酸(miRNA)的表达,初步建立胃癌特征性的循环miRNA表达谱,为深入研究miRNA与胃癌发生、发展并寻找新的分子标志物提供依据.方法 选取6例胃癌患者和6例健康体检者,提取外周血总RNA,进行miRNA表达谱检测和生物信息学分析,采用实时定量PCR技术对芯片检测结果进行验证,对筛选出的显著差异表达miRNA的靶基因进行预测.结果 胃癌组与对照组对比共有54个差异表达miRNA,其中表达上调的miRNA为35个(miRNA-504、miRNA-183、miRNA-938、miRNA-1285、miRNA-576-3p、miRNA-663 等),表达下调的miRNA为19个(miRNA-433、miRNA-193b、miRNA-329、miRNA-409-3p、miRNA-154等).实时定量PCR对其中2个上调miRNA(miRNA-504和miRNA-183)和2个下调miRNA(miRNA-433和miRNA-193b)的验证结果与芯片检测结果间具有较好的一致性.结论 胃癌患者外周血中具有特异性的miRNA表达谱,这些差异表达的miRNA有可能成为新的胃癌诊断分子标志物.

abstractsObjective To explore the peripheral blood microRNA (miRNA) expression of patients with gastric cancer,and to establish specific peripheral blood miRNA expression profile of gastric cancer,which would provide the evidencc for investigating the role of miRNA in the genesis and development of gastric cancer and looking for new molecular markers of gastric cancer.Methods A total of 6 gastric cancer patients and 6 healthy volunteers were selected.The totat RNA of peripheral blood was extracted for miRNA expression profile examination and hioinformation analysis. The results of microarray were verified by real-time PCR. The online miRNA target gene pr(e)diction software was used to predict and screen miRNA differentially expressed target genes. Results Compared with control group,there were 54 differentially expressed miRNA in gastric cancer group,of which the expression of 35 miRNA (miRNA-504,mi RNA-183,miRNA- 938,miRNA-1285,miRNA- 576-3p,miRNA-663,etc) were up-regulated and 19 miRNA (miRNA-433,miRNA-193b,miRNA-329,miRNA 409-3p,miRNA 154,el(e)) were down-regulated.The results of real-time PCR indicated that there was a good consistency between PCR verificd results and microarray results in 2 up-regulated miRNA (miRNA 504 and miRNA-183) and 2 down-regulated miRNA (miRNA-443 and miRNA- 193b).Conclusion There is specific peripheral blood miRNA expression profile of patients with gastric cancer,and these differentially cxpressed miRNA will likely become new diagnostic biomarkers of gastric cancer.