中文摘要：

目的：应用mi RNA表达谱芯片筛选视网膜色素上皮细胞与氧化应激相关的mi RNA,为更加全面深入地研究年龄相关性黄斑病变（age-related macular degeneration,AMD）发生的分子机制提供新的思路。方法：培养D407细胞,分别使用100、200、400μmol/LH2O2处理细胞24h后,Trizol试剂抽提细胞总RNA,使用Exiqon mi RCURY LNATMmicro RNA表达谱芯片（mi RBase16.0数据库）检测不同浓度处理后D407细胞mi RNA的表达差异,并将不同浓度处理后的变化进行聚类分析。使用Stem loop realtime PCR对芯片结果进行验证,并运用生物信息学方法预测差异mi RNA调控的靶基因。结果：芯片所包含的1425个已知mi RNA中,共有367个在不同浓度H2O2处理后表达发生变化。通过Treeview软件进行聚类分析发现mi R-31等17个mi RNA随H2O2浓度的升高呈现逐渐降低的趋势,mi R-206等7个则逐渐升高。PCR验证显示芯片结果准确性较好。结论：H2O2作用前后RPE的mi RNA表达存在明显差异,mi RNA作为转录后水平的调节分子,参与了细胞氧化应激反应,可能在AMD的发生发展中起有重要作用。

英文摘要：

AIM： To identify the oxidative stress related miRNA in retinal pigment epithelium （RPE） by miRNA expression profile chip and provide a new idea for comprehensive and deep research on the molecular mechanisms of agerelated macular degeneration （AMD）. METHODS： Human RPE cell line D407 was treated by 100,200, 4001J mol/L H2O2 for 24h and harvested to isolate total RNA by Trizol reagent. The expression difference of 13407 cell miRNA after processing of different concentrations was generated by Exiqon miRCURY LNATM microRNA expression profile chip and the changes after processing of different concentrations were conducted by Hierarchical Clustering analysis. The results of chips were verified through Stem loop realtime PCR, and the target genes of identified miRNAs were predicted by bioinformatics software. RESULTS： Among the 1425 known miRNAs listed on microarray, 367 miRNAs showed differential expression after H2O2 treatment. The Treeview Clustering showed that 17 miRNAs, including miR-31, were downregulated along with the increase of H2O2 concentration. Meanwhile, 7 miRNAs, including miR206, were upregulated. The results of qRT-PCR further validated the better results of microarray. CONCLUSION.The miRNA expression of human RPE is dramatically changed after H202 treatment, miRNA adjusts the molecules level of micrornas transcription and it is involved in cell oxidative stress reaction, and miRNA may play a pivotal role in the pathogenesis and development of AMD.