低压低氧暴露条件下肺动脉高压大鼠循环microRNA表达及其意义
The expression and significance of circulating microRNA of rats with hypobaric hypoxia-induced pulmonary hypertension

摘要：目的 研究低压低氧暴露条件下肺动脉高压(HPH)模型大鼠循环microRNA(miRNA)表达的变化。方法 利用基因芯片技术定量检测、分析HPH组及对照组大鼠血清中潜在的循环miRNA的表达及其差异。基于病例-对照设计，采用荧光定量PCR技术对差异化表达miRNA进行验证。受试者工作特征曲线(ROC)分析测试4种差异化表达miRNA对HPH组及对照组的鉴别效能。结果 与对照组比较，HPH组大鼠13种miRNA表达上调，10种miRNA表达下调，其中，荧光定量PCR初步证实miR-451、miR-505及let-7d表达上调，而miR-214表达下调。ROC分析结果显示，miR-451、miR-505及let-7d用于鉴别HPH组大鼠和对照组大鼠的曲线下面积(AUC)分别为0.979、0.938和0.993。结论 低压低氧暴露条件下HPH组大鼠与对照组大鼠循环miRNA的表达存在显著差异，提示血清miRNA差异化表达可能与HPH病理变化相关。
ABSTRACT: Objective To investigate the expression of circulating microRNA (miRNA) of rats with hypobaric hypoxia-induced pulmonary hypertension (HPH). Methods Commercial rat miRNA microarray was employed to detect and analyze the circulating miRNA profile in the serum samples of Sprague-Dawley rats with hypobaric hypoxia-induced HPH and controls. Furthermore, differentially expressed candidate circulating miRNAs between HPH and control groups were validated by Real-time quantitative PCR based on the case-control study, and receiver operating characteristic curve (ROC) analysis was used to test the performance of four differentially expressed circulating miRNAs in discriminating HPH and control groups. Results Compared with those in the control group, 13 upregulated miRNAs and 10 downregulated miRNAs were identified in hypobaric hypoxia-induced HPH rats by using miRNA microarray. And differentially expressed miR-451, miR-505, let-7d and miR-214 were validated by using RT-PCR. ROC analysis showed that the area under the curve of miR-451, miR-505 and let-7d was 0.979, 0.938 and 0.993 in discriminating HPH and control groups, respectively. Conclusion The aberrant expression of circulating miR-451, miR-505 and let-7d in serum may be correlated with the pathogenesis of HPH