应用基因微阵列初步研究风湿性心脏病所致心力衰竭的基因表达谱

目的:应用基因微阵列研究分析风湿性心脏病所致心力衰竭(风心病心衰)患者以及正常成人的左心室心肌基因表达谱,筛选出风心病心衰相关靶基因.方法:采用6张人类全基因组微阵列HG U133 Plus 2.0 GeneChip,分别构建风心病心衰患者(实验组n=15)与正常对照组(n=9)的左心室乳头肌基因表达谱.运用GeneSpring软件筛选出两组间差异表达基因,作为风心病心衰相关靶基因,并进行生物信息学分析.采用实时荧光定量多聚酶链反应(Real-time PCR),对其中3个靶基因进行验证.结果:确定102个风心病心衰相关靶基因,并将它们归入7个风心病心衰相关基因群.实时荧光定量多聚酶链反应检测证实,风心病心衰患者左心室心肌内,基因NPPB与IGFBP2明显上调,ATF3明显下调,与基因微阵列实验结果非常吻合,说明基因微阵列实验结果可靠.结论:风心病心衰发生发展过程中存在众多基因表达的改变,全基因组表达谱的研究有助于认识该综合征的发病机制.对风心病心衰相关靶基因的深入研究,有助于揭示该综合征发病学上的遗传标志以及分子机制.

Preliminary Study of Microarray Gene Expression Profiles in Chronic Congestive Heart Failure due to Rheumatic Heart Disease

Objective:To analyze gene expression profiling of left ventricular myocardium in patients with chronic congestive heart failure(CHF)caused by rheumatic heart disease(RHD)with the normal controls in order to identify CHF associated target genes. Methods:The gene expression profiles of left ventricular myocardium from patients with CHF by RHD and normal controls were obtained from six human whole-genomic oligonucleotide microarrays(Affymetrix HG U133 Plus 2.0 GeneChip). GeneSpring software was used to identify the differentially expressed genes in both groups,and bioinformatic analysis was applied to analyze the target genes associated with CHF. Real-time PCR was carried out to validate the expression of three target genes. Results:We identified 102 target genes associated with CHF which were classified into 7 gene clusters. Microarray results were further confirmed by real time PCR for three genes. ATF3 was markedly down-regulated,IGFBP2 and NPPB were notably up-regulated in the left ventricular myocardium samples from CHF patients. Conclusion:A lot of differentially expressed genes,obtained by using the whole-genomic expression profiling technology,might be a contributory factor for the initiation and progression of CHF and it helpful for the understanding of underlying pathophysiological implications. Further investigation on these genes would provide a strategy to identify genetic markers and molecular events associated with CHF caused by RHD.