miRNA and mRNA expression profiling identifies members of the miR-200 family as potential regulators of epithelial-mesenchymal transition in pterygium

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• 作者：David H. Engelsvold ; Tor P. Utheim ; Ole K. Olstad ; Pedro Gonzalez ; Jon R. Eidet ; Torstein Lyberg ; Anne-Marie S. Tr?seid ; Darlene A. Dartt ; Sten Raeder
• 关键词：pterygium ; gene microarray ; microRNA ; mRNA ; epithelial&ndash ; mesenchymal transition ; miR-200 family
• 刊名：Experimental Eye Research
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：115
• 期：Complete
• 页码：189-198
• 全文大小：2211 K

文摘

The current study investigates whether microRNA (miRNA) regulators of epithelial-mesenchymal transition (EMT), tissue fibrosis, and angiogenesis are differentially expressed in human primary pterygium. Genome-wide miRNA and mRNA expression profiling of paired pterygium and normal conjunctiva was performed in the context of conventional excision of pterygium with autotransplantation of conjunctiva (n?=?8). Quantitative real time polymerase chain reaction (qRT-PCR) was used to validate the expression of key molecules previously detected by microarray. In pterygium, 25 miRNAs and 31 mRNAs were significantly differentially expressed by more than two-fold compared to normal conjunctiva. 14 miRNAs were up-regulated (miR-1246, -486, -451, -3172, -3175, -1308, -1972, -143, -211, -665, -1973, -18a, 143, and -663b), whereas 11 were down-regulated (miR-675, -200b-star, -200a-star, -29b, -200b, -210, -141, -31, -200a, -934, and -375). Unsupervised hierarchical cluster analysis demonstrated that members of the miR-200 family were coexpressed and down-regulated in pterygium. The molecular and cellular functions that were most significant to the miRNA data sets were cellular development, cellular growth and proliferation, and cellular movement. qRT-PCR confirmed the expression of 15 of the 16 genes tested and revealed that miR-429 was down-regulated by more than two-fold in pterygium. The concerted down-regulation of four members from both clusters of the miR-200 family (miR-200a/-200b/-429 and miR-200c/-141), which are known to regulate EMT, and up-regulation of the predicted target and mesenchymal marker fibronectin (FN1), suggest that EMT could potentially play a role in the pathogenesis of pterygium and might constitute promising new targets for therapeutic intervention in pterygium.