Abstract
Long non-coding RNA (lncRNA) maternally expressed gene 3 (MEG3) has been identified as a regulatory molecule in angiogenesis. The goal of this study was to illustrate how MEG3 affects the angiogenesis of vascular endothelial cells. Expression of MEG3, miR-147 and intracellular cell adhesion molecule-1 (ICAM-1) in human microvascular endothelial cell line (HMEC-1) was altered by transfection, then cell viability, apoptosis, migration, tube formation, as well as the correlation among MEG3, miR-147 and ICAM-1 were explored. MEG3 was down-regulated during tube formation of HMEC-1 cells. MEG3 expression suppressed cells viability, migration and tube formation, while it induced apoptosis. MEG3 could bind with miR-147 and repress miR-147 expression. MiR-147 induced ICAM-1 expression, and contained ICAM-1 target sequences. The anti-atherogenic actions of MEG3 were inhibited by miR-147, and the anti-atherogenic actions of miR-147 suppression were also inhibited when ICAM-1 was overexpressed. Further, ICAM-1 overexpression showed activated roles in Wnt/β-catenin and Jak/Stat signaling pathways. In low-density lipoprotein receptor (Ldlr)−/− mice, MEG3 overexpression reduced CD68+, CD3+ and ICAM-1 areas in lesions and increased collagen content. MEG3 inhibited HMEC-1 cell growth, migration and tube formation. The anti-atherogenic actions of MEG3 might be mediated via sponging miR-147, and thereby repressing the expression of ICAM-1.
Conflict of interest statement: The authors declare that they have no conflict of interest regarding this study.
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