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The purpose of this study was to identify the role of ephrin\u2010A5 (Efna5) in RNV and to explore its mechanism. The expression pattern and biological significance of Efna5 were investigated in a mouse model of oxygen\u2010induced retinopathy (OIR). The expression of Efna5 and downstream signaling pathway members was determined by RT\u2010PCR, immunofluorescence, immunohistochemistry, and western blot analyses. shRNA was used to knockdown Efna5 in the retina of the OIR mouse model. Retinal flat mounts were performed to evaluate the impact of Efna5 silencing on the RNV process. We found that the Efna5 was greatly upregulated in the retina of OIR mice. Elevated Efna5 mainly colocalized with the retinal vessels and endothelial cells. We then showed that knockdown of Efna5 in OIR mouse retinas using lentivirus\u2010mediated shRNA markedly decreased the expression of Efna5 and reduced the retinal neovascularization and avascular retina area. We further showed hypoxia stimulation dramatically increased both total and phosphorylation levels of ERK1\/2 and the phosphorylation levels of Akt in OIR mice. More importantly, knockdown of Efna5 could inhibit the p\u2010Akt and p\u2010ERK signaling pathways. Our results suggested that Efna5 may regulate the RNV. This study suggests that Efna5 was significantly upregulated in the retina of OIR mice and closely involved in the pathological retinal angiogenesis.<\/jats:p>","DOI":"10.1155\/2020\/7161027","type":"journal-article","created":{"date-parts":[[2020,10,11]],"date-time":"2020-10-11T12:55:30Z","timestamp":1602420930000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Ephrin\u2010A5 Is Involved in Retinal Neovascularization in a Mouse Model of Oxygen\u2010Induced 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