Involvement of Lgals3/Galectin-3 in Choroidal Neovascularization and Subretinal Fibrosis Formation.

Background:Lgals3/galectin-3 plays a pivotal role in many vascular diseases. However, the involvement of Lgals3/galectin-3 in eyes with neovascular age-related macular degeneration (nAMD) remains unknown. Methods: In the laser-induced CNV model, a whole mount retina stained with Isolectin B4 and collagen type I revealed the vascular bed and CNV-associated subretinal fibrosis on day 7 after laser treatment. Results: We show that the expression levels of Lgals3/galectin-3 were significantly increased in the RPE/choroidal complex of CNV mice. An intravitreal injection of Lgals3-siRNA significantly suppressed the area of CNV and subretinal fibrosis, together with Mcp-1 decline. The mixture of Lgals3-siRNA and Ranibizumab showed more efficiency than each drug used separately. Hypoxia induced Lgals3/galectin-3 production in ARPE-19 cells, which was reduced by the silencing hypoxia-inducible factor -1α (Hif-1a). Conclusions: Our data indicated that Lgals3/galectin-3 is involved in the pathogenesis of CNV and subretinal fibrosis, and Lgals3/galectin-3 could be a potential therapeutic target for nAMD.