RORα negatively regulated SEMA3E in OIR. A, B) In OIR model, Rora mRNA was expressed in WT retina but was barely detectable in Sg/Sg OIR retinas, confirming RORα deficiency in Sg/Sg eyes (A). Both mRNA (n = 6/group; A) and protein (n = 4/group; B) levels of Sema3e were significantly up-regulated in Sg/Sg OIR retinas compared with littermate WT controls at P17. C) There was no significant change in the mRNA expression levels of Sema3a, -c, and -f in Sg/Sg OIR retinas compared with WT retinas except for Sema3d mRNA level, which was induced as well in Sg/Sg eyes with OIR. Data are presented as means ± sem (n = 3/group). N.s., no significance; NV, neovascularization; VO, vaso-obliteration. **P < 0.01, ***P < 0.001.