Figure 9. Potential pathways that contribute to embryo implantation through HIF.
(A) Stromal HIF releases luminal epithelium from stroma through LOX and MT2-MMP, which permits direct contact between stroma and trophoblast. (B) Stromal HIF activates PI3K-AKT pathway as a trophoblast survival signal pathway through the induction of LOX, VEGF, and ADM, which promotes embryo invasion.