BackgroundThe remodeling of maternal spiral artery following embryo implantation, which relies on wellâregulated trophoblast functions, is a pivotal process to ensure a successful pregnancy. Lowâdensity lipoprotein receptorârelated protein 6 (LRP6) and microRNAs (miRNAs, miRs) are suggested to be involved in angiogenesis and several vascular diseases; however, their functions in the control of trophoblast remain elusive. We therefore aimed to examine the roles of LRP6 and miRâ590â3p in the regulation of trophoblast during the remodeling of maternal spiral artery.MethodsHTRâ8/SVneo cell, a trophoblast cell line, was utilized to study the effects of LRP6 and miRâ590â3p on apoptosis, cell proliferation, migration, invasion, as well as tube formation. Expression of angiogenic factors placental growth factor (PlGF), matrix metalloproteinases (MMPs), vascular endothelial growth factor (VEGF), and activities of canonical Wnt/βâcatenin signaling pathway, which were implicated in the process of artery remodeling, were also examined.ResultsMiRâ590â3p directly targeted 3Ⲡuntranslated region (3â˛âUTR) of LRP6 mRNA and repressed LRP6 expression, which in turn inhibited proliferation, migration, invasion, as well as tube formation, and resulted in apoptosis in HTRâ8/SVneo cells. Further, inhibition of LRP6 through miRâ590â3p significantly suppressed the expression of PlGF, MMPs, and VEGF and reduced the activation of Wnt/βâcatenin signaling pathway.ConclusionMicroRNAsâ590â3p may inhibit trophoblastâdependent maternal spiral artery remodeling, via both trophoblast invasion and endovascular formation, by repressing LRP6.