(A) miR-27a-3p inhibitor increased RXRα and suppressed β-catenin, Frizzled-7, Dvl2, Dvl3, p-LRP6, Axin1, and GSK3β expression in HCT116 cells. However, RXRα knockdown reversed the suppression of β-catenin, Frizzled-7, Dvl2, Dvl3, p-LRP6, Axin1, and GSK3β expression in HCT116 cells by miR-27a-3p inhibitor. (B) miR-27a-3p mimic suppressed RXRα expression and increased β-catenin, Frizzled-7, Dvl2, Dvl3, p-LRP6, Axin1, and GSK3β expression in SW480 cells. (C) Ectopic RXRα suppressed β-catenin expression in HCT116 cells. (D) RXRα knockdown resulted in increased β-catenin protein level in SW480. (E) DKK1 dramatically reversed increased β-catenin, p-GSK3β, MMP9, c-Myc, cyclinD1, Axin1, Frizzled-7, p-LRP6, Dvl2, and Dvl3 in HCT116 with RXRα knockdown. (F) Wnt3a dramatically reversed suppressed β-catenin, p-GSK3β, MMP9, c-Myc, cyclinD1, Axin1, Frizzled-7, p-LRP6, Dvl2, and Dvl3 in SW480 transfected with RXRα expression plasmid.