Calcipotriol mediates inhibition of Wnt signaling through VDR. (A) Dose response curve for calcipotriol on Wnt signaling as measured at 24 hours in AsPC-1 cells with stable BAR-luciferase reporter. (B) AXIN2 expression measured by qPCR at 24 hours following treatment with vehicle or 100 nM (AsPC-1), 5 μM (YAPC) or 1 μM (HPAF-2 and Suit2) calcipotriol. (C) VDR, LRP6 and tubulin (loading control) western blots and (D) BAR-luciferase activity for AsPC-1 transfected with either control or VDR siRNA for 48 hours and an additional 24 hour treatment with vehicle or 100 nM calcipotriol. All values were normalized to respective controls, with BAR reported as mean ± SD and qPCR reported as mean ± SEM. One representative experiment from at least three biological repeats is shown. *P<0.05, **P<0.01, ***P<0.001.