Wnt signaling activity was measured using HEK293 cells containing a luciferase gene controlled by a Wnt-responsive promoter (Super TopFlash reporter assay), as previously reported26. In brief, cells were seeded at a density of 10,000 per well in 96-well plates 24 h prior to treatment at the presence of 3 μM IWP2 to inhibit the production of endogenous Wnt ligands. Recombinant WNT3A (R&D systems) was used as a positive control. Cells were lysed with Luciferase Cell Culture Lysis Reagent (Promega), and activity was measured with the Luciferase Assay System (Promega), using vendor suggested procedures. Data were plotted as average −/+ standard deviation of triplicates and fitted by non-linear regression using Prism (GraphPad Software, San Diego, CA).
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