Table 2. Assessment of Compounds 9 and 33 in Cell-Based Assays in Which WNT Signaling Is Activated at Distinct Levels by Inducible Expression of cDNAs Encoding Activating Components of the Canonical WNT Pathwaya.
IC50 (μM) |
|||
---|---|---|---|
WNT pathway activation level | reporter | 9 | 33 |
Dvl-ER (7dF3 primary assay) | TCF-luc | 1.76 | 0.037 |
Tet-O-ΔN-LRP6 | TCF-luc | 0.91 | 0.020 |
Tet-O-Dvl2 | TCF-luc | 1.20 | 0.020 |
Tet-O-Axin-GID | TCF-luc | 1.50 | 0.024 |
Tet-O-ΔN-β-catenin | TCF-luc | 2.73 | 0.070 |
Tet-O-VP16-TCF4 | TCF-luc | 7.61 | 0.23 |
Activating components of the canonical WNT pathway: ΔN-LRP6 (a constitutively activating component of the WNT receptor), Dvl-2 (a Disheveled homologue and activator of WNT signaling), Axin-GID (Axin-GSK3β Interaction Domain, a dominant negative form of Axin that binds to and inhibits GSK-3β), ΔN-β-catenin (a stabilized form of β-catenin resistant to degradation), or VP16-TCF (a TCF transcription factor that is constitutively active in the absence of β-catenin). See the Supplementary Information for assay protocols.