Highly potent and isoform selective dual site binding tankyrase/Wnt signaling inhibitors that increase cellular glucose uptake and have antiproliferative activity

Abstract Compounds 𝟏𝟑 and 𝟏𝟒 were evaluated against eleven PARP isoforms to reveal that both 𝟏𝟑 and 𝟏𝟒 were more potent and isoform-selective towards inhibiting tankyrases (TNKSs) than the “standard” inhibitor 𝟏 (XAV939)⁵, i.e. IC₅₀ = 100 pM vs. TNKS2 and IC₅₀ = 6.5 μM vs. PARP1 for 𝟏𝟒. In cellular assays, 𝟏𝟑 and 𝟏𝟒 inhibited Wnt-signaling, enhanced insulin-stimulated glucose uptake and inhibited the proliferation of DLD-1 colorectal adenocarcinoma cells to a greater extent than 𝟏