In vitro activity: ICG-001 has no effect on the related reporter construct, FOPFLASH, which contains mutated TCF sites. After treatment with 25μM of ICG-001 for 8 hours, SW480 cell reduces the steady-state levels of Survivin and Cyclin D1 RNA and protein, both of which can be up-regulated by β-catenin. ICG-001 selectively induces apoptosis in transformed cells but not in normal colon cells, reduces in vitro growth of colon carcinoma cells. ICG-001, can phenotypically rescue normal nerve growth factor (NGF) -induced neuronal differentiation and neurite outgrowth in the presenilin-1 mutant cells, emphasizing the importance of the TCF/β-catenin signaling pathway on neurite outgrowth and neuronal differentiation. A recent study demonstrates that 5μM ICG-001 inhibits leptin-induced EMT, invasion and tumorsphere formation in MCF7 cells.

Kinase Assay: The Dual-Luciferase Reporter (DLR) Assay System provides an efficient means of performing dual reporter assays. In the DLRTM Assay, the activities of firefly (Photinus pyralis) and Renilla (Renilla reniformis, also known as sea pansy) luciferases are measured sequentially from a single sample. The firefly luciferase reporter is measured first by adding Luciferase Assay Reagent II (LAR II) to generate a “glow-type” luminescent signal. After quantifying the firefly luminescence, this reaction is quenched, and the Renilla luciferase reaction is initiated by simultaneously adding Stop & Glo(R) Reagent to the same tube. The Stop & Glo(R) Reagent also produces a “glow-type” signal from the Renilla luciferase, which decays slowly over the course of the measurement. In the DLRTM Assay System, both reporters yield linear assays with subattomole (<10-18) sensitivities and no endogenous activity of either reporter in the experimental host cells. Furthermore, the integrated format of the DLRTM Assay provides rapid quantitation of both reporters either in transfected cells or in cell-free transcription/translation reactions.

Cell Assay: The rat EMCs were treated with either ICG-001 or IQ1 and performed co-immunoprecipitation (co-IP) assays. Cells were treated with DMSO, ICG-001 or IQ1 for 24 hours. In the DMSO control treated cells, essentially all of the β-catenin was associated with CBP. Treatment with IQ1 had minimal effects on β-catenin coactivator usage. However, as anticipated, treatment with ICG-001 decreased the β-catenin/CBP interaction, while concomitantly increasing the β-catenin/p300 interaction.

Proc Natl Acad Sci U S A. 2004 Aug 24;101(34):12682-7; Proc Natl Acad Sci U S A. 2010 Aug 10;107(32):14309-14.