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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The glycogen synthase kinase inhibitor 3-(2,4-dichlorophenyl)-4-(1-methyl-1H-indol-3-yl)-1H-pyrrole-2,5-dione (SB216763) is a partial agonist of the aryl hydrocarbon receptor.
Kinase inhibitors are frequently used tools in signal transduction research. 3-(2,4-Dichlorophenyl)-4-(1-methyl-1H-indol-3-yl)-1H-pyrrole-2,5-dione (SB216763), a potent inhibitor of glycogen synthase kinase 3beta (GSK3beta), is frequently used to activate beta-catenin signaling by mimicking the action of Wnt molecules. beta-Catenin is a crucial player in the regulation of hepatic drug metabolism. Thus, it is of particular importance to know whether the tools used to study the effects of beta-catenin signaling may affect the respective drug-metabolizing target enzymes in an unwanted manner. In this study, we show that SB216763 is able to induce cytochrome P450 1a1 (Cyp1a1) expression in a dose-dependent manner in mouse hepatoma cells. Moreover, SB216763 is able to inhibit Cyp1a1 induction by the prototype aryl hydrocarbon receptor (AhR) ligand 2,3,7,8-tetrachloro-p-dibenzodioxin. Cyp1a1 induction by SB216763 is independent of GSK3beta and the beta-catenin pathway. Instead, SB216763 induces Cyp1a1 by activation of AhR-mediated transcription. The present results suggest that SB216763 acts as a partial agonist of the AhR.
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