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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Signal 2009 ; 2 (72): ra25 Nephropedia Template TP
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Bruton?s Tyrosine Kinase Revealed as a Negative Regulator of Wnt??-Catenin Signaling #MMPMID19471023
James RG; Biechele TL; Conrad WH; Camp ND; Fass DM; Major MB; Sommer K; Yi X; Roberts BS; Cleary MA; Arthur WT; MacCoss M; Rawlings DJ; Haggarty SJ; Moon RT
Sci Signal 2009[]; 2 (72): ra25 PMID19471023show ga
Wnts are secreted ligands that activate several receptor-mediated signal transduction cascades. Homeostatic Wnt signaling through ?-catenin is required in adults, because either elevation or attenuation of ?-catenin function has been linked to diverse diseases. To contribute to the identification of both protein and pharmacological regulators of this pathway, we describe a combinatorial screen that merged data from a high-throughput screen of known bioactive compounds with an independent focused small interfering RNA screen. Each screen independently revealed Bruton?s tyrosine kinase (BTK) as an inhibitor of Wnt??-catenin signaling. Loss of BTK function in human colorectal cancer cells, human B cells, zebrafish embryos, and cells derived from X-linked agammaglobulinemia patients with a mutant BTK gene resulted in elevated Wnt??-catenin signaling, confirming that BTK acts as a negative regulator of this pathway. From affinity purification?mass spectrometry and biochemical binding studies, we found that BTK directly interacts with a nuclear component of Wnt??-catenin signaling, CDC73. Further, we show that BTK increased the abundance of CDC73 in the absence of stimulation and that CDC73 acted as a repressor of ?-catenin-mediated transcription in human colorectal cancer cells and B cells.