Bcr-Abl stabilizes beta-catenin in chronic myeloid leukemia through its tyrosine phosphorylation

Self-renewal of Bcr-Abl() chronic myeloid leukemia (CML) cells is sustained by a nuclear activated serine/threonine-(S/T) unphosphorylated beta-catenin. Although b-catenin can be tyrosine (Y)-phosphorylated, the occurrence and biological relevance of this covalent modification in Bcr-Abl-associated leukemogenesis is unknown. Here we show that Bcr-Abl levels control the degree of beta-catenin protein stabilization by affecting its Y/S/T-phospho content in CML cells. Bcr-Abl physically interacts with beta-catenin, and its oncogenic tyrosine kinase activity is required to phosphorylate b-catenin at Y86 and Y654 residues. This Y-phospho beta-catenin binds to the TCF4 transcription factor, thus representing a transcriptionally active pool. Imatinib, a Bcr-Abl antagonist, impairs the beta-catenin/TCF-related transcription causing a rapid cytosolic retention of Y-unphosphorylated b-catenin, which presents an increased binding affinity for the Axin/GSK3b complex. Although Bcr-Abl does not affect GSK3b autophosphorylation, it prevents, through its effect on b-catenin Y phosphorylation, Axin/GSK3b binding to b-catenin and its subsequent S/T phosphorylation. Silencing of b-catenin by small interfering RNA inhibited proliferation and clonogenicity of Bcr-Abl() CML cells, in synergism with Imatinib. These findings indicate the Bcr-Abl triggered Y phosphorylation of b-catenin as a new mechanism responsible for its protein stabilization and nuclear signalling activation in CML.