A common phosphotyrosine signature for the Bcr-Abl kinase

Blood. 2006 Jun 15;107(12):4888-97. doi: 10.1182/blood-2005-08-3399. Epub 2006 Feb 23.


The Bcr-Abl fusion kinase drives oncogenesis in chronic myeloid leukemia (CML). CML patients are currently treated with the Abl tyrosine kinase inhibitor imatinib, which is effective in early stages of the disease. However, resistance to imatinib arises in later disease stages primarily because of a Bcr-Abl mutation. To gain deeper insight into Bcr-Abl signaling pathways, we generated phosphotyrosine profiles for 6 cell lines that represent 3 Bcr-Abl fusion types by using immunoaffinity purification of tyrosine phosphopeptides followed by tandem mass spectrometry. We identified 188 nonredundant tyrosine-phosphorylated sites, 77 of which are novel. By comparing the profiles, we found a number of phosphotyrosine sites common to the 6 cell lines regardless of cellular background and fusion type, several of which are decreased by imatinib treatment. Comparison of this Bcr-Abl signature with the profile of cells expressing an alternative imatinib-sensitive fusion kinase, FIP1L1-PDGFRalpha, revealed that these kinases signal through different pathways. This phosphoproteomic study of the Bcr-Abl fusion kinase highlights novel disease markers and potential drug-responsive biomarkers and adds novel insight into the oncogenic signals driven by the Bcr-Abl kinase.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzamides
  • Biomarkers, Tumor / analysis
  • Biomarkers, Tumor / metabolism*
  • Drug Resistance, Neoplasm / drug effects
  • Fusion Proteins, bcr-abl / metabolism*
  • Humans
  • Imatinib Mesylate
  • K562 Cells
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / drug therapy
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / enzymology*
  • Oncogene Proteins, Fusion / metabolism
  • Phosphotyrosine / analysis
  • Phosphotyrosine / metabolism*
  • Piperazines / pharmacology*
  • Piperazines / therapeutic use
  • Protein Kinase Inhibitors / pharmacology*
  • Protein Kinase Inhibitors / therapeutic use
  • Proteomics
  • Pyrimidines / pharmacology*
  • Pyrimidines / therapeutic use
  • Receptor, Platelet-Derived Growth Factor alpha / metabolism
  • Signal Transduction / drug effects
  • mRNA Cleavage and Polyadenylation Factors / metabolism


  • Benzamides
  • Biomarkers, Tumor
  • Oncogene Proteins, Fusion
  • Piperazines
  • Protein Kinase Inhibitors
  • Pyrimidines
  • mRNA Cleavage and Polyadenylation Factors
  • Phosphotyrosine
  • Imatinib Mesylate
  • FIP1L1-PDGFRA fusion protein, human
  • Receptor, Platelet-Derived Growth Factor alpha
  • Fusion Proteins, bcr-abl