A common phosphotyrosine signature for the Bcr-Abl kinase.
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.
Cell Signaling Technology, 3 Trask Ln, Danvers, MA 01923, USA.
Valerie L
VL
Goss
Kimberly A
KA
Lee
Albrecht
A
Moritz
Julie
J
Nardone
Erik J
EJ
Spek
Joan
J
MacNeill
John
J
Rush
Michael J
MJ
Comb
Roberto D
RD
Polakiewicz
D001549:Benzamides; D014408:Biomarkers, Tumor / Q000032:analysis / Q000378:metabolism*; D019008:Drug Resistance, Neoplasm / Q000187:drug effects; D016044:Fusion Proteins, bcr-abl / Q000378:metabolism*; D006801:Humans; D000068877:Imatinib Mesylate; D020014:K562 Cells; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy / Q000201:enzymology*; D015514:Oncogene Proteins, Fusion / Q000378:metabolism; D019000:Phosphotyrosine / Q000032:analysis / Q000378:metabolism*; D010879:Piperazines / Q000494:pharmacology* / Q000627:therapeutic use; D047428:Protein Kinase Inhibitors / Q000494:pharmacology* / Q000627:therapeutic use; D040901:Proteomics; D011743:Pyrimidines / Q000494:pharmacology* / Q000627:therapeutic use; D020796:Receptor, Platelet-Derived Growth Factor alpha / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D039221:mRNA Cleavage and Polyadenylation Factors / Q000378:metabolism
D001549:Benzamides; D014408:Biomarkers, Tumor; D015514:Oncogene Proteins, Fusion; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011743:Pyrimidines; D039221:mRNA Cleavage and Polyadenylation Factors; D019000:Phosphotyrosine; D000068877:Imatinib Mesylate; C479819:FIP1L1-PDGFRA fusion protein, human; D020796:Receptor, Platelet-Derived Growth Factor alpha; D016044:Fusion Proteins, bcr-abl