Bcr-Abl kinase modulates the translation regulators ribosomal protein S6 and 4E-BP1 in chronic myelogenous leukemia cells via the mammalian target of rapamycin.

Journal Article (Journal Article)

Identification of signaling pathways downstream of Abl tyrosine kinase may increase our understanding of the pathogenesis of chronic myelogenous leukemia (CML) and suggest strategies to improve clinical treatment of the disease. By combining the use of a phosphospecific antibody recognizing a substrate motif of serine/threonine kinases with bioinformatics, we found that the translational regulators ribosomal protein S6 and 4E-BP1 are constitutively phosphorylated in CML cells. Experiments with specific inhibitors indicated the phosphorylation is downstream of Bcr-Abl kinase and the mammalian target of rapamycin (mTOR). These results suggest that Bcr-Abl may regulate translation of critical targets in CML cells via mTOR. They also provide a rationale for testing the combination of mTOR inhibitors with the Abl kinase inhibitor imatinib in patients with CML. The mTOR inhibitor rapamycin enhanced imatinib-mediated killing of CML cell lines in vitro, and it overcame imatinib resistance in cells with Bcr-Abl gene amplification.

Full Text

Duke Authors

Cited Authors

  • Ly, C; Arechiga, AF; Melo, JV; Walsh, CM; Ong, ST

Published Date

  • September 15, 2003

Published In

Volume / Issue

  • 63 / 18

Start / End Page

  • 5716 - 5722

PubMed ID

  • 14522890

International Standard Serial Number (ISSN)

  • 0008-5472


  • eng

Conference Location

  • United States