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This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Wertheim, J. A. Articles by Pear, W. S. Search for Related Content PubMed PubMed Citation Articles by Wertheim, J. A. Articles by Pear, W. S. Related Collections Oncogenes and Tumor Suppressors Signal Transduction Neoplasia Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 June 2002, Vol. 99, No. 11, pp. 4122-4130 NEOPLASIA BCR-ABL-induced adhesion defects are tyrosine kinase-independent Jason A. Wertheim, Kevin Forsythe, Brian J. Druker, Daniel Hammer, David Boettiger, and Warren S. Pear From the Department of Bioengineering, Institute for Medicine and Engineering, Department of Pathology and Laboratory Medicine, and Department of Microbiology, University of Pennsylvania, Philadelphia; and Division of Hematology and Medical Oncology, Department of Cell and Developmental Biology and Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland. The t(9;22) chromosomal translocation results in expression of P210BCR-ABL, a fusion protein necessary for the development of chronic myelogenous leukemia (CML). The constitutive activation of the P210BCR-ABL tyrosine kinase results in phosphorylation of multiple signaling pathways leading to the transformed phenotype. Additionally, extracellular interactions between P210BCR-ABL-expressing progenitor cells and bone marrow stroma may provide external signals that facilitate CML development. In contrast to the intracellular signaling pathways involved in CML, little is known about how P210BCR-ABL expression modifies cell-cell and cell-substratum interactions. To investigate the role of P210BCR-ABL in modulating cellular adhesion, we used a highly sensitive and quantitative cell detachment apparatus that measures the strength of association between a population of cells and an adhesive matrix. Our findings show that P210BCR-ABL expression increased adhesion nearly 2-fold between the myeloblastic cell line, 32D, and fibronectin compared to a control vector. We then investigated whether abnormal adhesion due to P210BCR-ABL expression was caused by its tyrosine kinase activity. A quantitative analysis of cell-fibronectin adhesion found that neither expression of a kinase-inactive P210BCR-ABL mutant in 32D cells or attenuation of kinase activity by STI571 (imatinib mesylate) in 32D cells transduced with wild-type P210BCR-ABL could correct the nearly 2-fold increase in cell-fibronectin adhesion. Similarly, STI571 treatment of Meg-01 cells, a P210BCR-ABL-expressing cell line derived from a patient in blast crisis, failed to inhibit adhesion to fibronectin. Together, our results indicate that changes in adhesion induced by P210BCR-ABL are independent of its tyrosine kinase activity. © 2002 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: K. Eto, H. Nishikii, T. Ogaeri, S. Suetsugu, A. Kamiya, T. Kobayashi, D. Yamazaki, A. Oda, T. Takenawa, and H. 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