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Prepublished online as a Blood First Edition Paper on June 28, 2002; DOI 10.1182/blood-2001-11-0032. This Article Full Text Full Text (PDF) All Versions of this Article: 2001-11-0032v1 100/12/3968    most recent 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 Nishihara, H. Articles by Tanaka, S. Search for Related Content PubMed PubMed Citation Articles by Nishihara, H. Articles by Tanaka, S. Related Collections Hematopoiesis and Stem Cells Signal Transduction Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 December 2002, Vol. 100, No. 12, pp. 3968-3974 HEMATOPOIESIS DOCK2 associates with CrkL and regulates Rac1 in human leukemia cell lines Hiroshi Nishihara, Masae Maeda, Atsushi Oda, Masumi Tsuda, Hirofumi Sawa, Kazuo Nagashima, and Shinya Tanaka From the Laboratory of Molecular and Cellular Pathology, and the Laboratory of Environmental Biology, Hokkaido University School of Medicine, Sapporo, Japan; and CREST, Japan Science and Technology Corporation. The CDM (ced-5 of Caenorhabditis elegans, DOCK180 [downstream of Crk with molecular weight of 180 kDa] of humans, and myoblast city of Drosophila melanogaster) family of proteins has been shown to play a pivotal role in the integrin-mediated signaling pathway under the regulation of an adaptor molecule c-CT10-related kinase II (c-Crk-II) in adherent cells. Recently, hematopoietic cell-specific CDM protein DOCK2 has been shown to be indispensable for lymphocyte migration. However, the regulatory mechanism for DOCK2 is still unknown because DOCK2 lacks a c-Crk-II binding consensus motif. In this study, we demonstrated that DOCK2 bound to CrkL, which is present exclusively in hematopoietic cells both in vivo and in vitro, and we also found that 2 separate regions of DOCK2 contributed to its binding to Src homology 3 (SH3) domain of CrkL. Colocalization of DOCK2 with Crk-like (CrkL) and F-actin was shown by immunocytochemical analysis with the use of Jurkat cells. We also found that CrkL-induced activation of small guanine triphosphatase (GTPase) Rac1 was significantly inhibited by the DOCK2-dCS mutant in 293T cells. Furthermore, the association of DOCK2 and Vav, the guanine-nucleotide exchanging factor (GEF) for Rac1, was demonstrated in Jurkat cells. Finally, the stable expression of DOCK2-dCS mutant in Jurkat cells was shown to reduce cell attachment. These data suggest the presence of a novel protein complex of CrkL, DOCK2, and Vav to regulate Rac1 in leukemia cell lines. © 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: Q. Shen, J. J. Rahn, J. Zhang, N. Gunasekera, X. Sun, A. R.E. Shaw, M. J. Hendzel, P. Hoffman, A. Bernier, and J. C. Hugh MUC1 Initiates Src-CrkL-Rac1/Cdc42-Mediated Actin Cytoskeletal Protrusive Motility after Ligating Intercellular Adhesion Molecule-1 Mol. 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