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J Biol Chem, Vol. 275, Issue 8, 5779-5784, February 25, 2000
From the Various types of collagen have been identified as
potential ligands for the two mammalian discoidin domain receptor (DDR) tyrosine kinases, DDR1 and DDR2. It is presently unclear whether collagen-induced DDR receptor activation, which occurs with very slow
kinetics, involves additional proteins with kinase activity or
membrane-anchored proteins serving as coreceptors. In particular, the
role of the collagen-binding integrins
Discoidin Domain Receptor 1 Is Activated Independently of
1 Integrin*
§,
,

§§
Programme in Molecular Biology and Cancer,
Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto,
Ontario M5G 1X5, Canada, the ¶ Department of Experimental
Pathology, Lund University, 22185 Lund, Sweden, the
Department
of Hematology and Oncology, University of Göttingen,
37075 Göttingen, Germany, the ** Institute de Biologie et Chimie
des Proteines, CNRS, 69367 Lyon, France, and the

Department of Molecular and Medical
Genetics, University of Toronto, Toronto,
Ontario M5S 1A8, Canada
1
1 or
2
1 in the DDR activation process is
undefined. Here, we provide three lines of evidence suggesting that
DDR1 signaling is distinct from integrin activation. First we
demonstrate that the enzymatic activity of DDR1 is essential for
receptor tyrosine phosphorylation. Collagen-induced DDR receptor
autophosphorylation can be blocked either by a dominant negative mutant
or by a preparation of recombinant extracellular domain. Second, we
show DDR1 signals independent of the epidermal growth factor (EGF)
receptor. In cells that endogenously express both DDR1 and the EGF
receptor, stimulation with EGF does not induce DDR activation. Third,
we detected full DDR1 activation after collagen stimulation in cells
that have been treated with blocking antibodies for
2
1 integrin or in cells with a targeted deletion of the
1 integrin gene. Finally, we show that
overexpression of dominant negative DDR1 in the myoblast cell line
C2C12 blocks cellular differentiation and the formation of myofibers.
*
This work was supported by grants from the National Cancer
Institute of Canada, the Medical Research Council of Canada, the Protein Engineering Network of Centers of Excellence, and by an International Research Scholar Award from the Howard Hughes Medical Institute (to T. P.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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