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J Biol Chem, Vol. 274, Issue 13, 8624-8629, March 26, 1999
From the Cripto-1 (CR-1) is a recently discovered protein
of the epidermal growth factor family that fails to directly bind to
any of the four known erb B type 1 receptor tyrosine
kinases. The present study demonstrates that CR-1 indirectly induces
tyrosine phosphorylation of erb B-4 but not of the
epidermal growth factor-related receptors erb B-2 and
erb B-3 in different mouse and human mammary epithelial
cell lines. In addition, down-regulation of erb B-4 in
NMuMG mouse mammary epithelial cells and in T47D human breast cancer
cells, using an anti-erb B-4 blocking antibody or a
hammerhead ribozyme vector targeted to erb B-4 mRNA,
impairs the ability of CR-1 to fully activate mitogen-activated protein
kinase. Finally, chemical cross-linking of 125I-CR-1 to
mouse and human mammary epithelial cell membranes results in the
labeling of two specific bands with a molecular weight of 130 and 60 kDa, suggesting that the CR-1 receptor represents a novel receptor
structurally unrelated to any of the known type I receptor tyrosine
kinases. In conclusion, these data demonstrate that CR-1, upon binding
to an unknown receptor, can enhance the tyrosine kinase activity of
erb B-4 and that a functional erb B-4 receptor
is required for CR-1-induced MAPK activation.
Cripto-1 Indirectly Stimulates the Tyrosine Phosphorylation of
erb B-4 through a Novel Receptor
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Tumor Growth Factor Section, Laboratory of
Tumor Immunology and Biology, NCI, National Institutes of Health,
Bethesda, Maryland 20892, § MacMaster University, Hamilton,
Ontario, L8S 4K1 Canada, ¶ Department of Bioscience and
Biotechnology, Faculty of Engineering, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530 Japan, and
Lombardi Cancer
Center, Department of Biochemistry, Georgetown University Medical
Center, Washington, D. C. 20007-2197
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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