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Mammary Biology and Tumorigenesis Laboratory, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892 [C. B., L. S., A. R., Y. S., N. K., M. H., D. S. S.]; Experimental Oncology B Unit, Istituto Fondazione Pascale, Naples 80131, Italy [N. N.]; Upper Austrian Research GmbH Zentrum, Linz 4020, Austria [C. W.]; Biogen, Inc., Cambridge, Massachusetts 02142 [H. A., K. W., M. S.]; and Department of Pharmacology, New York University Medical Center, New York, New York 10016 [R. U. M.]
Human Cripto-1 (CR-1) is a member of the epidermal growth factor-Cripto FRL1 Cryptic family that has been shown to function as a coreceptor with the type I Activin serine-threonine kinase receptor ALK4 for the transforming growth factor ß-related peptide Nodal. However, CR-1 can also activate the mitogen-activated protein kinase and Akt pathways independently of Nodal and ALK4 by an unknown mechanism. Here, we demonstrate that CR-1 specifically binds to Glypican-1, a membrane-associated heparan sulfate proteoglycan, and activates the tyrosine kinase c-Src, triggering the mitogen-activated protein kinase and Akt signaling pathways. Finally, an active Src kinase is necessary for CR-1 to induce in vitro transformation and migration in mouse mammary epithelial cells.
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