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© The Rockefeller University Press, 0021-9525/1998//961 $5.00
The Journal of Cell Biology, Volume 140, Number 4, , 1998 961-972


Article

CAS/Crk Coupling Serves as a "Molecular Switch" for Induction of Cell Migration



Richard L. Klemke*, Jie Leng*, Rachel Molander*, Peter C. Brooks*, Kristiina Vuori{ddagger}, and David A. Cheresh*

* Departments of Immunology and Vascular Biology, The Scripps Research Institute, La Jolla, California 92037; {ddagger} The La Jolla Cancer Research Center, The Burnham Institute, La Jolla, California 92037

Abstract. Carcinoma cells selected for their ability to migrate in vitro showed enhanced invasive properties in vivo. Associated with this induction of migration was the anchorage-dependent phosphorylation of p130CAS (Crk-associated substrate), leading to its coupling to the adaptor protein c-CrkII (Crk). In fact, expression of CAS or its adaptor protein partner Crk was sufficient to promote cell migration, and this depended on CAS tyrosine phosphorylation facilitating an SH2-mediated complex with Crk. Cytokine-stimulated cell migration was blocked by CAS lacking the Crk binding site or Crk containing a mutant SH2 domain. This migration response was characterized by CAS/Crk localization to membrane ruffles and blocked by the dominant-negative GTPase, Rac, but not Ras. Thus, CAS/Crk assembly serves as a "molecular switch" for the induction of cell migration and appears to contribute to the invasive property of tumors.


1. Abbreviations used in this paper: aa, amino acid(s); CAS, Crk-associated substrate; ECM, extracellular matrix; FAK, focal adhesion kinase; FBM, fibroblast basal medium; IGF-1, insulin-like growth factor 1; SH, src homology.

The authors would like to thank Drs. A. Minden and M. Karin (University of California, San Diego, CA) for providing Rac and Ras constructs. We are also grateful to Dr. M. Matsuda (International Medical Center of Japan, Tokyo, Japan) for original Crk constructs, and Drs. H. Hirai (University of Tokyo, Tokyo, Japan) and B. Mayer (Howard Hughes Medical Institute, The Children's Hospital, Boston, MA) for CAS cDNA constructs and expression vectors.

D.A. Cheresh was supported by grants HL-54444, CA-50286, and CA-45726 from the National Institutes of Health (NIH). R.L. Klemke was supported by a fellowship award from the Joseph Drown Foundation. J. Leng was supported by the U.S. Army Medical Research and Material Command under DAMD17-96-1-6104. K. Vuori was supported by grant CA-71560 from the NIH. K. Vuori is a PEW scholar in Biomedical Sciences. This manuscript is number 11052-IMM from The Scripps Research Institute.

Address all correspondence to Richard L. Klemke, Departments of Immunology and Vascular Biology, IMM-24, The Scripps Research Institute, 10550 N. Torrey Pines Rd., La Jolla, CA 92037. Tel.: (619) 784-8164. Fax: 619-784-8926. E-mail: klemke{at}scripps.edu



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