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J. Cell Biol.,
Volume 140, Number 4, February 23, 1998 961-972

* Departments of Immunology and Vascular Biology, The Scripps Research 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.
The La Jolla
Cancer Research Center, The Burnham Institute, La Jolla, California 92037
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