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© The Rockefeller University Press, 0021-9525/1999/12/1561/ $5.00
The Journal of Cell Biology, Volume 147, Number 7, December 27, 1999 1561-1568

Original Article

Bifurcation of Cell Migratory and Proliferative Signaling by the Adaptor Protein Shc

Lila R. Collinsa, William A. Rickettsb, Linda Yeha, and David Cheresha
a Department of Immunology and Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037
b Isis Pharmaceuticals, Carlsbad, California 92008

Correspondence to: David Cheresh, Departments of Immunology and Vascular Biology, IMM24, The Scripps Research Institute, 10550 N. Torrey Pines Rd., La Jolla, CA 92037. Tel:(858) 784-8281 Fax:(858) 784-8926 E-mail:cheresh{at}scripps.edu.

Cytokines and extracellular matrix proteins initiate signaling cascades that regulate cell migration and proliferation. Evidence is provided that the adaptor protein Shc can differentially regulate these processes. Specifically, under growth factor–limiting conditions, Shc stimulates haptotactic cell migration without affecting anchorage-dependent proliferation. However, when growth factors are present, Shc no longer influences cell migration; rather, Shc is crucial for DNA synthesis. Mutational analysis of Shc demonstrates that, while tyrosine phosphorylation is required for both DNA synthesis and cell migration, the switch in Shc signaling is associated with differential use of Shc's phosphotyrosine interacting domains; the PTB domain regulates haptotaxis, while the SH2 domain is selectively required for proliferation.

Key Words: Shc, cell migration, mitogenesis, SH2, PTB


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