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*CYCLOHEXIMIDE
*CYTOCHALASIN D
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© The Rockefeller University Press, 0021-9525/1998//241 $5.00
The Journal of Cell Biology, Volume 141, Number 1, , 1998 241-253

Regular Articles

Activation of Distinct {alpha}5β1-mediated Signaling Pathways by Fibronectin's Cell Adhesion and Matrix Assembly Domains



Denise C. Hocking, Jane Sottile, and Paula J. McKeown-Longo

Department of Physiology and Cell Biology, Albany Medical College, Albany, New York 12208

The interaction of cells with fibronectin generates a series of complex signaling events that serve to regulate several aspects of cell behavior, including growth, differentiation, adhesion, and motility. The formation of a fibronectin matrix is a dynamic, cell-mediated process that involves both ligation of the {alpha}5β1 integrin with the Arg-Gly-Asp (RGD) sequence in fibronectin and binding of the amino terminus of fibronectin to cell surface receptors, termed "matrix assembly sites," which mediate the assembly of soluble fibronectin into insoluble fibrils. Our data demonstrate that the amino-terminal type I repeats of fibronectin bind to the {alpha}5β1 integrin and support cell adhesion. Furthermore, the amino terminus of fibronectin modulates actin assembly, focal contact formation, tyrosine kinase activity, and cell migration. Amino-terminal fibronectin fragments and RGD peptides were able to cross-compete for binding to the {alpha}5β1 integrin, suggesting that these two domains of fibronectin cannot bind to the {alpha}5β1 integrin simultaneously. Cell adhesion to the amino-terminal domain of fibronectin was enhanced by cytochalasin D, suggesting that the ligand specificity of the {alpha}5β1 integrin is regulated by the cytoskeleton. These data suggest a new paradigm for integrin-mediated signaling, where distinct regions within one ligand can modulate outside-in signaling through the same integrin.

Abbreviations used in this paper: FAK, focal adhesion kinase; OGPS, octyl-β-D-thioglucopranoside.

Address all correspondence to Paula J. McKeown-Longo, Department of Physiology and Cell Biology, Neil Hellman Medical Research Building, Albany Medical College, 47 New Scotland Avenue, Albany, NY 12208. Tel.: (518) 262-5666. Fax: (518) 262-5669. E-mail: paula_mckeown-longo{at}ccgateway.amc.edu


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