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American Journal of Pathology, Vol 150, 1443-1455, Copyright © 1997 by American Society for Investigative Pathology
REGULAR ARTICLES |
A Friedl, Z Chang, A Tierney and AC Rapraeger
Department of Pathology, University of Wisconsin-Madison 53792, USA.
Fibroblast growth factors (FGFs) play multiple roles during development and in adult tissues as paracrine regulators of growth and differentiation. FGFs signal through transmembrane receptor tyrosine kinases, but heparan sulfate is also required for signaling by members of the FGF family. In addition, heparan sulfate may be involved in determining tissue distribution of FGFs. Using biotinylated FGF-2 and FGF-7 (KGF) as probes, we have identified specific interactions between FGFs and heparan sulfates in human tissues. Both FGF species bind to tissue mast cells and to epithelial cell membranes. Binding to basement membrane heparan sulfate is tissue source dependent and specific. Although FGF-2 strongly binds to basement membrane heparan sulfate in skin and most other tissue sites examined, FGF-7 fails to bind to basement membrane heparan sulfate in most locations. However, in subendothelial matrix in blood vessels and in the basement membrane of a papillary renal cell carcinoma, strong FGF-7 binding is seen. In summary, distinct and specific affinities of heparan sulfates for different FGFs were identified that may affect growth factor activation and local distribution. Heparan sulfate may have a gatekeeper function to either restrict or permit diffusion of heparin-binding growth factors across the basement membrane.
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