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Investigative Ophthalmology & Visual Science, Vol 31, 323-333, Copyright © 1990 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Binding of basic fibroblast growth factor to normal and neovascularized rabbit cornea

G Soubrane, J Jerdan, I Karpouzas, NA Fayein, B Glaser, G Coscas, Y Courtois and JC Jeanny
Unite de Recherches Gerontologiques, Inserm U. 118, Paris, France.

The labeling pattern of frozen sections of rabbit cornea incubated with radioiodinated basic fibroblast growth factor (bFGF) was investigated in normal corneas and prostaglandin-induced neovascularized corneas by autoradiography followed by image analysis. 125I-bFGF binds to Bowman's, Descemet's, and vascular basement membranes in a dose- dependent manner. The specificity of the binding of bFGF to basement membrane was demonstrated by the following experiments: 1) an excess of unlabeled growth factor displaced the labeling; 2) histones did not modify the labeling; and 3) 2 M NaCl washing and enzymatic treatment with heparitinase prevented binding of labeled growth factor without apparent destruction of the overall structure of the basement membrane. Our results suggest that bFGF binds to the heparan sulfate proteoglycan of basement membranes. Both normal limbal vessels and the newly formed corneal vessels exhibited the same type of labeling but with different intensities, according to the degree of maturation of the new vessels. bFGF binding also is located clearly on the endothelial cells in both types of vessels. This second binding site could correspond to the high affinity receptors on the cell surface and suggests a direct interaction of bFGF with endothelial cells during new vessel formation.


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