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© The Rockefeller University Press, 0021-9525/1998//1659 $5.00
The Journal of Cell Biology, Volume 141, Number 7, , 1998 1659-1673


Articles

Fibroblast Growth Factor-2 (FGF-2) Induces Vascular Endothelial Growth Factor (VEGF) Expression in the Endothelial Cells of Forming Capillaries: An Autocrine Mechanism Contributing to Angiogenesis



Graziano Seghezzi*,§, Sundeep Patel*, Christine J. Ren§, Anna Gualandris||, Giuseppe Pintucci||, Edith S. Robbins||, Richard L. Shapiro§, Aubrey C. Galloway*, Daniel B. Rifkin||, and Paolo Mignatti*,§,||

Department of Surgery, * Cardiovascular Surgery Research Laboratory and § S.A. Localio General Surgery Research Laboratory; and || Department of Cell Biology, and the Raymond and Beverly Sackler Foundation Laboratory, and the Kaplan Cancer Center, New York University Medical Center, New York 10016

FGF-2 and VEGF are potent angiogenesis inducers in vivo and in vitro. Here we show that FGF-2 induces VEGF expression in vascular endothelial cells through autocrine and paracrine mechanisms. Addition of recombinant FGF-2 to cultured endothelial cells or upregulation of endogenous FGF-2 results in increased VEGF expression. Neutralizing monoclonal antibody to VEGF inhibits FGF-2–induced endothelial cell proliferation. Endogenous 18-kD FGF-2 production upregulates VEGF expression through extracellular interaction with cell membrane receptors; high-Mr FGF-2 (22–24-kD) acts via intracellular mechanism(s). During angiogenesis induced by FGF-2 in the mouse cornea, the endothelial cells of forming capillaries express VEGF mRNA and protein. Systemic administration of neutralizing VEGF antibody dramatically reduces FGF-2-induced angiogenesis. Because occasional fibroblasts or other cell types present in the corneal stroma show no significant expression of VEGF mRNA, these findings demonstrate that endothelial cell-derived VEGF is an important autocrine mediator of FGF-2-induced angiogenesis. Thus, angiogenesis in vivo can be modulated by a novel mechanism that involves the autocrine action of vascular endothelial cell-derived FGF-2 and VEGF.


Abbreviations used in this paper: BAE, bovine aortic endothelial cells; BCE, bovine capillary endothelial cells; DIG, digoxygenin; FGF-2, fibroblast growth factor-2; HAE, human aortic endothelial cells; HMW FGF-2, high molecular weight fibroblast growth factor-2; HUVE, human umbilical vein endothelial cells; LMW FGF-2, low molecular weight fibroblast growth factor-2; rFGF-2, recombinant fibroblast growth factor-2; VEGF, vascular endothelial growth factor; vWF, von Willebrand factor.

Address all correspondence to Paolo Mignatti, Department of Cell Biology, New York University Medical Center, 550 First Avenue, New York, NY 10016. Tel.: (212) 263-1478. Fax: (212) 263-0147. E-mail: mignap01 @http://mcrcr.med.nyu.edu



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