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(Circulation. 1996;93:18-22.)
© 1996 American Heart Association, Inc.

Articles

Basic Fibroblast Growth Factor Restores Endothelium-Dependent Responses After Balloon Injury of Rabbit Arteries

Thibaud Meurice, MD; Christophe Bauters, MD; Jean-Luc Auffray, MD; Benoît Vallet, MD, PhD; Martial Hamon, MD; Franck Valero, MD; Eric Van Belle, MD; Jean-Marc Lablanche, MD; Michel E. Bertrand, MD

From the Departments of Pharmacology (T.M., F.V.), Cardiology (C.B., J.-L.A., M.H., E.v.B., J.-M.L., M.E.B.), and Anesthesiology (B.V.), University of Lille (France).

Correspondence to Christophe Bauters, MD, Service de Cardiologie B et Hémodynamique, Blvd du Prof J. Leclercq, 59037 Lille Cedex, France.

Background After experimental angioplasty, partial or complete reendothelialization of the denuded surface occurs; the function of the regenerated endothelium has, however, been shown to be abnormal. Basic fibroblast growth factor (bFGF) is mitogenic for endothelial cells in vitro and in vivo. We investigated whether chronic administration of bFGF in a rabbit model of balloon denudation might not only improve endothelial regrowth but also restore normal physiological responses to endothelium-dependent agonists.

Methods and Results Thirty-nine New Zealand White rabbits underwent balloon denudation of the right iliac artery. Twenty rabbits received intravenous administration of bFGF (2.5 µg twice a week for 2 weeks). Nineteen rabbits receiving saline injections served as controls. Animals were killed on day 28 for assessment of reendothelialization and neointimal thickening and for analysis of in vitro vasoreactivity. Animals in the bFGF group had a significantly (P<.005) greater degree of reendothelialization than controls (115±13 versus 55±6 mm²). Neointimal thickening was similar in the two groups. Four weeks after denudation, endothelium-independent responses did not differ significantly between the two groups. In contrast, the maximal endothelium-dependent acetylcholine-induced relaxation of the bFGF-treated animals (E_max, 40±7%) was significantly greater than that of the control group (E_max, 11±9%; P<.05).

Conclusions Systemic administration of bFGF restores, in large part, the responses of previously denuded arterial segments to endothelium-dependent vasodilators. Angiogenic growth factors may help to reestablish normal endothelial cell function in patients who have undergone angioplasty.

Key Words: endothelium • angioplasty • growth substances • vasodilation

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