(Circulation. 1995;92:904-911.)
© 1995 American Heart Association, Inc.
Articles |
Accumulation of Fetal Fibronectin mRNAs After Balloon Denudation of Rabbit Arteries
From the Departments of Cardiology (C.B., M.H.), University of Lille, France, and Inserm U127 (F.M., P.O., F.F., V.R., J.L.S., L.R.), IFR Circulation Lariboisière, Université D. Diderot, Paris, France.
Correspondence to Lydie Rappaport, Inserm U127, 41 Blvd de la Chapelle, 75010 Paris, France.
Background Fibronectin (FN), a component of the extracellular matrix, influences cellular migration and differentiation. It is a prominent component of the extracellular matrix of normal arteries and is thought to play an important role in the pathogenesis of restenosis after angioplasty. FN exists in multiple forms that arise from a single RNA transcript that can be alternatively spliced. EIIIA- and EIIIB-containing FN mRNAs predominate in the embryo, whereas in the adult, most of the normal tissue FN lacks these domains. Since few data were available concerning pattern of expression of the different alternatively spliced forms of FN mRNA in arteries after endoluminal injury, we analyzed the expression of EIIIA and EIIIB FN isoforms at different times after experimental angioplasty.
Methods and Results The spatial and temporal alterations in FN expression were studied in an in vivo model of endothelial denudation in the rabbit aorta and iliac artery by a combination of immunochemistry and in situ hybridization methods. Alternatively spliced forms of FN EIIIA and EIIIB were detected in the media and the adventitia of both types of vessels 24 to 48 hours after injury. Two weeks after injury, EIIIA and EIIIB mRNAs were found to accumulate within the luminal layers of the neointima. The cellular form of FN protein was not found until 2 weeks after the injury and accumulated in the inner part of the neointima.
Conclusions These data demonstrate that FN upregulation is an early and long-lasting process after arterial injury. These results suggest that the induction of the embryonic FN isoforms may be involved in the restenotic process that follows balloon denudation of arteries.
Key Words: restenosis • muscle • smooth • cells • endothelium
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