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(Hypertension. 2001;38:1167.)
© 2001 American Heart Association, Inc.

Fourth Workshop on Structure and Function of Large Arteries: Part II

Mechanical Strength of the Isolated Carotid Artery in SHR

Geraldine Cohuet; Pascal Challande; Mary Osborne-Pellegrin; Silvia M. Arribas; Anna Dominiczak; Huguette Louis; Stéphane Laurent; Patrick Lacolley

From the "Institut National de la Santé et de la Recherche Médicale," Inserm EMI 0107 (G.C., H.L., S.L., P.L.), U460 (M.O.P.), Paris, LMP, Université Paris VI (P.C.), France; Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid (S.A.), Spain; and the Department of Medicine and Therapeutics, University of Glasgow (A.D.), Scotland, United Kingdom.

Correspondence to Patrick Lacolley, MD, PhD, Inserm EMI 0107, 15 rue de l’Ecole de Médecine, 75270 Paris Cedex 06, France. E-mail lacolley{at}ccr.jussieu.f

Abstract

Abstract—— We have previously reported an adaptation of arterial wall elasticity in spontaneously hypertensive rats (SHR) that involves an increase in both fibronectin/5ß1-integrin complexes and smooth-muscle elastic lamellae connections. We examined the mechanical strength (MS) of the carotid artery in relation to its elastic properties, its elastin/collagen content, and the structure of the internal elastic lamina. MS was defined as the in vitro intraluminal pressure and wall stress that produces rupture of the vascular wall. Intact carotid arteries from 3-month-old normotensive rats (Wistar-Kyoto, WKY) and SHR were cannulated on a specially designed device and adjusted to their in situ length. A slowly increasing static pressure was applied until wall rupture occurred to determine the static mechanical behavior and MS. Static elasticity was similar in SHR and WKY, as were the rupture pressure (2740±90 versus 2740±40 mm Hg) and wall stress at rupture (11.5±1.0 versus 12.8±0.4 MPa), indicating equivalent MS in both groups. Histological examination showed several wall ruptures and dissociation of lamellar units that did not differ significantly between the 2 groups. Confocal microscopy showed that the size of fenestrations of the internal elastic lamina and the fraction of area occupied by them were reduced 3-fold in SHR. We have demonstrated that static elasticity of the arterial wall and mechanical strength are similar in carotid arteries from SHR and WKY.

Key Words: arteries • collagen • hypertension, experimental • remodeling

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