You could be reading the full-text of this article now if you...

If you have access to this article through your institution,
you can view this article in

Increased stiffness and cellmatrix interactions of abdominal aorta in two experimental nonhypertensive models: long-term chemically sympathectomized and sinoaortic denervated rats

Bouissou, Camillea; Lacolley, Patrickb; Dabire, Huberta; Safar, Michel E.c; Gabella, Giorgiod; Duchatelle, Véroniquee; Challande, Pascalf,g,*; Bezie, Yvonnickh,*

Journal of Hypertension:
doi: 10.1097/HJH.0000000000000073
ORIGINAL PAPERS: Blood vessels
Abstract

Rationale: Sinoaortic denervated (SAD) and chemically sympathectomized (SNX) rats are characterized by a decrease in arterial distensibility without hypertension and would, thus, be relevant for analyzing arterial wall stiffening independently of blood pressure level. The fibronectin network, which plays a pivotal role in cell–matrix interactions, is a major determinant of arterial stiffness. We hypothesized that in SAD and SNX rats, arterial stiffness is increased, due to alterations of cell–matrix anchoring leading to spatial reorganization of the extracellular matrix.

Methods: The intrinsic elastic properties of the arterial wall were evaluated in vivo by the relationship between incremental elastic modulus determined by echotracking and circumferential wall stress. The changes of cell-extracellular matrix links in the abdominal aorta were evaluated by studying fibronectin, vascular integrin receptors, and ultrastructural features of the aorta by immunochemistry.

Results: In both experimental conditions, wall stiffness increased, associated with different modifications of cell-extracellular matrix adhesion. In SAD rats, increased media cross-sectional area was coupled with an increase of muscle cell attachments to its extracellular matrix via fibronectin and its α5-β1 integrin. In SNX rats, reduced media cross-sectional area was associated with upregulation of αv-β3 integrin and more extensive connections between dense bands and elastic fibers despite the disruption of the elastic lamellae.

Conclusion: In aorta of SNX and SAD rats, a similar arterial stiffness is associated to different structural alterations. An increase in αvβ3 or α5β1 integrins together with the already reported increase in the proportion of less distensible (collagen) to more distensible (elastin) components in both models contributes to remodeling and stiffening of the abdominal aorta.

Author Information

aINSERM, U955, Créteil

bINSERM, U1116, Nancy

cDiagnosis Center and Université René Descartes, Hôtel-Dieu Hospital, UFR Médecine, Paris, France

dDepartment of Anatomy and Developmental Biology, University College London, London, UK

eDepartment of Pathology, Groupe Hospitalier Paris Saint-Joseph

fUPMC Univ Paris 06

gCNRS UMR 7190

hDepartment of Pharmacy, Groupe Hospitalier Paris Saint-Joseph, Paris, France

*P.C. and Y.B. contributed equally to the writing of the article.

Correspondence to Dr Yvonnick Bezie, Groupe Hospitalier Paris Saint-Joseph, 185 Rue Raymond Losserand, F-75674 Paris Cedex 14, France. Tel: +33 1 44 12 36 16; fax: +33 1 44 12 34 61; e-mail: ybezie@hpsj.fr

Abbreviations: σ, circumferential wall stress; ECM, extracellular matrix; Einc, incremental elastic modulus; MAP, mean arterial pressure; SAD, sinoaortic denervated rats; SMC, smooth muscle cell; SNX, chemically sympathectomized rats by guanethidine

Received 25 July, 2013

Revised 8 November, 2013

Accepted 8 November, 2013

© 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins