Document Detail


Heightened aberrant deposition of hard-wearing elastin in conduit arteries of prehypertensive SHR is associated with increased stiffness and inward remodeling.
MedLine Citation:
PMID:  18849339     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Elastin is a major component of conduit arteries and a key determinant of vascular viscoelastic properties. Aberrant organization of elastic lamellae has been reported in resistance vessels from spontaneously hypertensive rats (SHR) before the development of hypertension. Hence, we have characterized the content and organization of elastic lamellae in conduit vessels of neonatal SHR in detail, comparing the carotid arteries from 1-wk-old SHR with those from Wistar-Kyoto (WKY) and Sprague Dawley (SD) rats. The general structure and mechanics were studied by pressure myography, and the internal elastic lamina organization was determined by confocal microscopy. Cyanide bromide-insoluble elastin scaffolds were also prepared from 1-mo-old SHR and WKY aortas to assess their weight, amino acid composition, three-dimensional lamellar organization, and mechanical characteristics. Carotid arteries from 1-wk-old SHR exhibited narrower lumen and greater intrinsic stiffness than those from their WKY and SD counterparts. These aberrations were associated with heightened elastin content and with a striking reduction in the size of the fenestrae present in the elastic lamellae. The elastin scaffolds isolated from SHR aortas also exhibited increased relative weight and stiffness, as well as the presence of peculiar trabeculae inside the fenestra that reduced their size. We suggest that the excessive and aberrant elastin deposited in SHR vessels during perinatal development alters their mechanical properties. Such abnormalities are likely to compromise vessel expansion during a critical period of growth and, at later stages, they could compromise hemodynamic function and participate in the development of systemic hypertension.
Authors:
Silvia M Arribas; Ana M Briones; Catherine Bellingham; M Carmen González; Mercedes Salaices; Kela Liu; Yanting Wang; Aleksander Hinek
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-10
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  295     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-05     Completed Date:  2009-01-30     Revised Date:  2009-04-09    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H2299-307     Citation Subset:  IM    
Affiliation:
Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo 2, 28029 Madrid, Spain. silvia.arribas@uam.es
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Aging / pathology
Animals
Animals, Newborn
Blood Pressure
Carotid Arteries / pathology*,  physiopathology
Disease Models, Animal
Elastic Tissue / pathology*,  physiopathology
Elasticity
Hypertension / pathology*,  physiopathology
Male
Microscopy, Confocal
Myography
Rats
Rats, Inbred SHR
Rats, Inbred WKY
Rats, Sprague-Dawley
Comments/Corrections
Comment In:
Am J Physiol Heart Circ Physiol. 2009 Mar;296(3):H900; author reply H901   [PMID:  19255284 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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