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Exercise Training Restores Hypertension-Induced Changes in the Elastic Tissue of the Thoracic Aorta.
MedLine Citation:
PMID:  21829037     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Background/Aims: Pharmacological antihypertensive therapies decrease both wall hypertrophy and collagen, but are unable to diminish the elastic content in the thoracic aorta. We investigated the effects of exercise training on aortic structure and function. Methods: Spontaneously hypertensive rats (SHR) and normotensive rats (WKY), submitted to low-intensity training (T) or kept sedentary (S), were subjected to haemodynamic analyses. The thoracic aorta was processed for real-time PCR, light (morphometric/stereological evaluations) and electron microscopy. Results: SHR(S) versus WKY(S) exhibited a higher heart rate, pressure and pulse pressure, increased α-actin, elastin and collagen mRNA expression, augmented wall volume and cross-sectional area (marked elastin/collagen content). In the SHR, training reduced pressure and heart rate, with slight reduction in pulse pressure. SHR(T) aortas exhibited small morphometric changes, reduced α-actin, elastin and collagen mRNA expression, normalization of increased elastic content, reduction in collagen/connective tissue and a decrease in smooth muscle cell volume (p < 0.05 for all comparisons). SHR(T) aortas showed improved circumferential orientation of smooth muscle cells and prevention of rupture/duplication of internal elastic lamina. No effects were observed in trained WKY aortas. Conclusions: Training effectively corrects elastic, collagen and smooth muscle content in SHR aortas. These changes, by reducing aortic pulsatility, facilitate a buffering function and reduce the cardiovascular risk.
Authors:
Maria Tereza Jordão; Fernando V L Ladd; Antonio Augusto Coppi; Renato P Chopard; Lisete C Michelini
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-10
Journal Detail:
Title:  Journal of vascular research     Volume:  48     ISSN:  1423-0135     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206092     Medline TA:  J Vasc Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  513-524     Citation Subset:  -    
Copyright Information:
Copyright © 2011 S. Karger AG, Basel.
Affiliation:
Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
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