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Exercise training restores hypertension-induced changes in the elastic tissue of the thoracic aorta.

Jordão, MT, Ladd, FV, Coppi, AA, Chopard, RP and Michelini, LC (2011) Exercise training restores hypertension-induced changes in the elastic tissue of the thoracic aorta. J Vasc Res, 48 (6). pp. 513-524.

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Abstract

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.

Item Type: Article
Authors :
NameEmailORCID
Jordão, MTUNSPECIFIEDUNSPECIFIED
Ladd, FVUNSPECIFIEDUNSPECIFIED
Coppi, AAa.coppi@surrey.ac.ukUNSPECIFIED
Chopard, RPUNSPECIFIEDUNSPECIFIED
Michelini, LCUNSPECIFIEDUNSPECIFIED
Date : 2011
Identification Number : 10.1159/000329590
Uncontrolled Keywords : Actins, Animals, Aorta, Thoracic, Blood Pressure, Collagen, Elasticity, Elastin, Hypertension, Male, Microscopy, Electron, Transmission, Myocytes, Smooth Muscle, Physical Conditioning, Animal, RNA, Messenger, Rats, Rats, Inbred SHR, Rats, Inbred WKY, Sedentary Lifestyle
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:11
Last Modified : 17 May 2017 14:47
URI: http://epubs.surrey.ac.uk/id/eprint/826750

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