Aortic remodeling is modest and sex-independent in mice when hypertension is superimposed on aging.

Abstract:

OBJECTIVES:Increased central artery stiffness associates with cardiovascular disease. Among other factors, hypertension and aging are strong contributors to central artery stiffening, yet it has been difficult to separate their effects. Herein, we study isolated and combined effects of hypertension and aging on central artery remodeling in multiple mouse models as a function of sex. METHODS:We biomechanically phenotyped the aorta as a function of two different methods of inducing hypertension [infusion of angiotensin II (AngII) or combining a high salt diet with inhibition of endothelial-derived nitric oxide synthase using L-NAME] in male and female wild-type and fibulin-5 null mice, the latter of which models aspects of aortic aging. RESULTS:Despite increasing blood pressure similarly, salt + L-NAME led to adaptive and maladaptive remodeling in the abdominal and thoracic aorta, respectively, whereas AngII caused luminal dilatation but little remodeling of the wall. Importantly, effects of aging were more dramatic than those resulting from induced hypertension and, consequently, superimposing hypertension on aging led to modest additional changes in luminal radius and wall thickness, though wall stress and stiffness increased mainly because of the elevated pressure. CONCLUSION:Our results suggest that effects of hypertension on aortic remodeling are modest when superimposed on aging in mice, largely independent of sex. These findings are consistent with general observations in humans and in spontaneously hypertensive rats, though separated here for the first time in a rodent model characterized by a severe loss of elastic fiber integrity similar to that found in the aged human aorta.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Spronck B,Ferruzzi J,Bellini C,Caulk AW,Murtada SI,Humphrey JD

doi

10.1097/HJH.0000000000002400

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

1312-1321

issue

7

eissn

0263-6352

issn

1473-5598

journal_volume

38

pub_type

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