Structural remodeling of coronary resistance arteries: effects of age and exercise training

被引:35
作者
Hanna, Mina A. [4 ,5 ,6 ]
Taylor, Curtis R. [5 ]
Chen, Bei [1 ]
La, Hae-Sun [4 ]
Maraj, Joshua J. [4 ]
Kilar, Cody R. [1 ]
Behnke, Bradley J. [2 ,3 ]
Delp, Michael D. [2 ,3 ]
Muller-Delp, Judy M. [1 ]
机构
[1] Univ Florida, Dept Physiol & Funct Genom, Gainesville, FL USA
[2] Univ Florida, Dept Appl Physiol & Kinesiol, Gainesville, FL USA
[3] Univ Florida, Ctr Exercise Sci, Gainesville, FL USA
[4] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA
[5] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA
[6] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
关键词
Verhoeff; van Geison; nanoindentation; elastic modulus; hypertrophy; PRESERVED EJECTION FRACTION; MYOCARDIAL COLLAGEN; HEART-FAILURE; CROSS-LINKING; BLOOD-FLOW; DIASTOLIC DYSFUNCTION; VASCULAR-RESISTANCE; NITRIC-OXIDE; STIFFNESS; VASOCONSTRICTOR;
D O I
10.1152/japplphysiol.01296.2013
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Age is known to induce remodeling and stiffening of large-conduit arteries; however, little is known of the effects of age on remodeling and mechanical properties of coronary resistance arteries. We employed a rat model of aging to investigate whether 1) age increases wall thickness and stiffness of coronary resistance arteries, and 2) exercise training reverses putative age-induced increases in wall thickness and stiffness of coronary resistance arteries. Young (4 mo) and old (21 mo) Fischer 344 rats remained sedentary or underwent 10 wk of treadmill exercise training. Coronary resistance arteries were isolated for determination of wall-to-lumen ratio, effective elastic modulus, and active and passive responses to changes in intraluminal pressure. Elastin and collagen content of the vascular wall were assessed histologically. Wall-to-lumen ratio increased with age, but this increase was reversed by exercise training. In contrast, age reduced stiffness, and exercise training increased stiffness in coronary resistance arteries from old rats. Myogenic responsiveness was reduced with age and restored by exercise training. Collagen-to-elastin ratio (C/E) of the wall did not change with age and was reduced with exercise training in arteries from old rats. Thus age induces hypertrophic remodeling of the vessel wall and reduces the stiffness and myogenic function of coronary resistance arteries. Exercise training reduces wall-to-lumen ratio, increases wall stiffness, and restores myogenic function in aged coronary resistance arteries. The restorative effect of exercise training on myogenic function of coronary resistance arteries may be due to both changes in vascular smooth muscle phenotype and expression of extracellular matrix proteins.
引用
收藏
页码:616 / 623
页数:8
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