期刊
EXPERIMENTAL GERONTOLOGY
卷 76, 期 -, 页码 80-88出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.exger.2016.01.013
关键词
Hypertension; Capillary; Aging; Metabolic syndrome; Muscle fiber; Sarcopenia
资金
- Fondation Caisse d'Epargne Rhone-Alpes [30]
- European Union Collaborative Project MyoAge EC-Fp7 [CT-223576]
- Region Auvergne
- Fonds Europeens de Developpement Regional (FEDER) [23000422]
Aging strongly affects the skeletal muscle and is associated with microvascular dysfunctions. Age is also a primary risk factor for the metabolic syndrome, which is a cluster of metabolic and cardiovascular symptoms. Among the metabolic syndrome components, hypertension is the most prevalent in elderly subjects and has a central role in vascular alterations. Despite critical clinical outcomes, the effects of hypertension and metabolic syndrome on skeletal muscle capillarization have poorly been investigated during aging. In the present study, muscle biopsies from normotensive young (YO) and elderly (ELc) men, and elderly men with hypertension (EL-HT) or metabolic syndrome (EL-MS) were assessed for the number of capillaries around a fiber (CAF), capillary-to-fiber perimeter exchange (CFPE), length of contact to perimeter of fiber ratio (LC/PF), capillary tortuosity, and for extracellular matrix (ECM) embedding capillaries. As capillarization and muscle mitochondrial oxidative capacity may be associated, we also investigated cytochrome c oxidase (COX) content. Our findings indicate that capillarization and COX did not change between normotensive adult and old individuals. They further reveal that hypertension in elderly men is associated with reduced CAF (ELc: 5.2 +/- 0.4, EL-HT: 4.1 +/- 0.2, P < 0.02 for type I fibers; ELc: 4.1 +/- 0.2, EL-HT: 3.1 +/- 0.3, P < 0.03 for type IIA fibers), CFPE (ELc: 7.9 +/- 0.7, EL-HT: 6.4 +/- 0.4 capillaries/1000 mu m, P < 0.03 for type I fibers; ELc: 6.5 +/- 0.4, EL-HT: 5.2 +/- 0.4 capillaries/1000 mu m, P < 0.03 for type IIA fibers), LC/PF (ELc: 23.3 +/- 1.2, EL-HT: 17.8 +/- 0.6%, P < 0.01 for type I fibers; ELc: 19.8 +/- 1.1, EL-HT: 15.6 +/- 0.8%, P < 0.01 for type IIA fibers) and capillary tortuosity, and with ECM endomysium fibrosis. Capillary rarefaction also correlated with lower COX content in the old hypertensive muscle. No further modification occurred with metabolic syndrome in elderly men. Collectively, our results suggest that hypertension plays a central role in muscle capillarization during aging, and that the other components of metabolic syndrome do not make major additional changes in the aged skeletal muscle capillary network. (C) 2016 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据