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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Skeletal Muscle Lipid Content and Oxidative Activity in Relation to Muscle Fiber Type in Aging and Metabolic Syndrome
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Skeletal Muscle Lipid Content and Oxidative Activity in Relation to Muscle Fiber Type in Aging and Metabolic Syndrome

机译:骨骼肌脂质含量和氧化活性与衰老和代谢综合症中肌纤维类型的关系

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摘要

One of the most noticeable effects of aging is the reduction in skeletal muscle mass and strength (sarcopenia). The metabolic syndrome (MS) is also prevalent in old subjects, but its relevance to skeletal muscle characteristics has poorly been investigated. Immunohistochemical studies were performed with muscle biopsies from young (22 years) and old (73 years) men with and without MS to reveal age-dependent and MS-associated modifications of fiber-type characteristics. Atrophy of type II fibers and altered fiber shape characterized muscle aging in lean healthy men. In contrast, increased cross-sectional area of the most abundant type I and type IIA fibers, and reduced cytochrome c oxidase content in all fiber types, characterized MS. Aging and particularly MS were associated with accumulation of intramyocellular lipid droplets. Although lipids mostly accumulated in type I fibers, matrix-assisted laser desorption/ionization-mass spectrometry imaging of intramyocellular lipids did not distinguish fiber types, but clearly separated young, old, and MS subjects. In conclusion, our study suggests that MS in the elderly persons is associated with alterations in skeletal muscle at a fiber-type specific level. Overall, these fiber type-specific modifications may be important both for the age-related loss of muscle mass and strength and for the increased prevalence of MS in elderly subjects.
机译:衰老最明显的影响之一是骨骼肌质量和强度的减少(肌肉减少症)。代谢综合症(MS)在老年患者中也很普遍,但是对骨骼肌特征的相关性研究很少。免疫组织化学研究是对有或没有MS的年轻(22岁)和老年(73岁)男性进行的肌肉活检进行的,以揭示年龄依赖性和与MS相关的纤维类型特征的改变。 II型纤维的萎缩和纤维形状的改变是健康男性瘦弱肌肉的特征。相比之下,MS的特征是,最丰富的I型和IIA型纤维的横截面积增加,而所有纤维类型中细胞色素C氧化酶的含量降低。衰老,特别是MS与肌内脂质滴的积累有关。尽管脂质大部分聚集在I型纤维中,但肌细胞内脂质的基质辅助激光解吸/电离质谱成像无法区分纤维类型,但可以清楚地区分年轻,老年和MS受试者。总之,我们的研究表明,老年人的MS与纤维类型特定水平的骨骼肌改变有关。总体而言,这些特定于纤维类型的修饰对于与年龄相关的肌肉质量和强度的丧失以及老年受试者中MS患病率的增加可能都是重要的。

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