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营养不良老年大鼠骨骼肌蛋白质组学特征分析。

Characterization of the Skeletal Muscle Proteome in Undernourished Old Rats.

机构信息

Human Nutrition Unit, INRAE, Auvergne Human Nutrition Research Center, Clermont Auvergne University, 63000 Clermont-Ferrand, France.

Animal Products Quality Unit (QuaPA), INRAE, 63122 Clermont-Ferrand, France.

出版信息

Int J Mol Sci. 2022 Apr 26;23(9):4762. doi: 10.3390/ijms23094762.

DOI:10.3390/ijms23094762
PMID:35563153
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9101871/
Abstract

Aging is associated with a progressive loss of skeletal muscle mass and function termed sarcopenia. Various metabolic alterations that occur with aging also increase the risk of undernutrition, which can worsen age-related sarcopenia. However, the impact of undernutrition on aged skeletal muscle remains largely under-researched. To build a deeper understanding of the cellular and molecular mechanisms underlying age-related sarcopenia, we characterized the undernutrition-induced changes in the skeletal muscle proteome in old rats. For this study, 20-month-old male rats were fed 50% or 100% of their spontaneous intake for 12 weeks, and proteomic analysis was performed on both slow- and fast-twitch muscles. Proteomic profiling of undernourished aged skeletal muscle revealed that undernutrition has profound effects on muscle proteome independently of its effect on muscle mass. Undernutrition-induced changes in muscle proteome appear to be muscle-type-specific: slow-twitch muscle showed a broad pattern of differential expression in proteins important for energy metabolism, whereas fast-twitch muscle mainly showed changes in protein turnover between undernourished and control rats. This first proteomic analysis of undernourished aged skeletal muscle provides new molecular-level insight to explain phenotypic changes in undernourished aged muscle. We anticipate this work as a starting point to define new biomarkers associated with undernutrition-induced muscle loss in the elderly.

摘要

衰老是与骨骼肌质量和功能逐渐丧失相关的,这种现象被称为肌肉减少症。随着年龄的增长,各种代谢变化也会增加营养不良的风险,而营养不良会使与年龄相关的肌肉减少症恶化。然而,营养不良对老年骨骼肌的影响在很大程度上仍未得到充分研究。为了更深入地了解与年龄相关的肌肉减少症的细胞和分子机制,我们对老年大鼠骨骼肌中的营养不良诱导的蛋白质组变化进行了特征描述。在这项研究中,20 月龄的雄性大鼠接受 50%或 100%的自发摄入量喂养 12 周,对慢肌和快肌进行蛋白质组分析。对营养不良的老年骨骼肌进行蛋白质组学分析表明,营养不良对肌肉蛋白质组的影响独立于其对肌肉质量的影响。肌肉蛋白质组的营养不良诱导变化似乎具有肌肉类型特异性:慢肌中与能量代谢有关的蛋白质的差异表达广泛,而快肌中主要表现为营养不良和对照大鼠之间的蛋白质周转变化。这项对营养不良的老年骨骼肌的首次蛋白质组学分析为解释营养不良的老年肌肉的表型变化提供了新的分子水平的见解。我们期望这项工作可以作为一个起点,定义与老年人中由营养不良引起的肌肉丧失相关的新生物标志物。

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