Short-term muscle disuse lowers myofibrillar protein synthesis rates and induces anabolic resistance to protein ingestion.

Short-term muscle disuse lowers myofibrillar protein synthesis rates and induces anabolic resistance to protein ingestion.
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短期肌肉废用会降低肌原纤维蛋白质合成率并诱导对蛋白质摄入的合成代谢抵抗。

DOI:
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发表时间:
2016
期刊:
American Journal of Physiology. Endocrinology and Metabolism
影响因子:
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通讯作者:
L. V. van Loon
L. V. van Loon
中科院分区:
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文献类型:
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作者:
B. Wall;M. Dirks;T. Snijders;J. van Dijk;M. Fritsch;L. Verdijk;L. V. van Loon

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废用导致骨骼肌质量和功能的快速丧失。据推测,在整个生命周期中,短时间连续的肌肉废用在肌肉减少症的发展中起着重要作用。短期肌肉废用性萎缩的生理机制仍有待阐明。我们评估了5天肌肉废用对人体吸收后和餐后肌原纤维蛋白合成率的影响。12名健康年轻男性(22 ± 1岁)接受了为期5天的单腿膝关节制动(全腿石膏)。在制动前和制动后评估两条腿的股四头肌横截面积(CSA)。将l-[环-(2)H5]苯丙氨酸和l-[1-(13)C]亮氨酸的连续输注与25 g的本征l-[1-(13)C]苯丙氨酸和l-[1-(13)C]亮氨酸标记的膳食蛋白的推注结合,以评估固定和非固定对照腿中的肌原纤维肌蛋白部分合成速率。固定导致固定腿的四头肌CSA降低3.9 ± 0.6%。基于l-[环-(2)H5]苯丙氨酸示踪剂,固定使吸收后肌原纤维蛋白合成速率降低41 ± 13%。(0.015 ± 0.002vs0.032 ± 0.005%/h,P < 0.01),餐后肌原纤维蛋白合成率降低53 ± 4%(0.020 ± 0.002vs0.044 ± 0.003%/h,P < 0.01)。使用1-[1-(13)C]亮氨酸示踪剂发现了可比较的结果。在蛋白质摄入后,与对照腿相比,固定腿中肌原纤维蛋白结合的l-[1-(13)C]苯丙氨酸富集降低了53 ± 18%(分别为0.007 ± 0.002和0.015 ± 0.002摩尔%过量,P < 0.05)。我们的结论是,5天的肌肉废用大大降低了吸收后肌原纤维蛋白的合成速率,并诱导蛋白质摄入的合成代谢阻力。
Disuse leads to rapid loss of skeletal muscle mass and function. It has been hypothesized that short successive periods of muscle disuse throughout the lifespan play an important role in the development of sarcopenia. The physiological mechanisms underlying short-term muscle disuse atrophy remain to be elucidated. We assessed the impact of 5 days of muscle disuse on postabsorptive and postprandial myofibrillar protein synthesis rates in humans. Twelve healthy young (22 ± 1 yr) men underwent a 5-day period of one-legged knee immobilization (full leg cast). Quadriceps cross-sectional area (CSA) of both legs was assessed before and after immobilization. Continuous infusions of l-[ring-(2)H5]phenylalanine and l-[1-(13)C]leucine were combined with the ingestion of a 25-g bolus of intrinsically l-[1-(13)C]phenylalanine- and l-[1-(13)C]leucine-labeled dietary protein to assess myofibrillar muscle protein fractional synthetic rates in the immobilized and nonimmobilized control leg. Immobilization led to a 3.9 ± 0.6% decrease in quadriceps muscle CSA of the immobilized leg. Based on the l-[ring-(2)H5]phenylalanine tracer, immobilization reduced postabsorptive myofibrillar protein synthesis rates by 41 ± 13% (0.015 ± 0.002 vs. 0.032 ± 0.005%/h, P < 0.01) and postprandial myofibrillar protein synthesis rates by 53 ± 4% (0.020 ± 0.002 vs. 0.044 ± 0.003%/h, P < 0.01). Comparable results were found using the l-[1-(13)C]leucine tracer. Following protein ingestion, myofibrillar protein bound l-[1-(13)C]phenylalanine enrichments were 53 ± 18% lower in the immobilized compared with the control leg (0.007 ± 0.002 and 0.015 ± 0.002 mole% excess, respectively, P < 0.05). We conclude that 5 days of muscle disuse substantially lowers postabsorptive myofibrillar protein synthesis rates and induces anabolic resistance to protein ingestion.
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