Effect of Branched Chain Amino Acids on Muscle
Branched Chain Amino Acids as Stimulant of Muscle Mitochondrial Function in Elderly People
研究概览
详细说明
Skeletal muscle mito ATP production in young people are stimulated by insulin when infused with a mixture of amino acids while clamping blood glucose at the basal level. Our preliminary results indicate that this effect on mito ATP production is directly related to amino acid levels. Recent publications indicated that infusion of insulin with amino acids specifically stimulate muscle mitochondrial protein synthesis with no effect on synthesis or contractile proteins or sarcoplasmic proteins. The recent publications also indicated that intracellular amino acid anabolic sensors are stimulated by amino acids. It appears that BCAA, especially leucine has a specific effect in stimulating intracellular signaling or translation of mRNA to protein synthesis. It has been shown that amino acids, especially leucine, stimulate protein synthesis by activation of the mTOR pathway in mTOR phosphorylates p70S6 kinase which in turn phosphorylates the ribosomal S6 protein, resulting in increased activity of the protein synthesis complex. Activated mTOR also phosphorylates eIF4E-BP1 and activates the protein synthesis initiation complex. It is the abundance of specific mRNAase that determines synthesis of which specific proteins are promoted. Our preliminary data supports that amino acids selectively promotes muscle mitochondrial protein synthesis by enhancing the abundance of transcripts of genes that encode mitochondrial proteins. Administration of an amino acid mixture, specifically BCAA, is proposed as a stimulant of muscle mitochondrial ATP production. Secondary measurements will be performed to understand the underlying mechanism of enhanced muscle ATP production. These results are likely to contribute to our understanding of the basic mechanisms of the regulation of mitochondrial biogenesis in humans which will have potential future application.
This is a cross-sectional study between young and old. The study will use the new proteomic techniques established in our laboratory to profile and quantify mitochondrial protein synthesis in the participants. The combination of metabolic labeling with stable isotope and measuring synthesis rates of specific mito proteins by tandem mass spectrometry will determine whether actual stimulation by BCAA occurs differentially in young and elderly.
研究类型
注册 (预期的)
阶段
- 不适用
联系人和位置
学习地点
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Minnesota
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Rochester、Minnesota、美国、55905
- Mayo Clinic
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
学习计划
研究是如何设计的?
设计细节
- 主要用途:治疗
- 分配:非随机化
- 介入模型:交叉作业
- 屏蔽:无(打开标签)
研究衡量的是什么?
主要结果指标
结果测量 |
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Does branched chain amino acids stimulate muscle mitochondrial ATP production in young and elderly?
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次要结果测量
结果测量 |
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Does branched chain amino acids increase abundance of mRNA of genes encoding mitochondrial proteins and transcription factors equally in young and old?
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Does branched chain amino acids increase levels of phosphorylated signaling proteins through the mTOR pathways equally in the young and old?
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Does branched chain amino acids increase fractional synthesis rates of specific mitochondrial proteins, mitochondrial protein concentrations and mitochondrial enzyme activities equally in the young and old?
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合作者和调查者
赞助
调查人员
- 首席研究员:K. Sreekumaran Nair, M.D.、Mayo Clinic
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
更多信息
与本研究相关的术语
其他研究编号
- 05-004000
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