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Kaspy MS, Hannaian SJ, Bell ZW, Churchward-Venne TA. The effects of branched-chain amino acids on muscle protein synthesis, muscle protein breakdown and associated molecular signalling responses in humans: an update. Nutr Res Rev 2023:1-14. [PMID: 37681443 DOI: 10.1017/s0954422423000197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
Branched-chain amino acids (BCAA: leucine, isoleucine and valine) are three of the nine indispensable amino acids, and are frequently consumed as a dietary supplement by athletes and recreationally active individuals alike. The popularity of BCAA supplements is largely predicated on the notion that they can stimulate rates of muscle protein synthesis (MPS) and suppress rates of muscle protein breakdown (MPB), the combination of which promotes a net anabolic response in skeletal muscle. To date, several studies have shown that BCAA (particularly leucine) increase the phosphorylation status of key proteins within the mechanistic target of rapamycin (mTOR) signalling pathway involved in the regulation of translation initiation in human muscle. Early research in humans demonstrated that BCAA provision reduced indices of whole-body protein breakdown and MPB; however, there was no stimulatory effect of BCAA on MPS. In contrast, recent work has demonstrated that BCAA intake can stimulate postprandial MPS rates at rest and can further increase MPS rates during recovery after a bout of resistance exercise. The purpose of this evidence-based narrative review is to critically appraise the available research pertaining to studies examining the effects of BCAA on MPS, MPB and associated molecular signalling responses in humans. Overall, BCAA can activate molecular pathways that regulate translation initiation, reduce indices of whole-body and MPB, and transiently stimulate MPS rates. However, the stimulatory effect of BCAA on MPS rates is less than the response observed following ingestion of a complete protein source providing the full complement of indispensable amino acids.
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Affiliation(s)
- Matthew S Kaspy
- Department of Kinesiology and Physical Education, McGill University, 475 Avenue Des Pins H2W 1S4, Montreal, QC, Canada
| | - Sarkis J Hannaian
- Department of Kinesiology and Physical Education, McGill University, 475 Avenue Des Pins H2W 1S4, Montreal, QC, Canada
- Research Institute of the McGill University Health Centre, Glen Site, 1001 Boul. Décarie, H4A 3J1 Montreal, QC, Canada
| | - Zachary W Bell
- Department of Kinesiology and Physical Education, McGill University, 475 Avenue Des Pins H2W 1S4, Montreal, QC, Canada
| | - Tyler A Churchward-Venne
- Department of Kinesiology and Physical Education, McGill University, 475 Avenue Des Pins H2W 1S4, Montreal, QC, Canada
- Division of Geriatric Medicine, McGill University, Montreal General Hospital, Room D6 237.F, 1650 Cedar Avenue, H3G 1A4, Montreal, QC, Canada
- Research Institute of the McGill University Health Centre, Glen Site, 1001 Boul. Décarie, H4A 3J1 Montreal, QC, Canada
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Akashi T, Noguchi S, Takahashi Y, Nishimura T, Tomi M. L-type Amino Acid Transporter 1 (SLC7A5)-Mediated Transport of Pregabalin at the Rat Blood-Spinal Cord Barrier and its Sensitivity to Plasma Branched-Chain Amino Acids. J Pharm Sci 2023; 112:1137-1144. [PMID: 36627052 DOI: 10.1016/j.xphs.2022.12.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/27/2022] [Accepted: 12/29/2022] [Indexed: 01/09/2023]
Abstract
Pregabalin is an anti-neuropathic pain drug inhibiting the α2δ subunit of the voltage-dependent calcium channel in the spinal cord. The aim of this study is to characterize the transport mechanism of pregabalin at the blood-spinal cord barrier (BSCB) by means of in vivo experiments in rats and in vitro studies using primary-cultured rat spinal cord endothelial cells. We isolated endothelial cells by culturing rat spinal cord tissue in the presence of puromycin, and confirmed the expression of BSCB markers such as Cd31, Mdr1a, and Claudin-5. The uptake of pregabalin by primary-cultured rat spinal cord endothelial cells was sodium-independent and was significantly inhibited by L-leucine, 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid, and JPH203. These results suggest the involvement of L-type amino acid transporter (LAT) 1. LAT1 mRNA and protein was expressed in primary-cultured rat spinal cord endothelial cells, which is consistent with LAT1 expression at the BSCB. In the in vivo study, the transfer of pregabalin to rat spinal cord and brain was significantly decreased by the pre-administration of branched chain amino acids (BCAAs), which are endogenous substrates of LAT1. Our results indicate that pregabalin transport across the BSCB is mediated at least in part by LAT1 and is inhibited by plasma BCAAs.
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Affiliation(s)
- Tomoya Akashi
- Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan
| | - Saki Noguchi
- Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan
| | - Yu Takahashi
- Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan
| | - Tomohiro Nishimura
- Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan
| | - Masatoshi Tomi
- Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan.
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Prokopidis K, Kirwan RP, Giannos P, Triantafyllidis KK, Kechagias KS, Forbes SC, Candow DG. The impact of branched-chain amino acid supplementation on measures of glucose homeostasis in individuals with hepatic disorders: A systematic review of clinical studies. J Hum Nutr Diet 2022; 36:603-611. [PMID: 35996869 DOI: 10.1111/jhn.13076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 07/25/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Branched chain amino acid (BCAA) supplementation may influence glucose metabolism in individuals with impaired glycemic profile. This systematic review investigated the effects of isolated BCAA supplementation on measures of glucose homeostasis in individuals with hepatic disorders. METHODS We searched PubMed, Web of Science, Cochrane Library, and Scopus for published clinical trials that investigated the effects of isolated BCAA supplementation on measures of glucose homeostasis, including serum glucose and insulin, glycated hemoglobin (HbA1c) levels, and Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) scores. RESULTS Eleven trials met the inclusion criteria. Only one study revealed a decrease in serum glucose from BCAA supplementation compared to three studies that showed increases. Five studies demonstrated no significant changes in serum glucose, and two studies displayed no changes in HbA1c following BCAA supplementation. Serum levels of insulin were decreased in three studies, remained unchanged in one, whilst increased in the remaining three studies. BCAA supplementation reduced HOMA-IR scores in two studies, increased HOMA-IR scores in another two or resulted in no changes in two other studies. CONCLUSIONS BCAA supplementation in isolation had no effect on overall glucose homeostasis in individuals with hepatic disorders, although some improvements on serum insulin levels and HOMA-IR scores were observed. Overall, there is little evidence to support the utilization of BCAA supplementation as a potential nutritional strategy for improving measures of glucose homeostasis in individuals with hepatic disorders. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Konstantinos Prokopidis
- Department of Musculoskeletal Biology, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK
| | - Richard P Kirwan
- School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK
| | - Panagiotis Giannos
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
| | | | - Konstantinos S Kechagias
- Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, UK.,Department of Nutrition & Dietetics, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK
| | - Scott C Forbes
- Department of Physical Education Studies, Faculty of Education, Brandon University, Brandon, MB, Canada
| | - Darren G Candow
- Faculty of Kinesiology and Health Studies, University of Regina, Regina, SK, Canada
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Metabolism of Imidazole Dipeptides, Taurine, Branched-Chain Amino Acids, and Polyamines of the Breast Muscle Are Affected by Post-Hatch Development in Chickens. Metabolites 2022; 12:metabo12010086. [PMID: 35050208 PMCID: PMC8778354 DOI: 10.3390/metabo12010086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/08/2022] [Accepted: 01/12/2022] [Indexed: 02/01/2023] Open
Abstract
To explore metabolic characteristics during the post-hatch developmental period, metabolomic analyses of breast muscle and plasma were performed in chickens. The most significant growth-related changes in metabolite levels were observed between seven and 28 days of age. Some of these metabolites are essential nutrients or reported as growth-promoting metabolites. In the muscle, two imidazole dipeptides—carnosine and its methylated metabolite, anserine—increased with the development. These dipeptide levels may be, in part, regulated transcriptionally because in the muscle mRNA levels of carnosine synthase and carnosine methylation enzyme increased. In contrast, taurine levels in the muscle decreased. This would be substrate availability-dependent because some upstream metabolites decreased in the muscle or plasma. In branched-chain amino acid metabolism, valine, leucine, and isoleucine decreased in the muscle, while some of their downstream metabolites decreased in the plasma. The polyamines, putrescine and spermidine, decreased in the muscle. Furthermore, mRNA levels associated with insulin/insulin-like growth factor 1 signaling, which play important roles in muscle growth, increased in the muscle. These results indicate that some metabolic pathways would be important to clarify metabolic characteristics and/or growth of breast muscle during the post-hatch developmental period in chickens.
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Chai J, Sun Z, Xu J. A Contemporary Insight of Metabolomics Approach for Type 1 Diabetes: Potential for Novel Diagnostic Targets. Diabetes Metab Syndr Obes 2022; 15:1605-1625. [PMID: 35642181 PMCID: PMC9148614 DOI: 10.2147/dmso.s357007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 04/08/2022] [Indexed: 11/23/2022] Open
Abstract
High-throughput omics has been widely applied in metabolic disease, type 1 diabetes (T1D) was one of the most typical diseases. Effective prevention and early diagnosis are very important because of infancy and persistent characteristics of T1D. The occurrence and development of T1D is a chronic and continuous process, in which the production of autoantibodies (ie serum transformation) occupies the central position. Metabolomics can evaluate the metabolic characteristics of serum before seroconversion, the changes with age and T1D complications. And the addition of natural drug metabolomics is more conducive to the systematic and comprehensive diagnosis and treatment of T1D. This paper reviewed the metabolic changes and main pathogenesis from pre-diagnosis to treatment in T1D. The metabolic spectrum of significant abnormal energy and glucose-related metabolic pathway, down-regulation of lipid metabolism and up-regulation of some antioxidant pathways has appeared before seroconversion, indicating that the body has been in the dual state of disease progression and disease resistance before T1D onset. Some metabolites (such as methionine) are closely related to age, and the types of autoantibodies produced are age-specific. Some metabolites may jointly predict DN with eGFR, and metabolomics can further contribute to the pathogenesis based on the correlation between DN and DR. Many natural drug components have been proved to act on abnormal metabolic pathways of T1D and have a positive impact on some metabolic levels, which is very important for further finding therapeutic targets and developing new drugs with small side effects. Metabolomics can provide auxiliary value for the diagnosis of T1D and provide a new direction to reveal the pathogenesis of T1D and find new therapeutic targets. The development of T1D metabolomics shows that high-throughput research methods are expected to be introduced into clinical practice.
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Affiliation(s)
- Jiatong Chai
- Department of Laboratory Medicine, The First Hospital of Jilin University, Changchun, People’s Republic of China
| | - Zeyu Sun
- Department of Laboratory Medicine, The First Hospital of Jilin University, Changchun, People’s Republic of China
| | - Jiancheng Xu
- Department of Laboratory Medicine, The First Hospital of Jilin University, Changchun, People’s Republic of China
- Correspondence: Jiancheng Xu, Department of Laboratory Medicine, The First Bethune Hospital of Jilin University, 71 Xinmin Street, Changchun, 130021, People’s Republic of China, Tel +86-431-8878-2595, Fax +86-431-8878-6169, Email
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Williams MB, Palmer JW, Chehade SB, Hall AJ, Barry RJ, Powell ML, Harris ML, Sun LY, Watts SA. Effect of Long-Term Consumption of Poultry Egg Products on Growth, Body Composition, and Liver Gene Expression in Zebrafish, Danio rerio. Curr Dev Nutr 2021; 5:nzab134. [PMID: 34993387 PMCID: PMC8718328 DOI: 10.1093/cdn/nzab134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 09/07/2021] [Accepted: 10/29/2021] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Poultry eggs are a low-cost, high-protein nutrient package that can be consumed as part of quality diets. However, consumption of poultry egg products is historically contentious, which highlights the importance of investigating impacts of long-term egg consumption on metabolic health. OBJECTIVE Our study utilized the zebrafish, Danio rerio, a newly defined model of human metabolic health, to understand the metabolic consequence of consuming egg products in lieu of other well-described protein sources. METHODS Reference diets were formulated to contain multisource protein with casein and fish protein hydrolysate (CON; control protein sources), the protein sources that have been historically utilized in numerous reference diets. These proteins were then partially replaced with either whole egg (WE; protein and lipid source), egg white (EW; protein source), wheat gluten (WG; cereal protein source), or a high-lipid-content diet containing a multisource protein with casein and fish protein hydrolysate (HFCON; isonitrogenous and isolipidic with the WE diet) in a 34-wk trial (n = 8 tanks, 10 fish per tank). Daily feeding was initiated at the early juvenile life stage and terminated at the late reproductive adult stage. RESULTS The amino acid composition of control versus egg product diets did not vary substantially, although methionine and lysine were apparently limiting in fish fed WG. At termination, fish fed EW as the protein source had weight gain and body composition similar to those fed the CON diet. Fasting and postprandial blood glucose did not differ between any dietary treatment. Assessment of the liver transcriptome using RNAseq revealed no differential gene expression between zebrafish fed CON or WE diets. Zebrafish fed WG had lower weight gain in males. CONCLUSIONS Long-term consumption of egg products promoted metabolic health equal to that of historically relevant proteins. These data support the value of egg products for maintaining long-term metabolic health in animal diets.
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Affiliation(s)
- Michael B Williams
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Joseph W Palmer
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Sophie B Chehade
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Alex J Hall
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Robert J Barry
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
- Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Mickie L Powell
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
- Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Melissa L Harris
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Liou Y Sun
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
- Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Stephen A Watts
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
- Nutrition Obesity Research Center, University of Alabama at Birmingham, Birmingham, AL, USA
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Tsunekawa K, Matsumoto R, Ushiki K, Martha L, Shoho Y, Yanagawa Y, Ishigaki H, Yoshida A, Araki O, Nakajima K, Kimura T, Murakami M. Significance of serum branched-chain amino acid to tyrosine ratio measurement in athletes with high skeletal muscle mass. BMC Sports Sci Med Rehabil 2021; 13:1. [PMID: 33397493 PMCID: PMC7784282 DOI: 10.1186/s13102-020-00229-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 12/21/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND Few nutritional markers reflect the hypermetabolic state of athletes with high levels of skeletal muscle. Although branched-chain amino acids (BCAA) play crucial roles in protein metabolism in skeletal muscle, the relationship between skeletal muscle mass and amino acid imbalances caused by the metabolism of BCAA and aromatic amino acids remains unclear. The aim of this study is to test the hypothesis that athletes with high levels of skeletal muscle mass have plasma amino acid imbalances, assessed by serum BCAA to tyrosine ratio (BTR) which can be measured conveniently. METHODS The study enrolled 111 young Japanese men: 70 wrestling athletes and 41 controls. None of them were under any medications, extreme dietary restrictions or intense exercise regimens. Each participant's body composition, serum concentrations of albumin and rapid turnover proteins including transthyretin and transferrin, BTR, and thyroid function were assessed. RESULTS Compared to the controls, the athletes had significantly higher skeletal muscle index (SMI) (p < 0.001), and lower serum albumin concentration (p < 0.001) and BTR (p < 0.001). Kruskal-Wallis tests showed that serum albumin concentration and BTR were significantly lower in the participants with higher SMI. Serum albumin concentration and BTR were inversely correlated with SMI by multiple regression analysis (logarithmic albumin, β = - 0.358, p < 0.001; BTR, β = - 0.299, p = 0.001). SMI was inversely and transthyretin was positively correlated with serum albumin (SMI, β = - 0.554, p < 0.001; transthyretin, β = 0.379, p < 0.001). Serum concentration of free 3,5,3'-triiodothyronine (FT3) was inversely correlated with BTR, and, along with SMI and albumin, was independent predictor of BTR (SMI, β = - 0.321, p < 0.001; FT3, β = - 0.253, p = 0.001; logarithmic albumin, β = 0.261, p = 0.003). However, FT3 was not correlated with SMI or serum albumin. Serum concentrations of rapid turnover proteins were not correlated with BTR. CONCLUSIONS Increased skeletal muscle mass enhances the circulating amino acid imbalances, and is independently facilitated by thyroid hormones. Serum BTR may be a useful biomarker to assess the hypermetabolic state of wrestling athletes with high levels of skeletal muscle.
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Affiliation(s)
- Katsuhiko Tsunekawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan.
| | - Ryutaro Matsumoto
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan.,Graduate School of Health and Sport Science, Nippon Sport Science University, Yokohama, 227-0033, Japan
| | - Kazumi Ushiki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Larasati Martha
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Yoshifumi Shoho
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan.,Faculty of Education, Ikuei University, Takasaki, 370-0011, Japan
| | - Yoshimaro Yanagawa
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan.,Faculty of Education, Ikuei University, Takasaki, 370-0011, Japan
| | - Hirotaka Ishigaki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan.,Department of Medical Technology, Faculty of Health Science, Gunma Paz University, Takasaki, 370-0006, Japan
| | - Akihiro Yoshida
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Osamu Araki
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Kiyomi Nakajima
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Takao Kimura
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan
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van Sloun B, Goossens GH, Erdos B, Lenz M, van Riel N, Arts ICW. The Impact of Amino Acids on Postprandial Glucose and Insulin Kinetics in Humans: A Quantitative Overview. Nutrients 2020; 12:E3211. [PMID: 33096658 PMCID: PMC7594055 DOI: 10.3390/nu12103211] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 11/21/2022] Open
Abstract
Different amino acids (AAs) may exert distinct effects on postprandial glucose and insulin concentrations. A quantitative comparison of the effects of AAs on glucose and insulin kinetics in humans is currently lacking. PubMed was queried to identify intervention studies reporting glucose and insulin concentrations after acute ingestion and/or intravenous infusion of AAs in healthy adults and those living with obesity and/or type 2 diabetes (T2DM). The systematic literature search identified 55 studies that examined the effects of l-leucine, l-isoleucine, l-alanine, l-glutamine, l-arginine, l-lysine, glycine, l-proline, l-phenylalanine, l-glutamate, branched-chain AAs (i.e., l-leucine, l-isoleucine, and l-valine), and multiple individual l-AAs on glucose and insulin concentrations. Oral ingestion of most individual AAs induced an insulin response, but did not alter glucose concentrations in healthy participants. Specific AAs (i.e., leucine and isoleucine) co-ingested with glucose exerted a synergistic effect on the postprandial insulin response and attenuated the glucose response compared to glucose intake alone in healthy participants. Oral AA ingestion as well as intravenous AA infusion was able to stimulate an insulin response and decrease glucose concentrations in T2DM and obese individuals. The extracted information is publicly available and can serve multiple purposes such as computational modeling.
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Affiliation(s)
- Bart van Sloun
- TiFN, 6700 AN Wageningen, The Netherlands; (G.H.G.); (B.E.); (I.C.W.A.)
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Gijs H. Goossens
- TiFN, 6700 AN Wageningen, The Netherlands; (G.H.G.); (B.E.); (I.C.W.A.)
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Balazs Erdos
- TiFN, 6700 AN Wageningen, The Netherlands; (G.H.G.); (B.E.); (I.C.W.A.)
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Michael Lenz
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University Mainz, D 55099 Mainz, Germany;
- Preventive Cardiology and Preventive Medicine-Centre for Cardiology, University Medical Center of the Johannes Gutenberg University Mainz, D 55131 Mainz, Germany
| | - Natal van Riel
- Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;
| | - Ilja C. W. Arts
- TiFN, 6700 AN Wageningen, The Netherlands; (G.H.G.); (B.E.); (I.C.W.A.)
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, 6200 MD Maastricht, The Netherlands
- Department of Epidemiology, CARIM School for Cardiovascular Diseases, Maastricht University, 6200 MD Maastricht, The Netherlands
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9
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Ikeda H. Cross-correlation of plasma concentrations of branched-chain amino acids: A comparison between healthy participants and patients with chronic kidney disease. Clin Nutr ESPEN 2020; 38:201-210. [PMID: 32690159 DOI: 10.1016/j.clnesp.2020.04.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/18/2020] [Accepted: 04/29/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Plasma concentrations of branched-chain amino acids (BCAAs) are known to exhibit strong intercorrelations; however, the associated regulatory mechanism is not sufficiently understood. Furthermore, the mechanisms underlying the intercorrelation changes in metabolic disorders with the disease are unclear. Therefore, plasma BCAAs in patients with chronic kidney disease (CKD) were examined. METHODS This study included a healthy group of older participants (Group C; n = 87, 46 males, 41 females) who had undergone health examinations at Sanyudo Hospital and a group of CKD patients (Group CKD; n = 71, 49 males, 22 females) receiving maintenance hemodialysis at the same hospital. Samples from Group C were collected 12 h after fasting. CKD samples were collected before and after hemodialysis (pre-HD and post-HD, respectively), without 12 h fasting. The samples were analyzed for 38 amino acids by SRL Inc., using liquid chromatography-mass spectrometry (LC-MS). RESULTS Differences between the plasma BCAA concentrations of Group C and pre-HD were determined. Dialysis-induced BCAA losses were different for each BCAA. However, strong intercorrelations between the plasma concentrations of each BCAA were maintained. In addition, the regression lines did not converge at the origin and were in different positions for groups C, pre-HD, and post-HD. A different distribution of the constant (b) for each group was observed for each BCAA correlation when a in the regression line (Y = aX + b) was fixed at the value for Group C, and b was calculated. CONCLUSION Strong intercorrelations among plasma concentrations of BCAAs were maintained in CKD patients both pre- and post-dialysis, whereas the changes in the plasma concentrations of each BCAA were different. We speculate that there is a novel mechanism that selectively regulates each BCAA and suggest that changes in the constant of the regression formula for correlation may have a novel function as an index for renal contribution to BCAA metabolism.
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Affiliation(s)
- Hideki Ikeda
- Department of Internal Medicine, Sanyudo Hospital, Chuo 6-1-219, Yonezawa, Yamagata 992-0045, Japan.
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10
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Hosseinpour-Niazi S, Tahmasebinejad Z, Esfandiar Z, Bakhshi B, Mirmiran P, Azizi F. Weight gain, but not macronutrient intake, modifies the effect of dietary branch chain amino acids on the risk of metabolic syndrome. Diabetes Res Clin Pract 2020; 161:108039. [PMID: 32007512 DOI: 10.1016/j.diabres.2020.108039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 01/20/2020] [Accepted: 01/27/2020] [Indexed: 12/28/2022]
Abstract
AIMS The aim of this study was to investigate whether both weight change and the background intakes of macronutrient modulate the association between dietary branch chain amino acids (BCAAs) and the risk of metabolic syndrome (MetS). METHODS This prospective study was conducted within the framework of theTehranLipidand Glucose Study. BCAA intakes were collected using a valid and reliable semi-quantitative food frequency questionnaire. MetS components were defined according to the modified national Cholesterol Education Program Adult Treatment Panel III. Weight change was categorized as weight gain (≥ or <7% over 8.9 year follow-up). Dietary fat and carbohydrate intake were categorized as above/below the median intake. RESULTS Among participants with weight gain ≥ 7% during follow-up, intakes of both dietary BCAAs and its various sources (below or above the median intake) were associated with higher risk of MetS, compared with subjects with lower intakes of BCAAs and weight change ≤ 7%. Background dietary fat and carbohydrate did not modify the association of dietary BCAAs and its various sources with the risk of MetS. CONCLUSIONS Weight change, but not dietary macronutrient intake, modulates the association between dietary BCAAs and risk of MetS among adults.
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Affiliation(s)
- Somayeh Hosseinpour-Niazi
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zhale Tahmasebinejad
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zohre Esfandiar
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bahar Bakhshi
- Nutrition and Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Parvin Mirmiran
- Department of Clinical Nutrition and Dietetics, Faculty of Nutrition Sciences and Food Technology, National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Fereidoun Azizi
- Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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11
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Viana LR, Tobar N, Busanello ENB, Marques AC, de Oliveira AG, Lima TI, Machado G, Castelucci BG, Ramos CD, Brunetto SQ, Silveira LR, Vercesi AE, Consonni SR, Gomes-Marcondes MCC. Leucine-rich diet induces a shift in tumour metabolism from glycolytic towards oxidative phosphorylation, reducing glucose consumption and metastasis in Walker-256 tumour-bearing rats. Sci Rep 2019; 9:15529. [PMID: 31664147 PMCID: PMC6820796 DOI: 10.1038/s41598-019-52112-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 10/14/2019] [Indexed: 11/09/2022] Open
Abstract
Leucine can stimulate protein synthesis in skeletal muscle, and recent studies have shown an increase in leucine-related mitochondrial biogenesis and oxidative phosphorylation capacity in muscle cells. However, leucine-related effects in tumour tissues are still poorly understood. Thus, we described the effects of leucine in both in vivo and in vitro models of a Walker-256 tumour. Tumour-bearing Wistar rats were randomly distributed into a control group (W; normoprotein diet) and leucine group (LW; leucine-rich diet [normoprotein + 3% leucine]). After 20 days of tumour evolution, the animals underwent 18-fludeoxyglucose positron emission computed tomography (18F-FDG PET-CT) imaging, and after euthanasia, fresh tumour biopsy samples were taken for oxygen consumption rate measurements (Oroboros Oxygraph), electron microscopy analysis and RNA and protein extraction. Our main results from the LW group showed no tumour size change, lower tumour glucose (18F-FDG) uptake, and reduced metastatic sites. Furthermore, leucine stimulated a shift in tumour metabolism from glycolytic towards oxidative phosphorylation, higher mRNA and protein expression of oxidative phosphorylation components, and enhanced mitochondrial density/area even though the leucine-treated tumour had a higher number of apoptotic nuclei with increased oxidative stress. In summary, a leucine-rich diet directed Walker-256 tumour metabolism to a less glycolytic phenotype profile in which these metabolic alterations were associated with a decrease in tumour aggressiveness and reduction in the number of metastatic sites in rats fed a diet supplemented with this branched-chain amino acid.
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Affiliation(s)
- Laís Rosa Viana
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Natália Tobar
- Division of Nuclear Medicine, Department of Radiology, School of Medical Sciences, University of Campinas, Campinas, SP, Brazil
| | | | - Ana Carolina Marques
- School of Medical Sciences, Department of Clinical Pathology, State University of Campinas, Campinas, SP, Brazil
| | - Andre Gustavo de Oliveira
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas, Campinas, SP, Brazil.,Obesity and Comorbidities Research Centre, Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Tanes I Lima
- Obesity and Comorbidities Research Centre, Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Gabrielly Machado
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Bianca Gazieri Castelucci
- Laboratory of Cytochemistry and Immunocytochemistry, Department of Biochemistry and Tissue Biology. Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Celso Dario Ramos
- Division of Nuclear Medicine, Department of Radiology, School of Medical Sciences, University of Campinas, Campinas, SP, Brazil
| | - Sérgio Q Brunetto
- Division of Nuclear Medicine, Department of Radiology, School of Medical Sciences, University of Campinas, Campinas, SP, Brazil
| | - Leonardo Reis Silveira
- Obesity and Comorbidities Research Centre, Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Anibal Eugenio Vercesi
- School of Medical Sciences, Department of Clinical Pathology, State University of Campinas, Campinas, SP, Brazil
| | - Sílvio Roberto Consonni
- Laboratory of Cytochemistry and Immunocytochemistry, Department of Biochemistry and Tissue Biology. Biology Institute, University of Campinas, Campinas, SP, Brazil
| | - Maria Cristina Cintra Gomes-Marcondes
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas, Campinas, SP, Brazil.
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12
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Welch-Jernigan RJ, Abrahamse E, Stoll B, Smith O, Wierenga PA, van de Heijning BJM, Renes IB, Burrin DG. Postprandial Amino Acid Kinetics of Milk Protein Mixtures are Affected by Composition, But Not Denaturation, in Neonatal Piglets. Curr Dev Nutr 2019; 3:nzy102. [PMID: 30963144 PMCID: PMC6447734 DOI: 10.1093/cdn/nzy102] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/20/2018] [Accepted: 12/18/2018] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Multiple studies have indicated that formula-fed infants show a different growth trajectory compared with breastfed infants. The observed growth rates are suggested to be linked to higher postprandial levels of branched chain amino acids (BCAAs) and insulin related to differences in protein quality. OBJECTIVE We evaluated the effects of milk protein denaturation and milk protein composition on postprandial plasma and hormone concentrations. METHODS Neonatal piglets were bolus-fed randomly, in an incomplete crossover design, 2 of 3 milk protein solutions: native whey protein isolate (NWPI), denatured whey protein isolate (DWPI), or protein base ingredient, comprising whey and casein (PBI). Postprandial plasma amino acids (AAs), insulin, glucagon-like peptide 1, glucose, and paracetamol concentrations were assayed. Plasma responses were fitted with a model of first-order absorption with linear elimination. RESULTS DWPI (91% denatured protein) compared with NWPI (91% native protein) showed lower essential amino acids (EAAs) (∼10%) and BCAA (13-19%) concentrations in the first 30-60 min. However, total amino acid (TAA) concentration per time-point and area under the curve (AUC), as well as EAA and BCAA AUC were not different. PBI induced a ∼30% lower postprandial insulin spike than NWPI, yet plasma TAA concentration at several time-points and AUC was higher in PBI than in NWPI. The TAA rate constant for absorption (k a) was twofold higher in PBI than in NWPI. Plasma BCAA levels from 60 to 180 min and AUC were higher in PBI than in NWPI. Plasma EAA concentrations and AUCs in PBI and NWPI were not different. CONCLUSIONS Denaturation of WPI had a minimal effect on postprandial plasma AA concentration. The differences between PBI and NWPI were partly explained by the difference in AA composition, but more likely differences in protein digestion and absorption kinetics. We conclude that modifying protein composition, but not denaturation, of milk protein solutions impacts the postprandial amino acid availability in neonatal piglets.
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Affiliation(s)
| | - Evan Abrahamse
- Danone Nutricia Research, Utrecht, the Netherlands
- Laboratory of Food Chemistry, Wageningen University, Wageningen, the Netherlands
| | - Barbara Stoll
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - O'Brian Smith
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Peter A Wierenga
- Laboratory of Food Chemistry, Wageningen University, Wageningen, the Netherlands
| | | | - Ingrid B Renes
- Danone Nutricia Research, Utrecht, the Netherlands
- Department of Pediatrics, Emma Children's Hospital AMC, Amsterdam, the Netherlands
| | - Douglas G Burrin
- Center for Comparative Medicine, Baylor College of Medicine, Houston, TX
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX
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13
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Inoue S, Ikeda H. Differences in plasma amino acid levels in patients with and without bacterial infection during the early stage of acute exacerbation of COPD. Int J Chron Obstruct Pulmon Dis 2019; 14:575-583. [PMID: 30880947 PMCID: PMC6402618 DOI: 10.2147/copd.s188422] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
PURPOSE No consensus has been reached regarding appropriate nutritional intervention and rehabilitation during early acute exacerbation of COPD (AECOPD). Given the individual differences in symptoms of AECOPD, patients should be classified by their pathology. For example, it is known that there are differences in the inflammatory response between AECOPD with and without bacterial infection. However, there have been few reports on AECOPD from a nutritional perspective. The aim of this study was to investigate amino acid levels in patients with AECOPD. PATIENTS AND METHODS Blood was collected from patients who were hospitalized with AECOPD and from patients with COPD that was in a stable state. We divided the patients with AECOPD into those without bacterial infection (group A) and those with bacterial infection (group B). The patients with COPD that was stable served as controls (group C). The plasma levels of 9 essential amino acids, 13 nonessential amino acids, and total amino acids were compared between the three groups. RESULTS In the early stages of AECOPD, differences in plasma levels of only three amino acids (glycine, phenylalanine, and arginine) were observed between groups C and A. Differences in total amino acids and 13 amino acids were observed between groups C and B. Group B had lower levels of total amino acids and of seven amino acids (asparagine, citrulline, glutamine, histidine, methionine, serine, and threonine) compared with the other study groups. CONCLUSION The findings of this study show that amino acid levels in plasma differ in patients with AECOPD depending on whether or not bacterial infection is present. Our results suggest that specific amino acids (ie, asparagine, citrulline, glutamine, histidine, serine, and threonine) have potential utility as diagnostic markers to distinguish between bacterial and nonbacterial AECOPD.
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Affiliation(s)
- Saki Inoue
- Department of Nutritional Management, Sanyudo Hospital, Yonezawa, Japan
| | - Hideki Ikeda
- Pulmonary Division, Department of Internal Medicine, Sanyudo Hospital, Yonezawa, Japan,
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14
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Okekunle AP, Zhang M, Wang Z, Onwuka JU, Wu X, Feng R, Li C. Dietary branched-chain amino acids intake exhibited a different relationship with type 2 diabetes and obesity risk: a meta-analysis. Acta Diabetol 2019; 56:187-195. [PMID: 30413881 DOI: 10.1007/s00592-018-1243-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 10/09/2018] [Indexed: 12/13/2022]
Abstract
AIM To assess whether oral branched-chain amino acids (BCAA) supplementation exerts influence on circulating BCAA and the significance of dietary BCAA in type 2 diabetes and obesity risk. METHOD We searched PUBMED, EMBASE and Cochrane library through June 2018 to retrieve and screen published reports for inclusion in the meta-analysis after methodological assessment. Heterogeneity of studies was evaluated using I2 statistics, while sensitivity analysis and funnel plot were used to evaluate the potential effect of individual studies on the overall estimates and publication bias, respectively, using RevMan 5.3. RESULT Eight articles on randomized clinical trial of oral BCAA supplementation, and seven articles on dietary BCAA intake and type 2 diabetes/obesity risks were eligible for inclusion in our meta-analyses. Mean difference and 95% confidence interval (CI) of circulating leucine was 39.65 (3.54, 75.76) µmol/L, P = 0.03 post-BCAA supplementation. Also, OR and 95% CI for higher total BCAA intake and metabolic disorder risks were, 1.32 (1.14, 1.53), P = 0.0003-type 2 diabetes and 0.62 (0.47, 0.82), P = 0.0008-obesity. CONCLUSION Oral BCAA supplementation exerts modest influence on circulating leucine profile and higher total BCAA intake is positively and contra-positively associated with type 2 diabetes and obesity risk, respectively.
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Affiliation(s)
- Akinkunmi Paul Okekunle
- Department of General Surgery, Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China
- Department of Nutrition and Food Hygiene, College of Public Health, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China
| | - Meng Zhang
- Department of Nutrition and Food Hygiene, College of Public Health, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China
| | - Zhen Wang
- Mudanjiang City Health Supervision, Mudanjiang, Heilongjiang, People's Republic of China
| | - Justina Ucheojor Onwuka
- Department of Epidemiology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China
| | - Xiaoyan Wu
- Department of Nutrition and Food Hygiene, College of Public Health, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China
| | - Rennan Feng
- Department of Nutrition and Food Hygiene, College of Public Health, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China.
| | - Chunlong Li
- Department of General Surgery, Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang, 150081, People's Republic of China.
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15
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Maki H, Yamanaka-Okumura H, Katayama T, Ozawa Y, Hosoda A, Kurata N, Amemiya F. Late evening snacks with branched-chain amino acids improve the Fischer ratio with patients liver cirrhosis at fasting in the next morning. Clin Nutr ESPEN 2019; 30:138-144. [PMID: 30904214 DOI: 10.1016/j.clnesp.2019.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/17/2018] [Accepted: 01/07/2019] [Indexed: 01/01/2023]
Abstract
BACKGROUND & AIMS A late evening snack (LES) is recommended as a nutritional therapy for liver cirrhosis to minimize early starvation. In patients with liver cirrhosis, the maintenance of the branched-chain amino acid (BCAA) levels is important during muscle synthesis at night. Therefore, we investigated the effects of a LES with BCAAs on the Fischer ratio in patients with liver cirrhosis. METHODS This study included 10 outpatients with liver cirrhosis who did not consume a LES. Regarding the patient characteristics, the mean age was 73.1 ± 8.9 years, the male:female ratio was 5:5, and the mean body mass index was 23.3 ± 2.4 kg/m2. The etiology was hepatitis C virus in eight patients and alcoholism in two patients. Amino acid levels were measured in all 10 patients at four time points: before LES (control) and 1 month after the administration of each BCAA. The administration levels included 1) LES: BCAA-enriched enteral nutrition (BCAA-EN) containing BCAAs 6.1 g as a LES; 2) GP-no LES: BCAA-enriched granule product (BCAA-GP) containing 4 g BCAAs per pack, two packs per day, and BCAA-EN until dinner containing BCAAs in total 14.1 g per day; and 3) GP-LES: BCAA-GP, two packs per day, and BCAA-EN as a LES containing BCAAs in total 14.1 g per day. The Friedman nonparametric test with a post-hoc Dunn's multiple comparison was used for statistical analyses. RESULTS There were no significant changes in body weight and serum albumin levels between the three types of BCAA administration. Valine significantly increased following LES and GP-LES, isoleucine significantly increased following GP-LES, and tyrosine significantly decreased following LES and GP-LES compared with those in the control. There was no significant difference in the leucine and phenylalanine levels among the groups. The Fischer ratio in the LES (2.2 ± 0.8) and GP-LES (2.3 ± 0.8) groups were significantly higher than that in the control (1.8 ± 0.6), but there was no significant difference compared with the Fischer ratio in the GP-no LES (1.8 ± 0.7) group. Furthermore, the Fischer ratio was significantly higher in the GP-LES group than in the GP-no LES group. CONCLUSION These results suggested that it is not only the amount of BCAAs, but also LES with BCAAs, which is needed to improve the Fischer ratio at fasting.
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Affiliation(s)
- Hiroki Maki
- Department of Pharmacy, Kofu Municipal Hospital, Kofu, Yamanashi, Japan
| | - Hisami Yamanaka-Okumura
- Department of Clinical Nutrition and Food Management, Institute of Biomedical Sciences, Tokushima University Graduate School, Kuramoto-cho, Tokushima, Japan.
| | - Takafumi Katayama
- Department of Statistics and Computer Science, College of Nursing Art and Science, University of Hyogo, Hyogo, Japan
| | - Yuka Ozawa
- Department of Nutrition Management, Kofu Municipal Hospital, Kofu, Yamanashi, Japan
| | - Akihito Hosoda
- Department of Pharmacy, Kofu Municipal Hospital, Kofu, Yamanashi, Japan
| | - Naomi Kurata
- Department of Healthcare and Regulatory Sciences, Showa University School of Pharmacy, Tokyo, Japan
| | - Fumitake Amemiya
- Department of Internal Medicine, Kofu Municipal Hospital, Kofu, Yamanashi, Japan
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16
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Tajiri K, Shimizu Y. Branched-chain amino acids in liver diseases. Transl Gastroenterol Hepatol 2018; 3:47. [PMID: 30148232 PMCID: PMC6088198 DOI: 10.21037/tgh.2018.07.06] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/06/2018] [Indexed: 02/05/2023] Open
Abstract
Branched chain amino acids (BCAAs) are involved in various bioprocess such as protein metabolism, gene expression, insulin resistance and proliferation of hepatocytes. BCAAs have also been reported to suppress the growth of hepatocellular carcinoma (HCC) cells in vitro and to be required for immune cells to perform the function. In advanced cirrhotic patients, it has been clarified that serum concentrations of BCAA are decreased, whereas those of aromatic amino acids (AAAs) are increased. These alterations are thought to be the causes of hepatic encephalopathy (HE), sarcopenia and hepatocarcinogenesis and may be associated with the poor prognosis of patients with these conditions. Administration of BCAA-rich medicines has shown positive results in patients with cirrhosis.
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Affiliation(s)
- Kazuto Tajiri
- Department of Gastroenterology, Toyama University Hospital, Toyama, Japan
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17
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Everman S, Meyer C, Tran L, Hoffman N, Carroll CC, Dedmon WL, Katsanos CS. Insulin does not stimulate muscle protein synthesis during increased plasma branched-chain amino acids alone but still decreases whole body proteolysis in humans. Am J Physiol Endocrinol Metab 2016; 311:E671-E677. [PMID: 27530230 PMCID: PMC5241558 DOI: 10.1152/ajpendo.00120.2016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 08/10/2016] [Indexed: 01/19/2023]
Abstract
Insulin stimulates muscle protein synthesis when the levels of total amino acids, or at least the essential amino acids, are at or above their postabsorptive concentrations. Among the essential amino acids, branched-chain amino acids (BCAA) have the primary role in stimulating muscle protein synthesis and are commonly sought alone to stimulate muscle protein synthesis in humans. Fourteen healthy young subjects were studied before and after insulin infusion to examine whether insulin stimulates muscle protein synthesis in relation to the availability of BCAA alone. One half of the subjects were studied in the presence of postabsorptive BCAA concentrations (control) and the other half in the presence of increased plasma BCAA (BCAA). Compared with that prior to the initiation of the insulin infusion, fractional synthesis rate of muscle protein (%/h) did not change (P > 0.05) during insulin in either the control (0.04 ± 0.01 vs 0.05 ± 0.01) or the BCAA (0.05 ± 0.02 vs. 0.05 ± 0.01) experiments. Insulin decreased (P < 0.01) whole body phenylalanine rate of appearance (μmol·kg-1·min-1), indicating suppression of muscle proteolysis, in both the control (1.02 ± 0.04 vs 0.76 ± 0.04) and the BCAA (0.89 ± 0.07 vs 0.61 ± 0.03) experiments, but the change was not different between the two experiments (P > 0.05). In conclusion, insulin does not stimulate muscle protein synthesis in the presence of increased circulating levels of plasma BCAA alone. Insulin's suppressive effect on proteolysis is observed independently of the levels of circulating plasma BCAA.
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Affiliation(s)
- Sarah Everman
- Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
| | - Christian Meyer
- Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
| | - Lee Tran
- Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona; Mayo Clinic in Arizona, Scottsdale, Arizona; and
| | - Nyssa Hoffman
- Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona; Mayo Clinic in Arizona, Scottsdale, Arizona; and
| | | | | | - Christos S Katsanos
- Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona; Mayo Clinic in Arizona, Scottsdale, Arizona; and
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Effect of Oral Branched-Chain Amino Acid Supplementation Prior to Resistance Exercise on Metabolic Hormones, Plasma Amino Acids, and Serum Indices of Muscle Damage in the Recovery Period. TOP CLIN NUTR 2016. [DOI: 10.1097/tin.0000000000000085] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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19
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Yao K, Duan Y, Li F, Tan B, Hou Y, Wu G, Yin Y. Leucine in Obesity: Therapeutic Prospects. Trends Pharmacol Sci 2016; 37:714-727. [DOI: 10.1016/j.tips.2016.05.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/08/2016] [Accepted: 05/10/2016] [Indexed: 02/07/2023]
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20
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Fouré A, Nosaka K, Gastaldi M, Mattei JP, Boudinet H, Guye M, Vilmen C, Le Fur Y, Bendahan D, Gondin J. Effects of branched-chain amino acids supplementation on both plasma amino acids concentration and muscle energetics changes resulting from muscle damage: A randomized placebo controlled trial. Clin Nutr 2016; 35:83-94. [PMID: 25886707 DOI: 10.1016/j.clnu.2015.03.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 03/03/2015] [Accepted: 03/24/2015] [Indexed: 01/22/2023]
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21
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Frohnert BI, Rewers MJ. Metabolomics in childhood diabetes. Pediatr Diabetes 2016; 17:3-14. [PMID: 26420304 PMCID: PMC4703499 DOI: 10.1111/pedi.12323] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/20/2015] [Accepted: 08/21/2015] [Indexed: 12/30/2022] Open
Abstract
Recent increases in the incidence of both type 1 (T1D) and type 2 diabetes (T2D) in children and adolescents point to the importance of environmental factors in the development of these diseases. Metabolomic analysis explores the integrated response of the organism to environmental changes. Metabolic profiling can identify biomarkers that are predictive of disease incidence and development, potentially providing insight into disease pathogenesis. This review provides an overview of the role of metabolomic analysis in diabetes research and summarizes recent research relating to the development of T1D and T2D in children.
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Affiliation(s)
- Brigitte I Frohnert
- Barbara Davis Center for Childhood Diabetes; University of Colorado; Aurora CO 80045 USA
| | - Marian J Rewers
- Barbara Davis Center for Childhood Diabetes; University of Colorado; Aurora CO 80045 USA
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22
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Li YC, Li Y, Liu LY, Chen Y, Zi TQ, Du SS, Jiang YS, Feng RN, Sun CH. The Ratio of Dietary Branched-Chain Amino Acids is Associated with a Lower Prevalence of Obesity in Young Northern Chinese Adults: An Internet-Based Cross-Sectional Study. Nutrients 2015; 7:9573-89. [PMID: 26593945 PMCID: PMC4663614 DOI: 10.3390/nu7115486] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 11/03/2015] [Accepted: 11/11/2015] [Indexed: 12/27/2022] Open
Abstract
This study aims to examine the association between the ratio of dietary branched chain amino acids (BCAA) and risk of obesity among young northern Chinese adults. A total of 948 randomly recruited participants were asked to finish our internet-based dietary questionnaire for the Chinese (IDQC). Associations between dietary BCAA ratio and prevalence of overweight/obesity and abdominal obesity were analyzed. Furthermore, 90 subjects were randomly selected to explore the possible mechanism. Dietary BCAA ratio in obese participants was significantly lower than non-obese participants. We found negative correlations between the ratio of dietary BCAA and body mass index (BMI) (r = −0.197, p < 0.001) or waist circumference (r = −0.187, p < 0.001). Compared with those in the first quartile, the multivariable-adjusted OR (95% CI) of the 3rd and 4th quartiles of dietary BCAA ratio for overweight/obesity were 0.508 (0.265–0.972) and 0.389 (0.193–0.783), respectively (all p < 0.05). After stratification by gender, the significance still existed in the 3rd and 4th quartile in males and the 4th quartile in females. For abdominal obesity, the multivariable-adjusted OR (95% CI) of the 3rd and 4th quartile of dietary BCAA ratio were 0.351 (0.145–0.845) and 0.376 (0.161–0.876), respectively (all p < 0.05). This significance was stronger in males. Further studies indicated that dietary BCAA ratio was inversely associated with 2-h postprandial glucose (2 h-PG) and status of inflammation. In conclusion, a higher ratio of dietary BCAA is inversely associated with prevalence of obesity, postprandial glucose and status of inflammation in young northern Chinese adults.
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Affiliation(s)
- Yan-Chuan Li
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Ying Li
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Li-Yan Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Yang Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Tian-Qi Zi
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Shan-Shan Du
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Yong-Shuai Jiang
- College of Bioinformatics Science and Technology, Harbin Medical University, Harbin 150086, China.
| | - Ren-Nan Feng
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
| | - Chang-Hao Sun
- Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin 150086, China.
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Fu L, Bruckbauer A, Li F, Cao Q, Cui X, Wu R, Shi H, Zemel MB, Xue B. Leucine amplifies the effects of metformin on insulin sensitivity and glycemic control in diet-induced obese mice. Metabolism 2015; 64:845-56. [PMID: 25858853 DOI: 10.1016/j.metabol.2015.03.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 03/11/2015] [Accepted: 03/13/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND OBJECTIVE The Sirt1/AMPK signaling pathway is a key sensor of energy status and regulates glucose and lipid metabolism. Leucine (Leu) activates Sirt1 by lowering its Km for NAD(+) and potentiates other sirtuin/AMPK-activators, resulting in improvement of insulin sensitivity. Since metformin (Met) converges on this pathway, we hypothesized that leucine would amplify its gluco-regulatory effects. MATERIALS AND METHODS The effects of Leu (24 g/kg diet)+Met (0.05-0.5 g/kg diet) combinations were compared to standard therapeutic Met (1.5 g/kg diet; ~300 mg/kg BW) on glycemic control in high fat diet induced insulin resistant mice for 6 weeks. The effects of Leu on Met stimulation of Sirt1 and AMPK activities were further evaluated in adipocytes. RESULTS Sub-therapeutic levels of Met combined with Leu resulted in increases in Sirt1 activity and in tissue P-AMPK/AMPK ratio and corresponding dose-responsive improvements in fasting and post-prandial glucose, in glucose response to an insulin tolerance test and in the area under the curve in glucose tolerance tests. Changes were evident within 7 days of treatment and sustained throughout the 6-week study duration. The Leu+Met (0.25 g/kg)-combinations produced a comparable effect to a standard therapeutic Met dose, while the Leu+Met (0.5 g/kg diet) resulted in greater improvements. Since resveratrol also synergizes with leucine to augment sirtuin signaling and insulin sensitivity, we tested the addition of resveratrol to Leu-Met and found no additional benefit. CONCLUSION These data demonstrate that adding Leu to Met enables a dose reduction of 66% with improved efficacy and of 83% with comparable efficacy to standard metformin in diet-induced obese mice, and addition of resveratrol does not provide further benefit.
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Affiliation(s)
- Lizhi Fu
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | | | - Fenfen Li
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | - Qiang Cao
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | - Xin Cui
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | - Rui Wu
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | - Hang Shi
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA
| | | | - Bingzhong Xue
- Center for Obesity Reversal, Department of Biology, Georgia State University, Atlanta, GA.
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Matsumoto T, Nakamura K, Matsumoto H, Sakai R, Kuwahara T, Kadota Y, Kitaura Y, Sato J, Shimomura Y. Bolus ingestion of individual branched-chain amino acids alters plasma amino acid profiles in young healthy men. SPRINGERPLUS 2014; 3:35. [PMID: 25674427 PMCID: PMC4320164 DOI: 10.1186/2193-1801-3-35] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 12/26/2013] [Indexed: 12/17/2022]
Abstract
Physiological conditions in humans affect plasma amino acid profiles that might have potential for medical use. Because the branched-chain amino acids (BCAAs) leucine, isoleucine and valine are used as medicines and supplements, we investigated the acute effects of individual BCAAs (10-90 mg/kg body weight) or mixed BCAAs ingested as a bolus on plasma amino acid profiles in young healthy men. Plasma leucine levels rapidly increased and peaked around 30 min after leucine ingestion. Concentrations of plasma isoleucine, valine and phenylalanine subsequently decreased after ingestion, and those of methionine and tyrosine tended to decrease. The effects of ingested leucine on other plasma amino acids were biphasic, being higher at lower doses (10-20 mg/kg body weight). Isoleucine or valine intake also caused corresponding plasma amino acid concentrations to rapidly elevate, and peaks at 30-40 min after ingestion were much higher than that of plasma leucine after leucine ingestion. However, the increase in plasma isoleucine and valine concentrations essentially did not affect those of other plasma amino acids. The rate of decline among peak plasma BCAA concentrations was the highest for leucine, followed by isoleucine and valine. Oral mixed BCAAs promoted the decline in plasma isoleucine and valine concentrations. These results suggest that plasma leucine is a regulator of the plasma concentrations of BCAAs, methionine and aromatic amino acids.
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Affiliation(s)
- Takuya Matsumoto
- Department of General Medicine/Family and Community Medicine, Nagoya University Graduate School of Medicine, Nagoya, 466-8560 Japan
| | - Koichi Nakamura
- Laboratory of Nutritional Biochemistry, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Hideki Matsumoto
- Institute for Innovation, Ajinomoto Co., Inc., Kawasaki, 210-8681 Japan
| | - Ryosei Sakai
- Institute for Innovation, Ajinomoto Co., Inc., Kawasaki, 210-8681 Japan
| | - Tomomi Kuwahara
- Institute for Innovation, Ajinomoto Co., Inc., Kawasaki, 210-8681 Japan
| | - Yoshihiro Kadota
- Laboratory of Nutritional Biochemistry, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Yasuyuki Kitaura
- Laboratory of Nutritional Biochemistry, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Juichi Sato
- Department of General Medicine/Family and Community Medicine, Nagoya University Graduate School of Medicine, Nagoya, 466-8560 Japan
| | - Yoshiharu Shimomura
- Laboratory of Nutritional Biochemistry, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
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Kim DH, Kim SH, Jeong WS, Lee HY. Effect of BCAA intake during endurance exercises on fatigue substances, muscle damage substances, and energy metabolism substances. J Exerc Nutrition Biochem 2013; 17:169-80. [PMID: 25566428 PMCID: PMC4241904 DOI: 10.5717/jenb.2013.17.4.169] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 11/19/2013] [Accepted: 11/28/2013] [Indexed: 11/04/2022] Open
Abstract
The increase rate of utilization of branched-chain amino acids (BCAA) by muscle is reduced to its plasma concentration during prolonged exercise leading to glycogen. BCAA supplementation would reduce the serum activities of intramuscular enzymes associated with muscle damage. To examine the effects of BCAA administration on fatigue substances (serotonin, ammonia and lactate), muscle damage substances (CK and LDH) and energy metabolism substances (FFA and glucose) after endurance exercise. Subjects (n = 26, college-aged males) were randomly divided into an experimental (n = 13, EXP) and a placebo (n = 13, CON) group. Subjects both EXP and CON performed a bout of cycle training (70% VO2max intensity) to exhaustion. Subject in the EXP were administrated BCAA (78ml/kg·w) prior to the bout of cycle exercise. Fatigue substances, muscle damage substances and energy metabolism substances were measured before ingesting BCAAs and placebos, 10 min before exercise, 30 min into exercise, immediately after exercise, and 30 min after exercise. Data were analyzed by two-way repeated measure ANCOVA, correlation and statistical significance was set at p < 0.05. The following results were obtained from this study; 1. In the change of fatigue substances : Serotonin in the EXP tended to decreased at the 10 min before exercise, 30 min into exercise, post exercise, and recovery 30 min. Serotonin in the CON was significantly greater than the EXP at the10 min before exercise and recovery 30. Ammonia in the EXP was increased at the 10 min before exercise, 30 min into exercise, and post exercise, but significantly decreased at the recovery 30min (p < 0.05). Ammonia in the CON was significantly lower than the EXP at the 10 min before exercise, 30 min into exercise, and post exercise (p < 0.05). Lactate in the EXP was significantly increased at the 30 min into exercise and significantly decreased at the post exercise and recovery 30 min. Lactate in the CON was significantly lower than the EXP at the post exercise (p < 0.05). 2. In the change of muscle damage substances : CK in the EXP was decreased at the 10 min before exercise and increased at the 30 min into exercise and then decreased at the post exercise and recovery 30 min. CK in the CON was greater than the EXP. LDH in the EXP was decreased at the 10 min before exercise and increased at the 30 min into exercise and then decreased at the post exercise and recovery 30 min. LDH in the CON was higher than the EXP. 3. In the change of energy metabolism substances :Glucose in the EXP tended to decrease at the 10 min before exercise, 30 min into exercise, post exercise and recovery 30 min. Glucose in the CON was significantly greater than the EXP at the recovery 30 min (p < .05). FFA in both EXP and CON was increased at the post exercise and recovery 30 min. % increase for FFA in the EXP was greater than the CON at the post exercise and recovery 30 min. 4. The relationship of the fatigue substances, muscle damage substances and energy metabolism substances after endurance exercise indicated strongly a positive relationship between LDH and ammonia and a negative relationship between LDH and FFA in the EXP. Also, there were a strong negative relationship between glucose and FFA and a positive relationship between glucose and serotonin in the EXP. There was a strong positive relationship between CK and LDH and a strong negative relationship between FFA and glucose in the CON. These results indicate that supplementary BCAA decreased serum concentrations of the intramuscular enzymes as CK and LDH following exhaustive exercise. This observation suggests that BCAA supplementation may reduce the muscle damage associated with endurance exercise.
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Affiliation(s)
- Dong-Hee Kim
- Department of Physical Education, Chonnam National University, Gwangju, Korea
| | - Seok-Hwan Kim
- Department of Physical Education, Chonnam National University, Gwangju, Korea
| | - Woo-Seok Jeong
- Department of Physical Education, Chonnam National University, Gwangju, Korea
| | - Ha-Yan Lee
- Department of Sports Leisure, Nambu university, Gwangju, Korea
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Tajiri K, Shimizu Y. Branched-chain amino acids in liver diseases. World J Gastroenterol 2013; 19:7620-7629. [PMID: 24282351 PMCID: PMC3837260 DOI: 10.3748/wjg.v19.i43.7620] [Citation(s) in RCA: 127] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 08/02/2013] [Accepted: 09/17/2013] [Indexed: 02/06/2023] Open
Abstract
Branched chain amino acids (BCAAs) have been shown to affect gene expression, protein metabolism, apoptosis and regeneration of hepatocytes, and insulin resistance. They have also been shown to inhibit the proliferation of liver cancer cells in vitro, and are essential for lymphocyte proliferation and dendritic cell maturation. In patients with advanced chronic liver disease, BCAA concentrations are low, whereas the concentrations of aromatic amino acids such as phenylalanine and tyrosine are high, conditions that may be closely associated with hepatic encephalopathy and the prognosis of these patients. Based on these basic observations, patients with advanced chronic liver disease have been treated clinically with BCAA-rich medicines, with positive effects.
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Nostell KEA, Essén-Gustavsson B, Bröjer JT. Repeated post-exercise administration with a mixture of leucine and glucose alters the plasma amino acid profile in Standardbred trotters. Acta Vet Scand 2012; 54:7. [PMID: 22296999 PMCID: PMC3292998 DOI: 10.1186/1751-0147-54-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Accepted: 02/01/2012] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The branched chain amino acid leucine is a potent stimulator of insulin secretion. Used in combination with glucose it can increase the insulin response and the post exercise re-synthesis of glycogen in man. Decreased plasma amino acid concentrations have been reported after intravenous or per oral administration of leucine in man as well as after a single per oral dose in horses. In man, a negative correlation between the insulin response and the concentrations of isoleucine, valine and methionine have been shown but results from horses are lacking. This study aims to determine the effect of repeated per oral administration with a mixture of glucose and leucine on the free amino acid profile and the insulin response in horses after glycogen-depleting exercise. METHODS In a crossover design, after a glycogen depleting exercise, twelve Standardbred trotters received either repeated oral boluses of glucose, 1 g/kg body weight (BW) at 0, 2 and 4 h with addition of leucine 0.1 g/kg BW at 0 and 4 h (GLU+LEU), or repeated boluses of water at 0, 2 and 4 h (CON). Blood samples for analysis of glucose, insulin and amino acid concentrations were collected prior to exercise and over a 6 h post-exercise period. A mixed model approach was used for the statistical analyses. RESULTS Plasma leucine, isoleucine, valine, tyrosine and phenylalanine concentrations increased after exercise. Post-exercise serum glucose and plasma insulin response were significantly higher in the GLU+LEU treatment compared to the CON treatment. Plasma leucine concentrations increased after supplementation. During the post-exercise period isoleucine, valine and methionine concentrations decreased in both treatments but were significantly lower in the GLU+LEU treatment. There was no correlation between the insulin response and the response in plasma leucine, isoleucine, valine and methionine. CONCLUSIONS Repeated post-exercise administration with a mixture of leucine and glucose caused a marked insulin response and altered the plasma amino acid profile in horses in a similar manner as described in man. However, the decreases seen in plasma amino acids in horses seem to be related more to an effect of leucine and not to the insulin response as seen in man.
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Affiliation(s)
- Katarina EA Nostell
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Box 7054, S-750 07 Uppsala, Sweden
| | - Birgitta Essén-Gustavsson
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Box 7054, S-750 07 Uppsala, Sweden
| | - Johan T Bröjer
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Box 7054, S-750 07 Uppsala, Sweden
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