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Branched-chain amino acids

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https://www.readbyqxmd.com/read/28915252/expression-and-regulation-of-the-neutral-amino-acid-transporter-b0at1-in-rat-small-intestine
#1
Julia Jando, Simone M R Camargo, Brigitte Herzog, François Verrey
Absorption of neutral amino acids across the luminal membrane of intestinal enterocytes is mediated by the broad neutral amino acid transporter B0AT1 (SLC6A19). Its intestinal expression depends on co-expression of the membrane-anchored peptidase angiotensin converting enzyme 2 (ACE2) and is additionally enhanced by aminopeptidase N (CD13). We investigated in this study the expression of B0AT1 and its auxiliary peptidases as well as its transport function along the rat small intestine. Additionally, we tested its possible short- and long-term regulation by dietary proteins and amino acids...
2017: PloS One
https://www.readbyqxmd.com/read/28905695/description-of-anaerotignum-aminivorans-gen-nov-sp-nov-a-strictly-anaerobic-amino-acid-decomposing-bacterium-isolated-from-a-methanogenic-reactor-and-reclassification-of-clostridium-propionicum-clostridium-neopropionicum-and-clostridium-lactatifermentans-as
#2
Atsuko Ueki, Kazushi Goto, Yoshimi Ohtaki, Nobuo Kaku, Katsuji Ueki
A strictly anaerobic bacterial strain (SH021T) was isolated from a methanogenic reactor. Cells were Gram-stain-positive, motile, straight or slightly curved rods. The optimum temperature for growth was 35 °C, and the optimum pH was 6.1-7.7. The strain was asaccharolytic and utilized amino acids as growth substrates. The strain produced acetate and propionate from l-alanine and l-serine, and propionate and butyrate from l-threonine. Branched-chain amino acids (l-isoleucine, l-leucine and l-valine) were utilized weakly, and isovalerate or isobutyrate was produced...
September 14, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28904371/acute-interaction-between-hydrocortisone-and-insulin-alters-the-plasma-metabolome-in-humans
#3
Mohammad A Alwashih, Roland H Stimson, Ruth Andrew, Brian R Walker, David G Watson
With the aim of identifying biomarkers of glucocorticoid action and their relationship with biomarkers of insulin action, metabolomic profiling was carried out in plasma samples from twenty healthy men who were administered either a low or medium dose insulin infusion (n = 10 each group). In addition, all subjects were given metyrapone (to inhibit adrenal cortisol secretion) + /- hydrocortisone (HC) in a randomised crossover design to produce low, medium and high glucocorticoid levels. The clearest effects of insulin were to reduce plasma levels of the branched chain amino acids (BCAs) leucine/isoleucine and their deaminated metabolites, and lowered free fatty acids and acylcarnitines...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899914/military-training-elicits-marked-increases-in-plasma-metabolomic-signatures-of-energy-metabolism-lipolysis-fatty-acid-oxidation-and-ketogenesis
#4
J Philip Karl, Lee M Margolis, Nancy E Murphy, Christopher T Carrigan, John W Castellani, Elisabeth H Madslien, Hilde-Kristin Teien, Svein Martini, Scott J Montain, Stefan M Pasiakos
Military training studies provide unique insight into metabolic responses to extreme physiologic stress induced by multiple stressor environments, and the impacts of nutrition in mediating these responses. Advances in metabolomics have provided new approaches for extending current understanding of factors modulating dynamic metabolic responses in these environments. In this study, whole-body metabolic responses to strenuous military training were explored in relation to energy balance and macronutrient intake by performing nontargeted global metabolite profiling on plasma collected from 25 male soldiers before and after completing a 4-day, 51-km cross-country ski march that produced high total daily energy expenditures (25...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28878358/enoyl-coa-hydratase-1-regulates-mtor-signaling-and-apoptosis-by-sensing-nutrients
#5
Ya-Kun Zhang, Yuan-Yuan Qu, Yan Lin, Xiao-Hui Wu, Hou-Zao Chen, Xu Wang, Kai-Qiang Zhou, Yun Wei, Fushen Guo, Cui-Fang Yao, Xia-Di He, Li-Xia Liu, Chen Yang, Zong-Yuan Guan, Shi-Dong Wang, Jianyuan Zhao, De-Pei Liu, Shi-Min Zhao, Wei Xu
The oncogenic mechanisms of overnutrition, a confirmed independent cancer risk factor, remain poorly understood. Herein, we report that enoyl-CoA hydratase-1 (ECHS1), the enzyme involved in the oxidation of fatty acids (FAs) and branched-chain amino acids (BCAAs), senses nutrients and promotes mTOR activation and apoptotic resistance. Nutrients-promoted acetylation of lys(101) of ECHS1 impedes ECHS1 activity by impairing enoyl-CoA binding, promoting ECHS1 degradation and blocking its mitochondrial translocation through inducing ubiquitination...
September 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28873647/influence-of-biopolymers-on-the-solubility-of-branched-chain-amino-acids-and-stability-of-their-solutions
#6
Chi Rac Hong, Gyu Whan Lee, Hyun-Dong Paik, Pahn-Shick Chang, Seung Jun Choi
This study confirmed the possibility of biopolymer-type stabilizers to increase the saturation concentration of branched-chain amino acids by preventing their crystallization/precipitation. Although microfluidization increased the initial solubility, it failed to increase the saturation concentration of the branched-chain amino acids. The saturation concentration of the branched-chain amino acids increased from 3.81% to 4.42% and 4.85% after the incorporation of food hydrocolloids and proteins, respectively...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28870476/branched-chain-amino-acid-supplementation-and-exercise-induced-muscle-damage-in-exercise-recovery-a%C3%A2-meta-analysis-of-randomized-clinical-trials
#7
REVIEW
Mohammad Hossein Rahimi, Sakineh Shab-Bidar, Mehdi Mollahosseini, Kurosh Djafarian
OBJECTIVE: Accumulating evidence suggests positive effects of branched-chain amino acids (BCAAs) on moderate muscle damage. However, findings vary substantially across studies. The aim of this review was to examine the effect of BCAAs on recovery following exercise-induced muscle damage. METHODS: Controlled trials were identified through a computerized literature search and tracking of citations performed up to November 2015. To pool data, either a fixed-effects or a random-effects model was used; for assessing heterogeneity, Cochran's Q and I(2) tests were used...
October 2017: Nutrition
https://www.readbyqxmd.com/read/28869183/complete-genome-sequence-of-pseudoalteromonas-espejiana-dsm9414-t-an-amino-acid-requiring-strain-from-seawater
#8
Jin-Cheng Rong, Qian-Qian Cha, Xue-Bing Ren, Bin-Bin Xie, Xiao-Yan Song
Strain DSM9414, the type strain of Pseudoalteromonas espejiana, is a Gram-negative, and amino-acid-requiring stain isolated from seawater off the coast of Northern California. In this study, we report the complete genome sequence of Pseudoalteromonas espejiana DSM9414(T). The genome (4,500,451bp; 40.3% G+C) is composed of two circular chromosomes: chromosome I is 3,720,756bp with 40.4% G+C content and chromosome II is 779,695bp with 39.8% G+C content. Genomic analysis showed that chromosome I encodes a complete set of ABC transporters responsible for branched-chain amino acids, whose homologous proteins were not discovered in other Pseudoalteromonas genomes released...
August 28, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28867816/dairy-product-consumption-interacts-with-glucokinase-gck-gene-polymorphisms-associated-with-insulin-resistance
#9
Marine S Da Silva, Dominic Chartrand, Marie-Claude Vohl, Olivier Barbier, Iwona Rudkowska
Dairy product intake and a person's genetic background have been reported to be associated with the risk of type 2 diabetes (T2D). The objective of this study was to examine the interaction between dairy products and genes related to T2D on glucose-insulin homeostasis parameters. A validated food frequency questionnaire, fasting blood samples, and glucokinase (GCK) genotypes were analyzed in 210 healthy participants. An interaction between rs1799884 in GCK and dairy intake on the homeostasis model assessment of insulin resistance was identified...
August 30, 2017: Journal of Personalized Medicine
https://www.readbyqxmd.com/read/28856713/leucine-supplementation-after-mechanical-stimulation-activates-protein-synthesis-via-l-type-amino-acid-transporter-1-in-vitro
#10
Naoya Nakai, Fuminori Kawano, Taro Murakami, Ken Nakata, Kazuhiko Higashida
Branched-chain amino acid supplements consumed following exercise are widely used to increase muscle mass. Although both exercise (i.e., mechanical stimulation) and branched-chain amino acid leucine supplementation have been reported to stimulate muscle protein synthesis by activating the mammalian target of rapamycin (mTOR) signaling pathway independently, the mechanisms underlying their synergistic effects are largely unknown. Utilizing cultured differentiated C2C12 myotubes, we established a combination treatment model in which the cells were subjected to cyclic uniaxial mechanical stretching (4 h, 15%, 1 Hz) followed by stimulation with 2 mM leucine for 45 min...
August 30, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28856439/plasma-amino-acids-adiposity-and-weight-change-after-gastric-bypass-surgery-are-amino-acids-associated-with-weight-regain
#11
Susanna E Hanvold, Kathrine J Vinknes, Nasser E Bastani, Cheryl Turner, Elin B Løken, Tom Mala, Helga Refsum, Anne-Marie Aas
PURPOSE: Plasma concentrations of several amino acids (AAs) are positively correlated with obesity. The aim of this study was to examine if selected plasma AAs are associated with weight regain from 2 to 4 years after Roux-en-Y gastric bypass (RYGB). METHODS: In a prospective study with 165 patients, we examined the relationship between plasma aromatic AAs (AAAs), branched chain AAs (BCAAs), and total cysteine (tCys) 2 years after RYGB, with BMI at 2 years and with weight change from 2 to 4 years after surgery...
August 30, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28854637/comparative-genomics-of-the-dual-obligate-symbionts-from-the-treehopper-entylia-carinata-hemiptera-membracidae-provide-insight-into-the-origins-and-evolution-of-an-ancient-symbiosis
#12
Meng Mao, Xiushuai Yang, Kirsten Poff, Gordon Bennett
Insect species in the Auchenorrhyncha suborder (Hemiptera) maintain ancient obligate symbioses with bacteria that provide essential amino acids (EAAs) deficient in their plant-sap diets. Molecular studies have revealed that two complementary symbiont lineages, "Candidatus Sulcia muelleri" and a betaproteobacterium ("Ca. Zinderia insecticola" in spittlebugs [Cercopoidea] and "Ca. Nasuia deltocephalinicola" in leafhoppers [Cicadellidae]) may have persisted in the suborder since its origin ∼300 Ma. However, investigation of how this pair has co-evolved on a genomic level is limited to only a few host lineages...
June 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28852372/branched-chain-amino-acids-and-muscle-protein-synthesis-in-humans-myth-or-reality
#13
REVIEW
Robert R Wolfe
The branched chain amino acids (BCAAs) are leucine, valine and isoleucine. A multi-million dollar industry of nutritional supplements has grown around the concept that dietary supplements of BCAAs alone produce an anabolic response in humans driven by a stimulation of muscle protein synthesis. In this brief review the theoretical and empirical bases for that claim are discussed. Theoretically, the maximal stimulation of muscle protein synthesis in the post-absorptive state in response to BCAAs alone is the difference between muscle protein breakdown and muscle protein synthesis (about 30% greater than synthesis), because the other EAAs required for synthesis of new protein can only be derived from muscle protein breakdown...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28851525/application-of-a-new-procedure-for-liquid-chromatography-mass-spectrometry-profiling-of-plasma-amino-acid-related-metabolites-and-untargeted-shotgun-proteomics-to-identify-mechanisms-and-biomarkers-of-calcific-aortic-stenosis
#14
Mariola Olkowicz, Janusz Debski, Patrycja Jablonska, Michal Dadlez, Ryszard T Smolenski
Calcific aortic valve stenosis (CAS) increasingly affects our ageing population, but the mechanisms of the disease and its biomarkers are not well established. Recently, plasma amino acid-related metabolite (AA) profiling has attracted attention in studies on pathology and development of biomarkers of cardiovascular diseases, but has not been studied in CAS. To evaluate the potential relationship between CAS and AA metabolome, a new ion-pairing reversed-phase liquid chromatography-tandem mass spectrometry (IP-RPLC-MS/MS) method has been developed and validated for simultaneous determination of 43 AAs in plasma of stenotic patients and age-matched control subjects...
September 29, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28844666/genetic-regulation-of-adipose-tissue-transcript-expression-is-involved-in-modulating-serum-triglyceride-and-hdl-cholesterol
#15
Satria P Sajuthi, Neeraj K Sharma, Mary E Comeau, Jeff W Chou, Donald W Bowden, Barry I Freedman, Carl D Langefeld, John S Parks, Swapan K Das
Dyslipidemia is a major contributor to the increased cardiovascular disease and mortality associated with obesity and type 2 diabetes. We hypothesized that variation in expression of adipose tissue transcripts is associated with serum lipid concentrations in African Americans (AAs), and common genetic variants regulate expression levels of these transcripts. Fasting serum lipid levels, genome-wide transcript expression profiles of subcutaneous adipose tissue, and genome-wide SNP genotypes were analyzed in a cohort of non-diabetic AAs (N=250)...
October 20, 2017: Gene
https://www.readbyqxmd.com/read/28842637/untargeted-metabolomic-analysis-in-naturally-occurring-canine-diabetes-mellitus-identifies-similarities-to-human-type-1-diabetes
#16
Allison L O'Kell, Timothy J Garrett, Clive Wasserfall, Mark A Atkinson
While predominant as a disease entity, knowledge voids exist regarding the pathogenesis of canine diabetes. To test the hypothesis that diabetic dogs have similar metabolomic perturbations to humans with type 1 diabetes (T1D), we analyzed serum metabolomic profiles of breed- and body weight-matched, diabetic (n = 6) and healthy (n = 6) dogs by liquid chromatography-mass spectrometry (LC-MS) profiling. We report distinct clustering of diabetic and control groups based on heat map analysis of known and unknown metabolites...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28839183/trans-omics-approaches-used-to-characterise-fish-nutritional-biorhythms-in-leopard-coral-grouper-plectropomus-leopardus
#17
Miyuki Mekuchi, Kenji Sakata, Tomofumi Yamaguchi, Masahiko Koiso, Jun Kikuchi
Aquaculture is now a major supplier of fish, and has the potential to be a major source of protein in the future. Leopard coral groupers are traded in Asian markets as superior fish, and production via aquaculture has commenced. As feeding efficiency is of great concern in aquaculture, we sought to examine the metabolism of leopard coral groupers using trans-omics approaches. Metabolic mechanisms were comprehensively analysed using transcriptomic and metabolomic techniques. This study focused on the dynamics of muscular metabolites and gene expression...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28830869/anesthesia-and-bariatric-surgery-gut-preparation-alter-plasma-acylcarnitines-reflective-of-mitochondrial-fat-and-branched-chain-amino-acid-oxidation
#18
Sudeepa Bhattacharyya, Mohamed Ali, William H Smith, Paul E Minkler, Maria S Stoll, Charles L Hoppel, Sean H Adams
The period around bariatric surgery offers a unique opportunity to characterize metabolism responses to dynamic shifts in energy, gut function, and anesthesia. We analyzed plasma acylcarnitines in obese women (n=17) sampled in the overnight fasted/postabsorptive state ca. 1-2 weeks prior to surgery (Condition A), the morning of surgery (prior restriction to a 48 hr. clear liquid diet coupled in some cases a standard polyethylene glycol gut evacuation: Condition B), and following induction of anesthesia (Condition C)...
August 22, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28815819/novel-consortium-of-klebsiella-variicola-and-lactobacillus-species-enhances-the-functional-potential-of-fermented-dairy-products-by-increasing-the-availability-of-branched-chain-amino-acids-and-the-amount-of-distinctive-volatiles
#19
H Rosales-Bravo, H C Morales-Torres, J Vázquez-Martínez, J Molina-Torres, V Olalde-Portugal, L P Partida-Martínez
AIMS: Identify novel bacterial taxa that could increase the availability of branched-chain amino acids and the amount of distinctive volatiles during skim milk fermentation. METHODS AND RESULTS: We recovered 344 bacterial isolates from stool samples of healthy and breastfed infants. Five were selected based on their ability to produce branched-chain amino acids. Three strains were identified as Escherichia coli, one as Klebsiella pneumoniae and other as Klebsiella variicola by molecular and biochemical methods...
August 17, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28813537/metabolite-patterns-predicting-sex-and-age-in-participants-of-the-karlsruhe-metabolomics-and-nutrition-karmen-study
#20
Manuela J Rist, Alexander Roth, Lara Frommherz, Christoph H Weinert, Ralf Krüger, Benedikt Merz, Diana Bunzel, Carina Mack, Björn Egert, Achim Bub, Benjamin Görling, Pavleta Tzvetkova, Burkhard Luy, Ingrid Hoffmann, Sabine E Kulling, Bernhard Watzl
Physiological and functional parameters, such as body composition, or physical fitness are known to differ between men and women and to change with age. The goal of this study was to investigate how sex and age-related physiological conditions are reflected in the metabolome of healthy humans and whether sex and age can be predicted based on the plasma and urine metabolite profiles. In the cross-sectional KarMeN (Karlsruhe Metabolomics and Nutrition) study 301 healthy men and women aged 18-80 years were recruited...
2017: PloS One
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