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Amino acid supplementation

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https://www.readbyqxmd.com/read/28934166/is-branched-chain-amino-acids-supplementation-an-efficient-nutritional-strategy-to-alleviate-skeletal-muscle-damage-a-systematic-review
#1
REVIEW
Alexandre Fouré, David Bendahan
Amino acids and more precisely, branched-chain amino acids (BCAAs), are usually consumed as nutritional supplements by many athletes and people involved in regular and moderate physical activities regardless of their practice level. BCAAs have been initially shown to increase muscle mass and have also been implicated in the limitation of structural and metabolic alterations associated with exercise damage. This systematic review provides a comprehensive analysis of the literature regarding the beneficial effects of BCAAs supplementation within the context of exercise-induced muscle damage or muscle injury...
September 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28932254/branched-chain-amino-acid-supplementation-restores-reduced-insulinotropic-activity-of-a-low-protein-diet-through-the-vagus-nerve-in-rats
#2
Mami Horiuchi, Tomoya Takeda, Hiroyuki Takanashi, Yori Ozaki-Masuzawa, Yusuke Taguchi, Yuka Toyoshima, Lila Otani, Hisanori Kato, Meri Sone-Yonezawa, Fumihiko Hakuno, Shin-Ichiro Takahashi, Asako Takenaka
BACKGROUND: Previously, we reported that a low-protein diet significantly reduced insulin secretion in response to feeding within 1 h in rats, suggesting that the insulinotropic effect of dietary protein plays an important role in maintaining normal insulin release. The current study aimed to elucidate whether deficiency of certain amino acids could diminish the insulinotropic activity and to investigate whether reduced insulin secretion in response to a low-protein diet is restored by supplementation with certain amino acids...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28929384/roles-of-dietary-glycine-proline-and-hydroxyproline-in-collagen-synthesis-and-animal-growth
#3
REVIEW
Peng Li, Guoyao Wu
Glycine, proline, and hydroxyproline (Hyp) contribute to 57% of total amino acids (AAs) in collagen, which accounts for one-third of proteins in animals. As the most abundant protein in the body, collagen is essential to maintain the normal structure and strength of connective tissue, such as bones, skin, cartilage, and blood vessels. Mammals, birds, and fish can synthesize: (1) glycine from threonine, serine, choline, and Hyp; (2) proline from arginine; and (3) Hyp from proline residues in collagen, in a cell- and tissue-specific manner...
September 20, 2017: Amino Acids
https://www.readbyqxmd.com/read/28929336/melatonin-alters-amino-acid-metabolism-and-inflammatory-responses-in-colitis-mice
#4
Gang Liu, Qian Jiang, Shuai Chen, Jun Fang, Wenkai Ren, Jie Yin, Kang Yao, Yulong Yin
Inflammatory bowel disease is a chronic inflammatory dysfunction of the gastrointestinal tract. This study explored the hypothesis that melatonin has beneficial functions in the mouse model of colitis induced by dextran sodium sulfate (DSS), with a specific focus on the expression of intestinal inflammatory cytokines and the serum levels of amino acids. The results revealed that mice with melatonin supplementation had a reduction in weight loss and disease index induced by DSS treatment. Melatonin stifled the expression of colonic IL-17 in mice with DSS-induced colitis...
September 19, 2017: Amino Acids
https://www.readbyqxmd.com/read/28923727/role-of-induced-glutathione-s-transferase-from-helicoverpa-armigera-lepidoptera-noctuidae-hagst-8-in-detoxification-of-pesticides
#5
Chaitali P Labade, Abhilash R Jadhav, Mehul Ahire, Smita S Zinjarde, Vaijayanti A Tamhane
The present study deals with glutathione-S-transferase (GST) based detoxification of pesticides in Helicoverpa armigera and its potential application in eliminating pesticides from the environment. Dietary exposure of a pesticide mixture (organophosphates - chlorpyrifos and dichlorvos, pyrethroid - cypermethrin; 2-15ppm each) to H. armigera larvae resulted in a dose dependant up-regulation of GST activity and gene expression. A variant GST from H. armigera (HaGST-8) was isolated from larvae fed with 10ppm pesticide mixture and it was recombinantly expressed in yeast (Pichia pastoris HaGST-8)...
September 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28923496/deficiency-of-the-mitochondrial-nad-kinase-causes-stress-induced-hepatic-steatosis-in-mice
#6
Kezhong Zhang, Hyunbae Kim, Zhiyao Fu, Yining Qiu, Zhao Yang, Jiemei Wang, Deqiang Zhang, Xin Tong, Lei Yin, Jing Li, Jianmei Wu, Nathan R Qi, Sander M Houten, Ren Zhang
BACKGROUND & AIMS: The mitochondrial nicotinamide adenine dinucleotide (NAD) kinase (NADK2, also called MNADK) catalyzes phosphorylation of NAD to yield NADP. Little is known about the functions of mitochondrial NADP and MNADK in liver physiology and pathology. We investigated the effects of reduced mitochondrial NADP by deleting MNADK in mice. METHODS: We generated MNADK-knockout (KO) mice on a C57BL/6NTac background; mice with a wild-type Mnadk gene were used as controls...
September 15, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28920930/gator1-regulates-nitrogenic-cataplerotic-reactions-of-the-mitochondrial-tca-cycle
#7
Jun Chen, Benjamin M Sutter, Lei Shi, Benjamin P Tu
The GATOR1 (SEACIT) complex consisting of Iml1-Npr2-Npr3 inhibits target of rapamycin complex 1 (TORC1) in response to amino acid insufficiency. In glucose medium, Saccharomyces cerevisiae mutants lacking the function of this complex grow poorly in the absence of amino acid supplementation, despite showing hallmarks of increased TORC1 signaling. Such mutants sense that they are amino acid replete and thus repress metabolic activities that are important for achieving this state. We found that npr2Δ mutants have defective mitochondrial tricarboxylic acid (TCA)-cycle activity and retrograde response...
September 18, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28919843/the-effects-of-phenylalanine-on-exercise-induced-fat-oxidation-a-preliminary-double-blind-placebo-controlled-crossover-trial
#8
Keisuke Ueda, Chiaki Sanbongi, Makoto Yamaguchi, Shuji Ikegami, Takafumi Hamaoka, Satoshi Fujita
BACKGROUND: When combined with exercise, dietary amino acid (AA) supplementation is an effective method for accelerating fat mobilization. However, the effects of single AAs combined with exercise on fat oxidation remains unclear. We hypothesized that consumption of a specific amino acid, L- phenylalanine, may result in the secretion of glucagon, and when combined with exercise may promote fat oxidation. METHODS: Six healthy, active male volunteers were randomized in a crossover study to ingest either phenylalanine (3 g/dose) or placebo...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28919842/international-society-of-sports-nutrition-position-stand-nutrient-timing
#9
REVIEW
Chad M Kerksick, Shawn Arent, Brad J Schoenfeld, Jeffrey R Stout, Bill Campbell, Colin D Wilborn, Lem Taylor, Doug Kalman, Abbie E Smith-Ryan, Richard B Kreider, Darryn Willoughby, Paul J Arciero, Trisha A VanDusseldorp, Michael J Ormsbee, Robert Wildman, Mike Greenwood, Tim N Ziegenfuss, Alan A Aragon, Jose Antonio
The International Society of Sports Nutrition (ISSN) provides an objective and critical review regarding the timing of macronutrients in reference to healthy, exercising adults and in particular highly trained individuals on exercise performance and body composition. The following points summarize the position of the ISSN:Nutrient timing incorporates the use of methodical planning and eating of whole foods, fortified foods and dietary supplements. The timing of energy intake and the ratio of certain ingested macronutrients may enhance recovery and tissue repair, augment muscle protein synthesis (MPS), and improve mood states following high-volume or intense exercise...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28916119/safety-and-efficacy-of-glycerol-phenylbutyrate-for-management-of-urea-cycle-disorders-in-patients-aged-2months-to-2years
#10
Susan A Berry, Nicola Longo, George A Diaz, Shawn E McCandless, Wendy E Smith, Cary O Harding, Roberto Zori, Can Ficicioglu, Uta Lichter-Konecki, Beth Robinson, Jerry Vockley
INTRODUCTION: Glycerol phenylbutyrate (GPB) is approved in the US for the management of patients 2months of age and older with urea cycle disorders (UCDs) that cannot be managed with protein restriction and/or amino acid supplementation alone. Limited data exist on the use of nitrogen conjugation agents in very young patients. METHODS: Seventeen patients (15 previously on other nitrogen scavengers) with all types of UCDs aged 2months to 2years were switched to, or started, GPB...
September 8, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28915252/expression-and-regulation-of-the-neutral-amino-acid-transporter-b0at1-in-rat-small-intestine
#11
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/28914062/-separation-of-phenylalanine-and-methionine-enantiomers-by-hplc-method-a%C3%A2-comparison-of-stationary-phase-types
#12
Katarína Hroboňová, Anna Lomenova, Jozef Čižmárik, Jozef Lehotay
The paper deals with enantioselective separation of amino acids by the high performance liquid chromatography method. Separations of enantiomeric forms were tested on the chiral stationary phases based on β-cyclodextrine, isopropyl carbamate cyclofructan 6, and the macrocyclic antibiotic teicoplanin. The best enantioseparation was obtained on the teicoplanin-based chiral stationary phase in the reversed-phase mode. UV spectrophotometric detection at 210 nm was used for detection of amino acids. The method was validated with respect to linearity, precision, limit of detection, limit of quantitation, and recovery...
2017: Ceská a Slovenská Farmacie
https://www.readbyqxmd.com/read/28912077/electron-receptor-addition-enhances-butanol-synthesis-in-abe-fermentation-by-clostridium-acetobutylicum
#13
Jian Ding, Hongzhen Luo, Fang Xie, Hao Wang, Meng Xu, Zhongping Shi
The techniques for enhancing butanol production in ABE fermentation by Clostridium acetobutylicum generally focus on adding electron carrier to strengthen NADH synthesis, repressing hydrogenase by aerating CO, supplementing butyrate, etc. However, those methods suffer from the problems of total solvent decrease, high purification cost, using expensive supplemental substances, etc. In this study, we added small amount of electron receptors (Na2SO4/CaSO4, 2g/L) into ABE fermentation broth: to alter electron/proton distributions in the intracellular electron transport shuttle system, directing more electron/proton pairs into NADH synthesis route; to stimulate intracellular accumulation of those amino acids favorable for cells survival/butanol synthesis...
September 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28911262/alleviation-by-gamma-amino-butyric-acid-supplementation-of-chronic-heat-stress-induced-degenerative-changes-in-jejunum-in-commercial-broiler-chickens
#14
Rasha A Al Wakeel, Mustafa Shukry, Ahmed Abdel Azeez, Shawky Mahmoud, Michel Fahmy Saad
High ambient temperature adversely influences poultry production. In the present study, gamma amino butyric acid (GABA) supplementation was used to alleviate the adverse changes due to heat stress (HS) in a broiler chicken strain (Ross 308). At 21 days of age, the birds were divided into four groups of 13. Two groups were housed under normal room temperature, one group was given orally 0.2 ml 0.9% physiological saline (CN) daily, the other group received 0.2 ml of 0.5% GABA solution orally (GN). A third group was exposed to environmental HS (33 ± 1 °C lasting for 2 weeks) + physiological saline (CH) and a fourth group was exposed to HS + GABA supplementation (GH)...
September 15, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28911008/maternal-dietary-l-arginine-and-adverse-birth-outcomes-in-dar-es-salaam-tanzania
#15
Anne Marie Darling, Chloe R McDonald, Willy S Urassa, Kevin C Kain, Ramadhani S Mwiru, Wafaie W Fawzi
The amino acid arginine is a physiological precursor to nitric oxide, which is a key mediator of embryonic survival, fetal growth, and pregnancy maintenance. We evaluated the association between consumption of the amino acid arginine and the rate of adverse birth outcomes using data from a double-blind, randomized, placebo-controlled micronutrient supplementation trial among pregnant women in Dar es Salaam, Tanzania (2001-2004). Dietary intakes of arginine were assessed using repeated 24-hour recalls that were administered throughout pregnancy...
September 1, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28910200/comparison-of-two-%C3%AE-alanine-dosing-protocols-on-muscle-carnosine-elevations
#16
David D Church, Jay R Hoffman, Alyssa N Varanoske, Ran Wang, Kayla M Baker, Michael B La Monica, Kyle S Beyer, Sarah J Dodd, Leonardo P Oliveira, Roger C Harris, David H Fukuda, Jeffrey R Stout
OBJECTIVE: β-alanine (BA) is a nonproteogenic amino acid that combines with histidine to form carnosine. The amount taken orally in individual doses, however, is limited due to symptoms of paresthesia that are associated with higher doses. The use of a sustained-release formulation has been reported to reduce the symptoms of paresthesia, suggesting that a greater daily dose may be possible. The purpose of the present study was to determine whether increasing the daily dose of BA can result in a similar increase in muscle carnosine in a reduced time...
September 14, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28904640/short-term-dietary-methionine-supplementation-affects-one-carbon-metabolism-and-dna-methylation-in-the-mouse-gut-and-leads-to-altered-microbiome-profiles-barrier-function-gene-expression-and-histomorphology
#17
Isabelle R Miousse, Rupak Pathak, Sarita Garg, Charles M Skinner, Stepan Melnyk, Oleksandra Pavliv, Howard Hendrickson, Reid D Landes, Annie Lumen, Alan J Tackett, Nicolaas E P Deutz, Martin Hauer-Jensen, Igor Koturbash
BACKGROUND: Methionine, a central molecule in one-carbon metabolism, is an essential amino acid required for normal growth and development. Despite its importance to biological systems, methionine is toxic when administered at supra-physiological levels. The aim of this study was to investigate the effects of short-term methionine dietary modulation on the proximal jejunum, the section of the gut specifically responsible for amino acid absorption, in a mouse model. Eight-week-old CBA/J male mice were fed methionine-adequate (MAD; 6...
2017: Genes & Nutrition
https://www.readbyqxmd.com/read/28904419/fish-scales-as-potential-substrate-for-production-of-alkaline-protease-and-amino-acid-rich-aqua-hydrolyzate-by-bacillus-altitudinis-gvc11
#18
N Harikrishna, S Mahalakshmi, K Kiran Kumar, Gopal Reddy
Fish processing industries generate large quantities of fish scales as processing waste, if not treated leading to environmental pollution. Fish scales are hard to degrade, hence cause difficulty in waste management. In this context present study was made to utilize fish scales as substrate for the production of alkaline protease by Bacillus altitudinis GVC11 and subsequently amino acid rich aqua hydrolyzate. B. altitudinis GVC11 efficiently utilized five types of fish scales as substrates and produced maximum alkaline protease using Labeo rohita (28,150 U/mL) followed by Catla catla (23,320 U/mL) at 48 h and Cyprinus carpio (17,146 U/mL) Mugil cephalus (18,917 U/mL), Cirrhinus mrigala (12,430 U/mL) at 72 h...
September 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28903954/quantity-and-source-of-dietary-protein-influence-metabolite-production-by-gut-microbiota-and-rectal-mucosa-gene-expression-a-randomized-parallel-double-blind-trial-in-overweight-humans
#19
Martin Beaumont, Kevin Joseph Portune, Nils Steuer, Annaïg Lan, Victor Cerrudo, Marc Audebert, Florent Dumont, Giulia Mancano, Nadezda Khodorova, Mireille Andriamihaja, Gheorghe Airinei, Daniel Tomé, Robert Benamouzig, Anne-Marie Davila, Sandrine Paule Claus, Yolanda Sanz, François Blachier
Background: Although high-protein diets (HPDs) are frequently consumed for body-weight control, little is known about the consequences for gut microbiota composition and metabolic activity and for large intestine mucosal homeostasis. Moreover, the effects of HPDs according to the source of protein need to be considered in this context.Objective: The objective of this study was to evaluate the effects of the quantity and source of dietary protein on microbiota composition, bacterial metabolite production, and consequences for the large intestinal mucosa in humans...
September 13, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28900203/metabolic-engineering-for-recombinant-major-ampullate-spidroin-2-masp2-synthesis-in-escherichia-coli
#20
Hao Cao, Shafaq Parveen, Ding Ding, Haijun Xu, Tianwei Tan, Luo Liu
In this research, metabolic engineering was employed to synthesize the artificial major ampullate spidroin 2 (MaSp2) in the engineered Escherichia coli. An iterative seamless splicing strategy was used to assemble the MaSp2 gene, which could reach 10000 base pairs, and more than 100 kDa protein was expected. However, only 55 kDa recombinant MaSp2 was obtained. Because MaSp2 is rich in alanine and glycine residues, Glycyl/alanyl-tRNA pool and extra amino acids adding were adopted in order to supplement alanine and glycine in the protein translation process...
September 12, 2017: Scientific Reports
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