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Branched-chain amino acids

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https://www.readbyqxmd.com/read/27900834/transformation-of-free-and-dipeptide-bound-glycated-amino-acids-by-two-strains-of-saccharomyces-cerevisiae
#1
Michael Hellwig, Marie Börner, Falco Beer, Karl-Heinz van Pée, Thomas Henle
The yeast Saccharomyces cerevisiae transforms branched-chain and aromatic amino acids to higher alcohols in the Ehrlich pathway. During microbiological culturing and industrial fermentations, this yeast is confronted with amino acids modified by reducing sugars in the Maillard reaction (glycation). In order to get first insights into the physiological "handling" of glycated amino acids by yeasts, individual Maillard reaction products (MRPs; fructosyllysine, carboxymethyllysine, pyrraline, formyline, maltosine, methylglyoxal-derived hydroimidazolone) were administered to two strains of S...
November 30, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27898682/genetic-predisposition-to-an-impaired-metabolism-of-the-branched-chain-amino-acids-and-risk-of-type-2-diabetes-a-mendelian-randomisation-analysis
#2
Luca A Lotta, Robert A Scott, Stephen J Sharp, Stephen Burgess, Jian'an Luan, Therese Tillin, Amand F Schmidt, Fumiaki Imamura, Isobel D Stewart, John R B Perry, Luke Marney, Albert Koulman, Edward D Karoly, Nita G Forouhi, Rasmus J O Sjögren, Erik Näslund, Juleen R Zierath, Anna Krook, David B Savage, Julian L Griffin, Nishi Chaturvedi, Aroon D Hingorani, Kay-Tee Khaw, Inês Barroso, Mark I McCarthy, Stephen O'Rahilly, Nicholas J Wareham, Claudia Langenberg
BACKGROUND: Higher circulating levels of the branched-chain amino acids (BCAAs; i.e., isoleucine, leucine, and valine) are strongly associated with higher type 2 diabetes risk, but it is not known whether this association is causal. We undertook large-scale human genetic analyses to address this question. METHODS AND FINDINGS: Genome-wide studies of BCAA levels in 16,596 individuals revealed five genomic regions associated at genome-wide levels of significance (p < 5 × 10-8)...
November 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27895003/effect-on-nitrogen-balance-thermogenesis-body-composition-satiety-and-circulating-branched-chain-amino-acid-levels-up-to-one-year-after-surgery-protocol-of-a-randomized-controlled-trial-on-dietary-protein-during-surgical-weight-loss
#3
Violeta Moizé, Xavier Pi-Sunyer, Josep Vidal, Patricia Miner, Yves Boirie, Blandine Laferrère
BACKGROUND: Bariatric surgery (BS), the most effective treatment for severe obesity, typically results in 40-50 kg weight loss in the year following the surgery. Beyond its action on protein metabolism, dietary protein intake (PI) affects satiety, thermogenesis, energy efficiency, and body composition (BC). However, the required amount of PI after surgical weight loss is not known. The current daily PI recommendation for diet-induced weight loss is 0.8 g/kg ideal body weight (IBW) per day, but whether this amount is sufficient to preserve fat-free mass during active surgical weight loss is unknown...
November 28, 2016: JMIR Research Protocols
https://www.readbyqxmd.com/read/27891833/metabolomics-guided-insights-on-bariatric-surgery-versus-behavioral-interventions-for-weight-loss
#4
REVIEW
Sara Tulipani, Jules Griffin, Magali Palau-Rodriguez, Ximena Mora-Cubillos, Rosa M Bernal-Lopez, Francisco J Tinahones, Barbara E Corkey, Cristina Andres-Lacueva
OBJECTIVE: To review the metabolomic studies carried out so far to identify metabolic markers associated with surgical and dietary treatments for weight loss in subjects with obesity. METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. RESULTS: Thirty-two studies successfully met the eligibility criteria. The metabolic adaptations shared by surgical and dietary interventions mirrored a state of starvation ketoacidosis (increase of circulating ketone bodies), an increase of acylcarnitines and fatty acid β-oxidation, a decrease of specific amino acids including branched-chain amino acids (BCAA) and (lyso)glycerophospholipids previously associated with obesity, and adipose tissue expansion...
December 2016: Obesity
https://www.readbyqxmd.com/read/27890800/metabolic-responses-of-haliotis-diversicolor-to-vibrio-parahaemolyticus-infection
#5
Jie Lu, Yanyan Shi, Shuhui Cai, Jianghua Feng
Vibrio parahemolyticus is a devastating bacterial pathogen that often causes outbreak of vibriosis in abalone Haliotis diversicolor. Elucidation of metabolic mechanisms of abalones in responding to V. parahemolyticus infection is essential for controlling the epidemic. In this work, (1)H NMR-based metabolomic techniques along with correlation and network analyses are used to investigate characteristic metabolites, as well as corresponding disturbed pathways in hepatopancreas and gill of H. diversicolor after V...
November 24, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27886623/liver-bcatm-transgenic-mouse-model-reveals-the-important-role-of-the-liver-in-maintaining-bcaa-homeostasis
#6
Elitsa A Ananieva, Cynthia G Van Horn, Meghan R Jones, Susan M Hutson
Unlike other amino acids, the branched-chain amino acids (BCAAs) largely bypass first-pass liver degradation due to a lack of hepatocyte expression of the mitochondrial branched-chain aminotransferase (BCATm). This sets up interorgan shuttling of BCAAs and liver-skeletal muscle cooperation in BCAA catabolism. To explore whether complete liver catabolism of BCAAs may impact BCAA shuttling in peripheral tissues, the BCATm gene was stably introduced into mouse liver. Two transgenic mouse lines with low and high hepatocyte expression of the BCATm transgene (LivTg-LE and LivTg-HE) were created and used to measure liver and plasma amino acid concentrations and determine whether the first two BCAA enzymatic steps in liver, skeletal muscle, heart and kidney were impacted...
November 2, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/27885628/bcaa-metabolism-and-nh3-homeostasis
#7
M E Conway, S M Hutson
The branched chain amino acids (BCAA) are essential amino acids required not only for growth and development, but also as nutrient signals and as nitrogen donors to neurotransmitter synthesis and glutamate/glutamine cycling. Transamination and oxidative decarboxylation of the BCAAs are catalysed by the branched-chain aminotransferase proteins (BCATm, mitochondrial and BCATc, cytosolic) and the branched-chain α-keto acid dehydrogenase enzyme complex (BCKDC), respectively. These proteins show tissue, cell compartmentation, and protein-protein interactions, which call for substrate shuttling or channelling and nitrogen transfer for oxidation to occur...
2016: Advances in Neurobiology
https://www.readbyqxmd.com/read/27883272/circulating-adipocyte-derived-exosomal-micrornas-associated-with-decreased-insulin-resistance-after-gastric-bypass
#8
Monica J Hubal, Evan P Nadler, Sarah C Ferrante, Matthew D Barberio, Jung-Hyuk Suh, Justin Wang, G Lynis Dohm, Walter J Pories, Michelle Mietus-Snyder, Robert J Freishtat
OBJECTIVE: Exosomes from obese adipose contain dysregulated microRNAs linked to insulin signaling, as compared with lean controls, providing a direct connection between adiposity and insulin resistance. This study tested the hypotheses that gastric bypass surgery and its subsequent weight loss would normalize adipocyte-derived exosomal microRNAs associated with insulin signaling and the associated metabolome related to glucose homeostasis. METHODS: African American female subjects with obesity (N = 6; age: 38...
November 24, 2016: Obesity
https://www.readbyqxmd.com/read/27881392/higher-serum-phenylalanine-concentration-is-associated-with-more-rapid-telomere-shortening-in-men
#9
Johan G Eriksson, Maria-Angela Guzzardi, Patricia Iozzo, Eero Kajantie, Hannu Kautiainen, Minna K Salonen
BACKGROUND: Telomere length and telomere shortening are associated with age-related health outcomes. Only a few studies have been able to longitudinally report on factors that are associated with changes in telomere length in an aging population. OBJECTIVE: We studied the longitudinal relation between telomere length, the change in telomere length, and circulating amino acids. DESIGN: A total of 812 subjects from the Helsinki Birth Cohort Study (born from 1934 to 1944), who underwent 3 clinical visits during a 10-y interval that included measurements of cardiometabolic risk factors, were included in the study...
November 23, 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27873095/oral-branched-chain-amino-acid-granules-improve-structure-and-function-of-human-serum-albumin-in-cirrhotic-patients
#10
Hiroko Setoyama, Motohiko Tanaka, Kohei Nagumo, Hideaki Naoe, Takehisa Watanabe, Youko Yoshimaru, Masakuni Tateyama, Masato Sasaki, Hiroshi Watanabe, Masaki Otagiri, Toru Maruyama, Yutaka Sasaki
BACKGROUND AND AIMS: The aim of this study was to evaluate structural and functional alterations of human serum albumin (HSA), with a special focus on the oxidized and reduced forms, in patients with chronic liver disease. We also investigated whether oral branched-chain amino acid (BCAA) supplementation could induce structural changes and improve the functions of HSA. METHODS: The proportion of reduced and oxidized HSA was determined in 16 healthy controls and in 20 chronic hepatitis and 100 cirrhotic patients with stable conditions...
November 21, 2016: Journal of Gastroenterology
https://www.readbyqxmd.com/read/27872968/new-functions-and-potential-applications-of-amino-acids
#11
Hisayuki Uneyama, Hisamine Kobayashi, Naoto Tonouchi
Currently, several types of amino acids are being produced and used worldwide. Nevertheless, several new functions of amino acids have been recently discovered that could result in other applications. For example, oral stimulation by glutamate triggers the cephalic phase response to prepare for food digestion. Further, the stomach and intestines have specific glutamate-recognizing systems in their epithelial mucosa. Regarding clinical applications, addition of monosodium glutamate to the medicinal diet has been shown to markedly enhance gastric secretion in a vagus-dependent manner...
November 22, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27872960/branched-chain-amino-acids
#12
Keisuke Yamamoto, Atsunari Tsuchisaka, Hideaki Yukawa
Branched-chain amino acids (BCAAs), viz., L-isoleucine, L-leucine, and L-valine, are essential amino acids that cannot be synthesized in higher organisms and are important nutrition for humans as well as livestock. They are also valued as synthetic intermediates for pharmaceuticals. Therefore, the demand for BCAAs in the feed and pharmaceutical industries is increasing continuously. Traditional industrial fermentative production of BCAAs was performed using microorganisms isolated by random mutagenesis. A collection of these classical strains was also scientifically useful to clarify the details of the BCAA biosynthetic pathways, which are tightly regulated by feedback inhibition and transcriptional attenuation...
November 22, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27872244/network-guided-gwas-improves-identification-of-genes-affecting-free-amino-acids
#13
Ruthie Angelovici, Albert Batushansky, Nicholas Deason, Sabrina Gonzalez-Jorge, Michael A Gore, Aaron Fait, Dean DellaPenna
Amino acids (AA) are essential for proper growth and development in plants. AAs serve as building blocks for proteins but also are important for responses to stresses and the biosynthesis of numerous essential compounds. In seed, the pool of free amino acids (FAA) also contributes to alternative energy, desiccation, and seed vigor; thus, manipulating FAA levels can significantly impact a seed's nutritional qualities. While genome-wide association studies (GWAS) on branched chain amino acids have identified some regulatory genes controlling seed FAAs, the genetic regulation of FAA levels, composition, and homeostasis in seeds remains mostly unresolved...
November 21, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27871372/a-novel-highly-thermostable-branched-chain-amino-acid-aminotransferase-from-the-crenarchaeon-vulcanisaeta-moutnovskia
#14
Tatiana N Stekhanova, Andrey L Rakitin, Andrey V Mardanov, Ekaterina Yu Bezsudnova, Vladimir O Popov
A new fold-type IV branched-chain amino acid aminotransferase VMUT0738 from the hyperthermophilic Crenarchaeon Vulcanisaeta moutnovskia was successfully expressed in Escherichia coli. Purified VMUT0738 showed activity toward numerous aliphatic and aromatic l-amino acids and 2-oxo acids at optimal pH 8.0. Distinguishing features of the VMUT0738 compared with typical BCAT are the absence of activity toward acidic substrates, high activity toward basic ones, and low but detectable activity toward the (R)-enantiomer of α-methylbenzylamine (0...
January 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27843095/branched-chain-amino-acids-cause-liver-injury-in-obese-diabetic-mice-by-promoting-adipocyte-lipolysis-and-inhibiting-hepatic-autophagy
#15
Fuyang Zhang, Shihao Zhao, Wenjun Yan, Yunlong Xia, Xiyao Chen, Wei Wang, Jinglong Zhang, Chao Gao, Cheng Peng, Feng Yan, Huishou Zhao, Kun Lian, Yan Lee, Ling Zhang, Wayne Bond Lau, Xinliang Ma, Ling Tao
The Western meat-rich diet is both high in protein and fat. Although the hazardous effect of a high fat diet (HFD) upon liver structure and function is well recognized, whether the co-presence of high protein intake contributes to, or protects against, HF-induced hepatic injury remains unclear. Increased intake of branched chain amino acids (BCAA, essential amino acids compromising 20% of total protein intake) reduces body weight. However, elevated circulating BCAA is associated with non-alcoholic fatty liver disease and injury...
October 11, 2016: EBioMedicine
https://www.readbyqxmd.com/read/27832938/keto-acid-metabolites-of-branched-chain-amino-acids-inhibit-oxidative-stress-induced-necrosis-and-attenuate-myocardial-ischemia-reperfusion-injury
#16
Weibing Dong, Meiyi Zhou, Mei Dong, Bangfen Pan, Yunxia Liu, Jing Shao, Xiaoping Gu, Ying Huang, Guangping Li, Yibin Wang, Haipeng Sun
Branched chain α-keto acids (BCKAs) are endogenous metabolites of branched-chain amino acids (BCAAs). BCAA and BCKA are significantly elevated in pathologically stressed heart and contribute to chronic pathological remodeling and dysfunction. However, their direct impact on acute cardiac injury is unknown. Here, we demonstrated that elevated BCKAs significantly attenuated ischemia-reperfusion (I/R) injury and preserved post I/R function in isolated mouse hearts. BCKAs protected cardiomyocytes from oxidative stress-induced cell death in vitro...
November 8, 2016: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/27829829/the-pretransplant-systemic-metabolic-profile-reflects-a-risk-of-acute-graft-versus-host-disease-after-allogeneic-stem-cell-transplantation
#17
Håkon Reikvam, Kimberley Hatfield, Øystein Bruserud
Allogeneic stem cell transplantation is used in the treatment of younger patients with severe hematological diseases, especially hematological malignancies, and acute graft versus host disease (GVHD) is then an important immune-mediated posttransplant complication. Several risk factors for acute GVHD have been identified, including pretransplant factors that possibly influence the posttranspant course through their effects on host immunocompetent cells. Metabolic regulation is important for immunoregulation, and we therefore investigated whether the pretransplant metabolic status of allotransplant recipients was associated with later acute GVHD...
2016: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/27821715/a-novel-diet-induced-murine-model-of-steatohepatitis-with-fibrosis-for-screening-and-evaluation-of-drug-candidates-for-nonalcoholic-steatohepatitis
#18
Chieko Ejima, Haruna Kuroda, Sonoko Ishizaki
Many animal models of nonalcoholic steatohepatitis have been reported. While these models exhibit mild onset of hepatitis and fibrosis, induction is often slow. For faster screening of drug candidates, there is a compelling need for convenient animal models of steatohepatitis and nonalcoholic steatohepatitis in which fatty liver and hepatitis are stably induced within a short period. Here, we analyzed the hepatic lipid composition in nonalcoholic steatohepatitis, and used this information to successfully establish a murine model where steatohepatitis is induced within only 1 week using a novel diet (steatohepatitis-inducing high-fat diet, STHD-01) high in saturated fatty acids and cholesterol...
November 2016: Physiological Reports
https://www.readbyqxmd.com/read/27816452/deletion-of-the-transcriptional-coactivator-pgc1%C3%AE-in-skeletal-muscles-is-associated-with-reduced-expression-of-genes-related-to-oxidative-muscle-function
#19
Yukino Hatazawa, Kimiko Minami, Ryoji Yoshimura, Takumi Onishi, Mark Christian Manio, Kazuo Inoue, Naoki Sawada, Osamu Suzuki, Shinji Miura, Yasutomi Kamei
The expression of the transcriptional coactivator PGC1α is increased in skeletal muscles during exercise. Previously, we showed that increased PGC1α leads to prolonged exercise performance (the duration for which running can be continued) and, at the same time, increases the expression of branched-chain amino acid (BCAA) metabolism-related enzymes and genes that are involved in supplying substrates for the TCA cycle. We recently created mice with PGC1α knockout specifically in the skeletal muscles (PGC1α KO mice), which show decreased mitochondrial content...
December 9, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27814705/maternal-urinary-metabolic-signatures-of-fetal-growth-and-associated-clinical-and-environmental-factors-in-the-inma-study
#20
Léa Maitre, Cristina M Villanueva, Matthew R Lewis, Jesús Ibarluzea, Loreto Santa-Marina, Martine Vrijheid, Jordi Sunyer, Muireann Coen, Mireille B Toledano
BACKGROUND: Maternal metabolism during pregnancy is a major determinant of the intra-uterine environment and fetal outcomes. Herein, we characterize the maternal urinary metabolome throughout pregnancy to identify maternal metabolic signatures of fetal growth in two subcohorts and explain potential sources of variation in metabolic profiles based on lifestyle and clinical data. METHODS: We used (1)H nuclear magnetic resonance (NMR) spectroscopy to characterize maternal urine samples collected in the INMA birth cohort at the first (n = 412 and n = 394, respectively, in Gipuzkoa and Sabadell cohorts) and third trimesters of gestation (n = 417 and 469)...
November 4, 2016: BMC Medicine
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