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Glutamine supplementation

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https://www.readbyqxmd.com/read/28924963/combining-metabolic-and-process-engineering-strategies-to-improve-recombinant-glycoprotein-production-and-quality
#1
Eric Karengera, Yves Durocher, Gregory De Crescenzo, Olivier Henry
Increasing recombinant protein production while ensuring a high and consistent protein quality remains a challenge in mammalian cell culture process development. In this work, we combined a nutrient substitution approach with a metabolic engineering strategy that improves glucose utilization efficiency. This combination allowed us to tackle both lactate and ammonia accumulation and investigate on potential synergistic effects on protein production and quality. To this end, HEK293 cells overexpressing the pyruvate yeast carboxylase (PYC2) and their parental cells, both stably producing the therapeutic glycoprotein interferon α2b (IFNα2b), were cultured in media deprived of glutamine but containing chosen substitutes...
September 18, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28920930/gator1-regulates-nitrogenic-cataplerotic-reactions-of-the-mitochondrial-tca-cycle
#2
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/28918494/betaine-in-the-brain-characterization-of-betaine-uptake-its-influence-on-other-osmolytes-and-its-potential-role-in-neuroprotection-from-osmotic-stress
#3
Leena S Knight, Quinn Piibe, Ian Lambie, Christopher Perkins, Paul H Yancey
Betaine (N-trimethylglycine), a common osmolyte, has received attention because of the number of clinical reports associating betaine supplementation with improved cognition, neuroprotection and exercise physiology. However, tissue analyses report little accumulation of betaine in brain tissue despite the presence of betaine/GABA transporters (BGT1) at the blood brain barrier and in nervous tissue, calling into question whether betaine influences neuronal function directly or indirectly. Therefore, the focus of this study was to determine what capacity nervous tissue has to accumulate betaine, specifically in the hippocampus, a region of the brain associated with learning and memory and one that is particularly susceptible to damage (e...
September 16, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28916119/safety-and-efficacy-of-glycerol-phenylbutyrate-for-management-of-urea-cycle-disorders-in-patients-aged-2months-to-2years
#4
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/28915388/epa-and-dha-but-not-ala-have-antidepressant-effects-with-17%C3%AE-estradiol-injection-via-regulation-of-a-neurobiological-system-in-ovariectomized-rats
#5
Jeong-Eun Choi, Yongsoon Park
Our previous studies found that n-3 polyunsaturated fatty acids (PUFAs) and estrogen had synergistic antidepressant-like effects. The purpose of the present study was to investigate the hypothesis that three major n-3 PUFAs, α-linolenic acid (ALA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), individually had antidepressant effects combined with 17β-estradiol-3-benzoate (E) through a neurobiological pathway in ovariectomized rats. Rats were fed a modified American Institute of Nutrition-93G diet with 0% n-3 PUFAs and 1% ALA, EPA and DHA relative to total energy intake for 12 weeks and were injected with corn oil or E every 4 days during the last 3 weeks...
August 5, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28912361/impact-of-sleep-restriction-on-local-immune-response-and-skin-barrier-restoration-with-and-without-multi-nutrient-nutrition-intervention
#6
Tracey J Smith, Marques A Wilson, J Philip Karl, Jeb Orr, Carl D Smith, Adam D Cooper, Kristin J Heaton, Andrew J Young, Scott J Montain
Systemic immune function is impaired by sleep restriction. However, the impact of sleep restriction on local immune responses, and to what extent any impairment can be mitigated by nutritional supplementation is unknown. We assessed the effect of 72-h sleep restriction (2-h nightly sleep) on local immune function and skin barrier restoration of an experimental wound, and determined the influence of habitual protein intake (1.5 g·kg(-1)·d(-1)) supplemented with arginine, glutamine, zinc sulfate, vitamin C, vitamin D3 and omega-3 fatty acids compared to lower protein intake (0...
September 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28882796/protective-effect-of-glutamine-and-arginine-against-soybean-meal-induced-enteritis-in-the-juvenile-turbot-scophthalmus-maximus
#7
Min Gu, Nan Bai, Bingying Xu, Xiaojie Xu, Qian Jia, Zhiyu Zhang
Soybean meal can induce enteritis in the distal intestine (DI) and decrease the immunity of several cultured fish species, including turbot Scophthalmus maximus. Glutamine and arginine supplementation have been used to improve immunity and intestinal morphology in fish. This study was conducted to investigate the effects of these two amino acids on the immunity and intestinal health of turbot suffering from soybean meal-induced enteritis. Turbots (initial weight 7.6 g) were fed one of three isonitrogenous and isolipidic diets for 8 weeks: SBM (control diet), with 40% soybean meal; GLN, SBM diet plus 1...
September 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28870483/influence-of-an-%C3%AF-3-fatty-acid-enriched-enteral-diet-with-and-without-added-glutamine-on-the-metabolic-response-to-injury-in-a-rat-model-of-prolonged-acute-catabolism
#8
Gabrielle Ventura, Murielle Bortolotti, Nathalie Neveux, Xavier Gusmini, Samir Nakib, Gilles Sarfati, Luc Cynober, Jean-Pascal De Bandt
OBJECTIVE: In critically ill patients, acute injury alters gut function, causing greater risk for sepsis and malnutrition. Peptide-enriched diets may promote nitrogen absorption, whereas ω3-enriched diets reduce alterations in gut barrier function. The aim of this study was to assess the effectiveness of a peptide- and ω3-enriched diet on the metabolic response to injury and the gut barrier function in a model of prolonged catabolism in the rat. Given the intestinal trophic effect of glutamine, we tested for a synergistic effect of glutamine...
October 2017: Nutrition
https://www.readbyqxmd.com/read/28835610/glutamine-metabolism-regulates-autophagy-dependent-mtorc1-reactivation-during-amino-acid-starvation
#9
Hayden Weng Siong Tan, Arthur Yi Loong Sim, Yun Chau Long
Activation of autophagy and elevation of glutamine synthesis represent key adaptations to maintain amino acid balance during starvation. In this study, we investigate the role of autophagy and glutamine on the regulation of mTORC1, a critical kinase that regulates cell growth and proliferation. We report that supplementation of glutamine alone is sufficient to restore mTORC1 activity during prolonged amino acid starvation. Inhibition of autophagy abolishes the restorative effect of glutamine, suggesting that reactivation of mTORC1 is autophagy-dependent...
August 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28812766/modulatory-effects-of-arginine-glutamine-and-branched-chain-amino-acids-on-heat-shock-proteins-immunity-and-antioxidant-response-in-exercised-rats
#10
Carolina Soares Moura, Pablo Christiano Barboza Lollo, Priscila Neder Morato, Eder Muller Risso, Jaime Amaya-Farfan
Heat shock proteins (HSPs) are endogenous proteins whose function is to maintain the cell's tolerance to insult, and glutamine supplementation is known to increase HSP expression during intense exercise. Since few studies have addressed the possibility that supplementation with other amino acids could have similar effects to that of glutamine, our objective was to evaluate the effects of leucine, valine, isoleucine and arginine as potential stimulators of HSPs 25, 60, 70 and 90 in rats subjected to acute exercise as a stressing factor...
August 16, 2017: Food & Function
https://www.readbyqxmd.com/read/28811348/a-critical-role-of-glutamine-and-asparagine-%C3%AE-nitrogen-in-nucleotide-biosynthesis-in-cancer-cells-hijacked-by-an-oncogenic-virus
#11
Ying Zhu, Tingting Li, Suzane Ramos da Silva, Jae-Jin Lee, Chun Lu, Hyungjin Eoh, Jae U Jung, Shou-Jiang Gao
While glutamine is a nonessential amino acid that can be synthesized from glucose, some cancer cells primarily depend on glutamine for their growth, proliferation, and survival. Numerous types of cancer also depend on asparagine for cell proliferation. The underlying mechanisms of the glutamine and asparagine requirement in cancer cells in different contexts remain unclear. In this study, we show that the oncogenic virus Kaposi's sarcoma-associated herpesvirus (KSHV) accelerates the glutamine metabolism of glucose-independent proliferation of cancer cells by upregulating the expression of numerous critical enzymes, including glutaminase 2 (GLS2), glutamate dehydrogenase 1 (GLUD1), and glutamic-oxaloacetic transaminase 2 (GOT2), to support cell proliferation...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28780590/alpha-ketoglutarate-enhances-freeze-thaw-tolerance-and-prevents-carbohydrate-induced-cell-death-of-the-yeast-saccharomyces-cerevisiae
#12
Maria M Bayliak, Olha V Hrynkiv, Roksolana V Knyhynytska, Volodymyr I Lushchak
Stress resistance and fermentative capability are important quality characteristics of baker's yeast. In the present study, we examined protective effects of exogenous alpha-ketoglutarate (AKG), an intermediate of the tricarboxylic acid cycle and amino acid metabolism, against freeze-thaw and carbohydrate-induced stresses in the yeast Saccharomyces cerevisiae. Growth on AKG-supplemented medium prevented a loss of viability and improved fermentative capacity of yeast cells after freeze-thaw treatment. The cells grown in the presence of AKG had higher levels of amino acids (e...
August 5, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28765035/effects-of-adding-different-levels-of-glutamine-to-modified-beltsville-extender-on-the-survival-of-frozen-rooster-semen
#13
Aytak Bakhshayesh Khiabani, Gholamali Moghaddam, Hossein Daghigh Kia
The aim of the present study was to investigate the effects of l-glutamine on the quality of frozen-thawed rooster semen. Semen samples were collected from eight mature roosters (Ross 308). After initial semen assessments, samples of adequate quality were mixed together and diluted with modified Beltsville extender without l-glutamine (control) and supplemented with 2.5, 5, and 7.5mM l-glutamine. Semen straws were subjected to cryopreservation and evaluated twice at 15-day intervals. After thawing, sperm viability, total and progressive sperm motilities were measured by Eosin-Nigrosine and Computer-Aided Sperm Analysis (CASA), respectively...
July 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28760433/branched-chain-amino-acid-supplementation-in-treatment-of-liver-cirrhosis-updated-views-on-how-to-attenuate-their-harmful-effects-on-cataplerosis-and-ammonia-formation
#14
REVIEW
Milan Holeček
Branched-chain amino acid (BCAA; valine, leucine, and isoleucine) supplementation is common for patients with liver cirrhosis due to decreased levels of BCAA in the blood plasma of these patients, which plays a role in pathogenesis of hepatic encephalopathy and cachexia. The unique pharmacologic properties of BCAA also are a factor for use as supplementation in this population. In the present article, BCAA is shown to provide nitrogen to alpha-ketoglutarate (α-KG) for synthesis of glutamate, which is a substrate for ammonia detoxification to glutamine (GLN) in the brain and muscles...
September 2017: Nutrition
https://www.readbyqxmd.com/read/28745430/supplementation-of-nucleosides-during-selection-can-reduce-sequence-variant-levels-in-cho-cells-using-gs-msx-selection-system
#15
Danming Tang, Cynthia Lam, Salina Louie, Kam Hon Hoi, David Shaw, Mandy Yim, Brad Snedecor, Shahram Misaghi
In the process of generating stable monoclonal antibody (mAb) producing cell lines, reagents such as Methotrexate (MTX) or Methionine Sulfoximine (MSX) are often used. However, using such selection reagent(s) increases the possibility of having higher occurrence of sequence variants in the expressed antibody molecules due to the effects of MTX or MSX on de novo nucleotide synthesis. Since MSX inhibits glutamine synthase (GS) and results in both amino acid and nucleoside starvation, we questioned whether supplementing nucleosides into the media could lower sequence variant levels without affecting titer...
July 26, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28740213/functional-and-transcriptomic-characterization-of-peritoneal-immune-modulation-by-addition-of-alanyl-glutamine-to-dialysis-fluid
#16
Rebecca Herzog, Lilian Kuster, Julia Becker, Tobias Gluexam, Dietmar Pils, Andreas Spittler, Manoj K Bhasin, Seth L Alper, Andreas Vychytil, Christoph Aufricht, Klaus Kratochwill
Peritonitis remains a major cause of morbidity and mortality during chronic peritoneal dialysis (PD). Glucose-based PD fluids reduce immunological defenses in the peritoneal cavity. Low concentrations of peritoneal extracellular glutamine during PD may contribute to this immune deficit. For these reasons we have developed a clinical assay to measure the function of the immune-competent cells in PD effluent from PD patients. We then applied this assay to test the impact on peritoneal immune-competence of PD fluid supplementation with alanyl-glutamine (AlaGln) in 6 patients in an open-label, randomized, crossover pilot trial (EudraCT 2012-004004-36), and related the functional results to transcriptome changes in PD effluent cells...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28732794/glutamine-protects-intestinal-calcium-absorption-against-oxidative-stress-and-apoptosis
#17
Luciana Moine, Gabriela Díaz de Barboza, Adriana Pérez, Mercedes Benedetto, Nori Tolosa de Talamoni
The aim of this study was to investigate whether glutamine (GLN) could block the inhibition of the intestinal Ca(2+) absorption caused by menadione (MEN), and elucidate the underlying mechanisms. To do this, one-month old chicks were divided in four groups: 1) controls, 2) MEN treated, 3) GLN treated and 4) GLN treated before or after MEN treatment. Intestinal Ca(2+) absorption as well as protein expression of molecules involved in the transcellular Ca(2+) pathway were determined. Glutathione (GSH) and superoxide anion and activity of enzymes of the antioxidant system were evaluated...
July 19, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28728379/effects-of-dietary-glutamine-and-arginine-supplementation-on-performance-intestinal-morphology-and-ascites-mortality-in-broiler-chickens-reared-under-cold-environment
#18
Rahim Abdulkarimi, Mohammad Hossien Shahir, Mohsen Daneshyar
Objective: An experiment was conducted to evaluate the effects of dietary glutamine (Gln) and arginine (Arg) supplementation on performance, intestinal morphology and ascites mortality in broilers. Methods: A total of 675 day old chicks were randomly allocated to 9 experimental groups in a 3×3 factorial arrangement based on a completely randomized design with 5 replicates of 15 chicks. Three levels of dietary Gln (0, 0.5 and 1%) and Arg (100, 130% and 160% of Ross recommendation) supplementation were used in ascites inducing condition (15±1 ˚C) from 7 to 42 days of age...
June 26, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28717702/management-of-chemoradiation-induced-mucositis-in-head-and-neck-cancers-with-oral-glutamine
#19
Lucy Pattanayak, Niharika Panda, Manoj Kumar Dash, Sumita Mohanty, Sagarika Samantaray
PURPOSE: Head and neck cancers are the third most common cancers worldwide. Oral mucositis is the most common toxicity seen in patients who receive chemoradiation to treat head and neck cancer. The aim of this study was to evaluate the efficacy and safety of oral glutamine supplementation in these patients. MATERIALS AND METHODS: From December 2013 to December 2014, we randomly assigned to two arms 162 patients who had squamous cell carcinoma of the head and neck...
August 2016: Journal of Global Oncology
https://www.readbyqxmd.com/read/28713382/recent-advances-on-nutrition-in-treatment-of-acute-pancreatitis
#20
REVIEW
Li-Long Pan, Jiahong Li, Muhammad Shamoon, Madhav Bhatia, Jia Sun
Acute pancreatitis (AP) is a common abdominal acute inflammatory disorder and the leading cause of hospital admission for gastrointestinal disorders in many countries. Clinical manifestations of AP vary from self-limiting local inflammation to devastating systemic pathological conditions causing significant morbidity and mortality. To date, despite extensive efforts in translating promising experimental therapeutic targets in clinical trials, disease-specific effective remedy remains obscure, and supportive care has still been the primary treatment for this disease...
2017: Frontiers in Immunology
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