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https://www.readbyqxmd.com/read/28445957/peripheral-kynurenine-tryptophan-ratio-is-not-a-reliable-marker-of-systemic-indoleamine-2-3-dioxygenase-a-lesson-drawn-from-patients-on-hemodialysis
#1
Yuanhan Chen, Zhen Xie, Chenggen Xiao, Min Zhang, Zhilian Li, Jianteng Xie, Yusheng Zhang, Xingchen Zhao, Pengfei Zeng, Liyi Mo, Xinling Liang, Wei Shi
Indoleamine 2,3-dioxygenase (IDO) has emerged as a pivotal enzyme for mediating immune tolerance. Because IDO metabolizes tryptophan into kynurenine, the plasma kynurenine/tryptophan (Kyn/Trp) ratio has been widely used as a marker of systemic IDO. Here, we evaluated the clinical value of using the plasma Kyn/Trp ratio to estimate cell-mediated immune responses to tuberculin skin testing and risk of new bacterial infection. We also compared the Kyn/Trp ratio to a novel IDO marker, the IDO median fluorescence index (MFI) of peripheral blood mononuclear cells, which was determined by flow cytometry...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28443667/identification-of-a-phosphodiesterase-inhibiting-fraction-from-roasted-coffee-coffea-arabica-through-activity-guided-fractionation
#2
Teresa Röhrig, David Liesenfeld, Elke Richling
Recent reports that coffee can significantly inhibit cAMP phosphodiesterases (PDE) in vitro, as well as in vivo, have added another beneficial effect of coffee consumption. However, the PDE-inhibiting substances remain mostly unknown. We chose activity-guided fractionation and an in vitro test system to identify the coffee components responsible for PDE inhibition. This approach indicated that a fraction of melanoidins reveals strong PDE inhibiting potential (IC50 = 130 ± 42 µg/mL). These melanoidins were characterized as water soluble, low molecular weight melanoidins (< 3kDa) with a nitrogen content of 4...
April 26, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28443082/inbred-mouse-populations-exhibit-intergenerational-changes-in-intestinal-microbiota-composition-and-function-following-introduction-to-a-facility
#3
Jocelyn M Choo, Paul J Trim, Lex E X Leong, Guy C J Abell, Carly Brune, Nicole Jeffries, Steve Wesselingh, T N Dear, Marten F Snel, Geraint B Rogers
Inbred mice are used to investigate many aspects of human physiology, including susceptibility to disease and response to therapies. Despite increasing evidence that the composition and function of the murine intestinal microbiota can substantially influence a broad range of experimental outcomes, relatively little is known about microbiome dynamics within experimental mouse populations. We investigated changes in the intestinal microbiome between C57BL/6J mice spanning six generations (assessed at generations 1, 2, 3, and 6), following their introduction to a stringently controlled facility...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28443016/genetics-of-aggression-in-alzheimer-s-disease-ad
#4
Walter J Lukiw, Evgeny I Rogaev
Alzheimer's disease (AD) is a terminal, age-related neurological syndrome exhibiting progressive cognitive and memory decline, however AD patients in addition exhibit ancillary neuropsychiatric symptoms (NPSs) and these include aggression. In this communication we provide recent evidence for the mis-regulation of a small family of genes expressed in the human hippocampus that appear to be significantly involved in expression patterns common to both AD and aggression. DNA array- and mRNA transcriptome-based gene expression analysis and candidate gene association and/or genome-wide association studies (CGAS, GWAS) of aggressive attributes in humans have revealed a surprisingly small subset of six brain genes that are also strongly associated with altered gene expression patterns in AD...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28442765/the-gpr139-reference-agonists-1a-and-7c-and-tryptophan-and-phenylalanine-share-a-common-binding-site
#5
Anne Cathrine Nøhr, Willem Jespers, Mohamed A Shehata, Leonard Floryan, Vignir Isberg, Kirsten Bayer Andersen, Johan Åqvist, Hugo Gutiérrez-de-Terán, Hans Bräuner-Osborne, David E Gloriam
GPR139 is an orphan G protein-coupled receptor expressed in the brain, in particular in the habenula, hypothalamus and striatum. It has therefore been suggested that GPR139 is a possible target for metabolic disorders and Parkinson's disease. Several surrogate agonist series have been published for GPR139. Two series published by Shi et al. and Dvorak et al. included agonists 1a and 7c respectively, with potencies in the ten-nanomolar range. Furthermore, Isberg et al. and Liu et al. have previously shown that tryptophan (Trp) and phenylalanine (Phe) can activate GPR139 in the hundred-micromolar range...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28442665/the-amino-acid-at-position-624-in-the-glycoprotein-of-sftsv-severe-fever-with-thrombocytopenia-virus-plays-a-critical-role-in-low-ph-dependent-cell-fusion-activity
#6
Yoshimi Tsuda, Manabu Igarashi, Ryo Ito, Sanae Nishio, Kenta Shimizu, Kumiko Yoshimatsu, Jiro Arikawa
Severe fever with thrombocytopenia syndrome virus (SFTSV) is a novel phlebovirus responsible for causing an emerging zoonotic disease. We previously established subclones from SFTSV strain YG1 based on differences in low-pH-dependent cell fusion activities and found two amino acid substitutions, Y328H and R624W, in the envelope glycoprotein (GP) of high fusion subclones. In this study, we show that transiently expressed GP with the R624W mutation, but not the Y328H mutation, induced cell fusion under acidic conditions...
2017: Biomedical Research
https://www.readbyqxmd.com/read/28440408/identification-of-potential-gene-targets-in-systemic-vasculitis-using-dna-microarray-analysis
#7
Yiwen Feng, Miao Zheng, Shujie Gan, Lei Zhang, Zhong Wan, Yanping Zhang, Qin Qian, Jingdong Tang
The present study aimed to identify the involvement of critical genes in systemic vasculitis, to gain an improved understanding of the molecular circuity and to investigate novel potential gene targets for systemic vasculitis treatment. The dual‑color cDNA microarray data of GSE16945, consisting of peripheral mononuclear blood cell specimens from 13 patients with systemic vasculitis and 16 healthy controls, was downloaded from the Gene Expression Omnibus database. Differentially expressed genes (DEGs) were screened in systemic vasculitis compared with controls using BRB ArrayTools, followed by the construction of a protein‑protein interaction (PPI) network using the clusterProfiler package, and significant functional interaction (FI) module selection...
April 11, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28439830/peptide-based-isolation-of-argonaute-protein-complexes-using-ago-app
#8
Judith Hauptmann, Gunter Meister
Argonaute (Ago) proteins bind small RNAs such as microRNAs (miRNAs) or short interfering RNAs (siRNAs), which guide them to distinct mRNAs for post-transcriptional gene silencing. Mammalian miRNA-guided gene silencing pathways mainly lead to translational repression and mRNA destabilization. To facilitate these processes, Ago proteins bind members of the GW protein family, which form central interaction platforms for the recruitment of downstream effector proteins. GW proteins use tryptophane residues (W) to bind to the surface of Ago proteins...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28439468/a-link-between-central-kynurenine-metabolism-and-bone-strength-in-rats-with-chronic-kidney-disease
#9
Bartlomiej Kalaska, Krystyna Pawlak, Ewa Oksztulska-Kolanek, Tomasz Domaniewski, Beata Znorko, Malgorzata Karbowska, Aleksandra Citkowska, Joanna Rogalska, Alicja Roszczenko, Malgorzata M Brzoska, Dariusz Pawlak
BACKGROUND: Disturbances in mineral and bone metabolism represent one of the most complex complications of chronic kidney disease (CKD). Serotonin, a monoamine synthesized from tryptophan, may play a potential role in bone metabolism. Brain-derived serotonin exerts a positive effect on the bone structure by limiting bone resorption and enhancing bone formation. Tryptophan is the precursor not only to the serotonin but also and primarily to kynurenine metabolites. The ultimate aim of the present study was to determine the association between central kynurenine metabolism and biomechanical as well as geometrical properties of bone in the experimental model of the early stage of CKD...
2017: PeerJ
https://www.readbyqxmd.com/read/28439458/the-genomic-sequence-of-exiguobacterium-chiriqhucha-str-n139-reveals-a-species-that-thrives-in-cold-waters-and-extreme-environmental-conditions
#10
Ana Gutiérrez-Preciado, Carlos Vargas-Chávez, Mariana Reyes-Prieto, Omar F Ordoñez, Diego Santos-García, Tania Rosas-Pérez, Jorge Valdivia-Anistro, Eria A Rebollar, Andrés Saralegui, Andrés Moya, Enrique Merino, María Eugenia Farías, Amparo Latorre, Valeria Souza
We report the genome sequence of Exiguobacterium chiriqhucha str. N139, isolated from a high-altitude Andean lake. Comparative genomic analyses of the Exiguobacterium genomes available suggest that our strain belongs to the same species as the previously reported E. pavilionensis str. RW-2 and Exiguobacterium str. GIC 31. We describe this species and propose the chiriqhucha name to group them. 'Chiri qhucha' in Quechua means 'cold lake', which is a common origin of these three cosmopolitan Exiguobacteria. The 2,952,588-bp E...
2017: PeerJ
https://www.readbyqxmd.com/read/28438641/improving-therapeutics-in-anorexia-nervosa-with-tryptophan
#11
REVIEW
Darakhshan Jabeen Haleem
A growing body of evidence suggests that our diet is an important contributing factor in the development, management and prevention of a number of psychiatric illnesses. Tryptophan, an essential amino acid, is the sole precursor of neurotransmitter 5-hydroxytryptamine (5-HT; serotonin). Administration of tryptophan can boost serotonin neurotransmission to produce therapeutically important effects in serotonin deficiency disorders. Anorexia nervosa (AN) an eating disorder associated with high levels of psychiatric comorbidity including psychosis, hyperactivity, depression and anxiety has highest lethality of all psychiatric illnesses...
April 21, 2017: Life Sciences
https://www.readbyqxmd.com/read/28434742/endocrine-and-metabolic-changes-in-transition-dairy-cows-are-affected-by-prepartum-infusions-of-a-serotonin-precursor
#12
Lorenzo E Hernández-Castellano, Laura L Hernandez, Helga Sauerwein, Rupert M Bruckmaier
Serotonin (5-HT) has been shown to be involved in calcium homeostasis, modulating calcium concentration in blood. In addition, 5-HT participates in a variety of metabolic pathways, mainly through the modulation of glucose and lipid metabolism. The hypothesis of the present study was that the prepartum administration of 5-hydroxy-l-tryptophan (5-HTP), a 5-HT precursor, would affect endocrine systems related to calcium homeostasis, and interact with other endocrine and metabolic pathways during the transition period...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434116/activation-of-the-serotonin-pathway-is-associated-with-poor-outcome-in-copd-exacerbation-results-of-a-long-term-cohort-study
#13
Marc A Meier, Manuel Ottiger, Alaadin Vögeli, Christian Steuer, Luca Bernasconi, Robert Thomann, Mirjam Christ-Crain, Christoph Henzen, Claus Hoess, Werner Zimmerli, Andreas Huber, Beat Mueller, Philipp Schuetz
BACKGROUND/INTRODUCTION: Indoleamine 2,3-dioxygenase (IDO) metabolizes tryptophan to kynurenine. An increase of its activity is associated with severity in patients with pneumonia. In chronic obstructive pulmonary disease (COPD) patients, an elevation of serotonin has been reported. Experimental models showed that cigarette smoke inhibits monoamine oxidase (MAO) leading to higher levels of serotonin. We investigated the prognostic ability of tryptophan, serotonin, kynurenine, IDO, and tryptophan hydroxylase (TPH) to predict short- and long-term outcomes in patients with a COPD exacerbation...
April 22, 2017: Lung
https://www.readbyqxmd.com/read/28433458/linking-the-biological-underpinnings-of-depression-role-of-mitochondria-interactions-with-melatonin-inflammation-sirtuins-tryptophan-catabolites-dna-repair-and-oxidative-and-nitrosative-stress-with-consequences-for-classification-and-cognition
#14
REVIEW
George Anderson
The pathophysiological underpinnings of neuroprogressive processes in recurrent major depressive disorder (rMDD) are reviewed. A wide array of biochemical processes underlie MDD presentations and their shift to a recurrent, neuroprogressive course, including: increased immune-inflammation, tryptophan catabolites (TRYCATs), mitochondrial dysfunction, aryl hydrocarbonn receptor activation, and oxidative and nitrosative stress (O&NS), as well as decreased sirtuins and melatonergic pathway activity. These biochemical changes may have their roots in central, systemic and/or peripheral sites, including in the gut, as well as in developmental processes, such as prenatal stressors and breastfeeding consequences...
April 19, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28432842/low-grade-inflammation-and-tryptophan-kynurenine-pathway-activation-are-associated-with-adverse-cardiac-remodeling-in-primary-hyperparathyroidism-the-epath-trial
#15
Nicolas Verheyen, Andreas Meinitzer, Martin Robert Grübler, Klemens Ablasser, Ewald Kolesnik, Astrid Fahrleitner-Pammer, Evgeny Belyavskiy, Christian Trummer, Verena Schwetz, Elisabeth Pieske-Kraigher, Jakob Voelkl, Ioana Alesutan, Cristiana Catena, Leonardo Alberto Sechi, Helmut Brussee, Dirk von Lewinski, Winfried März, Burkert Pieske, Stefan Pilz, Andreas Tomaschitz
BACKGROUND: Primary hyperparathyroidism (pHPT) is associated with low-grade inflammation, left ventricular hypertrophy and increased cardiovascular mortality, but the association between inflammatory markers and parameters of adverse cardiac remodeling is unknown. We investigated the relationship between C-reactive protein (CRP), the essential amino acid tryptophan and its pro-inflammatory derivatives kynurenine and quinolinic acid (QUIN) with echocardiographic parameters. METHODS: Cross-sectional baseline data from the "Eplerenone in Primary Hyperparathyroidism" trial were analyzed...
April 22, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28432632/tryptophan-fluorescence-yields-and-lifetimes-as-a-probe-of-conformational-changes-in-human-glucokinase
#16
Bogumil Zelent, Chris Bialas, Ignacy Gryczynski, Pan Chen, Rahul Chib, Karina Lewerissa, Maria G Corradini, Richard D Ludescher, Jane M Vanderkooi, Franz M Matschinsky
Five variants of glucokinase (ATP-D-hexose-6-phosphotransferase, EC 2.7.1.1) including wild type and single Trp mutants with the Trp residue at positions 65, 99, 167 and 257 were prepared. The fluorescence of Trp in all locations studied showed intensity changes when glucose bound, indicating that conformational change occurs globally over the entire protein. While the fluorescence quantum yield changes upon glucose binding, the enzyme's absorption spectra, emission spectra and fluorescence lifetimes change very little...
April 22, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28431917/effective-modification-of-cell-death-inducing-intracellular-peptides-by-means-of-a-photo-cleavable-peptide-array-based-screening-system
#17
Ikko Kozaki, Kazunori Shimizu, Hiroyuki Honda
Intracellular functional peptides that play a significant role inside cells have been receiving a lot of attention as regulators of cellular activity. Previously, we proposed a novel screening system for intracellular functional peptides; it combined a photo-cleavable peptide array system with cell-penetrating peptides (CPPs). Various peptides can be delivered into cells and intracellular functions of the peptides can be assayed by means of our system. The aim of the present study was to demonstrate that the proposed screening system can be used for assessing the intracellular activity of peptides...
April 18, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28430446/piecing-together-the-allosteric-patterns-of-chaperonin-groel
#18
Jin Chen, Qian Zhang, Weitong Ren, Wenfei Li
Despite considerable effort, elucidating allostery of large macromolecular assemblies at a molecular level in solution remains technically challenging due to its structural complexity. Here we have employed an approach combining amide backbone hydrogen/deuterium exchange coupled with mass spectrometry, fluorescence spectroscopy and molecular simulations to characterize allosteric patterns of chaperonin GroEL, a ~800 kDa tetradecamer from E. coli. Using available crystal structures of GroEL, we quantitatively map out GroEL allosteric changes in solution by resolving exchange behaviors of 133 overlapping proteolytic peptides with more than 95% sequence coverage...
April 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28429670/expression-of-dominant-negative-k6w-ubiquitin-in-the-lens-epithelium-via-an-adenoviral-vector-delays-posterior-capsule-opacification-in-a-rabbit-model
#19
Xuan Bao, Min Hou, Ruiping Peng, Furong Luo, Mingxing Wu
PURPOSE: Ubiquitin is involved in cell proliferation and differentiation, and the objective of this study is to investigate the potential of dominant negative Ubiquitin (Ub) with a lysine to tryptophan mutation at the 6 position (K6W) through an adenoviral expression vector in the prevention of posterior capsule opacification (PCO) in a rabbit PCO model. METHODS: Recombinant dominant negative K6W-Ub adenovirus (RAd-K6W-Ub) with green fluorescent protein (RAd-K6W-Ub/GFP) and RAd-GFP viruses (control) were generated with QBI-HEK 293A cells...
March 31, 2017: Current Molecular Medicine
https://www.readbyqxmd.com/read/28428084/metabolomics-of-fescue-toxicosis-in-grazing-beef-steers
#20
Ryan S Mote, Nicholas S Hill, Karan Uppal, ViLinh T Tran, Dean P Jones, Nikolay M Filipov
Fescue toxicosis (FT) results from consumption of tall fescue (Lolium arundinaceum) infected with an endophyte (Epichloë coenophiala) that produces ergot alkaloids (EA), which are considered key etiological agents of FT. Decreased weight gains, hormonal imbalance, circulating cholesterol disruption, and decreased volatile fatty acid absorption suggest toxic (E+) fescue-induced metabolic perturbations. Employing untargeted high-resolution metabolomics (HRM) to analyze E+ grazing-induced plasma and urine metabolome changes, fescue-naïve Angus steers were placed on E+ or non-toxic (Max-Q) fescue pastures and plasma and urine were sampled before, 1, 2, 14, and 28 days after pasture assignment...
April 18, 2017: Food and Chemical Toxicology
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