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https://www.readbyqxmd.com/read/28339124/gliadin-reactive-t-cells-in-italian-children-from-preventcd-cohort-at-high-risk-for-celiac-disease
#1
Alessandra Camarca, Renata Auricchio, Stefania Picascia, Olga Fierro, Mariantonia Maglio, Erasmo Miele, Basilio Malamisura, Luigi Greco, Riccardo Troncone, Carmen Gianfrani
BACKGROUND: Newborns at high risk for celiac disease (CD) were recruited in Italy in the context of the PreventCD Study and closely monitored for CD, from 4 months up to a mean age of 8 years at follow-up. The aim of our study was to investigate intestinal T cell reactivity to gliadin at the first clinical and/or serological signs of CD. METHODS: Gliadin-reactive T cell lines were generated from intestinal biopsies of 19 HLA-DQ2 or HLA-DQ8 positive children. At biopsy, 11 children had a diagnosis of acute CD, two of potential CD, and six were non-celiac controls...
March 24, 2017: Pediatric Allergy and Immunology
https://www.readbyqxmd.com/read/28327674/quantitation-of-the-immunodominant-33-mer-peptide-from-%C3%AE-gliadin-in-wheat-flours-by-liquid-chromatography-tandem-mass-spectrometry
#2
Kathrin Schalk, Christina Lang, Herbert Wieser, Peter Koehler, Katharina Anne Scherf
Coeliac disease (CD) is triggered by the ingestion of gluten proteins from wheat, rye, and barley. The 33-mer peptide from α2-gliadin has frequently been described as the most important CD-immunogenic sequence within gluten. However, from more than 890 published amino acid sequences of α-gliadins, only 19 sequences contain the 33-mer. In order to make a precise assessment of the importance of the 33-mer, it is necessary to elucidate which wheat species and cultivars contain the peptide and at which concentrations...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315033/the-cd-that-pays-dividends-more-than-15-years-of-deamidated-gliadin-peptide-antibodies
#3
EDITORIAL
Julio C Bai, Elena F Verdú
No abstract text is available yet for this article.
March 17, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28300220/effects-of-gliadin-consumption-on-the-intestinal-microbiota-and-metabolic-homeostasis-in-mice-fed-a-high-fat-diet
#4
Li Zhang, Daniel Andersen, Henrik Munch Roager, Martin Iain Bahl, Camilla Hartmann Friis Hansen, Niels Banhos Danneskiold-Samsøe, Karsten Kristiansen, Ilinca Daria Radulescu, Christian Sina, Henrik Lauritz Frandsen, Axel Kornerup Hansen, Susanne Brix, Lars I Hellgren, Tine Rask Licht
Dietary gluten causes severe disorders like celiac disease in gluten-intolerant humans. However, currently understanding of its impact in tolerant individuals is limited. Our objective was to test whether gliadin, one of the detrimental parts of gluten, would impact the metabolic effects of an obesogenic diet. Mice were fed either a defined high-fat diet (HFD) containing 4% gliadin (n = 20), or a gliadin-free, isocaloric HFD (n = 20) for 23 weeks. Combined analysis of several parameters including insulin resistance, histology of liver and adipose tissue, intestinal microbiota in three gut compartments, gut barrier function, gene expression, urinary metabolites and immune profiles in intestinal, lymphoid, liver and adipose tissues was performed...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300172/genome-wide-analysis-of-complex-wheat-gliadins-the-dominant-carriers-of-celiac-disease-epitopes
#5
Da-Wei Wang, Da Li, Junjun Wang, Yue Zhao, Zhaojun Wang, Guidong Yue, Xin Liu, Huanju Qin, Kunpu Zhang, Lingli Dong, Daowen Wang
Gliadins, specified by six compound chromosomal loci (Gli-A1/B1/D1 and Gli-A2/B2/D2) in hexaploid bread wheat, are the dominant carriers of celiac disease (CD) epitopes. Because of their complexity, genome-wide characterization of gliadins is a strong challenge. Here, we approached this challenge by combining transcriptomic, proteomic and bioinformatic investigations. Through third-generation RNA sequencing, full-length transcripts were identified for 52 gliadin genes in the bread wheat cultivar Xiaoyan 81...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28293318/gluten-sensitivity-among-egyptian-infants-with-congenital-heart-disease
#6
Inas R El-Alameey, Hanaa H Ahmed, Sawsan M Tawfik, Fawzia Hassaballa, Ayman M Abdel Gawad, Eman Eltahlawy
BACKGROUND: Gastrointestinal symptoms are a common feature in infants with congenital heart disease. AIM: This study was designed to evaluate age-dependent serum levels of antigliadin antibodies among malnourished Egyptian infants with congenital heart disease (CHD) and gastrointestinal symptoms. SUBJECTS AND METHODS: This case-control study conducted on 60 infants with established congenital heart disease. They were subdivided into cyanotic and acyanotic groups, and each group includes 30 patients compared with thirty apparently healthy infants of matched age, sex, and social class...
March 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28289425/characterization-of-changes-in-gluten-proteins-in-low-gliadin-transgenic-wheat-lines-in-response-to-application-of-different-nitrogen-regimes
#7
María Dolores García-Molina, Francisco Barro
Gluten proteins are major determinants of the bread making quality of wheat but also of important gluten-related disorders. The gluten protein accumulation during grain filling is strongly influenced by nitrogen fertilization. We have characterized the gluten proteins in low-gliadin wheat lines as influenced by nitrogen treatments in two experiments. These transgenic lines, D783, D793, C655, D577, and E82 were obtained by using two different RNAi silencing fragments and two endosperm-specific promoters to drive the silencing fragments (d-hordein and γ-gliadin)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28277888/a-screening-approach-for-identifying-gliadin-neutralizing-antibodies-on-epithelial-intestinal-caco-2-cells
#8
Harald Hundsberger, Anita Koppensteiner, Elisabeth Hofmann, Doris Ripper, Maren Pflüger, Valerie Stadlmann, Christian Theodor Klein, Birgit Kreiseder, Michael Katzlinger, Andreas Eger, Florian Forster, Albert Missbichler, Christoph Wiesner
Celiac disease (CD) is a chronic inflammatory condition caused by the ingestion of gliadin-containing food in genetically susceptible individuals. Undigested peptides of gliadin exert various effects, including increased intestinal permeability and inflammation in the small intestine. Although many therapeutic approaches are in development, a gluten-free diet is the only effective treatment for CD. Affecting at least 1% of the population in industrialized countries, it is important to generate therapeutic options against CD...
March 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28250436/towards-celiac-safe-foods-decreasing-the-affinity-of-transglutaminase-2-for-gliadin-by-addition-of-ascorbyl-palmitate-and-zncl2-as-detoxifiers
#9
N Engstrom, P Saenz-Méndez, J Scheers, N Scheers
Initiation of celiac disease is triggered in the gastrointestinal tract by transglutaminase 2 (TG2) assisted deamidation of gluten peptides. Deamidation is a side-reaction to transamidation and occurs if primary amines are absent. In contrast to deamidation, transamidation does not trigger an immune response. The aim of the study was to identify a suitable food additive that interacts with TG2 binding motives in gluten-derived peptides to prevent deamidation/transamidation. Homology modelling of α2-gliadin and computational screening of compounds for their binding affinity to a common TG2 binding motive (P)QLP were done by using computational approaches followed by experimental testing of TG2 activity...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28244676/what-is-gluten
#10
REVIEW
Jessica R Biesiekierski
Gluten is the main storage protein of wheat grains. Gluten is a complex mixture of hundreds of related but distinct proteins, mainly gliadin and glutenin. Similar storage proteins exist as secalin in rye, hordein in barley, and avenins in oats and are collectively referred to as "gluten." The objective was to discuss the biochemical and functional properties of the gluten proteins, including structure, sources, and dietary intakes. Literature was reviewed from food science and nutrition journals. The gluten protein networks vary because of different components and sizes, and variability caused by genotype, growing conditions, and technological processes...
March 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28243563/comparison-of-four-functionalization-methods-of-gold-nanoparticles-for-enhancing-the-enzyme-linked-immunosorbent-assay-elisa
#11
Paula Ciaurriz, Fátima Fernández, Edurne Tellechea, Jose F Moran, Aaron C Asensio
The enzyme-linked immunosorbent assay (ELISA) technique is based on the specific recognition ability of the molecular structure of an antigen (epitope) by an antibody and is likely the most important diagnostic technique used today in bioscience. With this methodology, it is possible to diagnose illness, allergies, alimentary fraud, and even to detect small molecules such as toxins, pesticides, heavy metals, etc. For this reason, any procedures that improve the detection limit, sensitivity or reduce the analysis time could have an important impact in several fields...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28242933/fractionation-of-unreduced-gluten-proteins-on-sec-and-their-relationship-with-cookie-quality-characteristics
#12
Nisha Chaudhary, Priya Dangi, B S Khatkar
The size distribution assessment of unreduced wheat gluten proteins of commercial Indian wheat varieties was examined using Size-Exclusion Fast Protein Liquid Chromatography. Elution profiles were fractionated into five peaks, with the molecular weights of eluting peaks as 130-30, 55-20, 28-10 and <10 kDa (IV and V), respectively. Peak I (glutenins) and II (gliadins) exhibited contrary results with AWRC (r = 0.928** and r = -0.831**), R/E ratio (r = 0.745** and r = -0.869**), gluten index (r = 0...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28241119/adsorption-and-distribution-of-edible-gliadin-nanoparticles-at-the-air-water-interface
#13
Dengfeng Peng, Weiping Jin, Jing Li, Wenfei Xiong, Yaqiong Pei, Yuntao Wang, Yan Li, Bin Li
Edible gliadin nanoparticles (GNPs) were fabricated using the anti-solvent method. They possessed unique high foamability and foam stability. An increasing concentration of GNPs accelerated their initial adsorption speed from the bulk phase to the interface and raised the viscoelastic modulus of interfacial films. High foamability (174.2 ± 6.4%) was achieved at the very low concentration of GNPs (1 mg/mL), which was much better than that of ovalbumin and sodium caseinate. Three stages of adsorption kinetics at the air/water interface were characterized...
March 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28231144/effects-of-two-step-transamidation-of-wheat-semolina-on-the-technological-properties-of-gluten
#14
Salvatore Moscaritolo, Lucia Treppiccione, Antonio Ottombrino, Mauro Rossi
Celiac disease (CD) is an immune-mediated disorder caused by the ingestion of wheat gluten. A lifelong, gluten-free diet is required to alleviate symptoms and to normalize the intestinal mucosa. We previously found that transamidation reaction by microbial transglutaminase (mTG) was effective in down-regulating the gliadin-specific immune response in CD patients. In this study, the two-step transamidation protocol was adopted to treat commercial wheat semolina on a pilot scale. The effectiveness of the enzymatic reaction was tested by means of consolidated biochemical and immunological methods on isolated prolamins...
June 29, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28208686/identification-of-autophagy-related-genes-and-their-regulatory-mirnas-associated-with-celiac-disease-in-children
#15
Sergio Comincini, Federico Manai, Cristina Meazza, Sara Pagani, Carolina Martinelli, Noemi Pasqua, Gloria Pelizzo, Marco Biggiogera, Mauro Bozzola
Celiac disease (CD) is a severe genetic autoimmune disorder, affecting about one in 100 people, where the ingestion of gluten leads to damage in the small intestine. Diagnosing CD is quite complex and requires blood tests and intestinal biopsy examinations. Controversy exists regarding making the diagnosis without biopsy, due to the large spectrum of manifesting symptoms; furthermore, small-intestinal gastroscopy examinations have a relatively complex management in the pediatric population. To identify novel molecular markers useful to increase the sensitivity and specificity in the diagnosis of pediatric CD patients, the expression levels of two key autophagy executor genes (ATG7 and BECN1) and their regulatory validated miRNAs (miR-17 and miR-30a, respectively) were analyzed by relative quantitative real-time-PCR on a cohort of confirmed CD patients compared to age-related controls...
February 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28190352/polyphenol-interactions-mitigate-the-immunogenicity-and-allergenicity-of-gliadins
#16
Maxime Pérot, Roberta Lupi, Sylvain Guyot, Carine Delayre-Orthez, Pascale Gadonna-Widehem, Jean-Yves Thébaudin, Marie Bodinier, Colette Larré
Wheat allergy is an IgE-mediated disorder. Polyphenols, which are known to interact with certain proteins, could be used to reduce allergic reactions. This study screened several polyphenol sources for their ability to interact with gliadins, mask epitopes, and affect basophil degranulation. Polyphenol extracts from artichoke leaves, cranberries, apples, and green tea leaves were examined. Of these extracts, the first three formed insoluble complexes with gliadins. Only the cranberry and apple extracts masked epitopes in dot blot assays using anti-gliadin IgG and IgE antibodies from patients with wheat allergies...
March 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28188172/t-cell-repertoires-in-refractory-coeliac-disease
#17
Julia Ritter, Karin Zimmermann, Korinna Jöhrens, Stefanie Mende, Anke Seegebarth, Britta Siegmund, Steffen Hennig, Kremena Todorova, Andreas Rosenwald, Severin Daum, Michael Hummel, Michael Schumann
OBJECTIVE: Refractory coeliac disease (RCD) is a potentially hazardous complication of coeliac disease (CD). In contrast to RCD type I, RCD type II is a precursor entity of enteropathy-associated T-cell lymphoma (EATL), which is associated with clonally expanding T-cells that are also found in the sequentially developing EATL. Using high-throughput sequencing (HTS), we aimed to establish the small-intestinal T-cell repertoire (TCR) in CD and RCD to unravel the role of distinct T-cell clonotypes in RCD pathogenesis...
February 10, 2017: Gut
https://www.readbyqxmd.com/read/28182308/mr-enterography-in-nonresponsive-adult-celiac-disease-correlation-with-endoscopic-pathologic-serologic-and-genetic-features
#18
Amir Reza Radmard, Amir Pejman Hashemi Taheri, Elham Salehian Nik, Soheil Kooraki, Shadi Kolahdoozan, Babak Mirminachi, Masoud Sotoudeh, Golnaz Ekhlasi, Reza Malekzadeh, Bijan Shahbazkhani
PURPOSE: To assess small bowel abnormalities on magnetic resonance enterography (MRE) in adult patients with nonresponsive celiac disease (CD) and investigate their associations with endoscopic, histopathologic, serologic, and genetic features. MATERIALS AND METHODS: This prospective study was carried out between September 2012 and August 2013. After approval by the Ethics Committee of our institution, informed consent was acquired from all participants. Forty consecutive patients with nonresponsive CD, aged 17-76 years, underwent MRE using a 1...
February 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28169607/the-gluten-free-diet-can-oats-and-wheat-starch-be-part-of-it
#19
J Rainer Poley
Objective and Conclusion: Uncertainty still exists about the use of oats and wheat starch as part of a gluten-free diet in patients with celiac disease (CD). This review should help to clarify the issues at hand. Whereas uncontaminated (from gluten/gliadin) oats and oats from cultivars not containing celiac-activating sequences of proline and glutamine can be used without risk of intestinal damage, wheat starch should not be used, unless it is free of gluten-that is, deglutinized-because even small amounts of gluten over time are able to induce small intestinal mucosal damage...
January 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28161854/diagnostic-yield-of-isolated-deamidated-gliadin-peptide-antibody-elevation-for-celiac-disease
#20
Nicholas A Hoerter, Sarah E Shannahan, Jorge Suarez, Suzanne K Lewis, Peter H R Green, Daniel A Leffler, Benjamin Lebwohl
BACKGROUND: Serologic testing for celiac disease includes tissue transglutaminase and endomysial antibodies. In addition to these tools, assays for deamidated gliadin peptide antibodies have been shown to have sensitivity and specificity that are comparable to tissue transglutaminase testing, and are increasingly being used for celiac disease testing. AIMS: The goal of this study is to evaluate the utility of deamidated gliadin peptide (DGP) testing in the setting of a negative tissue transglutaminase (TTG) IgA test...
February 4, 2017: Digestive Diseases and Sciences
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