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Transglutaminase 2

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https://www.readbyqxmd.com/read/28079608/mortality-and-differential-diagnoses-of-villous-atrophy-without-coeliac-antibodies
#1
Annalisa Schiepatti, Federico Biagi, Giacomo Fraternale, Claudia Vattiato, Davide Balduzzi, Simona Agazzi, Claudia Alpini, Catherine Klersy, Gino R Corazza
OBJECTIVE: Villous atrophy (VA) of the small bowel is mainly related to coeliac disease (CD), whose diagnosis is made on the basis of positive endomysial/tissue transglutaminase antibodies while on a gluten-containing diet in the vast majority of patients. However, VA can also occur in other conditions whose epidemiology is little known. Our aim was to study the epidemiology and clinical features of these rare enteropathies. PATIENTS AND METHODS: Clinical and laboratory data of all the patients with VA directly diagnosed in our centre in the last 15 years were collected and statistically analysed...
January 11, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28065858/role-of-transglutaminase-2-in-pac1-receptor-mediated-protection-against-hypoxia-induced-cell-death-and-neurite-outgrowth-in-differentiating-n2a-neuroblastoma-cells
#2
Alanood S Algarni, Alan J Hargreaves, John M Dickenson
The PAC1 receptor and tissue transglutaminase (TG2) play important roles in neurite outgrowth and modulation of neuronal cell survival. In this study, we investigated the regulation of TG2 activity by the PAC1 receptor in retinoic acid-induced differentiating N2a neuroblastoma cells. TG2 transamidase activity was determined using an amine incorporation and a peptide cross linking assay. In situ TG2 activity was assessed by visualising the incorporation of biotin-X-cadaverine using confocal microscopy. TG2 phosphorylation was monitored via immunoprecipitation and Western blotting...
January 5, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28062361/redox-signaling-in-the-gastrointestinal-tract
#3
REVIEW
Salvador Pérez, Raquel Taléns-Visconti, Sergio Rius-Pérez, Isabela Finamor, Juan Sastre
Redox signaling regulates physiological self-renewal, proliferation, migration and differentiation in gastrointestinal epithelium by modulating Wnt/β-catenin and Notch signaling pathways mainly through NADPH oxidases (NOXs). In the intestine, intracellular and extracellular thiol redox status modulates the proliferative potential of epithelial cells. Furthermore, commensal bacteria contribute to intestine epithelial homeostasis through NOX1- and dual oxidase 2-derived reactive oxygen species (ROS). The loss of redox homeostasis is involved in the pathogenesis and development of a wide diversity of gastrointestinal disorders, such as Barrett's esophagus, esophageal adenocarcinoma, peptic ulcer, gastric cancer, ischemic intestinal injury, celiac disease, inflammatory bowel disease and colorectal cancer...
January 3, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28056186/tampering-with-cancer-chemoresistance-by-targeting-the-tgm2-il6-autophagy-regulatory-network
#4
Han Zhang, Nami McCarty
Macroautophagy/autophagy is a well-established process involved in maintaining cellular homeostasis, but its role in cancer is complex and even controversial. Many studies have reported a correlative relationship between increased autophagy and evolving cancer cells under stress conditions such as nutrient or oxygen deprivation; however, there has been a lack of a plausible mechanistic link to properly target the autophagy process in the context of this microenvironment. We recently unveiled a positive regulatory loop involving TGM2 (transglutaminase 2)-NFKB/NF-κB signaling, IL6 and autophagy in cancer using mantle cell lymphoma (MCL) as a model system...
January 5, 2017: Autophagy
https://www.readbyqxmd.com/read/28052882/ethnic-differences-in-coeliac-disease-autoimmunity-in-childhood-the-generation-r-study
#5
Michelle A E Jansen, Sytske A Beth, Diana van den Heuvel, Jessica C Kiefte-de Jong, Hein Raat, Vincent W V Jaddoe, Menno C van Zelm, Henriette A Moll
OBJECTIVE: The aim was to identify whether ethnic differences in coeliac disease autoimmunity (CDA) in children at 6 years of age exist, and when present, to evaluate how these differences may be explained by sociodemographic and environmental factors. DESIGN: This study was embedded within a multi-ethnic population-based prospective cohort study. SETTING AND PATIENTS: 4442 six-year-old children born between 2002 and 2006 were included. Information on ethnicity, environmental and lifestyle characteristics was assessed by questionnaires...
January 4, 2017: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/28035551/agy-a-novel-egg-yolk-derived-anti-gliadin-antibody-is-safe-for-patients-with-celiac-disease
#6
Dory A Sample, Hoon H Sunwoo, Hien Q Huynh, Heather L Rylance, Cheri L Robert, Bi-Wen Xu, Sung H Kang, Naiyana Gujral, Levinus A Dieleman
BACKGROUND: Celiac disease (CD) is a gluten-triggered autoimmune disorder of the small intestine. A lifelong gluten-free diet (GFD) is the only approved treatment; however, strict adherence is difficult and many suffer from inadvertent gluten exposure. Oral egg yolk anti-gliadin antibody (AGY) is a novel treatment to neutralize gluten and may improve the efficacy of the GFD. AIMS: To determine the safety, tolerability, and potential efficacy of AGY in patients with CD...
December 29, 2016: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28008283/validation-of-celiac-disease-diagnoses-recorded-in-the-danish-national-patient-register-using-duodenal-biopsies-celiac-disease-specific-antibodies-and-human-leukocyte-antigen-genotypes
#7
Stine Dydensborg Sander, Ketil Størdal, Tine Plato Hansen, Anne-Marie Nybo Andersen, Joseph A Murray, Søren Thue Lillevang, Steffen Husby
PURPOSE: The purpose of this study was to validate the celiac disease diagnoses recorded in the Danish National Patient Register. To validate the diagnoses, we used information on duodenal biopsies from a national register of pathology reports (the Patobank) and information on celiac disease-specific antibodies and human leukocyte antigen (HLA) genotypes obtained from patient medical records. PATIENTS AND METHODS: We included all the children who were born from 1995 to 2012 and who were registered as having celiac disease in the Danish National Patient Register...
2016: Clinical Epidemiology
https://www.readbyqxmd.com/read/28003361/thioredoxin-1-selectively-activates-transglutaminase-2-in-the-extracellular-matrix-of-the-small-intestine-implications-for-celiac-disease
#8
Nicholas M Plugis, Brad A Palanski, Chih-Hisang Weng, Megan Albertelli, Chaitan Khosla
Transglutaminase 2 (TG2) catalyzes transamidation or deamidation of its substrates and is ordinarily maintained in a catalytically inactive state in the intestine and other organs. Aberrant TG2 activity is thought to play a role in celiac disease, suggesting that a better understanding of TG2 regulation could help to elucidate the mechanistic basis of this malady. Structural and biochemical analysis has led to the hypothesis that extracellular TG2 activation involves reduction of an allosteric disulfide bond by thioredoxin-1 (TRX), but cellular and in vivo evidence for this proposal is lacking...
December 21, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28002389/transglutaminase-2-inhibitor-kcc009-induces-p53-independent-radiosensitization-in-lung-adenocarcinoma-cells
#9
Sheng Huaying, Yao Dong, Zhu Chihong, Qian Xiaoqian, Wan Danying, Feng Jianguo
BACKGROUND The expression of transglutaminase 2 (TG2) is correlated to DNA damage repair and apoptosis through the p53 pathway. The present study aimed to investigate the potential radiosensitization effect and possible mechanisms of the TG2 inhibitor KCC009 in lung cancer in vitro. MATERIAL AND METHODS A single hit multi-target model was used to plot survival curves and to calculate the sensitizing enhancement ratios in lung cancer wild-type or mutant p53 of H1299 cells. We performed analyses for changes of cell cycling and apoptotic responses of cells; Western blot analysis and real-time SYBR Green PCR assay were used to determine the changes of mRNA/protein expressions; ELISA assay was used for examination of cytochrome c release in cytoplasm...
December 21, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27979583/abdominal-pain-associated-functional-gastrointestinal-disorder-prevalence-in-children-and-adolescents-with-celiac-disease-on-gluten-free-diet-a-multinational-study
#10
Miguel Saps, Naire Sansotta, Sean Bingham, Giuseppe Magazzu, Caterina Grosso, Simone Romano, Cenk Pusatcioglu, Stefano Guandalini
OBJECTIVE: To test the hypothesis that children with celiac disease (CD) on gluten-free diet are at increased risk of abdominal pain (AP) associated-functional gastrointestinal disorders (FGIDs). STUDY DESIGN: This was a multinational cross-sectional study performed from 2014 to 2015. Patients 4-18 years of age with CD on gluten-free diet for longer than 6 months were recruited from pediatric CD clinics in US and Italy. Control groups included siblings of children with CD (with normal tissue transglutaminase levels) and unrelated controls...
December 13, 2016: Journal of Pediatrics
https://www.readbyqxmd.com/read/27966639/microwave-assisted-cross-linking-of-milk-proteins-induced-by-microbial-transglutaminase
#11
Chun-Chi Chen, Jung-Feng Hsieh
We investigated the combined effects of microbial transglutaminase (MTGase, 7.0 units/mL) and microwave irradiation (MI) on the polymerization of milk proteins at 30 °C for 3 h. The addition of MTGase caused the milk proteins to become polymerized, which resulted in the formation of components with a higher molecular-weight (>130 kDa). SDS-PAGE analysis revealed reductions in the protein content of β-lactoglobulin (β-LG), αS-casein (αS-CN), κ-casein (κ-CN) and β-casein (β-CN) to 50.4 ± 2...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27957296/correlation-between-cut-off-level-of-tissue-transglutaminase-antibody-and-marsh-classification
#12
Azita Ganji, Abbas Esmaeilzadeh, Ali Bahari, Kamran Ghafarzadegan, Mehdi Afzal Aghayee, Homan Mosanen Mozafari, Abdolrasol Hayatbakhsh, Vahid Ghavami Ghanbarabadi, Behdad Ravarian, Leili Rahimi
: BACKGROUND Duodenal biopsy is required for diagnosis of celiac disease in adults, although some studies have suggested adequate accuracy of serology alone. OBJECTIVE: We aimed to assess the correlation between anti-tissue transglutaminase (tTG) titer and pathological findings and to define the specific level of tTG for predicting celiac disease in adults without the need for biopsy sampling. METHODS This descriptive study was done on 299 participants. The tTG titer and pathological findings of duodenal biopsy samples were used for this study...
October 2016: Middle East Journal of Digestive Diseases
https://www.readbyqxmd.com/read/27957294/adult-celiac-disease-patients-are-shorter-compared-with-their-peers-in-the-general-population
#13
Abbas Esmaeilzadeh, Azita Ganji, Ladan Goshayeshi, Kamran Ghafarzadegan, Mehdi Afzal Aghayee, Homan Mosanen Mozafari, Hassan Saadatniya, Abdolrasol Hayatbakhs, Vahid Ghavami Ghanbarabadi
BACKGROUND Delay in diagnosis of celiac disease (CD) occurs frequently, although its consequences are mostly not known. One of the presented symptoms in pediatric patients with CD is the short stature. However, far too little attention has been paid to physical features including height of adult patients with CD. This study was undertaken to evaluate whether patients suffering from CD are shorter in comparison with the general population without CD. As well, we evaluated probable correlations between demographic and physical features, main complains, serum anti tTG level, and intestinal pathology damage between short (lower quartile) versus tall stature (upper quartile) patients with CD...
October 2016: Middle East Journal of Digestive Diseases
https://www.readbyqxmd.com/read/27941875/transamidase-site-targeted-agents-alter-the-conformation-of-the-transglutaminase-cancer-stem-cell-survival-protein-to-reduce-gtp-binding-activity-and-cancer-stem-cell-survival
#14
C Kerr, H Szmacinski, M L Fisher, B Nance, J R Lakowicz, A Akbar, J W Keillor, T Lok Wong, R Godoy-Ruiz, E A Toth, D J Weber, R L Eckert
Type 2 transglutaminase (TG2) is an important cancer stem cell survival protein that exists in open and closed conformations. The major intracellular form is the closed conformation that functions as a GTP-binding GTPase and is required for cancer stem cell survival. However, at a finite rate, TG2 transitions to an open conformation that exposes the transamidase catalytic site involved in protein-protein crosslinking. The activities are mutually exclusive, as the closed conformation has GTP binding/GTPase activity, and the open conformation transamidase activity...
December 12, 2016: Oncogene
https://www.readbyqxmd.com/read/27920816/concomitant-extraspinal-hyperostosis-and-osteoporosis-in-a-patient-with-congenital-ichthyosis
#15
Niloufar Torkamani, Pramit Phal, Ravi Savarirayan, Peter Simm, George Varigos, John Wark
Ichthyosiform dermatosis is a term referred to a group of disorders that have as their basis a disorder of keratinization (1). These conditions which are present at birth result in a generalized dry, scaly skin without any inflammation. There are several types of ichthyosis based on their clinical presentation and mode of inheritance. The most common types are: ichthyosis vulgaris, X-linked recessive ichthyosis, epidermolytic hyperkeratosis (bullous), lamellar ichthyosis and non-bullous ichthyosiform erythroderma...
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27916669/prevalence-and-morbidity-of-undiagnosed-celiac-disease-from-a-community-based-study
#16
Rok Seon Choung, Scott A Larson, Shahryar Khaleghi, Alberto Rubio-Tapia, Inna G Ovsyannikova, Katherine S King, Joseph J Larson, Brian D Lahr, Gregory A Poland, Michael J Camilleri, Joseph A Murray
BACKGROUND & AIMS: Little is known about the prevalence and burden of undiagnosed celiac disease in individuals younger than 50 years old. We determined the prevalence and morbidity of undiagnosed celiac disease in individuals younger than 50 years in a community. METHODS: We tested sera from 31,255 residents of Olmsted County, Minnesota (younger than 50 years old) without a prior diagnosis of celiac disease assay using an assay for immunoglobulin A (IgA) against tissue transglutaminase (tTG); in subjects with positive test results, celiac disease was confirmed using an assay for endomysial IgA...
December 1, 2016: Gastroenterology
https://www.readbyqxmd.com/read/27899316/inhibition-or-ablation-of-transglutaminase-2-impairs-astrocyte-migration
#17
Alina Monteagudo, Changyi Ji, Abdullah Akbar, Jeffrey W Keillor, Gail V W Johnson
Astrocytes play numerous complex roles that support and facilitate the function of neurons. Further, when there is an injury to the central nervous system (CNS) they can both facilitate or ameliorate functional recovery depending on the location and severity of the injury. When a CNS injury is relatively severe a glial scar is formed, which is primarily composed of astrocytes. The glial scar can be both beneficial, by limiting inflammation, and detrimental, by preventing neuronal projections, to functional recovery...
November 27, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27895976/microscopic-colitis-in-patients-with-mild-duodenal-damage-a-new-clinical-and-pathological-entity-lymphocytic-enterocolitis
#18
Gabriele Antonio Bonagura, Davide Giuseppe Ribaldone, Sharmila Fagoonee, Nicoletta Sapone, Gian Paolo Caviglia, Giorgio Maria Saracco, Marco Astegiano, Rinaldo Pellicano
AIM: To evaluate the potential association between mild duodenal damage and microscopic colitis (MC). METHODS: We retrospectively included 105 consecutive patients with type I Marsh-Oberhuber duodenal damage and negativity for immunoglobulin A anti-endomysium and anti-tissue transglutaminase. The following parameters were analyzed: Sex, age at execution of esophagogastroduodenoscopy, duodenal damage, and number of intraepithelial lymphocytes at biopsies, prevalence of Helicobacter pylori infection, age at execution of colonoscopy, macroscopic and microscopic features of colonoscopy, family history of gastrointestinal and autoimmune diseases, smoking habits, biochemical parameters of inflammation and autoimmunity, use of proton pump inhibitors or nonsteroidal anti-inflammatory drugs, adverse reactions to drugs or foods, pathologies known to be associated with celiac disease or MC, living on a gluten-free diet or on a gluten-low diet for at least 1 mo...
November 15, 2016: World Journal of Gastrointestinal Pathophysiology
https://www.readbyqxmd.com/read/27867394/association-of-tissue-transglutaminase-antibody-titer-with-duodenal-histological-changes-in-children-with-celiac-disease
#19
Hasan Hawamdeh, Basim Al-Zoubi, Yasameen Al Sharqi, Ayman Qasrawi, Yousef Abdelaziz, Maha Barbar
Celiac disease is usually diagnosed by demonstrating gluten enteropathy in small bowel biopsy. Celiac specific antibodies are used as an initial screening test. The goal of this study is to test the relationship of the anti-tTG titer and severity of histological changes in Jordanian children with celiac disease. Method. The medical records of 81 children who had elevated anti-tTG titer and had duodenal biopsies available were retrospectively reviewed. Result. Assessing the association of anti-tTG titer with duodenal histopathological changes, 94% of those with high anti-tTG titer (≥180 U/mL) had histological evidence of celiac disease...
2016: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/27864692/transglutaminase-2-is-involved-in-amyloid-beta1-42-induced-pro-inflammatory-activation-via-ap1-jnk-signalling-pathways-in-thp-1-monocytes
#20
Monica Currò, Chiara Gangemi, Maria Laura Giunta, Nadia Ferlazzo, Michele Navarra, Riccardo Ientile, Daniela Caccamo
Deposition of amyloid-beta (Aβ) peptides has been shown to induce the release of inflammatory factors by activated microglia and brain infiltrating monocytes/macrophages. Interestingly, the enzyme transglutaminase 2 (TG2) has been shown to play a key role in neuroinflammation and regulation of transcription factors involved in immunomodulation. In this study, we aimed to better elucidate the mechanisms underlying TG2 involvement in the pro-inflammatory signaling pathway activated by fibrillar Aβ1-42 in THP-1 monocytes...
November 18, 2016: Amino Acids
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