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https://www.readbyqxmd.com/read/28811347/tifa-signaling-in-gastric-epithelial-cells-initiates-the-cag-type-4-secretion-system-dependent-innate-immune-response-to-helicobacter-pylori-infection
#1
Alevtina Gall, Ryan G Gaudet, Scott D Gray-Owen, Nina R Salama
Helicobacter pylori is a bacterial pathogen that colonizes the human stomach, causing inflammation which, in some cases, leads to gastric ulcers and cancer. The clinical outcome of infection depends on a complex interplay of bacterial, host genetic, and environmental factors. Although H. pylori is recognized by both the innate and adaptive immune systems, this rarely results in bacterial clearance. Gastric epithelial cells are the first line of defense against H. pylori and alert the immune system to bacterial presence...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28810728/is-there-a-link-between-clinical-manifestation-of-gastric-anisakiasis-and-helicobacter-pylori-infection
#2
Yuto Shimamura, Hirokazu Honda, Katsuyuki Fukuda
No abstract text is available yet for this article.
August 16, 2017: Clinical Endoscopy
https://www.readbyqxmd.com/read/28810614/evolution-of-correlation-between-helicobacter-pylori-infection-and-autoimmune-liver-disease
#3
Xin-Guo Peng, Yu-Yuan Li, Hui-Ting Chen, Yan Zhou, Jian-Guo Ma, Hong-Min Yin
The present study was planned to evaluate correlation between Helicobacter pylori (HP) infection and autoimmune liver disease (AILD). A total of 60 patients diagnosed with AILD in Affiliated Hospital of Binzhou Medical College were continuously enrolled in the present study. HP infection was detected by 13C-urea breath test. The levels of anti-myeloperoxidase were tested by ELISA. The positive rate of anti-nuclear antibody (ANA), anti-mitochondrial antibody (AMA), anti-smooth muscle antibody (SMA) and anti-neutrophil cytoplasm antibody (ANCA) were tested by indirect immunofluorescence...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809946/structure-function-analyses-of-metal-binding-sites-of-hypa-reveal-residues-important-for-hydrogenase-maturation-in-helicobacter-pylori
#4
Faith C Blum, Heidi Q Hu, Stephanie L Servetas, Stéphane L Benoit, Robert J Maier, Michael J Maroney, D Scott Merrell
The nickel-containing enzymes of Helicobacter pylori, urease and hydrogenase, are essential for efficient colonization in the human stomach. The insertion of nickel into urease and hydrogenase is mediated by the accessory protein HypA. HypA contains an N-terminal nickel-binding site and a dynamic structural zinc-binding site. The coordination of nickel and zinc within HypA is known to be critical for urease maturation and activity. Herein, we test the hydrogenase activity of a panel of H. pylori mutant strains containing point mutations within the nickel- and zinc-binding sites...
2017: PloS One
https://www.readbyqxmd.com/read/28808376/isolation-of-abscisic-acid-from-korean-acacia-honey-with-anti-helicobacter-pylori-activity
#5
SeGun Kim, InPyo Hong, SoonOk Woo, HyeRi Jang, SokCheon Pak, SangMi Han
BACKGROUND: Helicobacter pylori (H. pylori) is linked to the development of the majority of peptic ulcers and some types of gastric cancers, and its antibiotic resistance is currently found worldwide. OBJECTIVE: This study is aimed at evaluating the anti-H. pylori activity of Korean acacia honey and isolating the related active components using organic solvents. MATERIAL AND METHODS: The crude acacia honey was extracted with n-hexane, dichloromethane, ethyl acetate (EtOAc), and n-butanol...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28808292/binding-of-the-helicobacter-pylori-oipa-causes-apoptosis-of-host-cells-via-modulation-of-bax-bcl-2-levels
#6
Omid Teymournejad, Ashraf Mohabati Mobarez, Zuhair Mohammad Hassan, Amin Talebi Bezmin Abadi
The H. pylori outer inflammatory protein A (OipA) is an outer membrane protein that contributes to gastric inflammation. OipA is believed to affect intra-cellular signalling and modulate the host signalling pathways. The aim of the current study was to clarify the role of OipA in H. pylori pathogenesis and its effect on host cell signalling pathways. To this end, the oipA gene was isolated and inserted into cloning and expression vectors. The recombinant plasmid was transferred into an expression host to produce OipA, which was subsequently purified by affinity chromatography and used for antibody production...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807915/both-14-day-hybrid-and-bismuth-quadruple-therapies-cure-most-patients-with-helicobacter-pylori-infection-in-populations-with-moderate-antibiotic-resistance-a-randomized-controlled-trial
#7
Feng-Woei Tsay, Deng-Chyang Wu, Hsien-Chung Yu, Sung-Shuo Kao, Kung-Hung Lin, Jin-Shiung Cheng, Huay-Min Wang, Wen-Chi Chen, Wei-Chih Sun, Kuo-Wang Tsai, Ping-I Hsu
BACKGROUND & AIM: Hybrid therapy is a novel two-step treatment achieving a high eradication rate for H. pylori infection. Currently, whether this new therapy achieves a higher eradication rate than bismuth quadruple therapy remains an unanswered question. The aim of this prospective, randomized, comparive study was to investigate the efficacies of 14-day hybrid therapy and bismuth quadruple therapy in the treatment of H. pylori infection.METHODS: From July 2013 to June 2015, eligible H. pylori-infected subjects were randomly assigned to receive either 14-day bismuth quadruple therapy (pantoprazole, bismuth subcitrate, tetracycline, and metronidazole for 14 days) or 14-day hybrid therapy (a 7-day dual therapy with pantoprazole plus amoxicillin, followed by a 7-day quadraple therapy with pantoprazole plus amoxicillin, clarithromycin and metronidazole)...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28806959/second-line-therapy-for-helicobacter-pylori-eradication-causing-antibiotic-associated-hemorrhagic-colitis
#8
Kazuyuki Tanaka, Mikihiro Fujiya, Aki Sakatani, Shugo Fujibayashi, Yoshiki Nomura, Nobuhiro Ueno, Shin Kashima, Takuma Goto, Junpei Sasajima, Kentaro Moriichi, Toshikatsu Okumura
OBJECTIVE: Helicobacter pylori (H. pylori) eradication rarely develops into antibiotic-associated hemorrhagic colitis (AAHC), in which the etiology of colitis remains unclear. We herein report a rare case of AAHC caused by second-line therapy for H. pylori eradication. RESULTS: A 65-year-old female was administered second-line therapy for H. pylori composed of 1500 mg of amoxicillin, 500 mg of metronidazole and 40 mg of vonoprazan for 7 days because of first-line therapy failure...
August 14, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28806270/new-clinical-paradigms-for-treating-and-preventing-antiplatelet-gastrointestinal-bleeding
#9
Neena S Abraham
PURPOSE OF REVIEW: To quantify antiplatelet-related gastrointestinal bleeding (GIB), characterize patients at greatest risk and summarize risk-management strategies emphasizing evolving knowledge in acute management of antiplatelet-related bleeding. RECENT FINDINGS: New paradigms for acute management of antiplatelet-related GIB exist in the domains of resuscitation and the transfusion of blood products, strategic use of proton pump therapy and identification and eradication of Helicobacter pylori...
August 12, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/28805287/nongenetically-modified-lactococcus-lactis-adjuvanted-vaccination-enhanced-innate-immunity-against-helicobacter-pylori
#10
Wei Liu, Zhoulin Tan, Hai Liu, Zhiqin Zeng, Shuanghui Luo, Huimin Yang, Lufeng Zheng, Tao Xi, Yingying Xing
BACKGROUND: Gram-positive enhancer matrix particles (GEM) produced by Lactococcus lactis can enhance vaccine-induced immune response. However, the mechanism under which this adjuvant mounts the efficacy of orally administered vaccines remains unexplored. MATERIALS AND METHODS: We used a prophylactic mice model to investigate the mechanism of GEM-adjuvanted vaccination. Helicobacter pylori urease-specific antibody response was monitored and detected in murine serum by ELISA...
August 14, 2017: Helicobacter
https://www.readbyqxmd.com/read/28803254/helicobacter-pylori-cytotoxin-associated-gene-a-impairs-the-filtration-barrier-function-of-podocytes-via-p38-mapk-signaling-pathway
#11
Man Yang, Ling Wang, Li-Jie Gu, Wei-Jie Yuan
Helicobacter pylori (Hp) specific antigens were found deposited in the glomeruli in some kidney diseases. However, the underlying molecular mechanisms remain to be elucidated. The aim of this study was to investigate the effect of cytotoxin associated gene A protein (CagA), a key virulence factor of Hp, on mouse podocytes. Cells were cultured and treated with recombinant CagA protein. The expression of the tight junction protein ZO-1 and p38 MAPK signaling pathway activation were measured with real-time RT-PCR and western blotting...
August 12, 2017: Acta Biochimica Polonica
https://www.readbyqxmd.com/read/28802077/helicobacter-pylori-and-its-secreted-immunomodulator-vaca-protect-against-anaphylaxis-in-experimental-models-of-food-allergy
#12
Andreas Kyburz, Sabine Urban, Aleksandra Altobelli, Stefan Floess, Jochen Huehn, Timothy L Cover, Anne Müller
BACKGROUND: Food allergy is an increasingly common health problem in Western populations. Epidemiological studies have suggested both positive and negative associations between food allergy and infection with the gastric bacterium Helicobacter pylori. OBJECTIVE: The objective of this work was to investigate whether experimental infection with H. pylori, or prophylactic treatment with H. pylori-derived immunomodulatory molecules, affects the onset and severity of food allergy, either positively or negatively...
August 12, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28801580/immune-responses-against-helicobacter-pylori-specific-antigens-differentiate-relapsing-remitting-from-secondary-progressive-multiple-sclerosis
#13
Georgios Efthymiou, Efthymios Dardiotis, Christos Liaskos, Emmanouela Marou, Vana Tsimourtou, Eirini I Rigopoulou, Thomas Scheper, Alexandros Daponte, Wolfgang Meyer, Lazaros I Sakkas, Georgios Hadjigeorgiou, Dimitrios P Bogdanos
To assess whether Helicobacter pylori (Hp) antibody (ab) reactivity against individual Hp antigens is pathogenetically relevant to multiple sclerosis (MS), we systematically investigated prevalence and clinical significance of abs against 14 immunodominant and subdominant Hp antigens by ELISA and immunoblotting in 139 consecutive MS patients with relapsing-remitting (RRMS, n = 102) or secondary progressive (SPMS, n = 37). Sera from 39 patients with Parkinson's disease (PD), 21 with Alzheimer's disease (ALZ) and 68 healthy controls (HCs), were also tested...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801429/multicentric-randomised-study-of-helicobacter-pylori-eradication-and-pepsinogen-testing-for-prevention-of-gastric-cancer-mortality-the-gistar-study
#14
Marcis Leja, Jin Young Park, Raul Murillo, Inta Liepniece-Karele, Sergejs Isajevs, Ilze Kikuste, Dace Rudzite, Petra Krike, Sergei Parshutin, Inese Polaka, Arnis Kirsners, Daiga Santare, Valdis Folkmanis, Ilva Daugule, Martyn Plummer, Rolando Herrero
INTRODUCTION: Population-based eradication of Helicobacter pylori has been suggested to be cost-effective and is recommended by international guidelines. However, the potential adverse effects of widespread antibiotic use that this would entail have not been sufficiently studied. An alternative way to decrease gastric cancer mortality is by non-invasive search for precancerous lesions, in particular gastric atrophy; pepsinogen tests are the best currently available alternative. The primary objective of GISTAR is to determine whether H pylori eradication combined with pepsinogen testing reduces mortality from gastric cancer among 40-64-year-old individuals...
August 11, 2017: BMJ Open
https://www.readbyqxmd.com/read/28800560/molecular-basis-for-the-functions-of-a-bacterial-muts2-in-dna-repair-and-recombination
#15
Ge Wang, Robert J Maier
Bacterial MutS2 proteins, consisting of functional domains for ATPase, DNA-binding, and nuclease activities, play roles in DNA recombination and repair. Here we observe a mechanism for generating MutS2 expression diversity in the human pathogen Helicobacter pylori, and identify a unique MutS2 domain responsible for specific DNA-binding. H. pylori strains differ in mutS2 expression due to variations in the DNA upstream sequence containing short sequence repeats. Based on Western blots, mutS2 in some strains appears to be co-translated with the upstream gene, but in other strains (e...
July 19, 2017: DNA Repair
https://www.readbyqxmd.com/read/28799687/upfront-immunohistochemistry-improves-specificity-of-helicobacter-pylori-diagnosis-a-french-pathology-laboratory-point-of-view
#16
Florent Ginestet, Briac Guibourg, Laurent Doucet, Jérémie Théreaux, Michel Robaszkiewicz, Pascale Marcorelles, Arnaud Uguen
BACKGROUND: There is no consensus about the histopathologic methods to detect Helicobacter pylori in gastric biopsies to date. We aimed to question about the value of upfront anti-H. pylori immunohistochemistry in this field. MATERIAL AND METHODS: We led a retrospective study about the rate of H. pylori-positive gastric biopsies before and after the implementation of upfront immunohistochemistry, the inter-rater and intermethods agreements in H. pylori identification about Hematoxylin-Eosin Saffron (HES), Giemsa, and immunohistochemistry stains and the histopathologic features associated with low amounts of H...
August 11, 2017: Helicobacter
https://www.readbyqxmd.com/read/28799681/genomic-and-clinical-evidence-uncovers-the-enterohepatic-species-helicobacter-valdiviensis-as-a-potential-human-intestinal-pathogen
#17
Pablo Fresia, Ronald Jara, Rafael Sierra, Ignacio Ferrés, Gonzalo Greif, Gregorio Iraola, Luis Collado
BACKGROUND: Helicobacter valdiviensis is a recently described enterohepatic species isolated from wild bird's fecal samples. Currently, its pathogenic potential and clinical significance are unknown mainly due to the lack of whole-genome sequences to compare with other helicobacters and the absence of specific screenings to determine its prevalence in humans. MATERIALS AND METHODS: The species type strain (WBE14(T) ) was whole-genome-sequenced, and comparative analyses were carried out including the genomes from other Helicobacter species to determine the exact phylogenetic position of H...
August 11, 2017: Helicobacter
https://www.readbyqxmd.com/read/28799258/helicobacter-pylori-infection-and-serum-level-of-pepsinogen-are-associated-with-the-risk-of-metachronous-gastric-neoplasm-after-endoscopic-resection
#18
Y Kwon, S Jeon, S Nam, I Shin
BACKGROUND: Patients who have undergone endoscopic resection of early gastric cancers (EGCs) are at risk for metachronous gastric neoplasm. AIM: To determine whether serum level of pepsinogen (PG), a marker of gastric atrophy, can determine which patients who have undergone endoscopic submucosal dissection for EGC are at risk for metachronous gastric neoplasm. We also investigated the effects of Helicobacter pylori eradication on metachronous gastric neoplasm incidence...
August 11, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28798312/the-hypothesis-that-helicobacter-pylori-predisposes-to-alzheimer-s-disease-is-biologically-plausible
#19
Contaldi Felice, Capuano Federico, Fulgione Andrea, Aiese Cigliano Riccardo, Sanseverino Walter, Iannelli Domenico, Medaglia Chiara, Capparelli Rosanna
There is epidemiological evidence that H. pylori might predispose to Alzheimer's disease. To understand the cellular processes potentially linking such unrelated events, we incubated the human gastric cells MNK-28 with the H. pylori peptide Hp(2-20). We then monitored the activated genes by global gene expression. The peptide modulated 77 genes, of which 65 are listed in the AlzBase database and include the hallmarks of Alzheimer's disease: APP, APOE, PSEN1, and PSEN2. A large fraction of modulated genes (30 out of 77) belong to the inflammation pathway...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798286/the-characteristics-and-prognosis-of-diffuse-type-early-gastric-cancer-diagnosed-during-health-check-ups
#20
Ji Young Lee, Eun Jeong Gong, Eun Ju Chung, Hye Won Park, Suh Eun Bae, Eun Hee Kim, Jaeil Kim, Yoon Suh Do, Tae Hyup Kim, Hye-Sook Chang, Ho June Song, Jaewon Choe, Hwoon-Yong Jung
Background/Aims: Because of the poor prognosis of diffuse-type gastric cancer, early detection is important. We investigated the clinical characteristics and prognosis of diffuse-type early gastric cancer (EGC) diagnosed in subjects during health check-ups. Methods: Among 121,111 subjects who underwent gastroscopy during a routine health check-up, we identified 282 patients with 286 EGC lesions and reviewed their clinical and tumor-specific parameters. Results: Patients with diffuse-type EGC were younger, and 48...
August 14, 2017: Gut and Liver
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