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Helicobacter pylori

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https://www.readbyqxmd.com/read/29342404/association-between-severity-of-liver-disease-frequency-of-helicobacter-pylori-infection-and-degree-of-gastric-lesion-in-egyptian-patients-with-hepatitis-b-virus-infection
#1
Amal A Mohamed, Amal A Elshimy, Abir O El Sadik, Elham Ezzat, Mona Nasar, Shereen S M Elshaer, Moataz M Sayed
The relationship between hepatitis B virus (HBV) infection, severity of liver disease, frequency of Helicobacter pylori infection, and degree of gastric lesions was not yet fully investigated in Egyptian patients. The present work was performed on 100 Egyptian patients with HBV from the National Hepatology and Tropical Medicine Institute and 70 healthy volunteers as control group. The participants were subjected to full medical history taking, clinical examination, and laboratory investigations. All patients were positive for HBV surface antigen (HBV sAg), HBV DNA, and negative for hepatitis C virus antibodies...
January 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29336317/association-between-helicobacter-pylori-infection-and-vulvar-lichen-sclerosus-a-clinical-comparative-study
#2
Stefano Basile, Sara Pinelli, Pierluigi Benedetti Panici, Roberto Angioli, Francesco Plotti, Diana Giannarelli, Roldano Fossati, Carlo Maria Rosati, Maria Giovanna Salerno
No abstract text is available yet for this article.
January 16, 2018: European Journal of Dermatology: EJD
https://www.readbyqxmd.com/read/29334503/family-history-of-autoimmune-diseases-and-risk-of-gastric-cancer-a-national-cohort-study
#3
Jianguang Ji, Jan Sundquist, Kristina Sundquist
A personal history of autoimmune diseases is associated with an increased incidence of gastric cancer, but whether they share familial susceptibility is still unknown. The contribution of shared environmental or genetic factors toward the observed familial aggregation has not been determined. We used a few Swedish registers, including the Swedish Multigeneration Register and the Cancer Register, to examine the familial risk of gastric cancer among individuals with a family history of a set of autoimmune diseases...
January 12, 2018: European Journal of Cancer Prevention
https://www.readbyqxmd.com/read/29333062/helicobacter-pylori-infection-and-esophageal-adenocarcinoma-a-review-and-a-personal-view
#4
REVIEW
Stergios A Polyzos, Christos Zeglinas, Fotini Artemaki, Michael Doulberis, Evangelos Kazakos, Panagiotis Katsinelos, Jannis Kountouras
Esophageal adenocarcinoma (EAC) is etiologically associated with gastroesophageal reflux disease (GERD). There is evidence to support the sequence GERD, Barrett's esophagus (BE), dysplasia, and finally EAC, with Helicobacter pylori (H. pylori) being implicated in each step to EAC. On the other side of this relation stands the hypothesis of the protective role of H. pylori against EAC. Based on this controversy, our aim was to review the literature, specifically original clinical studies and meta-analyses linking H...
January 2018: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
https://www.readbyqxmd.com/read/29330348/weak-epistasis-may-drive-adaptation-in-recombining-bacteria
#5
Brian J Arnold, Michael U Gutmann, Yonatan H Grad, Samuel K Sheppard, Jukka Corander, Marc Lipsitch, William P Hanage
The impact of epistasis on the evolution of multilocus traits depends on recombination. While sexually-reproducing eukaryotes recombine so frequently that epistasis between polymorphisms is not considered to play a large role in short-term adaptation, many bacteria also recombine, some to the degree that their populations are described as 'panmictic' or 'freely recombining'. However, whether this recombination is sufficient to limit the ability of selection to act on epistatic contributions to fitness is unknown...
January 12, 2018: Genetics
https://www.readbyqxmd.com/read/29329668/helicobacter-pylori-induces-direct-activation-of-the-lymphotoxin-beta-receptor-and-non-canonical-nuclear-factor-kappa-b-signaling
#6
Michael Hartmut Feige, Michael Vieth, Olga Sokolova, Christian Täger, Michael Naumann
The pathogen Helicobacter pylori, which infects half of the world's population, is a major risk factor for the development of gastric diseases including chronic gastritis and gastric cancer. Among H. pylori's virulence factors is the cytotoxin-associated gene pathogenicity island (cagPAI), which encodes for a type IV secretion system (T4SS). The T4SS induces fast canonical nuclear factor-kappa B (NF-κB) signaling, a major factor increasing inflammation, supressing apoptotic cell death and thereby promoting the development of neoplasia...
January 9, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29328350/helicobacter-pylori-dna-obtained-from-the-stomach-specimens-of-two-17th-century-korean-mummies
#7
Dong Hoon Shin, Chang Seok Oh, Jong Ha Hong, Hyejin Lee, Soong Deok Lee, Eunju Lee
Helicobacter pylori is a bacterium that grows in the stomach mucosal epithelium, and can induce gastric diseases. Although many studies on modern H. pylori genomes have been reported from all over the world, a comprehensive picture of H. pylori is still lacking. Therefore, there is a pressing need to obtain archaeological specimens and to subject the ancient DNA (aDNA) extracted therefrom to analysis. Considering the typically excellent state of preservation of Joseon mummies discovered in Korea, we thus tried to isolate ancient H...
January 12, 2018: Anthropologischer Anzeiger; Bericht über die Biologisch-anthropologische Literatur
https://www.readbyqxmd.com/read/29327820/gastroenterology-today-between-certainties-and-news-a-meeting-held-in-turin-on-may-27-2017
#8
Rinaldo Pellicano, Davide G Ribaldone, Marco Astegiano, Luca Dughera, Edda Battaglia, Anna Morgando, Arrigo Arrigoni, Mauro Spandre, Mario Grassini, Giorgio M Saracco, Francis Mégraud
This special article reports on two crucial issues discussed during a meeting. The first was the updated management of Helicobacter pylori infection. This was approached taking into account the recent European Guidelines, with a focus on novelties in treatment. In particular, considering the increasing H. pylori antibiotic resistance to clarithromycin, in countries with a high clarithromycin resistance rate the bismuth-containing quadruple therapies should be preferred. The new formulation, with bismuth, metronidazole, and tetracycline contained in a single capsule (three-in-one), has shown exciting results both in naive and in non-responder patients...
January 10, 2018: Minerva Gastroenterologica e Dietologica
https://www.readbyqxmd.com/read/29327819/helicobacter-pylori-infection-in-africa-2018-literature-update
#9
Stella I Smith, Abiodun Seriki, Roland Ndip, Rinaldo Pellicano
Helicobacter pylori (H. pylori) relationship with humans is believed to have originated in Africa and three African H. pylori populations have been identified: hpAfrica1, hpAfrica2 and hpNEAfrica. Actually, H. pylori infection is a ubiquitous infection in developing countries, particularly Africa. In this continent, the prevalence of H. pylori is higher and the bacterium is acquired at an early age compared to developed countries. In fact, while it affects over 50% of humans in developed countries its prevalence reaches 80% or more among adults in Africa...
January 10, 2018: Minerva Gastroenterologica e Dietologica
https://www.readbyqxmd.com/read/29327342/reduced-lysosomal-clearance-of-autophagosomes-promotes-survival-and-colonization-of-helicobacter-pylori
#10
Lin Zhang, Wei Hu, Chi H Cho, Francis K L Chan, Jun Yu, J Ross Fitzgerald, Cynthia K Y Cheung, Zhan G Xiao, Jing Shen, Long F Li, Ming X Li, Justin C Y Wu, Thomas K W Ling, Jason Y K Chan, Ko Ho, Gary Tse, Siew C Ng, Sidney Yu, Maggie H T Wang, Tony Gin, Hassan Ashktorab, Duane T Smoot, Sunny H Wong, Matthew T V Chan, William K K Wu
Evasion of autophagy is key for intracellular survival of bacteria in host cells, but its involvement in persistent infection by Helicobacter pylori, a bacterium identified to invade gastric epithelial cells, remains obscure. The aim of this study was to functionally characterize the role of autophagy in H. pylori infection. Autophagy was assayed in H. pylori-infected human gastric epithelium and the functional role of autophagy was determined via genetic or pharmacologic ablation of autophagy in mouse and cell line models of H...
January 12, 2018: Journal of Pathology
https://www.readbyqxmd.com/read/29327293/overexpression-of-spot-gene-in-coccoid-forms-of-clinical-helicobacter-pylori-isolates
#11
Farkhondeh Poursina, Jamshid Fagri, Nasrin Mirzaei, Hajieh Ghasemian Safaei
Helicobacter pylori (H. pylori) can convert to coccoid form in unfavorable conditions or as a result of antibiotic treatment. In order to adapt to harsh environments, H. pylori requires a stringent response which, encoded by the spoT gene, has a bifunctional enzyme possessing both (p)ppGpp synthetic and degrading activity. Our goal in this study was to compare spoT gene expression in spiral and induced coccoid forms of H. pylori with use of amoxicillin. First, clinical isolate coccoid forms were induced with amoxicillin; then, the viability test was analyzed by flow cytometer...
January 11, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29325864/infections-genetic-and-environmental-factors-in-pathogenesis-of-autoimmune-thyroid-diseases
#12
REVIEW
Sanjeev Kumar Shukla, Govind Singh, Shahzad Ahmad, Prabhat Pant
In Autoimmune disease a combination of infection, genetic and environmental factors causes an autoimmune response to the thyroid gland (characterized by lymphocytic infiltrations), thyroid stimulating hormone receptor (TSHR) and different thyroid antigens. Graves' and Hashimoto disease are autoimmune disorders with genetic predisposition. CD40 that stimulates the proliferation and differentiation of lymphocytes is an essential immunomodulatory component for follicular cells in the thyroid and the cell that present the antigen...
January 8, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29324718/screening-of-e-coli-%C3%AE-clamp-inhibitors-revealed-that-few-inhibit-helicobacter-pylori-more-effectively-structural-and-functional-characterization
#13
Preeti Pandey, Vijay Verma, Suman Kumar Dhar, Samudrala Gourinath
The characteristic of interaction with various enzymes and processivity-promoting nature during DNA replication makes β-clamp an important drug target. Helicobacter pylori (H. pylori) have several unique features in DNA replication machinery that makes it different from other microorganisms. To find out whether difference in DNA replication proteins behavior accounts for any difference in drug response when compared to E. coli, in the present study, we have tested E. coli β-clamp inhibitor molecules against H...
January 11, 2018: Antibiotics
https://www.readbyqxmd.com/read/29324238/immunization-with-recombinant-flid-confers-protection-against-helicobacter-pylori-infection-in-mice
#14
Amir Ghasemi, Nazanin Mohammad, Josef Mautner, Mehrnaz Taghipour Karsabet, Abolfazl Ardjmand, Rezvan Moniri
Nearly half of the world's population is infected with Helicobacter pylori. Clinical manifestations of this infection range from gastritis and peptic ulcers to gastric adenocarcinoma and lymphoma. Due to the emerging of antibiotic resistant strains and poor patient compliance of the antibiotic therapy, there is increasing interest in the development of a protective vaccine against H. pylori infection. The bacterial protein FliD forms a capping structure on the end of each flagellum which is critical to prevent depolymerization and structural degradation...
January 8, 2018: Molecular Immunology
https://www.readbyqxmd.com/read/29322413/isolation-of-mouse-primary-gastric-epithelial-cells-to-investigate-the-mechanisms-of-helicobacter-pylori-associated-disease
#15
Le Son Tran, Richard L Ferrero
The gastrointestinal epithelium provides the first line of defense against invading pathogens, among which Helicobacter pylori is linked to numerous gastric pathologies, including chronic gastritis and cancer. Primary gastric epithelial cells represent a useful model for the investigation of the underlying molecular and cellular mechanisms involved in these H. pylori associated diseases. In this chapter, we describe a method for the isolation of primary gastric epithelial cells from mice and detection of epithelial cell adhesion molecule (EpCAM) expression in the isolated cells...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29320492/metallochaperone-ureg-serves-as-a-new-target-for-design-of-urease-inhibitor-a-novel-strategy-for-development-of-antimicrobials
#16
Xinming Yang, Mohamad Koohi-Moghadam, Runming Wang, Yuen-Yan Chang, Patrick C Y Woo, Junwen Wang, Hongyan Li, Hongzhe Sun
Urease as a potential target of antimicrobial drugs has received considerable attention given its versatile roles in microbial infection. Development of effective urease inhibitors, however, is a significant challenge due to the deeply buried active site and highly specific substrate of a bacterial urease. Conventionally, urease inhibitors are designed by either targeting the active site or mimicking substrate of urease, which is not efficient. Up to now, only one effective inhibitor-acetohydroxamic acid (AHA)-is clinically available, but it has adverse side effects...
January 10, 2018: PLoS Biology
https://www.readbyqxmd.com/read/29319212/synergistic-glycosylation-as-key-to-the-chemical-synthesis-of-an-outer-core-octasaccharide-of-helicobacter-pylori
#17
Jian Yin, Xiaopeng Zou, Chunjun Qin, Claney L Pereira, Guangzong Tian, Jing Hu, Peter H Seeberger
Helicobacter pylori, a widespread gastric bacterial pathogen that infects 90% of the population in developing countries, causes chronic gastritis, peptic ulcers and gastric cancer. Battling H. pylori infection is a serious challenge due to the increased resistance to antibiotics and the lack of vaccines. The lipopolysaccharide covering the H. pylori cell-surface outer membrane is an attractive target for the development of a glycoconjugate vaccine. Here, we report a [3+5] convergent synthesis of an outer core octasaccharide of H...
January 10, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29319200/the-rise-and-fall-of-peptic-ulceration-a-disease-of-civilization
#18
REVIEW
Ian C Roberts-Thomson
Humans and Helicobacter pylori have evolved and adapted over tens of thousands of years. Yet peptic ulcer disease appeared to be rare prior to the 19th century. The prevalence of peptic ulcer disease increased between 1850 and 1900 and culminated in a cohort at high risk that was born at the end of the 19th century. This coincided with the provision of safe water and improvements in sanitation and personal hygiene. One hypothesis for the emergence of peptic ulcer disease focuses on the rate of development of atrophic gastritis induced by Helicobacter pylori...
January 10, 2018: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29317709/increased-abundance-of-clostridium-and-fusobacterium-in-gastric-microbiota-of-patients-with-gastric-cancer-in-taiwan
#19
Yung-Yu Hsieh, Shui-Yi Tung, Hung-Yu Pan, Chih-Wei Yen, Huang-Wei Xu, Ying-Jhen Lin, Yi-Fang Deng, Wan-Ting Hsu, Cheng-Shyong Wu, Chin Li
Helicobacter pylori is recognised as a main risk factor for gastric cancer. However, approximately half of the patients with gastritis are negative for H. pylori infection, and the abundance of H. pylori decreases in patients with cancer. In the current study, we profiled gastric epithelium-associated bacterial species in patients with gastritis, intestinal metaplasia, and gastric cancer to identify additional potential pathogenic bacteria. The overall composition of the microbiota was similar between the patients with gastritis and those with intestinal metaplasia...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29317648/nf-%C3%AE%C2%BAb-mir-223-3p-arid1a-axis-is-involved-in-helicobacter-pylori-caga-induced-gastric-carcinogenesis-and-progression
#20
Fenghua Yang, Yugang Xu, Chao Liu, Cunying Ma, Shuiyan Zou, Xia Xu, Jihui Jia, Zhifang Liu
Infection with Helicobacter pylori (H. pylori) and the resulting gastric inflammation is regarded as the strongest risk factor for gastric carcinogenesis and progression. NF-κB plays an important role in linking H. pylori-mediated inflammation to cancer. However, the underlying mechanisms are poorly understood. In this study, we find that H. pylori infection induces miR-223-3p expression in H. pylori CagA-dependent manner. NF-κB stimulates miR-223-3p expression via directly binding to the promoter of miR-223-3p and is required for H...
January 9, 2018: Cell Death & Disease
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