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Helicobacter pylori and gastric cancer

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https://www.readbyqxmd.com/read/29233672/time-latencies-of-helicobacter-pylori-eradication-after-peptic-ulcer-and-risk-of-recurrent-ulcer-ulcer-adverse-events-and-gastric-cancer-a-population-based-cohort-study
#1
Emma Sverdén, Nele Brusselaers, Karl Wahlin, Jesper Lagergren
BACKGROUND: Helicobacter pylori (H pylori) is associated with peptic ulcer disease and gastric cancer. AIM: To test how various lengths of delays in H pylori eradication therapy influence the risk of recurrent peptic ulcer, ulcer adverse events and gastric cancer. METHODS: This population-based nationwide Swedish cohort study included 29,032 patients receiving H pylori eradication therapy after peptic ulcer disease in 2005-2013. Pre-defined time intervals between date of peptic ulcer diagnosis and date of eradication therapy were analysed in relation to study outcomes...
December 9, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/29232943/effect-of-helicobacter-pylori-eradication-on-the-regression-of-gastric-polyps-in-national-cancer-screening-program
#2
Su Youn Nam, Bum Joon Park, Kum Hei Ryu, Ji Hyung Nam
Background/Aims: Western guidelines recommend Helicobacter pylori eradication in H. pylori-associated gastric polyps; however, there is no standard guideline in Korea. The aim of this study is to assess the effect of H. pylori eradication on the regression of gastric hyperplastic polyps in National Cancer Screening Cohort, representative of general population. Methods: Among participants in National Cancer Screening Program, subjects who had H. pylori positive gastric hyperplastic polyps less than 10 mm and underwent follow-up endoscopy and H...
December 14, 2017: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/29229727/high-salt-conditions-alter-transcription-of-helicobacter-pylori-genes-encoding-outer-membrane-proteins
#3
John T Loh, Amber C Beckett, Matthew B Scholz, Timothy L Cover
Helicobacter pylori infection and high dietary salt intake are risk factors for the development of gastric adenocarcinoma. One possible mechanism by which a high salt diet could influence gastric cancer risk is by modulating H. pylori gene expression. In this study, we utilized RNA-seq methodology to compare the transcriptional profiles of H. pylori grown in media containing different concentrations of sodium chloride. We identified 118 differentially expressed genes (65 upregulated and 53 downregulated in response to high salt conditions), including multiple members of 14 operons...
December 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29227536/microrna-222-3p-associated-with-helicobacter-pylori-targets-hipk2-to-promote-cell-proliferation-invasion-and-inhibits-apoptosis-in-gastric-cancer
#4
Xiaoyan Tan, Haiying Tang, Jian Bi, Na Li, Yujie Jia
Gastric cancer ranks as the second leading cause of malignancy-related death worldwide, and always diagnosed at advanced stage. MicroRNA-222-3p (miR-222-3p) is aberrantly upregulated in various malignant tumors including gastric cancer, but its role and underlying molecular mechanisms in gastric cancer remain largely unknown. Helicobacter pylori (H. pylori) infection acts as a trigger in the development of gastric cancer, and increasing evidence suggests that H. pylori affects microRNA expression. In this study, gastric cancer tissue samples were divided into H...
December 11, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29225710/novel-developments-in-the-pathogenesis-and-diagnosis-of-extranodal-marginal-zone-lymphoma
#5
REVIEW
Max I Schreuder, Michiel van den Brand, Konnie M Hebeda, Patricia J T A Groenen, J Han van Krieken, Blanca Scheijen
Extranodal marginal zone lymphoma (EMZL), mostly represented by mucosa-associated lymphoid tissue (MALT) type, also referred to as MALT lymphoma, is a clinically heterogeneous entity within the group of low-grade B cell lymphomas that arises in a wide range of different extranodal sites, including the stomach, lung, ocular adnexa, and skin. It represents the third most common non-Hodgkin lymphoma in the Western world, and the median age of occurrence is around 60 years. One characteristic aspect in a subset of EMZL detectable in about 25% of the cases is the presence of specific chromosomal translocations involving the genes MALT1 and BCL10, which lead to activation of the NF-κB signaling pathway...
December 2017: Journal of Hematopathology
https://www.readbyqxmd.com/read/29225256/gastric-adenocarcinoma-of-the-fundic-gland-type-after-endoscopic-therapy-for-metachronous-gastric-cancer-a-case-report
#6
Hitoshi Kino, Masakazu Nakano, Akira Kanamori, Tsunehiro Suzuki, Yoshihito Kaneko, Chieko Tsuchida, Kouhei Tsuchida, Keiichi Tominaga, Takako Sasai, Hidetsugu Yamagishi, Yasuo Imai, Hideyuki Hiraishi
A 78-year-old man underwent endoscopic submucosal dissection (ESD) for early gastric adenocarcinoma twice in 2009 and 2014. Between the procedures, he successfully completed Helicobacter pylori eradication therapy. In May 2015, upper endoscopy screening showed two elevated lesions on the gastric fundus, and en bloc resection by ESD was performed. We histopathologically diagnosed the patient to have gastric adenocarcinoma of the fundic gland type. In this case, the two lesions of gastric adenocarcinoma of the fundic gland type multifocally developed after ESD for metachronous gastric tubular adenocarcinoma...
December 8, 2017: Internal Medicine
https://www.readbyqxmd.com/read/29223485/preventive-effect-of-anti-vaca-egg-yolk-immunoglobulin-igy-on-helicobacter-pylori-infected-mice
#7
Kyung Sook Hong, Mi-Ran Ki, H M Arif Ullah, Eun-Joo Lee, Yong Deuk Kim, Myung-Jin Chung, Ahmed K Elfadl, Jin-Kyu Park, Kyu-Shik Jeong
BACKGROUND: Helicobacter pylori, a gram-negative bacterium, is the causative agent of gastric disorders and gastric cancer in the human stomach. Vacuolating cytotoxin A (VacA) is among the multi-effect protein toxins released by H. pylori that enables its persistence in the human stomach. METHODS: To evaluate the effect of anti-VacA egg yolk immunoglobulin (anti-VacA IgY) on H. pylori infection, a highly specific anti-VacA IgY was produced from egg yolks of hens immunized with a mixture of two purified recombinant VacAs...
December 6, 2017: Vaccine
https://www.readbyqxmd.com/read/29219812/helicobacter-pylori-resistance-in-the-netherlands-a-growing-problem
#8
R Ruiter, H F Wunderink, R A Veenendaal, L G Visser, M G J de Boer
Helicobacter pylori infection is clinically associated with dyspepsia, gastric and duodenal ulcers, and gastric cancer. Increasing antimicrobial resistance in H. pylori is a worldwide problem and failure of eradication with standard triple therapy (high-dose proton pump inhibition, amoxicillin and clarithromycin) is directly related to the presence of a resistant strain. Other treatment combinations have been investigated, but with inconsistent results. Based on a review of the recent literature in conjunction with an analysis of the regional resistance data, we address the increasing complexity of H...
November 2017: Netherlands Journal of Medicine
https://www.readbyqxmd.com/read/29216843/evaluation-of-the-visibility-of-early-gastric-cancer-using-linked-color-imaging-and-blue-laser-imaging
#9
Yoshikazu Yoshifuku, Yoji Sanomura, Shiro Oka, Mio Kurihara, Takeshi Mizumoto, Tomohiro Miwata, Yuji Urabe, Toru Hiyama, Shinji Tanaka, Kazuaki Chayama
BACKGROUND: Blue laser imaging (BLI) and linked color imaging (LCI) are the color enhancement features of the LASEREO endoscopic system, which provide a narrow band light observation function and expansion and reduction of the color information, respectively. METHODS: We examined 82 patients with early gastric cancer (EGC) diagnosed between April 2014 and August 2015. Five expert and 5 non-expert endoscopists retrospectively compared images obtained on non-magnifying BLI bright mode (BLI-BRT) and LCI with those obtained via conventional white light imaging (WLI)...
December 8, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/29210527/seroprevalence-of-helicobacter-pylori-in-hispanics-living-in-puerto-rico-a-population-based-study
#10
María González-Pons, Marievelisse Soto-Salgado, Javier Sevilla, Juan M Márquez-Lespier, Douglas Morgan, Cynthia M Pérez, Marcia Cruz-Correa
BACKGROUND: Helicobacter pylori is an important etiologic factor for peptic ulcers and gastric cancer, one of the top ten leading causes of cancer death in Puerto Rico. However, the prevalence of H. pylori infections in this population was previously unknown. The aim of this study was to examine the seroprevalence of H. pylori and its associated risk factors in Puerto Rico. MATERIALS AND METHODS: A cross-sectional study was designed using an existing population-based biorepository...
December 6, 2017: Helicobacter
https://www.readbyqxmd.com/read/29209681/is-there-a-low-prevalence-of-helicobacter-pylori-infection-in-jordanian-patients-with-gastric-cancer
#11
Rinaldo Pellicano
[No Abstract Available].
December 2017: Saudi Medical Journal
https://www.readbyqxmd.com/read/29202699/comparison-of-lipopolysaccharides-composition-of-two-different-strains-of-helicobacter-pylori
#12
Kristy Leker, Ivonne Lozano-Pope, Keya Bandyopadhyay, Biswa P Choudhury, Marygorret Obonyo
BACKGROUND: Helicobacter pylori (H. pylori) is a Gram-negative, microaerophilic bacterium that is recognized as a major cause of chronic gastritis, peptic ulcers, and gastric cancer. Comparable to other Gram-negative bacteria, lipopolysaccharides (LPS) are an important cellular component of the outer membrane of H. pylori. The LPS of this organism plays a key role in its colonization and persistence in the stomach. In addition, H. pylori LPS modulates pathogen-induced host inflammatory responses resulting in chronic inflammation within the gastrointestinal tract...
December 4, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/29202336/colonization-localization-and-inflammation-the-roles-of-h-pylori-chemotaxis-in-vivo
#13
REVIEW
Kevin S Johnson, Karen M Ottemann
Helicobacter pylori is a Gram-negative bacterium that infects half of the world's population, causing gastritis, peptic ulcers, and gastric cancer. To establish chronic stomach infection, H. pylori utilizes chemotaxis, driven by a conserved signal transduction system. Chemotaxis allows H. pylori to sense an array of environmental and bacterial signals within the stomach, guiding its motility towards its preferred niche within the gastric mucosa and glands. Fine-tuned localization, regulated by the chemotaxis system, enables robust colonization during the acute stage of infection...
December 1, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/29199594/dna-double-strand-breaks-caused-by-different-microorganisms-a-special-focus-on-helicobacter-pylori
#14
Pinar Erkekoglu, Didem Oral, Belmar Kocer-Gumusel, Ming-Wei Chao
The association between inflammation and cancer has long been recognized. Several studies have found that different types of tumors develop at sites of chronic inflammation. It is stated that over 15%-20% of malignancies worldwide can be related to infections caused by viruses, bacteria, and schistosomes. Inflammatory conditions are characterized by overexpression of inducible nitric oxide synthase (iNOS) and overproduction of nitric oxide/reactive nitrogen species (ROSs/RNSs) in epithelial cells. Reactive oxygen species (ROSs) may also lead to cellular alterations and eventually to inflammation...
2017: Journal of Environmental Pathology, Toxicology and Oncology
https://www.readbyqxmd.com/read/29197783/lotus-tetragonolobus-and-maackia-amurensis-lectins-influence-phospho-i%C3%AE%C2%BAb%C3%AE-il-8-lewis-b-and-h-type-1-glycoforms-levels-in-h-pylori-infected-crl-1739-gastric-cancer-cells
#15
Iwona Radziejewska, Małgorzata Borzym-Kluczyk, Katarzyna Leszczyńska, Joanna Wosek, Anna Bielawska
PURPOSE: Attachment of Helicobacter pylori to the mucous epithelial cells and the mucous layer is said to be a crucial step for infection development. Sugar antigens of gastric mucins (MUC5AC, MUC1) can act as receptors for bacterial adhesins. The aim of the study was to investigate if Lotus tetragonolobus and Maackia amurensis lectins influence the level of MUC1, MUC5AC, Lewis b, H type 1, sialyl Lewis x, phospho-IκBα and interleukin 8 in Helicobacter pylori infected gastric cancer cells...
November 30, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/29193217/reversibility-of-atrophic-gastritis-and-intestinal-metaplasia-after-helicobacter-pylori-eradication-a-prospective-study-for-up-to-10-years
#16
Y-J Hwang, N Kim, H S Lee, J B Lee, Y J Choi, H Yoon, C M Shin, Y S Park, D H Lee
BACKGROUND: Atrophic gastritis and intestinal metaplasia are premalignant conditions for gastric cancer. Their reversibility by Helicobacter pylori eradication remains controversial. AIM: To evaluate the reversibility of atrophic gastritis and intestinal metaplasia by H. pylori eradication with long-term follow-up. METHODS: 598 subjects were prospectively enrolled and followed for up to 10 years. They were categorised as H. pylori-negative (n = 65), H...
November 29, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29186206/genetic-signatures-for-helicobacter-pylori-strains-of-west-african-origin
#17
Kennady K Bullock, Carrie L Shaffer, Andrew W Brooks, Ousman Secka, Mark H Forsyth, Mark S McClain, Timothy L Cover
Helicobacter pylori is a genetically diverse bacterial species that colonizes the stomach in about half of the human population. Most persons colonized by H. pylori remain asymptomatic, but the presence of this organism is a risk factor for gastric cancer. Multiple populations and subpopulations of H. pylori with distinct geographic distributions are recognized. Genetic differences among these populations might be a factor underlying geographic variation in gastric cancer incidence. Relatively little is known about the genomic features of African H...
2017: PloS One
https://www.readbyqxmd.com/read/29177209/h-pylori-infection-and-gastric-cancer-in-bangladesh-a-case-control-study
#18
Khandker Kawser Sarker, Md Jahangir Kabir, A K M Minhaj Uddin Bhuyian, Md Shahjadul Alam, Fazle Rabbi Chowdhury, M Abdul Ahad, Md Anisur Rahman, M Mizanur Rahman
Background: Like that of other Asian countries gastric cancer (GC) is also a leading cancer in Bangladesh and also a cause for cancer-related mortality. Infection with Helicobacter pylori (H. pylori) is the strongest recognized risk factor for gastric adenocarcinoma. The infection is also prevalent in common people. This case-control study was carried out to find an association between GC and H. pylori infection in the community. Materials and Methods: To evaluate association of H...
November 2017: International Journal of Surgery. Oncology
https://www.readbyqxmd.com/read/29166909/multiscale-positive-feedbacks-contribute-to-unidirectional-gastric-disease-progression-induced-by-helicobacter-pylori-infection
#19
Richard Ballweg, Frederick Schozer, Kelsey Elliott, Alexander Kuhn, Logan Spotts, Eitaro Aihara, Tongli Zhang
BACKGROUND: Helicobacter Pylori (HP) is the most common risk factor for gastric cancer. Nearly half the world's population is infected with HP, but only a small percentage of those develop significant pathology. The bacteria itself does not directly cause cancer; rather it promotes an environment that is conducive to tumor formation. Upon infection, HP induces transcriptional changes in the host, leading to enhanced proliferation and host immune response. In addition, HP causes direct damage to gastric epithelial cells...
November 22, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/29162845/helicobacter-pylori-targets-mitochondrial-import-and-components-of-mitochondrial-dna-replication-machinery-through-an-alternative-vaca-dependent-and-a-vaca-independent-mechanisms
#20
Laurent Chatre, Julien Fernandes, Valérie Michel, Laurence Fiette, Patrick Avé, Giuseppe Arena, Utkarsh Jain, Rainer Haas, Timothy C Wang, Miria Ricchetti, Eliette Touati
Targeting mitochondria is a powerful strategy for pathogens to subvert cell physiology and establish infection. Helicobacter pylori is a bacterial pathogen associated with gastric cancer development that is known to target mitochondria directly and exclusively through its pro-apoptotic and vacuolating cytotoxin VacA. By in vitro infection of gastric epithelial cells with wild-type and VacA-deficient H. pylori strains, treatment of cells with purified VacA proteins and infection of a mouse model, we show that H...
November 21, 2017: Scientific Reports
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