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Helicobacter and gastric cancer

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https://www.readbyqxmd.com/read/28331349/antibiotic-resistance-among-helicobacter-pylori-clinical-isolates-in-lima-peru
#1
Kevin F Boehnke, Manuel Valdivieso, Alejandro Bussalleu, Rachael Sexton, Kathryn C Thompson, Soledad Osorio, Italo Novoa Reyes, John J Crowley, Laurence H Baker, Chuanwu Xi
OBJECTIVES: Gastric carcinoma is the most common cancer and cause of cancer mortality in Peru. Helicobacter pylori, a bacterium that colonizes the human stomach, is a Group 1 carcinogen due to its causal relationship to gastric carcinoma. While eradication of H. pylori can help prevent gastric cancer, characterizing regional antibiotic resistance patterns is necessary to determine targeted treatment for each region. Thus, we examined primary antibiotic resistance in clinical isolates of H...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28327825/genotype-association-gstm1-null-and-gastric-cancer-evidence-based-meta-analysis
#2
Rívian Xavier Ribeiro, Cícera Isabella Leão Leite Nascimento, Antonio Márcio Teodoro Cordeiro Silva
BACKGROUND: Gastric cancer is the fourth most common cancer in men and the sixth among women, except for non-melanoma skin tumors, in Brazil. Epidemiological evidences reveal the multifactorial etiology of this cancer, highlighting risk factors such as: infection by the bacterium Helicobacter pylori, advanced age, smoking, chronic alcohol abuse, eating habits and genetic polymorphisms. Considering the context of genetic polymorphisms, there is the absence of the GSTM1 gene. The lack of GSTM1 function to detoxify xenobiotics and promote defense against oxidative stress leads to increased DNA damage, promoting gastric carcinogenesis...
March 16, 2017: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/28326664/the-corpus-predominant-gastritis-index-can-be-an-early-and-reversible-marker-to-identify-the-gastric-cancer-risk-of-helicobacter-pylori-infected-nonulcer-dyspepsia
#3
Hsiu-Chi Cheng, Yu-Ching Tsai, Hsiao-Bai Yang, Yi-Chun Yeh, Wei-Lun Chang, Hsin-Yu Kuo, Cheng-Chan Lu, Bor-Shyang Sheu
BACKGROUND: Corpus-predominant gastritis index (CGI) is an early histological marker to identify Helicobacter pylori-infected gastric cancer relatives at risk of cancer. This study validated whether CGI is more prevalent in H. pylori-infected nonulcer dyspepsia (NUD) subjects than in duodenal ulcer (DU) controls and whether it is reversible after H. pylori eradication or is correlated with noninvasive biomarkers. MATERIALS AND METHODS: In this longitudinal cohort study, 573 H...
March 22, 2017: Helicobacter
https://www.readbyqxmd.com/read/28323552/helicobacter-pylori-eradication-in-the-swedish-population
#4
Eva Doorakkers, Jesper Lagergren, Vijaya Krishna Gajulapuri, Steven Callens, Lars Engstrand, Nele Brusselaers
OBJECTIVES: Helicobacter pylori is associated with peptic ulcers and gastric cancer and its eradication aims to prevent these conditions. The recommended eradication regimen is triple therapy, consisting of a proton-pump inhibitor in combination with clarithromycin and amoxicillin or metronidazole for 7 days. Yet, other antibiotic regimens are sometimes prescribed. We aimed to assess the use of eradication therapy for H. pylori in the Swedish population during the last decade. MATERIALS AND METHODS: This population-based study used data from the Swedish Prescribed Drug Register...
March 21, 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/28323271/a-serological-biopsy-using-five-stomach-specific-circulating-biomarkers-for-gastric-cancer-risk-assessment-a-multi-phase-study
#5
Huakang Tu, Liping Sun, Xiao Dong, Yuehua Gong, Qian Xu, Jingjing Jing, Roberd M Bostick, Xifeng Wu, Yuan Yuan
OBJECTIVES: We aimed to assess a serological biopsy using five stomach-specific circulating biomarkers-pepsinogen I (PGI), PGII, PGI/II ratio, anti-Helicobacter pylori (H. pylori) antibody, and gastrin-17 (G-17)-for identifying high-risk individuals and predicting risk of developing gastric cancer (GC). METHODS: Among 12,112 participants with prospective follow-up from an ongoing population-based screening program using both serology and gastroscopy in China, we conducted a multi-phase study involving a cross-sectional analysis, a follow-up analysis, and an integrative risk prediction modeling analysis...
March 21, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28322295/alterations-in-gastric-microbiota-after-h-pylori-eradication-and-in-different-histological-stages-of-gastric-carcinogenesis
#6
Tung Hiu Li, Youwen Qin, Pak Chung Sham, K S Lau, Kent-Man Chu, Wai K Leung
The role of bacteria other than Helicobacter pylori (HP) in the stomach remains elusive. We characterized the gastric microbiota in individuals with different histological stages of gastric carcinogenesis and after receiving HP eradication therapy. Endoscopic gastric biopsies were obtained from subjects with HP gastritis, gastric intestinal metaplasia (IM), gastric cancer (GC) and HP negative controls. Gastric microbiota was characterized by Illumina MiSeq platform targeting the 16 S rDNA. Apart from dominant H...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28322182/helicobacter-pylori-as-an-oncogenic-pathogen-revisited
#7
Muhammad Miftahussurur, Yoshio Yamaoka, David Y Graham
Gastric cancer is an inflammation-associated malignancy aetiologically related to infection with the bacterium, Helicobacter pylori, which is considered a necessary but insufficient cause. Unless treated, H. pylori causes life-long acute and chronic gastric inflammation resulting in progressive gastric mucosal damage that may result in gastric cancer. The rate of progression from superficial gastritis, to an atrophic metaplastic mucosa, and ultimately to cancer relates to the virulence of the infecting H. pylori as well as host and environmental factors...
March 21, 2017: Expert Reviews in Molecular Medicine
https://www.readbyqxmd.com/read/28321154/host-pathogen-interactions-in-helicobacter-pylori-related-gastric-cancer
#8
EDITORIAL
Magdalena Chmiela, Zuzanna Karwowska, Weronika Gonciarz, Bujana Allushi, Paweł Stączek
Helicobacter pylori (H. pylori), discovered in 1982, is a microaerophilic, spiral-shaped gram-negative bacterium that is able to colonize the human stomach. Nearly half of the world's population is infected by this pathogen. Its ability to induce gastritis, peptic ulcers, gastric cancer and mucosa-associated lymphoid tissue lymphoma has been confirmed. The susceptibility of an individual to these clinical outcomes is multifactorial and depends on H. pylori virulence, environmental factors, the genetic susceptibility of the host and the reactivity of the host immune system...
March 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28321054/efficacy-of-the-kyoto-classification-of-gastritis-in-identifying-patients-at-high-risk-for-gastric-cancer
#9
Mitsushige Sugimoto, Hiromitsu Ban, Hitomi Ichikawa, Shu Sahara, Taketo Otsuka, Osamu Inatomi, Shigeki Bamba, Takahisa Furuta, Akira Andoh
Objective The Kyoto gastritis classification categorizes the endoscopic characteristics of Helicobacter pylori (H. pylori) infection-associated gastritis and identifies patterns associated with a high risk of gastric cancer. We investigated its efficacy, comparing scores in patients with H. pylori-associated gastritis and with gastric cancer. Methods A total of 1,200 patients with H. pylori-positive gastritis alone (n=932), early-stage H. pylori-positive gastric cancer (n=189), and successfully treated H. pylori-negative cancer (n=79) were endoscopically graded according to the Kyoto gastritis classification for atrophy, intestinal metaplasia, fold hypertrophy, nodularity, and diffuse redness...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28319273/gastric-microbiota-features-associated-with-cancer-risk-factors-and-clinical-outcomes-a-pilot-study-in-gastric-cardia-cancer-patients-from-shanxi-china
#10
Guoqin Yu, Nan Hu, Lemin Wang, Chaoyu Wang, Xiao-You Han, Mike Humphry, Jacques Ravel, Christian C Abnet, Philip R Taylor, Alisa M Goldstein
Little is known about the link between gastric microbiota and the epidemiology of gastric cancer. In order to determine the epidemiologic and clinical relevance of gastric microbiota, we used 16S ribosomal RNA gene sequencing analysis to characterize the composition and structure of the gastric microbial community of 80 paired samples (non-malignant and matched tumor tissues) from gastric cardia adenocarcinoma (GCA) patients in Shanxi, China. We also used PICRUSt to predict microbial functional profiles. Compared to patients without family history of upper gastrointestinal (UGI) cancer in the non-malignant gastric tissue microbiota, patients with family history of UGI cancer had higher Helicobacter pylori (Hp) relative abundance (median: 0...
March 20, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28306723/the-redefinition-of-helicobacter-pylori-lipopolysaccharide-o-antigen-and-core-oligosaccharide-domains
#11
Hong Li, Tiandi Yang, Tingting Liao, Aleksandra W Debowski, Hans-Olof Nilsson, Alma Fulurija, Stuart M Haslam, Barbara Mulloy, Anne Dell, Keith A Stubbs, Barry J Marshall, Mohammed Benghezal
Helicobacter pylori lipopolysaccharide promotes chronic gastric colonisation through O-antigen host mimicry and resistance to mucosal antimicrobial peptides mediated primarily by modifications of the lipid A. The structural organisation of the core and O-antigen domains of H. pylori lipopolysaccharide remains unclear, as the O-antigen attachment site has still to be identified experimentally. Here, structural investigations of lipopolysaccharides purified from two wild-type strains and the O-antigen ligase mutant revealed that the H...
March 17, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28293542/whole-genome-sequence-and-phylogenetic-analysis-show-helicobacter-pylori-strains-from-latin-america-have-followed-a-unique-evolution-pathway
#12
Zilia Y Muñoz-Ramírez, Alfonso Mendez-Tenorio, Ikuko Kato, Maria M Bravo, Cosmeri Rizzato, Kaisa Thorell, Roberto Torres, Francisco Aviles-Jimenez, Margarita Camorlinga, Federico Canzian, Javier Torres
Helicobacter pylori (HP) genetics may determine its clinical outcomes. Despite high prevalence of HP infection in Latin America (LA), there have been no phylogenetic studies in the region. We aimed to understand the structure of HP populations in LA mestizo individuals, where gastric cancer incidence remains high. The genome of 107 HP strains from Mexico, Nicaragua and Colombia were analyzed with 59 publicly available worldwide genomes. To study bacterial relationship on whole genome level we propose a virtual hybridization technique using thousands of high-entropy 13 bp DNA probes to generate fingerprints...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28289177/structural-diversity-of-human-gastric-mucin-glycans
#13
Chunsheng Jin, Diarmuid T Kenny, Emma C Skoog, Medéa Padra, Barbara Adamczyk, Varvara Vitizeva, Anders Thorell, Vignesh Venkatakrishnan, Sara K Lindén, Niclas G Karlsson
The mucin O-glycosylation of 10 individuals with and without gastric disease was examined in depth in order to generate a structural map of human gastric glycosylation. In the stomach, these mucins and their O-glycosylation protect the epithelial surface from the acidic gastric juice and provide the first point of interaction for pathogens such as Helicobacter pylori, reported to cause gastritis, gastric and duodenal ulcers and gastric cancer. The rational of the present study was to map the O-glycosylation that the pathogen may come in contact with...
March 13, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28288471/early-stage-gastric-cancer-can-be-found-in-improved-atrophic-mucosa-over-time-from-successful-helicobacter-pylori-eradication
#14
Atsushi Majima, Osamu Handa, Yuji Naito, Osamu Dohi, Tetsuya Okayama, Naohisa Yoshida, Kazuhiro Kamada, Kazuhiro Katada, Kazuhiko Uchiyama, Takeshi Ishikawa, Tomohisa Takagi, Hideyuki Konishi, Nobuaki Yagi, Yoshito Itoh
BACKGROUND/AIMS: Early-stage gastric cancer (EGC) is detected even after successful Helicobacter pylori eradication. This study is aimed at clarifying the clinicopathological characteristics of EGC detected after successful H. pylori eradication. METHODS: This retrospective study analyzed 57 cases of EGC detected after successful H. pylori eradication and resected endoscopically at Kyoto Prefectural University of Medicine, between January 2009 and June 2014. Clinicopathological findings of 57 cases (H...
March 14, 2017: Digestion
https://www.readbyqxmd.com/read/28287480/helicobacter-pylori-outer-membrane-protein-related-pathogenesis
#15
REVIEW
Yuichi Matsuo, Yasutoshi Kido, Yoshio Yamaoka
Helicobacter pylori colonizes the human stomach and induces inflammation, and in some cases persistent infection can result in gastric cancer. Attachment to the gastric mucosa is the first step in establishing bacterial colonization, and outer membrane proteins (OMPs) play a pivotal role in binding to human cells. Some OMP interaction molecules are known in H. pylori, and their associated host cell responses have been gradually clarified. Many studies have demonstrated that OMPs are essential to CagA translocation into gastric cells via the Type IV secretion system of H...
March 11, 2017: Toxins
https://www.readbyqxmd.com/read/28283946/association-between-caga-vacai-and-dupa-genes-of-helicobacter-pylori-and-gastroduodenal-pathologies-in-chilean-patients
#16
Esteban Paredes-Osses, Katia Sáez, Enrique Sanhueza, Sonja Hebel, Carlos González, Carlos Briceño, Apolinaria García Cancino
In addition to the already known cagA gene, novel genetic markers have been associated with Helicobacter pylori (H. pylori) virulence: the dupA and vacAi genes. These genes might play an important role as specific markers to determine the clinical outcome of the disease, especially the vacAi gene, which has been expected to be a good marker of severe pathologies like gastric adenocarcinoma. In the present study, the association of cagA, dupA, and vacAi genes with gastroduodenal pathologies in Chilean patients was studied...
March 11, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28279154/receiver-operating-characteristic-analysis-of-prediction-for-gastric-cancer-development-using-serum-pepsinogen-and-helicobacter-pylori-antibody-tests
#17
Chisato Hamashima, Shizuka Sasazuki, Manami Inoue, Shoichiro Tsugane
BACKGROUND: Chronic Helicobacter pylori infection plays a central role in the development of gastric cancer as shown by biological and epidemiological studies. The H. pylori antibody and serum pepsinogen (PG) tests have been anticipated to predict gastric cancer development. METHODS: We determined the predictive sensitivity and specificity of gastric cancer development using these tests. Receiver operating characteristic analysis was performed, and areas under the curve were estimated...
March 9, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28275687/hedgehog-signaling-links-chronic-inflammation-to-gastric-cancer-precursor-lesions
#18
REVIEW
Juanita L Merchant, Lin Ding
Since its initial discovery in Drosophila, Hedgehog (HH) signaling has long been associated with foregut development. The mammalian genome expresses 3 HH ligands, with sonic hedgehog (SHH) levels highest in the mucosa of the embryonic foregut. More recently, interest in the pathway has shifted to improving our understanding of its role in gastrointestinal cancers. The use of reporter mice proved instrumental in our ability to probe the expression pattern of SHH ligand and the cell types responding to canonical HH signaling during homeostasis, inflammation, and neoplastic transformation...
March 2017: Cellular and Molecular Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28275686/historical-perspective-on-familial-gastric-cancer
#19
REVIEW
C Richard Boland, Matthew B Yurgelun
Gastric cancer is a common disease worldwide, typically associated with acquired chronic inflammation in the stomach, related in most instances to infection by Helicobacter pylori. A small percentage of cases occurs in familial clusters, and some of these can be linked to specific germline mutations. This article reviews the historical background to the current understanding of familial gastric cancer, focuses on the entity of hereditary diffuse gastric cancer, and also reviews the risks for gastric cancer related to a number of other familial genetic diseases...
March 2017: Cellular and Molecular Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28275685/the-clinical-evidence-linking-helicobacter-pylori-to-gastric-cancer
#20
REVIEW
Steven F Moss
Gastric cancer has long been recognized to be accompanied and preceded by chronic gastritis, lasting decades. Arguably, the most important development in our understanding of gastric cancer pathogenesis over the past 50 years has been the realization that, for most cases of gastric cancer, Helicobacter pylori is the cause of the underlying gastritis. Gastritis can promote gastric carcinogenesis, typically via the Correa cascade of atrophic gastritis, intestinal metaplasia, and dysplasia. Nested case-control studies have shown that H pylori infection increases the risk of gastric cancer significantly, both of the intestinal and diffuse subtypes, and that H pylori is responsible for approximately 90% of the world's burden of noncardia gastric cancer...
March 2017: Cellular and Molecular Gastroenterology and Hepatology
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