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https://www.readbyqxmd.com/read/29776635/molecular-diagnostics-in-esophageal-and-gastric-neoplasms-2018-update
#1
REVIEW
Muhammad Zulfiqar, Martin H Bluth, Amarpreet Bhalla
Esophageal cancer (EC) is rapidly increasing in incidence in the United States. Genetic changes associated with the development of EC involve the p16, p53, and APC genes. Human epidermal growth factor 2 (HER-2) overexpression is seen in gastroesophageal junction carcinoma and a subset gastric carcinoma (GC). Interestingly, up to 50% cases of GC are related to Helicobacter pylori infection and up to 16% are related to EBV infection. Microsatellite instability is observed in up to 39% of GC and cell free nucleic acid analysis provides additional opportunities for diagnosis and prognosis of disease...
June 2018: Clinics in Laboratory Medicine
https://www.readbyqxmd.com/read/29776416/rapid-urease-test-rut-for-evaluation-of-urease-activity-in-oral-bacteria-in-vitro-and-in-supragingival-dental-plaque-ex-vivo
#2
Gunnar Dahlén, Haidar Hassan, Susanne Blomqvist, Anette Carlén
BACKGROUND: Urease is an enzyme produced by plaque bacteria hydrolysing urea from saliva and gingival exudate into ammonia in order to regulate the pH in the dental biofilm. The aim of this study was to assess the urease activity among oral bacterial species by using the rapid urease test (RUT) in a micro-plate format and to examine whether this test could be used for measuring the urease activity in site-specific supragingival dental plaque samples ex vivo. METHODS: The RUT test is based on 2% urea in peptone broth solution and with phenol red at pH 6...
May 18, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29774633/a-simple-and-cost-efficient-adherent-culture-platform-for-human-gastric-primary-cells-as-an-in-vitro-model-for-helicobacter-pylori-infection
#3
Samaneh Saberi, Behshad Pournasr, Zahra Farzaneh, Maryam Esmaeili, Mahmoud Eshagh Hosseini, Hossein Baharvand, Marjan Mohammadi
BACKGROUND: Most two- dimensional in vitro models for studying host- H. pylori interactions rely on tumor-derived cell lines, which harbor malignant alterations. The recent development of human gastric organoids has overcome this limitation and provides a highly sophisticated, yet costly, short-term model for H. pylori infection, with restricted use in low-budget centers. METHOD: Tissue specimens from upper, middle, and lower stomachs of H. pylori-negative volunteers were collectively dispersed and cultured on mouse embryonic fibroblast (MEF) or collagen-coated plates...
May 17, 2018: Helicobacter
https://www.readbyqxmd.com/read/29774218/new-insights-of-helicobacter-pylori-host-pathogen-interactions-the-triangle-of-virulence-factors-epigenetic-modifications-and-non-coding-rnas
#4
REVIEW
Farzam Vaziri, Samira Tarashi, Abolfazl Fateh, Seyed Davar Siadat
Helicobacter pylori ( H. pylori ) is a model organism for understanding host-pathogen interactions and infection-mediated carcinogenesis. Gastric cancer and H. pylori colonization indicates the strong correlation. The progression and exacerbation of H. pylori infection are influenced by some factors of pathogen and host. Several virulence factors involved in the proper adherence and attenuation of immune defense to contribute the risk of emerging gastric cancer, therefore analysis of them is very important...
May 16, 2018: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/29774152/acquisition-of-double-mutation-in-gyra-caused-high-resistance-to-sitafloxacin-in-helicobacter-pylori-after-unsuccessful-eradication-with-sitafloxacin-containing-regimens
#5
Hideki Mori, Hidekazu Suzuki, Juntaro Matsuzaki, Tatsuhiro Masaoka, Takanori Kanai
Background and aim: Although sitafloxacin (STFX)-containing regimens are effective rescue treatments for Helicobacter pylori infection, prevalence of fluoroquinolone resistance in H. pylori has increased rapidly worldwide. The change in resistance levels and gyrA mutations, a major cause of fluoroquinolone resistance, after unsuccessful STFX-containing treatment has not been investigated. Methods: We conducted a retrospective, non-randomized study to compare the minimum inhibitory concentrations (MICs) of STFX and the location of gyrA mutations in H...
April 2018: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/29773406/dynamics-of-helicobacter-pylori-infection-in-infants-during-the-first-six-months-of-life
#6
José S Merino, Liliana Araneda, Paulina Lincoñir-Campos, Cristian Parra, Katia Sáez, Apolinaria García
INTRODUCTION: Mainly due to the high percentage of infection and the ineffectiveness of treatments, Helicobacter pylori is a global health problem. Knowing the age at acquisition is key to preventing the infection. PATIENTS: Sixty-seven mothers and their respective children participated. To evaluate the presence of H. pylori, the faeces of the mother and her child were analysed using the HpSA antigen test. RESULTS: 71.6% (48/67) of pregnant mothers were positive for H...
May 14, 2018: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/29771269/upper-gastrointestinal-alterations-in-kidney-transplant-candidates
#7
João Pedro Homse Netto, João Pedro Sant'Anna Pinheiro, Mariana Lopes Ferrari, Mirella Tizziani Soares, Rogério Augusto Gomes Silveira, Mariana Espiga Maioli, Vinicius Daher Alvares Delfino
INTRODUCTION: The incidence of gastrointestinal disorders among patients with chronic kidney disease (CKD) is high, despite the lack of a good correlation between endoscopic findings and symptoms. Many services thus perform upper gastrointestinal (UGI) endoscopy on kidney transplant candidates. OBJECTIVES: This study aims to describe the alterations seen on the upper endoscopies of 96 kidney-transplant candidates seen from 2014 to 2015. METHODS: Ninety-six CKD patients underwent upper endoscopic examination as part of the preparation to receive kidney grafts...
May 14, 2018: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29770171/risk-of-gastric-cancer-development-after-eradication-of-helicobacter-pylori
#8
REVIEW
Ka-Shing Cheung, Wai K Leung
Helicobacter pylori ( H. pylori ) infection is the most important risk factor for gastric cancer (GC) development through the Correa's gastric carcinogenesis cascade. However, H. pylori eradication alone does not eliminate GC, as pre-neoplastic lesions (atrophic gastritis, intestinal metaplasia and dysplasia) may have already developed in some patients. It is therefore necessary to identify patients at high-risk for gastric cancer after H. pylori eradication to streamline the management plan. If the patients have not undergone endoscopy with histologic assessment, the identification of certain clinical risk factors and non-invasive testing (serum pepsinogen) can predict the risk of atrophic gastritis...
May 15, 2018: World Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29768551/risk-factors-of-helicobacter-pylori-infection-in-an-urban-community-in-northeast-brazil-and-the-relationship-between-the-infection-and-gastric-diseases
#9
Irigrácin Lima Diniz Basílio, Maria de Fátima Celino Catão, Janilson Dantas de Sousa Carvalho, Francisco Paulo Freire-Neto, Leonardo Capristano Ferreira, Selma Maria Bezerra Jerônimo
INTRODUCTION: Helicobacter pylori, a water contaminant, is the primary pathogenic agent associated with gastric diseases in humans. Exposure to H. pylori is more likely higher in developing countries. This study aimed to evaluate the risk factors associated with H. pylori infection in patients undergoing endoscopy to validate the cause of dyspeptic symptoms in an urban population in northeast Brazil and to compare the urease test and polymerase chain reaction assay results with the histopathological findings...
March 2018: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29768373/acute-myelitis-of-children-with-positive-anti-gm1-antibody-case-series-and-literature-review
#10
Zhiling Wang, Di Qie, Hui Zhou, Xiao Tang Cai
RATIONALE: To explore the clinical features, treatment, and prognosis of acute myelitis (AM) of children with positive blood anti- ganglioside (GM1) antibodies. PATIENT CONCERNS: Two cases of AM of children with positive anti-GM1 antibody were retrospectively collected and followed up for 6 months. Two cases had positive helicobacter pylori IgG antibody, and Case 2 also had positive mycoplasma IgM antibody. DIAGNOSES: Two cases had typical symptoms of myelitis, abnormal spinal magnetic resonance imaging (MRI), and positive serum anti-GM1 IgM...
May 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29766826/analysis-of-baba-cage-and-caga-genes-in-helicobacter-pylori-from-upper-gastric-patients-in-the-north-of-iran
#11
Saba Fakhrieh Asl, Mehrnaz Pourvahedi, Ali Mojtahedi, Mohammad Shenagari
OBJECTIVE: Helicobacter pylori is a Gram-negative bacterium which has a serious effect on the up to half of the world's population and has been related to different gastric diseases. The goal of this study was to assess the frequency of babA, cagE and cagA genotypes among H. pylori strains isolated from gastric biopsies of endoscopic patients in the north of Iran. METHODS: The present study was performed on 90 strains of H. pylori isolated from patients with gastric diseases (Gastric ulcer (GU), Duodenal ulcer (DU), Gastritis (G), Non-ulcer dyspepsia (NUD) and Gastric adenocarcinoma (GC))...
May 14, 2018: Infectious Disorders Drug Targets
https://www.readbyqxmd.com/read/29766504/indene-compounds-synthetically-derived-from-vitamin-d-have-selective-antibacterial-action-on-helicobacter-pylori
#12
Kiyofumi Wanibuchi, Kouichi Hosoda, Masato Ihara, Kentaro Tajiri, Yuki Sakai, Hisashi Masui, Takashi Takahashi, Yoshikazu Hirai, Hirofumi Shimomura
Helicobacter pylori infects the human stomach and is closely linked with the development of gastric cancer. When detected, this pathogen can be eradicated from the human stomach using wide-spectrum antibiotics. However, year by year, H. pylori strains resistant to the antibacterial action of antibiotics have been increasing. The development of new antibacterial substances effective against drug-resistant H. pylori is urgently required. Our group has recently identified extremely selective bactericidal effects against H...
May 16, 2018: Lipids
https://www.readbyqxmd.com/read/29765142/targeted-deep-sequencing-of-gastric-marginal-zone-lymphoma-identified-alterations-of-traf3-and-tnfaip3-that-were-mutually-exclusive-for-malt1-rearrangement
#13
Jiyeon Hyeon, Boram Lee, So-Hyun Shin, Hae Yong Yoo, Seok Jin Kim, Won Seog Kim, Woong-Yang Park, Young-Hyeh Ko
Gastric extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue is a distinct entity in that Helicobacter pylori infection plays the most important causative role in the development of the disease. To investigate the genomic alteration in gastric marginal zone lymphoma that was resistant to the H. pylori eradication therapy, we analyzed 19 cases of the gastric marginal zone lymphoma using fluorescence in situ hybridization for MALT1, BCL10 rearrangement, and targeted sequencing using an Illumina platform...
May 15, 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/29764950/cagy-dependent-regulation-of-type-iv-secretion-in-helicobacter-pylori-is-associated-with-alterations-in-integrin-binding
#14
Emma C Skoog, Vasilios A Morikis, Miriam E Martin, Greg A Foster, Lucy P Cai, Lori M Hansen, Beibei Li, Jennifer A Gaddy, Scott I Simon, Jay V Solnick
Strains of Helicobacter pylori that cause ulcer or gastric cancer typically express a type IV secretion system (T4SS) encoded by the cag pathogenicity island ( cag PAI). CagY is an ortholog of VirB10 that, unlike other VirB10 orthologs, has a large middle repeat region (MRR) with extensive repetitive sequence motifs, which undergo CD4+ T cell-dependent recombination during infection of mice. Recombination in the CagY MRR reduces T4SS function, diminishes the host inflammatory response, and enables the bacteria to colonize at a higher density...
May 15, 2018: MBio
https://www.readbyqxmd.com/read/29763614/association-of-oral-helicobacter-pylori-with-gastric-complications
#15
Shazia A Ansar, Mehir Un Nisa Iqbal, Taseer A Khan, Shahana U Kazmi
AIM: This study was aimed to identify the presence of Helicobacter pylori (H. pylori) genes in oral mucosa and find out their relationship between oral H. pylori infection and gastric complications. METHODS: This study is a case control study consists of 567 subjects with periodontal infection (278 gastric complication cases and 289 controls normal gastric intestinal mucosa) with age range of 20-80 years. Oral health status was recorded by calculating oral hygiene index (OHI), probing depths (PD) and clinical attachment loss (CAL)...
May 12, 2018: Life Sciences
https://www.readbyqxmd.com/read/29762682/molecular-detection-of-mutations-involved-in-helicobacter-pylori-antibiotic-resistance-in-algeria
#16
Meryem Bachir, Rachida Allem, Lucie Benejat, Abedelkarim Tifrit, Meriem Medjekane, Amine El-Mokhtar Drici, Francis Megraud, Kara Turki Douidi
Objectives: In Algeria, there are limited data regarding the pattern of Helicobacter pylori primary antibiotic resistance. The aim of this study was to evaluate the primary resistance of H. pylori to clarithromycin, ciprofloxacin, tetracycline and rifampicin and to determine the molecular mechanisms involved in the resistance. Methods: Two hundred and seventy Algerian adults who had never received H. pylori treatment were enrolled in this study. Human biopsies were obtained for culture and antimicrobial susceptibility testing was performed by Etest for clarithromycin, ciprofloxacin, tetracycline and rifampicin...
May 11, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29755012/association-of-a-single-nucleotide-polymorphism-in-the-tlr2-gene-rs3804099-but-not-in-the-tlr4-gene-rs4986790-with-helicobacter-pylori-infection-and-peptic-ulcer
#17
Ehsan Mirkamandar, Maryam Nemati, Mohammad Mehdi Hayatbakhsh, Arezu Bassagh, Arezu Khosravimashizi, Abdollah Jafarzadeh
BACKGROUND/AIMS: Toll-like receptors (TLRs), particularly TLR2 and TLR4, take part in elicitation of immune responses against Helicobacter pylori (H. pylori). This study aimed to investigate the relationship between single nucleotide polymorphisms (SNP) rs3804099 in the TLR2 gene and rs4986790 in the TLR4 gene with H. pylori infection and peptic ulcer (PU). MATERIALS AND METHODS: Blood specimens were obtained from 350 individuals, including 100 H. pylori-infected patients with PU, 125 H...
May 2018: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
https://www.readbyqxmd.com/read/29752266/biofilm-formation-by-helicobacter-pylori-is-differentially-affected-by-common-culture-conditions-and-protein-plays-a-central-role-in-the-biofilm-matrix
#18
Ian H Windham, Stephanie L Servetas, Jeannette M Whitmire, Daniel Pletzer, Robert E W Hancock, D Scott Merrell
The concept of Helicobacter pylori biofilm formation is relatively new. To help provide a foundation for future biofilm studies, we characterized the biofilm formation ability of a common H. pylori lab strain, G27. The goal of this study was to evaluate biofilm formation by G27 in response to common culture conditions and to explore the biofilm matrix. Our results indicate that while growth in varies types of media did not dramatically effect biofilm formation, surface selection had a significant effect on final biofilm mass...
May 11, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29751628/the-double-face-of-mucin-type-o-glycans-in-lectin-mediated-infection-and-immunity
#19
REVIEW
Vasily Morozov, Julia Borkowski, Franz-Georg Hanisch
Epithelial human blood group antigens (HBGAs) on O-glycans play roles in pathogen binding and the initiation of infection, while similar structures on secretory mucins exert protective functions. These double-faced features of O-glycans in infection and innate immunity are reviewed based on two instructive examples of bacterial and viral pathogens. Helicobacter pylori represents a class 1 carcinogen in the human stomach. By expressing blood group antigen-binding adhesin ( BabA ) and LabA adhesins that bind to Lewis-b and LacdiNAc, respectively, H...
May 11, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29751550/is-there-a-role-for-the-non-helicobacter-pylori-bacteria-in-the-risk-of-developing-gastric-cancer
#20
REVIEW
Jackie Li, Guillermo I Perez Perez
Helicobacter pylori is the most abundant bacterium in the gastric epithelium, and its presence has been associated with the risk of developing gastric cancer. As of 15 years ago, no other bacteria were associated with gastric epithelial colonization; but thanks to new methodologies, many other non- H. pylori bacteria have been identified. It is possible that non- H. pylori may have a significant role in the development of gastric cancer. Here, we discuss the specific role of H. pylori as a potential trigger for events that may be conducive to gastric cancer, and consider whether or not the rest of the gastric microbiota represent an additional risk in the development of this disease...
May 3, 2018: International Journal of Molecular Sciences
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