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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/29775804/in-silico-study-of-the-active-site-of-helicobacter-pylori-urease-and-its-inhibition-by-hydroxamic-acids
#3
Richa Arora, Upasana Issar, Rita Kakkar
Hydroxamic acids have emerged as the most promising candidates from among the different classes of inhibitors of urease. In order to understand the mechanism of their action, we have studied in detail using quantum mechanics the active site of Helicobacter pylori urease complexed with acetohydroxamic acid. A diverse library of ligands having the hydroxamate moiety has been prepared and docked into the active site of urease using the QM/MM methodology. It is found that hydroxamic acids with hydrophobic groups attached to them are more potent inhibitors of urease because they can easily penetrate the hydrophobic environment surrounding the active site...
May 1, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29774942/-progress-and-controversy-on-diagnosis-and-treatment-of-gastric-stump-cancer
#4
Zhidong Gao, Yongbai Li, Kewei Jiang, Yingjiang Ye, Shan Wang
Gastric stump cancer (GSC) is a carcinoma arising from the remnant stomach following gastric surgery for benign or malignant disease, and is more common in men. The risk of morbidity has an obvious time dependence. GSC incidence is likely to rise with lengthening of the initial operation interval. The GSC time interval after malignant disease is significantly shorter than that of benign disease. GSC etiologies mainly include duodenogastric reflux and denervation of the gastric mucosa resulting in the change of the gastric environment after gastrectomy and the Helicobacter pylori infection...
May 25, 2018: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/29774929/-epidemiological-characteristics-and-inducing-factors-of-gastric-stump-cancer
#5
Lin Chen
Gastric stump cancer was initially defined as a carcinoma of the stomach occurring more than 5 years after surgery for gastric or duodenal benign disease. In recent years, as the number of total gastrectomy for benign disease has gradually decreased and the gastric cancer detection and operation rate have annually increased, residual recurrence of primary gastric cancer more than 10 years after gastric cancer surgery has also been considered as gastric stump cancer. The incidence of gastric stump cancer is increasing annually...
May 25, 2018: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
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
#6
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
#7
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
#8
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/29774138/clinical-evaluation-of-morgellons-disease-in-a-cohort-of-north-american-patients
#9
Melissa C Fesler, Marianne J Middelveen, Raphael B Stricker
Morgellons disease (MD) is a dermatological condition characterized by aberrant production of keratin and collagen fibers in skin. Although infection with Borrelia burgdorferi , the causative agent of Lyme disease (LD), has been associated with MD, relatively few studies have hitherto provided epidemiological evidence regarding this association. A cohort of 1000 seropositive North American LD patients was evaluated for the presence of MD. Patients were diagnosed with MD based on detection of microscopic fibers in skin lesions or under unbroken skin...
April 23, 2018: Dermatology Reports
https://www.readbyqxmd.com/read/29774087/severity-of-gastric-mucosal-atrophy-affects-the-healing-speed-of-post-endoscopic-submucosal-dissection-ulcers
#10
Taketo Otsuka, Mitsushige Sugimoto, Hiromitsu Ban, Toshiro Nakata, Masaki Murata, Atsushi Nishida, Osamu Inatomi, Shigeki Bamba, Akira Andoh
AIM: To investigate factors associated with the healing of endoscopic submucosal dissection (ESD)-induced ulcers. METHODS: We enrolled 132 patients with gastric tumors scheduled for ESD. Following ESD, patients were treated with daily lansoprazole 30 mg or vonoprazan 20 mg. Ulcer size was endoscopically measured on the day after ESD and at 4 and 8 wk. The gastric mucosa was endoscopically graded according to the Kyoto gastritis scoring system. We assessed the number of patients with and without a 90% reduction in ulcer area at 4 wk post-ESD and scar formation at 8 wk, and looked for risk factors for slower healing...
May 16, 2018: World Journal of Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/29773406/dynamics-of-helicobacter-pylori-infection-in-infants-during-the-first-six-months-of-life
#11
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/29770171/risk-of-gastric-cancer-development-after-eradication-of-helicobacter-pylori
#12
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
#13
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
#14
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/29767194/qm-mm-simulations-identify-the-determinants-of-catalytic-activity-differences-between-type-ii-dehydroquinase-enzymes
#15
Emilio Lence, Marc W van der Kamp, Concepción González-Bello, Adrian J Mulholland
Type II dehydroquinase enzymes (DHQ2), recognized targets for antibiotic drug discovery, show significantly different activities dependent on the species: DHQ2 from Mycobacterium tuberculosis (MtDHQ2) and Helicobacter pylori (HpDHQ2) show a 50-fold difference in catalytic efficiency. Revealing the determinants of this activity difference is important for our understanding of biological catalysis and further offers the potential to contribute to tailoring specificity in drug design. Molecular dynamics simulations using a quantum mechanics/molecular mechanics potential, with correlated ab initio single point corrections, identify and quantify the subtle determinants of the experimentally observed difference in efficiency...
May 16, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29767036/response-to-comment-on-first-line-helicobacter-pylori-eradication-with-vonoprazan-clarithromycin-and-metronidazole-in-patients-allergic-to-penicillin
#16
COMMENT
Soichiro Sue, Nobumi Suzuki, Wataru Shibata, Tomohiko Sasaki, Hiroaki Yamada, Hiroaki Kaneko, Toshihide Tamura, Tomohiro Ishii, Masaaki Kondo, Shin Maeda
No abstract text is available yet for this article.
2018: Gastroenterology Research and Practice
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
#17
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
#18
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/29765934/autoimmune-gastritis-in-the-pediatric-age-an-underestimated-condition-report-of-two-cases-and-review
#19
Chiara Saglietti, Amedeo Sciarra, Karim Abdelrahman, Vanessa Schneider, Arti Karpate, Andreas Nydegger, Christine Sempoux
Background: Diagnosis of pediatric autoimmune gastritis (AIG) in children is important due to poor outcome and risk of malignancy. This condition is often underestimated in the clinico-pathologic diagnostic work-up, leading to delayed time-to-diagnosis. To increase the awareness of this condition in the pediatric population, we present two cases encountered at our institution, discuss their clinical, biological, and histological presentations in relation with evidence from the literature, and propose an algorithm for diagnosis and follow-up of AIG in children...
2018: Frontiers in Pediatrics
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
#20
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
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