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Garrett Z Ng, Bi-Xia Ke, Adrienne Laskowski, David R Thorburn, Philip Sutton
BACKGROUND: Complex I is the first enzyme complex in the mitochondrial respiratory chain, responsible for generating a large fraction of energy during oxidative phosphorylation. Recently, it has been identified that complex I deficiency can result in increased inflammation due to the generation of reactive oxygen species by innate immune cells. As a reduction in complex I activity has been demonstrated in human stomachs with atrophic gastritis, we investigated whether complex I deficiency could influence Helicobacter pylori pathogenesis...
February 9, 2017: Helicobacter
Antonio Tursi, Francesco Di Mario, Marilisa Franceschi, Rudi De Bastiani, Walter Elisei, Gianluca Baldassarre, Antonio Ferronato, Simone Grillo, Stefano Landi, Maria Zamparella, Manuela De Polo, Laura Boscariolo, Marcello Picchio
BACKGROUND: Rising antibiotic resistance requires the evaluation of new and effective therapies. AIMS: To test the efficacy and safety of the new bismuth-containing quadruple therapy in patients infected with Helicobacter pylori. MATERIAL AND METHODS: Consecutive H. pylori-positive dyspeptic patients were enrolled, either naïve or with previous failure treatment. Patients were treated with Pylera(®) (three-in-one capsules containing bismuth subcitrate potassium 140 mg, metronidazole 125 mg, and tetracycline 125 mg) three capsules q...
January 26, 2017: Helicobacter
Tae Jun Kim, Eun Ran Kim, Dong Kyung Chang, Young-Ho Kim, Sun-Young Baek, Kyunga Kim, Sung Noh Hong
BACKGROUND: The role of Helicobacter pylori (H. pylori) in the development of colorectal neoplasm remains controversial. We examined the association between H. pylori infection and colorectal neoplasm in a large sample of healthy participants who underwent screening colonoscopy. METHODS: A cross-sectional study of 8916 men, who participated in a regular health-screening examination that included an H. pylori-specific immunoglobulin G antibody test and colonoscopy, was conducted to evaluate the association between H...
January 26, 2017: Helicobacter
Iris Bosschem, Bram Flahou, Kim Van Deun, Stefaan De Koker, Jiri Volf, Annemieke Smet, Richard Ducatelle, Bert Devriendt, Freddy Haesebrouck
BACKGROUND: Helicobacter (H.) suis is mainly associated with pigs, but is also the most prevalent gastric non-H. pylori Helicobacter species found in humans. Both H. pylori and H. suis may cause persistent infection of the stomach. Several immune evasion mechanisms have been proposed for H. pylori, which focus to a great extent on its major virulence factors, which are absent in H. suis. The aim of this study was to gain more knowledge on immune evasion by H. suis. MATERIALS AND METHODS: Cytokine expression kinetics were monitored in the stomach of BALB/c mice experimentally infected with H...
January 26, 2017: Helicobacter
Shingo Tanaka, Hiroyuki Nagashima, Takahiro Uotani, David Y Graham, Yoshio Yamaoka
BACKGROUND: In vitro studies have shown that Helicobacter pylori (H. pylori) infection induces autophagy in gastric epithelial cells. However, prolonged exposure to H. pylori reduces autophagy by preventing maturation of the autolysosome. The alterations of the autophagy-related genes in H. pylori infection are not yet fully understood. MATERIALS AND METHODS: We analyzed autophagy-related gene expression in H. pylori-infected gastric mucosa compared with uninfected gastric mucosa obtained from 136 Bhutanese volunteers with mild dyspeptic symptoms...
January 23, 2017: Helicobacter
Shoko Ono, Mototsugu Kato, Soichi Nakagawa, Katsuhiro Mabe, Naoya Sakamoto
BACKGROUND: Although all Helicobacter pylori (H. pylori)-positive patients should receive eradication therapy, the therapy is a challenge for patients allergic to penicillin. There have been a few reports on the efficacy of eradication therapy for such patients. OBJECTIVE: To analyze the efficacy of vonoprazan or proton pump inhibitor (PPI)-based 7-day triple therapy in patients allergic to penicillin. MATERIALS AND METHODS: A total of 88 consecutive patients allergic to penicillin who received H...
January 18, 2017: Helicobacter
Samantha Morais, Ana Rute Costa, Ana Ferro, Nuno Lunet, Bárbara Peleteiro
BACKGROUND: A rapid growth in the number of international migrants over the past years has occurred with most traveling to more affluent settings. As Helicobacter pylori infects over half of the adult population and its prevalence is higher in developing countries, understanding the prevalence of infection in migrants can provide insight into future trends in the burden and management of infection. We aimed to describe the prevalence of H. pylori among migrants through a systematic literature review...
January 18, 2017: Helicobacter
Lan Li, Yini Ke, Chaohui Yu, Guogang Li, Ningmin Yang, Jianzhong Zhang, Youming Li
BACKGROUND: To determine the prevalence of resistance to metronidazole, clarithromycin, levofloxacin, amoxicillin, and furazolidone in Helicobacter pylori isolated from Chinese children. MATERIALS AND METHODS: This multicenter retrospective study was conducted from January 2009 to December 2015. A total of 1746 isolates of H. pylori were collected from nine areas of Zhejiang province in the southeast coastal region of China. H. pylori strains were examined for antibiotics susceptibility by agar dilution method...
January 18, 2017: Helicobacter
Bor-Shyang Sheu, Ming-Shiang Wu, Cheng-Tang Chiu, Jing-Chuan Lo, Deng-Chyang Wu, Jyh-Ming Liou, Chun-Ying Wu, Hsiu-Chi Cheng, Yi-Chia Lee, Ping-I Hsu, Chun-Chao Chang, Wei-Lun Chang, Jaw-Town Lin
BACKGROUND: Previous international consensus statements provided general policies for the management of Helicobacter pylori infection. However, there are geographic differences in the prevalence and antimicrobial resistance of H. pylori, and in the availability of medications and endoscopy. Thus, nationwide or regional consensus statements are needed to improve control of H. pylori infection and gastric cancer. MATERIALS AND METHODS: This consensus statement for management of H...
January 8, 2017: Helicobacter
Amnon Sonnenberg, Evan S Dellon, Kevin O Turner, Robert M Genta
BACKGROUND: Environmental factors associated with ethnicity may contribute to the occurrence of eosinophilic esophagitis. Our study aimed to investigate the influence of Helicobacter pylori on the ethnic variation of esophageal eosinophilia in a large national sample of patients undergoing esophago-gastro-duodenoscopy. METHODS: The Miraca Life Sciences Database is an electronic repository of histopathologic patient records. A case-control study evaluated the influence of ethnicity on the occurrence of esophageal eosinophilia and how age, gender, and histologic diagnosis of H...
December 28, 2016: Helicobacter
Caroline Blaecher, Eva Bauwens, Alfred Tay, Fanny Peters, Sylvia Dobbs, John Dobbs, André Charlett, Richard Ducatelle, Freddy Haesebrouck, Annemieke Smet
BACKGROUND: Helicobacter suis is a very fastidious microorganism associated with gastritis, gastric ulcers, and mucosa-associated lymphoid tissue lymphoma in humans. In vitro isolation of this agent from human patients has so far been unsuccessful. MATERIALS AND METHODS: A probe-based real-time PCR (RT-PCR) for the rapid detection of H. suis in gastric biopsies was developed. Secondly, a mouse-passage-based protocol was optimized for isolation of low numbers of viable H...
December 28, 2016: Helicobacter
Seyedeh Azra Shamsdin, Abdolvahab Alborzi, Manoochehr Rasouli, Abbas Ghaderi, Kamran B Lankrani, Seyed Mohsen Dehghani, Gholam Reza Pouladfar
BACKGROUND: An association exists between Helicobacter pylori (H. pylori), peptic ulcers, gastritis, and sometimes gastric carcinomas. Th22 cells have protective and inflammatory roles in defense against microbes. AIM: We investigated the frequencies of Th22, Tc22, Th22/17, and Tc22/17 cells in addition to the changes in levels of cytokines IL-22, IL-6, IL-23, TNF-α, IL-1β, and TGF-β in sera from patients with H. pylori-associated gastritis, and peptic ulcer, and in uninfected patients...
December 19, 2016: Helicobacter
Xia Sun, Min Zhang, Mohamad El-Zaatari, Gray B Huffnagle, John Y Kao
BACKGROUND: We previously demonstrated that H. pylori infection leads to increased induction of regulatory T cells in local and systemic immune compartments. Here, we investigate the role of CCR2 in the tolerogenic programing of dendritic cells in a mouse model of H. pylori infection. MATERIALS AND METHODS: CCR2 deficient (CCR2KO) mice and wild-type (Wt) mice infected with H. pylori SS1 strain were analyzed by qPCR and FACS analysis. In vitro, bone marrow-derived DC on day 6 from CCR2KO and Wt mice cocultured with or without H...
December 8, 2016: Helicobacter
Stanisław Ferenc, Jan Gnus, Magdalena Kościelna, Małgorzata Kinda, Andriy Yarka, Luke Stewart, Wojciech Witkiewicz
BACKGROUND: At present, the resistance to antibiotics is considered the most important reason for Helicobacter pylori (HP) eradication failure. The aim of this study was to estimate the prevalence of antimicrobial resistance of HP strains and to evaluate tailored and empiric therapeutic regimens in patients with peptic ulcer disease associated with infection of this microorganism. MATERIALS AND METHODS: Between May 2011 and February 2013, 185 consecutive Polish patients with at least one positive Helicobacter pylori test (urease test, histopathologic examination, and/or culture) underwent eradication therapy...
November 23, 2016: Helicobacter
Lauren Hudak, Ameen Jaraisy, Saeda Haj, Khitam Muhsen
BACKGROUND: We conducted an updated systematic review and meta-analysis to examine the prevalence of depleted iron stores among persons infected with Helicobacter pylori compared to uninfected ones. We also assessed the impact of anti-H. pylori eradication therapy plus iron therapy on ferritin and hemoglobin levels compared to iron therapy alone. METHODS: A literature search was conducted using the databases Medline, the Cochrane Library, Cochrane Central Register of Controlled Trials, EMBASE, and the Science Citation Index Expanded...
February 2017: Helicobacter
Katushiro Mabe, Shogo Kikuchi, Masumi Okuda, Mitsuharu Takamasa, Mototsugu Kato, Masahiro Asaka
BACKGROUND: To prevent gastric cancer, a Helicobacter pylori test-and-treat strategy has been proposed. In Japan, routine urine examinations are performed to screen for kidney diseases; it is therefore convenient to screen for H. pylori infection via urine antibody (u-Ab) testing. AIM: To evaluate the diagnostic accuracy of u-Ab testing in students using (13) C-urea breath testing (UBT) as a standard. METHODS: The study population included 806 junior or senior high school students in Japan who provided urine samples and/or underwent UBT...
February 2017: Helicobacter
Thomas Regnath, Olaf Raecke, Axel Enninger, Ralf Ignatius
BACKGROUND: Increasing antibiotic resistance has been reported for Helicobacter pylori, but data on the prevalence of antibiotic resistance of H. pylori in pediatric patients and the development of resistance over time are sparse. METHODS: Data for 610 H. pylori isolates obtained between 2002 and 2015 from gastric biopsies of 582 (mainly treatment-naïve) pediatric patients from southwest Germany were analyzed retrospectively regarding the antibiotic susceptibility determined by Etest and patients' characteristics...
February 2017: Helicobacter
Martha Pérez-Rodríguez, Oswaldo Partida-Rodríguez, Margarita Camorlinga-Ponce, Lourdes Flores-Luna, Eduardo Lazcano, Alejandro Gómez, Roberto Herrera-Goepfert, Rafael Medrano-Guzmán, Javier Torres
BACKGROUND: Polymorphisms in inflammation-related genes are factors associated with the development of gastroduodenal diseases in Helicobacter pylori-infected individuals. MATERIALS AND METHODS: We aimed to analyze polymorphisms in HLA-DQ, together with other host and H. pylori variables as risk factors for precancerous and cancerous gastric lesions. 1052 individuals were studied, including nonatrophic gastritis (NAG), intestinal metaplasia (IM), gastric cancer (GC) or duodenal ulcer (DU) patients, and healthy volunteers...
February 2017: Helicobacter
Sinéad M Smith, Michael Freeley, Paul N Moynagh, Dermot P Kelleher
BACKGROUND: Eradication rates for current H. pylori therapies have fallen in recent years, in line with the emergence of antibiotic resistant infections. The development of therapeutic alternatives to antibiotics, such as immunomodulatory therapy and vaccines, requires a more lucid understanding of host-pathogen interactions, including the relationships between the organism and the innate immune response. Pellino proteins are emerging as key regulators of immune signaling, including the Toll-like receptor pathways known to be regulated by H...
February 2017: Helicobacter
You-Hua Wang, Zhi-Fa Lv, Yao Zhong, Dong-Sheng Liu, Shu-Ping Chen, Yong Xie
BACKGROUND: Helicobacter pylori (H. pylori) internalization involves invasion of cells by the bacterium. Several studies have shown that H. pylori can invade human gastric epithelial cells, immune cells, and Candida yeast in vivo and in vitro. Whether bacterial invasion plays a role in eradication failure is unclear. AIM: To investigate the relationship between H. pylori invasion of GES-1 cells and H. pylori eradication failure. MATERIALS AND METHODS: Forty-two clinical strains isolated from H...
February 2017: Helicobacter
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