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Helicobacter and gastric cancer

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https://www.readbyqxmd.com/read/29155519/quantitative-changes-of-gastric-mucosa-during-carcinogenesis-using-stereological-methods
#1
Zahra Heidari, Hamidreza Mahmoudzadeh-Sagheb, Mahdieh Narouei
PURPOSE: To investigate the effects of helicobacter pylori (H. pylori) infection on the quantitative changes of gastric mucosa in cancerous and precancerous lesions using stereological methods. METHODS: One hundred and twenty-two gastric samples were studied. After determination of H. pylori infection, 42 gastric tissues of intestinal metaplasia (IM) patients, 38 specimens from dysplasia (DYS), and 42 specimens from gastric cancer (GC) types were selected from the pathology archive of Imam Ali Hospital, Zahedan, Iran...
July 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29154808/genetic-host-factors-in-helicobacter-pylori-induced-carcinogenesis-emerging-new-paradigms
#2
REVIEW
Michiel C Mommersteeg, Jun Yu, Maikel P Peppelenbosch, Gwenny M Fuhler
Helicobacter Pylori is a gram negative rod shaped microaerophilic bacterium that colonizes the stomach of approximately half the world's population. Infection with c may cause chronic gastritis which via a quite well described process known as Correas cascade can progress through sequential development of atrophic gastritis, intestinal metaplasia and dysplasia to gastric cancer. H. pylori is currently the only bacterium that is classified as a class 1 carcinogen by the WHO, although the exact mechanisms by which this bacterium contributes to gastric carcinogenesis are still poorly understood...
November 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29151783/gastric-microbiota-tracing-the-culprit
#3
REVIEW
Cristian Vasile Petra, Aronel Rus, Dan Lucian Dumitraşcu
The gastric environment has been long time considered bacteria-free, but the discovery of Helicobacter pylori (H. pylori) in 1982 superseded this conception. Over the last decades new diagnostic methods have been developed, starting with culture-dependent and advancing to culture-independent ones. These modern techniques provide new insight into the composition and influence of this ecosystem on the entire gastrointestinal tract. H. pylori is no longer considered the only microorganism in the stomach, other non-H...
2017: Clujul Medical (1957)
https://www.readbyqxmd.com/read/29148176/differential-proteomic-analysis-reveals-protein-networks-and-pathways-that-may-contribute-to-helicobacter-pylori-fkbp-type-ppiase-associated-gastric-diseases
#4
Yanmei Zhu, Yuehua Gong, Aodi Li, Moye Chen, Dan Kang, Jun Liu, Yuan Yuan
PURPOSE: Though Helicobacter pylori (H. pylori) has been classified as class I carcinogen, key virulence factor generated by H. pylori that causes gastric cancer remains to be fully determined. Recently, we identified a gastric cancer-associated H. pylori gene, peptidylprolyl isomerase-FK506 binding protein (PPIase-FKBP), and showed that PPIase-FKBP was capable of inducing oncogenic transformation of gastric epithelial cells. But its mechanism was unclear. EXPERIMENTAL DESIGN: We carried out a comparative proteomic analysis of human gastric epithelial cells that either express PPIase-FKBP or green fluorescent protein (GFP) using two-dimensional (2-D) gel electrophoresis and then matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS/MS)...
November 16, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/29138921/world-trends-for-h-pylori-eradication-therapy-and-gastric-cancer-prevention-strategy-by-h-pylori-test-and-treat
#5
REVIEW
Hidekazu Suzuki, Hideki Mori
Helicobacter pylori-associated gastritis leads to the development of gastric cancer. Kyoto global consensus report on H. pylori gastritis recommended H. pylori eradication therapy to prevent gastric cancer. To manage H. pylori infection, it is important to choose the appropriate regimen considering regional differences in resistance to clarithromycin and metronidazole. Quinolones and rifabutin-containing regimens are useful as third- and fourth-line rescue therapies.
November 14, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/29138645/chinese-classical-formula-sijunzi-decoction-and-chronic-atrophic-gastritis-evidence-for-treatment-approach
#6
REVIEW
Danan Gan, Aili Xu, Hongbo Du, Yong'an Ye
Objective: This aim is to evaluate the effect of Sijunzi decoction (SJZD) treating chronic atrophic gastritis (CAG). Methods: We performed searches in seven databases. The randomized controlled trials (RCTs) comparing SJZD with standard medical care or inactive intervention for CAG were enrolled. Combined therapy of SJZD plus conventional therapies compared with conventional therapies alone was also retrieved. The primary outcome included the incidence of gastric cancer and the improvement of atrophy, intestinal metaplasia, and dysplasia based on the gastroscopy and pathology...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29138530/group-2-innate-lymphoid-cells-are-involved-in-skewed-type-2-immunity-of-gastric-diseases-induced-by-helicobacter-pylori-infection
#7
Rong Li, Xiao-Xia Jiang, Lin-Fang Zhang, Xiao-Ming Liu, Ting-Zi Hu, Xiu-Juan Xia, Ming Li, Can-Xia Xu
H. pylori induces a complicated local and systematic immune response and contributes to the carcinogenesis of gastric cancer. A primary type 1 immune response is evoked by H. pylori since its occurrence. However, it is not unusual that an inhibitory immunity is dominant in H. pylori-associated diseases, which are promoted by the formation of immunosuppressive microenvironment. But whether group 2 innate lymphoid cells (ILC2s) plays a critical role in H. pylori-induced skewed type 2 immunity is still unclear...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/29138097/gastric-microbiota-an-emerging-player-in-helicobacter-pylori-induced-gastric-malignancies
#8
J Luis Espinoza, Ayumi Matsumoto, Hirokazu Tanaka, Itaru Matsumura
The complex diversity of nonpathogenic microbes that colonize the human body, known as microbiota, exert considerable effects on physiological homeostasis, and immune regulation. Helicobacter pylori (H. pylori) is a bacterium that frequently colonizes human stomach and is a major pathogenic agent for peptic ulcer diseases, gastric cancer, and mucosa-associated lymphoid tissue (MALT) lymphoma. Due to its acidic pH and peristaltic movements, the stomach has been considered a hostile environment for most microorganisms, however various commensal microorganisms are capable of colonizing the stomach to form a stomach niche...
November 11, 2017: Cancer Letters
https://www.readbyqxmd.com/read/29132476/helicobacter-pyloriassociation-with-expression-of-cdx2-in-intestinal-metaplasia
#9
Tayyab Hamid Malik, WangYu, XuHong
OBJECTIVE: To assess whether helicobacter pylori was associated with CDX2 expression in intestinal metaplasia, atrophic gastritis, dysplasia and gastric cancer. STUDY DESIGN: Cross-sectional study. PLACE AND DURATION OF STUDY: Department of Pathology, The First Hospital of Jilin University, Changchun, China, from August 2016 to January 2017. METHODOLOGY: CDX2 expression was evaluated in 62 gastric antral biopsies; including 32 cases of intestinal metaplasia (IM) and 10 cases each of atrophic gastritis (AG), dysplasia and gastric cancer...
November 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/29128564/epigenetic-mechanisms-of-atm-activation-after-helicobacter-pylori-infection
#10
Juliana Carvalho Santos, Rafael Zuppardo Gambeloni, Aline Tengan Roque, Sebastian Oeck, Marcelo Lima Ribeiro
Gastric cancer (GC) is the second leading cause of cancer-related mortality worldwide. The disease develops from the accumulation of several genetic and epigenetic changes. Among other risk factors, Helicobacter pylori infection is considered the main driving factor of GC development. H. pylori infection increases DNA damage levels and leads to epigenetic dysregulation, which may favor gastric carcinogenesis. An early step in double strand break repair is the recruitment of (ataxia-telangiectasia mutated serine/threonine kinase (ATM) to the damaged site, where it plays a key role in advancing the DNA damage checkpoint process...
November 8, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29125621/phenolic-composition-and-evaluation-of-the-antimicrobial-activity-of-free-and-bound-phenolic-fractions-from-a-peruvian-purple-corn-zea-mays-l-accession
#11
Lena Gálvez Ranilla, Ashish Christopher, Dipayan Sarkar, Kalidas Shetty, Rosana Chirinos, David Campos
Beneficial effects on overall gut health by phenolic bioactives-rich foods are potentially due to their modulation of probiotic gut bacteria and antimicrobial activity against pathogenic bacteria. Based on this rationale, the effect of the free and bound phenolic fractions from a Peruvian purple corn accession AREQ-084 on probiotic lactic acid bacteria such as Lactobacillus helveticus and Bifidobacterium longum and the gastric cancer-related pathogen Helicobacter pylori was evaluated. The free and bound phenolic composition was also determined by ultra-performance liquid chromatography...
November 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29113265/cdx2-is-involved-in-microrna-associated-inflammatory-carcinogenesis-in-gastric-cancer
#12
Motonobu Saito, Hirokazu Okayama, Katsuharu Saito, Jin Ando, Kensuke Kumamoto, Izumi Nakamura, Shinji Ohki, Yoshimasa Ishi, Seiichi Takenoshita
The development of gastric cancer is significantly associated with chronic inflammation, such as caused by Helicobacter pylori (H. pylori) infection. Caudal-type homeobox 2 (CDX2) is a homeobox protein involved in intestinal differentiation in normal and in aberrant locations, and is associated with inflammation. The authors of the present study have previously reported that CDX2 may have a suppressive role in the progression and carcinogenesis of gastric carcinoma. In the present study, the authors initially confirmed that a decreased expression of CDX2, as detected by immunohistochemistry, is associated with poor cancer-specific survival in 210 gastric cancer cases, which is consistent with several previously published studies...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29113260/expression-of-c-met-and-hepatocyte-growth-factor-in-various-gastric-pathologies-and-its-association-with-helicobacter-pylori-infection
#13
Chuan Xie, Zhen Yang, Yi Hu, Ximei Cao, Jiang Chen, Yin Zhu, Nonghua Lu
Activation of the hepatocyte growth factor (HGF)/c-Met signaling pathway was identified to be associated with malignant tumors. The present study aimed at determining the expression of HGF and c-Met in gastric carcinogenesis and its association with Helicobacter pylori infection. Gastric biopsies were obtained from 160 H. pylori-negative and -positive patients, including those with chronic gastritis, intestinal metaplasia, dysplasia and gastric cancer (GC). Proteins were extracted from GES-1, gastric epithelial, and AGS, gastric adenocarcinoma, cells following co-culture with H...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29113180/helicobacter-pylori-modulates-cyclooxygenase-2-and-15-hydroxy-prostaglandin-dehydrogenase-in-gastric-cancer
#14
Jianqiu Zhao, Shujun Wen, Xingfen Wang, Zhiguang Zhang
Persistent infection with Helicobacter pylori may contribute to the carcinogenesis of gastric cancer through modulating local prostaglandin E2 (PGE2) levels. Cyclooxygenase-2 (COX-2) and 15-hydroxy prostaglandin dehydrogenase (15-PGDH) are two key enzymes that regulate PGE2 synthesis and inactivation, respectively. The present study was designed to investigate the expression of COX-2 and 15-PGDH in gastric cancer specimens (n=66) in comparison to that of control specimens (n=70) and, furthermore, to semi-quantitatively assess the level of COX-2 and 15-PGDH mRNA and protein in tissues with or without H...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29110085/safety-of-first-line-triple-therapy-with-a-potassium-competitive-acid-blocker-for-helicobacter-pylori-eradication-in-children
#15
Chika Kusano, Takuji Gotoda, Sho Suzuki, Hisatomo Ikehara, Mitsuhiko Moriyama
BACKGROUND: Helicobacter pylori infection is a risk factor for gastric cancer, and it has been reported that eradication of H. pylori is effective for preventing such cancer. Recently, H. pylori eradication has been performed in children as first-line therapy against gastric cancer. Here, we report use of triple therapy with a potassium-competitive acid blocker (P-CAB) for H. pylori eradication in children. METHODS: H. pylori infection testing and eradication therapy began in fiscal year 2015 in junior high school students located in Yurihonjo city and Nikaho city, Akita prefecture, Japan...
November 7, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/29108340/positive-helicobacter-pylori-status-is-associated-with-better-overall-survival-for-gastric-cancer-patients-evidence-from-case-cohort-studies
#16
Xuqian Fang, Kun Liu, Jialin Cai, Fangxiu Luo, Fei Yuan, Peizhan Chen
Helicobacter pylori (H. pylori) infection increases the gastric cancer risk; however, the influences of H. pylori infection status on the outcomes for gastric cancer patients have not yet clearly defined. Herein, we systematically assessed the epidemiological studies regarding the associations between the H.pylori infection status at diagnosis and the prognosis for gastric cancer patients with the meta-analysis methods. Thirty-three eligibility studies with 8,199 participants that had determined the H.pylori infection status and the outcomes for gastric cancer patients were identified through searching the PubMed and MEDLINE databases updated to March 1(st), 2017...
October 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29108235/regulation-of-sirt3-signal-related-metabolic-reprogramming-in-gastric-cancer-by-helicobacter-pylori-oncoprotein-caga
#17
Do Yeon Lee, Dawoon E Jung, Sung Sook Yu, Yeo Song Lee, Beom Ku Choi, Yong Chan Lee
Injection of the Helicobacter pylori cytotoxin-associated gene A (CagA) is closely associated with the development of chronic gastritis and gastric cancer. Individuals infected with H. pylori possessing the CagA protein produce more reactive oxygen species (ROS) and show an increased risk of developing gastric cancer. Sirtuins (SIRTs) are nicotinamide adenine dinucleotide (NAD(+))-dependent deacetylases and mitochondrial SIRT3 is known to be a tumor suppressor via its ability to suppress ROS and hypoxia inducible factor 1α (HIF-1α)...
October 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29107816/long-term-follow-up-of-the-incidence-of-helicobacter-pylori
#18
Marion Rowland, Marguerite Clyne, Leslie Daly, Humphrey O'Connor, Billy Bourke, Gerard Bury, Tom O' Dowd, Lucy Connolly, James Ryan, Stephen Shovlin, Brendan Dolan, Brendan Drumm
OBJECTIVES: Helicobacter pylori (H. pylori) causes peptic ulcer disease and gastric cancer. Understanding the incidence of H. pylori could help guide research on potential infection prevention strategies. Previous studies indicate infection occurs in young children, but the risk of infection in older children and adolescents is unclear. Our hypothesis was that H. pylori infection is rare in adolescence or adulthood. Our aim was to determine the incidence of H. pylori over a prolonged follow-up in a cohort of 626 non-infected individuals...
October 28, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29106933/prediction-of-host-pathogen-interactions-for-helicobacter-pylori-by-interface-mimicry-and-implications-to-gastric-cancer
#19
Emine Guven-Maiorov, Chung-Jung Tsai, Buyong Ma, Ruth Nussinov
There is a strong correlation between some pathogens and certain cancer types. One example is Helicobacter pylori and gastric cancer. Exactly how they contribute to host tumorigenesis is however a mystery. Pathogens often interact with the host through proteins. To subvert defense, they may mimic host proteins at the sequence, structure, motif or interface levels. Interface similarity permits pathogen proteins to compete with those of the host for a target protein, and thereby alter the host signaling. Detection of host-pathogen interactions (HPIs) and mapping the re-wired superorganism HPI network - with structural details - can provide unprecedented clues to the underlying mechanisms and help therapeutics...
October 26, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29106533/ywhae-is-a-novel-interaction-partner-of-helicobacter-pylori-caga
#20
Xiaoyan Zhang, Bangwei Zeng, Chunyan Wen, Shurong Zheng, Hao Chen, Feifei She
CagA, an important virulence factor of Helicobacter pylori, targets and interacts with a series of host proteins to activate signaling factors involved in many functions, such as development, cytoskeleton rearrangement, and inflammatory molecule release. Despite extensive efforts, the relationship between CagA and gastric cancer is far from completely understood. Here, the GAL4 yeast two-hybrid system was used to screen cellular proteins for binding to CagA, and five cellular proteins, including tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein, epsilon (YWHAE), were identified...
November 2, 2017: FEMS Microbiology Letters
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