Immune Response in H. pylori-Associated Gastritis and Gastric Cancer.

Immune Response in H. pylori-Associated Gastritis and Gastric Cancer. Gastroenterol Res Pract. 2020;2020:9342563 Authors: Niu Q, Zhu J, Yu X, Feng T, Ji H, Li Y, Zhang W, Hu B Abstract Helicobacter pylori (H. pylori) is the dominant member of the gastric microbiota and has infected more than half of the human population, of whom 5-15% develop gastric diseases ranging from gastritis and metaplasia to gastric cancer. These diseases always follow inflammation induced by cell surface and intracellular receptors and subsequent signaling, such as the NF-κB pathway and inflammasomes. Some types of immune cells are recruited to enforce an antibacterial response, which could be impeded by H. pylori virulence factors with or without a specific immune cell. Following decreased inflammation, neoplasm may appear with a little immune surveillance and may inhibit antitumor immunity. Therefore, the balance between H. pylori-associated inflammation and anti-inflammation is crucial for human health and remains to be determined. Here, we discuss multiple inflammation and immunoregulatory cells in gastritis and summarize the main immune evasion strategies employed by gastric cancer. PMID: 32411209 [PubMed]
Source: Gastroenterology Research and Practice - Category: Gastroenterology Tags: Gastroenterol Res Pract Source Type: research

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The analysis of the interaction between Helicobacter pylori (HP) and the host in vivo is an extremely informative way to enlighten the molecular mechanisms behind the persistency/latency of the bacterium as well as in the progression of the infection. An important source of information is represented by circulating antibodies targeting the bacteria that define a specific “disease signature” with prospective diagnostic implications. The diagnosis of some of the HP induced diseases such as gastric cancer (GC), MALT lymphoma (MALT), and autoimmune gastritis (AIG) is not easy because patients do not show symptoms o...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Authors: Zizzi CF, Pellicano R, Biancone L Abstract A number of studies has confirmed that the epidemiology of Helicobacter pylori (H. pylori) is changing worldwide, with a decrease especially in developed Countries. Nevertheless, since this Gram-negative bacterium infects almost 50% of the world's population, it remains a global problem. Beyond its role in the pathogenesis of the main gastroduodenal diseases, including gastritis, peptic ulcer and gastric cancer, H. pylori has been suspected to be involved in several extra-gastroduodenal disorders. Patients with chronic kidney disease (CKD) present gastric mucosal ...
Source: Minerva Gastroenterologica e Dietologica - Category: Gastroenterology Tags: Minerva Gastroenterol Dietol Source Type: research
This study is aiming at investigating the ...
Source: BMC Research Notes - Category: Research Authors: Tags: Research note Source Type: research
ConclusionChronic gastritis andH. pylori infection are risk factors for laryngeal carcinoma formation; therefore, acute gastritis with helicobacter pylori infection must be immediately treated to not let infection to become chronic.
Source: European Archives of Oto-Rhino-Laryngology - Category: ENT & OMF Source Type: research
In this study, we performed a genome-wide gene-expression analysis in gastric biopsies of patients chronically infected with H. pylori, using the potential of high-throughput technologies that have not been fully exploited in this area. Here we illustrate the potential correlation of H. pylori infection with the gene expression changes in follicular gastritis, chronic gastritis and intestinal metaplasia. We also suggest its potential as biomarkers of each condition. An exploratory set of 21 biopsies from patients with follicular gastritis, chronic gastritis, and intestinal metaplasia were analyzed by gene-expression microa...
Source: Journal of Cancer - Category: Cancer & Oncology Authors: Tags: Research Paper Source Type: research
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Source: Acta Gastro-Enterologica Belgica - Category: Gastroenterology Tags: Acta Gastroenterol Belg Source Type: research
CONCLUSION: The TNF-α -308 A allele has a promotive effect for GC progression, whereas the TNF-α -238 A allele has a protective function against GC progression. High levels of TNF-α seemed to be associated with the aggressiveness of gastric lesions. TNF-α gene polymorphisms and TNF-α serum levels might be helpful to select those patients who are at high risk for GC. PMID: 32592356 [PubMed - as supplied by publisher]
Source: Asian Pacific Journal of Cancer Prevention - Category: Cancer & Oncology Tags: Asian Pac J Cancer Prev Source Type: research
Disruption in the epigenetic mechanisms is one of the causes of cancer; particularly in the gut. It has been elucidated that multiple genetic and epigenetic alterations during this process caused by chronic inflammation play a crucial role in the cancer progress. DNA methylation impairment as a leading change is caused during the proliferation of Helicobacter pylori. It has been unraveled that numerous tumor suppressor genes are regulated by related promoter methylation, justifying environmental factors inducing gastric carcinoma. H. pylori infection affects various cells through inflammation, changes in apoptosis, prolife...
Source: Reviews in Medical Microbiology - Category: Microbiology Tags: BACTERIOLOGY Source Type: research
Abstract The association of the H. pylori cagA- /cagE-positive genotypes with the risk of gastric cancer (GC) in Ardabil-a high-risk area in North-West Iran-was assessed. Genotyping was performed in DNA from fresh gastric biopsies (N = 218). Occurrence of H. pylori infection was 85.32% (186/218). The total frequency of the cagA+vs. cagA-, cagE+vs. cagE-, cagA+/cagE-vs. AGCs (all genotype combinations), cagA-/cagE+vs. AGCs, cagA-/cagE-vs. AGCs, cagA+/cagE+vs. AGCs, cagA+/cagE-vs. cagA-/cagE+, and cagA+/cagE+vs. cagA-/cagE- genotypes was 102/186 (54.8%), 89/186 (47.8%), 38/186 (20.4%), 25/186 (13.4), 59/186 (31....
Source: Infection, Genetics and Evolution - Category: Genetics & Stem Cells Authors: Tags: Infect Genet Evol Source Type: research
In conclusion, OMPs are closely related to the pathogenic processes of adhesion, colonization, persistent infection, and severe clinical consequences. They are potential targets for the prevention and treatment ofH. pylori–related diseases.
Source: European Journal of Clinical Microbiology and Infectious Diseases - Category: Microbiology Source Type: research
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