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World Journal of Gastroenterology Oct 2019() is a gram-negative bacterium that infects approximately 4.4 billion individuals worldwide. However, its prevalence varies among different geographic areas, and is... (Review)
Review
() is a gram-negative bacterium that infects approximately 4.4 billion individuals worldwide. However, its prevalence varies among different geographic areas, and is influenced by several factors. The infection can be acquired by means of oral-oral or fecal-oral transmission, and the pathogen possesses various mechanisms that improve its capacity of mobility, adherence and manipulation of the gastric microenvironment, making possible the colonization of an organ with a highly acidic lumen. In addition, presents a large variety of virulence factors that improve its pathogenicity, of which we highlight cytotoxin associated antigen A, vacuolating cytotoxin, duodenal ulcer promoting gene A protein, outer inflammatory protein and gamma-glutamyl transpeptidase. The host immune system, mainly by means of a Th1-polarized response, also plays a crucial role in the infection course. Although most -positive individuals remain asymptomatic, the infection predisposes the development of various clinical conditions as peptic ulcers, gastric adenocarcinomas and mucosa-associated lymphoid tissue lymphomas. Invasive and non-invasive diagnostic methods, each of them with their related advantages and limitations, have been applied in detection. Moreover, bacterial resistance to antimicrobial therapy is a major challenge in the treatment of this infection, and new therapy alternatives are being tested to improve eradication. Last but not least, the development of effective vaccines against infection have been the aim of several research studies.
Topics: Antacids; Anti-Bacterial Agents; Bacterial Vaccines; Drug Resistance, Bacterial; Drug Therapy, Combination; Gastric Mucosa; Helicobacter Infections; Helicobacter pylori; Humans; Hydrogen-Ion Concentration; Probiotics; Proton Pump Inhibitors; Stomach Diseases; Treatment Outcome; Virulence Factors
PubMed: 31602159
DOI: 10.3748/wjg.v25.i37.5578 -
Gut Sep 2015To present results of the Kyoto Global Consensus Meeting, which was convened to develop global consensus on (1) classification of chronic gastritis and duodenitis, (2)... (Review)
Review
OBJECTIVE
To present results of the Kyoto Global Consensus Meeting, which was convened to develop global consensus on (1) classification of chronic gastritis and duodenitis, (2) clinical distinction of dyspepsia caused by Helicobacter pylori from functional dyspepsia, (3) appropriate diagnostic assessment of gastritis and (4) when, whom and how to treat H. pylori gastritis.
DESIGN
Twenty-three clinical questions addressing the above-mentioned four domains were drafted for which expert panels were asked to formulate relevant statements. A Delphi method using an anonymous electronic system was adopted to develop the consensus, the level of which was predefined as ≥80%. Final modifications of clinical questions and consensus were achieved at the face-to-face meeting in Kyoto.
RESULTS
All 24 statements for 22 clinical questions after extensive modifications and omission of one clinical question were achieved with a consensus level of >80%. To better organise classification of gastritis and duodenitis based on aetiology, a new classification of gastritis and duodenitis is recommended for the 11th international classification. A new category of H. pylori-associated dyspepsia together with a diagnostic algorithm was proposed. The adoption of grading systems for gastric cancer risk stratification, and modern image-enhancing endoscopy for the diagnosis of gastritis, were recommended. Treatment to eradicate H. pylori infection before preneoplastic changes develop, if feasible, was recommended to minimise the risk of more serious complications of the infection.
CONCLUSIONS
A global consensus for gastritis was developed for the first time, which will be the basis for an international classification system and for further research on the subject.
Topics: Anti-Bacterial Agents; Consensus; Duodenitis; Gastritis; Global Health; Helicobacter Infections; Helicobacter pylori; Humans; International Classification of Diseases; Internationality; Japan; Practice Guidelines as Topic; Surveys and Questionnaires
PubMed: 26187502
DOI: 10.1136/gutjnl-2015-309252 -
World Journal of Gastroenterology Aug 2014More than 50% of the world population is infected with Helicobacter pylori (H. pylori). The bacterium highly links to peptic ulcer diseases and duodenal ulcer, which was... (Review)
Review
More than 50% of the world population is infected with Helicobacter pylori (H. pylori). The bacterium highly links to peptic ulcer diseases and duodenal ulcer, which was classified as a group I carcinogen in 1994 by the WHO. The pathogenesis of H. pylori is contributed by its virulence factors including urease, flagella, vacuolating cytotoxin A (VacA), cytotoxin-associated gene antigen (Cag A), and others. Of those virulence factors, VacA and CagA play the key roles. Infection with H. pylori vacA-positive strains can lead to vacuolation and apoptosis, whereas infection with cagA-positive strains might result in severe gastric inflammation and gastric cancer. Numerous medicinal plants have been reported for their anti-H. pylori activity, and the relevant active compounds including polyphenols, flavonoids, quinones, coumarins, terpenoids, and alkaloids have been studied. The anti-H. pylori action mechanisms, including inhibition of enzymatic (urease, DNA gyrase, dihydrofolate reductase, N-acetyltransferase, and myeloperoxidase) and adhesive activities, high redox potential, and hydrophilic/hydrophobic natures of compounds, have also been discussed in detail. H. pylori-induced gastric inflammation may progress to superficial gastritis, atrophic gastritis, and finally gastric cancer. Many natural products have anti-H. pylori-induced inflammation activity and the relevant mechanisms include suppression of nuclear factor-κB and mitogen-activated protein kinase pathway activation and inhibition of oxidative stress. Anti-H. pylori induced gastric inflammatory effects of plant products, including quercetin, apigenin, carotenoids-rich algae, tea product, garlic extract, apple peel polyphenol, and finger-root extract, have been documented. In conclusion, many medicinal plant products possess anti-H. pylori activity as well as an anti-H. pylori-induced gastric inflammatory effect. Those plant products have showed great potential as pharmaceutical candidates for H. pylori eradication and H. pylori induced related gastric disease prevention.
Topics: Animals; Anti-Bacterial Agents; Anti-Inflammatory Agents; Gastritis; Helicobacter Infections; Helicobacter pylori; Humans; Phytotherapy; Plant Preparations; Plants, Medicinal; Treatment Outcome; Virulence; Virulence Factors
PubMed: 25132753
DOI: 10.3748/wjg.v20.i30.10368 -
Microbiology and Molecular Biology... Jun 2018Despite decades of effort, infections remain difficult to treat. Over half of the world's population is infected by , which is a major cause of duodenal and gastric... (Review)
Review
Despite decades of effort, infections remain difficult to treat. Over half of the world's population is infected by , which is a major cause of duodenal and gastric ulcers as well as gastric cancer. During chronic infection, localizes within the gastric mucosal layer, including deep within invaginations called glands; thanks to its impressive ability to survive despite the harsh acidic environment, it can persist for the host's lifetime. This ability to survive and persist in the stomach is associated with urease production, chemotactic motility, and the ability to adapt to the fluctuating environment. Additionally, biofilm formation has recently been suggested to play a role in colonization. Biofilms are surface-associated communities of bacteria that are embedded in a hydrated matrix of extracellular polymeric substances. Biofilms pose a substantial health risk and are key contributors to many chronic and recurrent infections. This link between biofilm-associated bacteria and chronic infections likely results from an increased tolerance to conventional antibiotic treatments as well as immune system action. The role of this biofilm mode in antimicrobial treatment failure and survival has yet to be determined. Furthermore, relatively little is known about the biofilm structure or the genes associated with this mode of growth. In this review, therefore, we aim to highlight recent findings concerning biofilms and the molecular mechanism of their formation. Additionally, we discuss the potential roles of biofilms in the failure of antibiotic treatment and in infection recurrence.
Topics: Animals; Anti-Bacterial Agents; Biofilms; Chronic Disease; Disease Models, Animal; Drug Resistance, Microbial; Gastric Mucosa; Helicobacter Infections; Helicobacter pylori; Humans; Recurrence
PubMed: 29743338
DOI: 10.1128/MMBR.00001-18 -
Clinical Microbiology Reviews Apr 2017Whipple's disease is a rare infectious disease that can be fatal if left untreated. The disease is caused by infection with , a bacterium that may be more common than... (Review)
Review
Whipple's disease is a rare infectious disease that can be fatal if left untreated. The disease is caused by infection with , a bacterium that may be more common than was initially assumed. Most patients present with nonspecific symptoms, and as routine cultivation of the bacterium is not feasible, it is difficult to diagnose this infection. On the other hand, due to the generic symptoms, infection with this bacterium is actually quite often in the differential diagnosis. The gold standard for diagnosis used to be periodic acid-Schiff (PAS) staining of duodenal biopsy specimens, but PAS staining has a poor specificity and sensitivity. The development of molecular techniques has resulted in more convenient methods for detecting infections, and this has greatly improved the diagnosis of this often missed infection. In addition, the molecular detection of has resulted in an increase in knowledge about its pathogenicity, and this review gives an overview of the new insights in epidemiology, pathogenesis, clinical manifestations, diagnosis, and treatment of infections.
Topics: Anti-Bacterial Agents; Humans; Tropheryma; Whipple Disease
PubMed: 28298472
DOI: 10.1128/CMR.00033-16 -
World Journal of Gastroenterology Dec 2022The stomach is a hostile environment for most microbes because strong gastric acid kills indigenous microorganisms. Thus, the mass of indigenous microbes detected by... (Review)
Review
The stomach is a hostile environment for most microbes because strong gastric acid kills indigenous microorganisms. Thus, the mass of indigenous microbes detected by traditional culturing method in a highly acidic stomach is reported to be very small. However, in a stomach with less acidity due to atrophic changes of the gastric mucosa, the number of live gastric microbiota dramatically increases and their composition changes. A probiotic is defined as a live microorganism that, when administered in adequate amounts, confers a health benefit on the host. The administration of probiotics to the stomach has thus far been considered impractical, mainly due to the strong acidity in the stomach. The identification of candidate probiotic strains with sufficient resistance to acidity and the ability to achieve close proximity to the gastric mucosa could enable the application of probiotics to the stomach. The utilization of probiotics alone for () infection significantly improves gastric mucosal inflammation and decreases the density of on the mucosa, although complete eradication of has not yet been demonstrated. The use of probiotics in combination with antimicrobial agents significantly increases the eradication rate, especially when the strains are resistant to antimicrobial agents. While has been considered the most important pathogenic bacterium for the development of gastric cancer, bacteria other than are also suggested to be causative pathogens that promote the development of gastric cancer, even after the eradication of . Increased non- Gram-negative bacteria in the stomach with weak acidity accompanying atrophic gastritis may perpetuate gastric mucosal inflammation and accelerate carcinogenic progression, even after eradication. Probiotics restore the acidity in this stomach environment and may therefore prevent the development of gastric cancer by termination of Gram-negative bacteria-induced inflammation. Functional dyspepsia (FD) is defined as the presence of symptoms that are thought to originate in the gastroduodenal region in the absence of any organic, systematic or metabolic diseases. Accumulating evidence has pointed out the duodenum as a target region underlying the pathophysiology of FD. A randomized placebo-controlled clinical trial using a probiotic strain (LG21) demonstrated a significant improving effect on major FD symptoms. One of the possible mechanisms of this effect is protection of the duodenal mucosa from injurious intestinal bacteria through the resolution of small intestinal bacterial over growth.
Topics: Humans; Stomach Neoplasms; Stomach; Helicobacter Infections; Gastritis; Dyspepsia; Microbiota; Helicobacter pylori; Probiotics; Inflammation; Randomized Controlled Trials as Topic
PubMed: 36620346
DOI: 10.3748/wjg.v28.i47.6702 -
La Tunisie Medicale 2023Helicobacter pylori infection is the most common infectious disease worldwide. It is associated with duodenal and gastric ulcer disease and the risk of gastric...
Helicobacter pylori infection is the most common infectious disease worldwide. It is associated with duodenal and gastric ulcer disease and the risk of gastric neoplasia. The management of helicobacter pylori infection currently represents a real challenge for clinicians, given the ever-increasing rate of resistance of Helicobacter pyolori to various antibiotics. In this consensus document, we present recommendations adapted to the Tunisian context, including indications for the detection of helicobacter pylori infection, indications for the use of different diagnostic methods, and a therapeutic strategy for the management of Helicobacter pylori infection.
Topics: Humans; Helicobacter Infections; Consensus; Helicobacter pylori; Anti-Bacterial Agents; Duodenum
PubMed: 38445398
DOI: No ID Found -
Nature Nov 2021Tissue maintenance and repair depend on the integrated activity of multiple cell types. Whereas the contributions of epithelial, immune and stromal cells in intestinal...
Tissue maintenance and repair depend on the integrated activity of multiple cell types. Whereas the contributions of epithelial, immune and stromal cells in intestinal tissue integrity are well understood, the role of intrinsic neuroglia networks remains largely unknown. Here we uncover important roles of enteric glial cells (EGCs) in intestinal homeostasis, immunity and tissue repair. We demonstrate that infection of mice with Heligmosomoides polygyrus leads to enteric gliosis and the upregulation of an interferon gamma (IFNγ) gene signature. IFNγ-dependent gene modules were also induced in EGCs from patients with inflammatory bowel disease. Single-cell transcriptomics analysis of the tunica muscularis showed that glia-specific abrogation of IFNγ signalling leads to tissue-wide activation of pro-inflammatory transcriptional programs. Furthermore, disruption of the IFNγ-EGC signalling axis enhanced the inflammatory and granulomatous response of the tunica muscularis to helminths. Mechanistically, we show that the upregulation of Cxcl10 is an early immediate response of EGCs to IFNγ signalling and provide evidence that this chemokine and the downstream amplification of IFNγ signalling in the tunica muscularis are required for a measured inflammatory response to helminths and resolution of the granulomatous pathology. Our study demonstrates that IFNγ signalling in enteric glia is central to intestinal homeostasis and reveals critical roles of the IFNγ-EGC-CXCL10 axis in immune response and tissue repair after infectious challenge.
Topics: Adventitia; Animals; Chemokine CXCL10; Duodenum; Female; Gliosis; Homeostasis; Humans; Inflammation; Interferon-gamma; Intestines; Male; Mice; Nematospiroides dubius; Neuroglia; Regeneration; Signal Transduction; Strongylida Infections
PubMed: 34671159
DOI: 10.1038/s41586-021-04006-z -
Revista Espanola de Enfermedades... Apr 2023Gastrointestinal tuberculosis (TB) is a rare disease and only involves the duodenum in 2-2,5% of all cases. A 60-year-old female with no reported medical history,...
Gastrointestinal tuberculosis (TB) is a rare disease and only involves the duodenum in 2-2,5% of all cases. A 60-year-old female with no reported medical history, presented with constitutional syndrome with a 10 kg weight loss in three months, epigastric pain, bloating and vomiting. She denied fever or respiratory symptoms. Laboratory examination revealed elevated C-reactive protein levels and low prealbumin. Abdominal computed tomography (CT) showed duodenal wall thickening, mainly in its third part, with infiltration of the root of the mesentery and numerous subcentimeter adenopathies at that level.
Topics: Female; Humans; Middle Aged; Duodenum; Abdomen; Abdominal Pain; Mesentery; Tuberculosis, Gastrointestinal
PubMed: 36695766
DOI: 10.17235/reed.2023.9373/2022 -
World Journal of Gastroenterology Aug 2018() is an organism that is widespread in the human population and is sometimes responsible for some of the most common chronic clinical disorders of the upper... (Review)
Review
() is an organism that is widespread in the human population and is sometimes responsible for some of the most common chronic clinical disorders of the upper gastrointestinal tract in humans, such as chronic-active gastritis, duodenal and gastric ulcer disease, low-grade B-cell mucosa associated lymphoid tissue lymphoma of the stomach, and gastric adenocarcinoma, which is the third leading cause of cancer death worldwide. The routes of infection have not yet been firmly established, and different routes of transmission have been suggested, although the most commonly accepted hypothesis is that infection takes place through the faecal-oral route and that contaminated water and foods might play an important role in transmission of the microorganism to humans. Furthermore, several authors have considered to be a foodborne pathogen because of some of its microbiological and epidemiological characteristics. has been detected in drinking water, seawater, vegetables and foods of animal origin. survives in complex foodstuffs such as milk, vegetables and ready-to-eat foods. This review article presents an overview of the present knowledge on the microbiological aspects in terms of phenotypic characteristics and growth requirements of , focusing on the potential role that foodstuffs and water may play in the transmission of the pathogen to humans and the methods successfully used for the detection of this microorganism in foodstuffs and water.
Topics: Animals; Chronic Disease; Drinking Water; Fast Foods; Feces; Food Microbiology; Foodborne Diseases; Gastrointestinal Diseases; Helicobacter Infections; Helicobacter pylori; Humans; Meat; Seawater; Vegetables
PubMed: 30131654
DOI: 10.3748/wjg.v24.i31.3472