Pylori Bacteria Research Articles

Optical Biosensor Based on Porous Silicon and Tamm Plasmon Polariton for Detection of CagA Antigen of Helicobacter pylori.

Helicobacter pylori (H. pylori) is a common pathogen with a high prevalence of infection in human populations. The diagnosis of H. pylori infection is critical for its treatment, eradication, and prognosis. Biosensors have been demonstrated to be powerful for the rapid onsite detection of pathogens, particularly for point-of-care test (POCT) scenarios. In this work, we propose a novel optical biosensor, based on nanomaterial porous silicon (PSi) and photonic surface state Tamm Plasmon Polariton (TPP), for the detection of cytotoxin-associated antigen A (CagA) of H. pylori bacterium. We fabricated the PSi TPP biosensor, analyzed its optical characteristics, and demonstrated through experiments, with the sensing of the CagA antigen, that the TPP biosensor has a sensitivity of 100 pm/(ng/mL), a limit of detection of 0.05 ng/mL, and specificity in terms of positive-to-negative ratio that is greater than six. From these performance factors, it can be concluded that the TPP biosensor can serve as an effective tool for the diagnosis of H. pylori infection, either in analytical labs or in POCT applications.

Prevalence of Helicobacter pylori resistance to certain antibiotics at An-Najah University Hospital: a cross-sectional study

Antibiotic resistance among bacteria is recognized as the primary factor contributing to the failure of treatment. In this research, our objective was to examine the prevalence of antibiotic resistance in H. pylori bacteria in Palestine. We enlisted 91 individuals suffering from dyspepsia, comprising 49 females and 42 males. These participants underwent esophagogastroduodenoscopy procedures with gastric biopsies. These biopsies were subsequently subjected to microbiological assessments and tested for their susceptibility to various antimicrobial drugs. Among the 91 patients, 38 (41.7%) exhibited the presence of H. pylori. Notably, Ciprofloxacin displayed the highest efficacy against H. pylori, followed by Levofloxacin, Moxifloxacin, and Amoxicillin, with resistance rates of 0%, 0%, 2.6%, and 18.4%, respectively. On the contrary, Metronidazole and Clarithromycin demonstrated the lowest effectiveness, with resistance percentages of 100% and 47.4%, respectively. The outcomes of this investigation emphasize that H. pylori strains within the Palestinian patient group exhibit substantial resistance to conventional first-line antibiotics like clarithromycin and metronidazole. However, alternative agents such as fluoroquinolones and amoxicillin remain efficacious choices. Consequently, we recommend favoring quinolone-based treatment regimens for H. pylori infections and adopting a more judicious approach to antibiotic usage among the Palestinian population.

Application of PCR and ELISA for Investigation the Helicobacter pylori in Stool Specimens of Infected Patients

Background: Infection with Helicobacter pylori is a global health issue, and non-invasive and accurate testing is a promising diagnostic method. Because H. pylori antibodies collapse quite gradually even after effective treatment. So, the tests for identifying the antibody of H. pylori are missing specificity and sensitivity. Instead, the tests of stool antigen for H. pylori are described as an alternative method because they have more reliability and simplicity. Aim: The study was aimed to assess the performance of enzyme-linked immunosorbent assays (ELISA), for the detection of H. pylori antigen in stool and compare it to molecular tests by using two housekeeping genes. Methods: Stool samples were collected from patients (85) who attended the Gastroenterology and Hepatology Teaching Center in Baghdad, Iraq, and underwent esophagogastroduodenoscopy (EGD) for biopsy in a period extended from November 2020 to July 2021. PCR and ELISA were used to Investigate H. pylori in stool specimens of infected patients. Results: The result revealed that 74/85 (87.88%) of specimens were positive by ELISA, whereas 49/85 (57.6%) were positive for the 16 SrRNA gene related to Helicobacter genus and 35/85 (41.1%) were positive for amiA gene related to H. pylori species, and that means the ELISA test is more accurate than PCR analysis for detection of H. pylori bacteria in stool specimen. Conclusion: Detection H. pylori Ag using the ELISA test was superior to the molecular test. Therefore, the ELISA test might replace other methods and could be used for the detection of active H. pylori infection before the inauguration of treatment between dyspeptic patients.

Human Gastric Organoid-Derived Mucus Shares Key Properties with Native Gastric Mucus and Inhibits Motility of Helicobacter pylori

To prevent and treat gastric disease caused by Helicobacter pylori, it is crucial to understand the role of the stomach’s first line of defense: the gastric mucus layer. Gastric mucus is a complex hydrogel that has been studied extensively in animal models, and multiple groups have collected and purified porcine gastric mucus to yield pure solutions of mucin proteins. However, purified mucin—the functional viscoelastic component of mucus—cannot accurately recapitulate the molecular complexity of mucus in its entirety since it lacks salts, lipids, electrolytes, and other proteins. Additionally, access to human samples for functional analyses remains a critical barrier to mucus research. Therefore, the objective of this study was to engineer sterile human gastric mucus in vitro to evaluate its translational potential to native mucus (NM), for further study of interactions between mucus and H. pylori bacteria. In vivo, H. pylori use flagellar motility to traverse the mucus layer and colonize the underlying epithelium. We hypothesize that the microarchitecture and gel-forming capacity of our lab-grown mucus (LGM) significantly restrict H. pylori motility. Inspired by previous studies, we developed and optimized a protocol for the in vitro production of sterile LGM using epithelial monolayers derived from human gastric organoids and cultured at an air-liquid interface. This mucus could be easily harvested and did not require purification or processing. Additionally, mucus production was maintained for over one month, demonstrating the robustness of our culture system. Mass spectrometry and size exclusion chromatography revealed that the LGM has a molecular composition similar to that of native mucus. Further, we have confirmed with cryo-scanning electron microscopy that the LGM has a characteristic honeycomb structure with similar pore size distributions to those found in native mucus. Rheometric frequency sweeps demonstrated comparable, predominantly elastic gel behavior in both LGM and NM samples. Acid flow experiments in a 2D Hele Shaw cell have also demonstrated that LGM enables viscous fingering—a previously studied hydrodynamic phenomenon typical of mucus gels that is thought to be involved in gastric acid transport mechanisms in vivo. Finally, live imaging and particle tracking were used to quantify the motility of H. pylori in the LGM. Compared to liquid media, the LGM caused a significant decrease in H. pylori swimming speed. Overall, our human gastric lab-grown mucus recapitulates key functions of native mucus and will enable future investigations into gastric mucus pathophysiology and H. pylori infection. NIH Grants: R01 GM131408-01 & UL1 TR002319. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

CCR6+ T helper cells and regulatory T cells in the blood and gastric mucosa during Helicobacter pylori infection.

Helicobacter pylori (H. pylori) can evade the host's immune response and persist for a long time on the gastric mucosa. T helper (Th) cells appear to be involved in the control of H. pylori bacteria but promote mucosal inflammation. In contrast, regulatory T cells (Tregs) may reduce inflammation but promote H. pylori persistence. CC motif chemokine receptor 6 (CCR6) is involved in the migration of various cells into inflamed gastric mucosa. In this study, we examined CCR6+ Th cells and CCR6+ Tregs during H. pylori infection in humans. Isolation of cells from blood and mucosal biopsies, magnetic separation of В cells, CD4+ and CD4+CCR6+CD45RO+ T cells, antigen-specific activation, B cell response in vitro, flow cytometry, determination of CD4+CD25hiFoxP3+ Tregs and various groups of Th cells. CD4+CCR6+ blood lymphocytes from healthy donors included Th cells and Tregs. These CCR6+ Th cells produced proinflammatory cytokines and also stimulated plasma cell maturation and antibody production in vitro. H. pylori gastritis and peptic ulcer disease were associated with an increase in the number of circulate CD4+CCR6+CD45RO+ cells and the percentage of Th1, Th17 and Th1/17 cells in this lymphocyte subgroup. In H. pylori-positive patients, circulating CD4+CCR6+ cells contained a higher proportion of H. pylori-specific cells compared with their CD4+CCR6- counterparts. H. pylori infection strongly increased the content of CD4+ lymphocytes in the inflamed gastric mucosa, with the majority of these CD4+ lymphocytes expressing CCR6. CD4+CCR6+ lymphocytes from H. pylori-infected stomach included Tregs and in vivo activated T cells, some of which produced interferon-γ without ex vivo stimulation. H. pylori infection causes an increase in the number of mature CD4+CCR6+ lymphocytes in the blood, with a pro-inflammatory shift in their composition and enrichment of the gastric mucosa with CD4+CCR6+ lymphocytes, including CCR6+ Th1 cells and Tregs.

Functional Polyorganosilsesquioxane Nanocomposite Hydrogels With Encapsulated Silver Nanoparticles – Promising Compounds Against Gastrointestinal Pathogen Bacteria

AbstractNowadays the most common gastrointestinal related gram‐negative H. pylori and E. coli pathogen bacteria that are considered to be the main causes for the development of various gastric diseases and bloodstream infections are rapidly developing resistance against the standard antibiotics, commonly used in the clinical practices. One of the alternative high potential approaches for solving problems of bacterial resistance includes applications of silver‐based materials and silver nanoparticles (AgNPs). In the present study two types of amine‐ and triazol‐ functional polyorganosilsesquioxane nanocomposite sorbent hydrogels with narrowly dispersed AgNPs were developed. In vitro antibacterial activity and cytotoxicity tests showed concentration‐ and time‐dependent activity of the prepared nanocomposites against gram‐negative E. coli and H. pylori bacteria and a reduced cytotoxicity towards Caco‐2 human colon epithelial cells. Molecular structures and chemical compositions of the synthesized composites elucidated with transmission and scanning electron microscopy and UV‐Vis spectroscopy revealed spherical and narrowly dispersed along the polymer matrices AgNPs with average sizes of 3–5 nm. It was estimated that the chemical composition and particularly the zeta‐potentials values that were found to be dependent on the molecular structures of the synthesized nanocomposites had a high influence on the AgNPs antibacterial activity and cytoxicity profiles.

Intragastric bacterial infection and endoscopic findings in Helicobacter pylori-negative patients.

In the present study, the authors examined the association between gastric bacterial infection and gastric endoscopic findings in Helicobacter pylori (H. pylori)-negative patients. The subjects were 105 H. pylori-negative patients. The mean age was 72.8 ± 9.1 years. Endoscopy and gastric juice culture were performed. The presence or absence of endoscopic findings was checked according to the Kyoto classification of gastritis. Culture was positive in 69 patients (65.7%), with Streptococcus α-hemolytic being the most common (51 patients), followed by Neisseria sp. (43 patients). According to the univariate analysis, there was a significant difference between the results of culture and background factors in the use of gastric antisecretory drugs and between the results of culture and various endoscopic findings in atrophic gastritis, intestinal metaplasia, regular arrangement of collecting venule, mucosal swelling, sticky mucus, hyperplastic polyps, hematin, and gastric cobblestone-like lesions. Furthermore, multivariate analysis revealed significant differences in background factors such as the use of gastric antisecretory drugs and endoscopic findings only in patients with mucosal swelling. Endoscopic findings of non-H. pylori bacteria-positive gastritis differed from endoscopic findings of H. pylori-infected gastritis in several respects. In conclusion, our results suggest that non-H. pylori bacteria may infect the stomach and cause gastric inflammation, especially in patients who long term use gastric antisecretory drugs.

Anti-Helicobacter pylori Effects of Thymus caramanicus Jalas Essential Oils: A New Antimicrobial Approach.

Helicobacter pylori are the principal causative factor in the etiological factors of chronic, active, or type B gastritis; peptic and duodenal ulcers; stomach carcinoma; and epithelial tissue lymphoid malignancies. It infects more than half of the population worldwide. To reduce H. pylori production, pharmacological therapy of H. pylori diseases typically involves using threefold treatment methods. However, as a result of such therapy, antimicrobial resistance is commonly developed. Alternative therapeutics for H. pylori diseases are thus of particular interest. Thyme essential oils (EOs) obtained from T. caramanicus Jalas plants in Iran were tested for antibacterial activity against H. pylori obtained from 320 poultry specimens in this investigation. Antibacterial activity was measured using inhibition zones, minimum inhibitory concentrations (MICs), and minimum bactericidal concentrations (MBCs). The impact of T. caramanicus Jalas essential oils on H. pylori isolate cagA, vacA, and babA2 gene expression was evaluated using a quantitative real-time PCR method (p < 0.05). The chemical content of these EOs varied significantly according to chromatographic examination. Thymol, carvacrol, and terpinene-4-ol are the most abundant components in these EOs. H. pylori was recognized as a Helicobacter species with a 175-bp PCR product of 16S rRNA in 20/20 (100%). According to PCR results, all 20 (100%) isolates belonged to H. pylori. The EOs inhibited H. pylori in a dose-dependent manner, with T. caramanicus Jalas being the most effective, followed by pterygium EOs in decreasing order. At 8 mg/mL of T. caramanicus Jalas EOs, IZs against H. pylori were 27.4 ± 0.42 mm, and at 8 mg/mL of pterygium, IZs against H. pylori were 1 ± 0.02. T. caramanicus Jalas essential oils were used to treat all bacteria, and the findings showed that T. caramanicus Jalas had a substantial inhibitory impact on the expression of cagA, vacA, and babA2 virulence-related genes (p < 0.05). In a dose-dependent manner, the EOs of T. caramanicus Jalas EO demonstrated a high degree of antimicrobial property against H. pylori bacteria. The most efficient EOs were those from T. caramanicus Jalas with relative concentrations of thymol and carvacrol, followed by the coumarin-dominated pterygium EO with reduced antibacterial activity.

The significance of chronic hyperglycemia for the reduced efficacy of eradication therapy in patients with type 2 diabetes mellitus and for Helicobacter pylori survival

Aim: This study aims to determine the significance of chronic hyperglycemia for the reduced efficacy of eradication therapy in patients with type 2 diabetes mellitus (T2DM) and Helicobacter pylori (H. pylori)-associated upper gastrointestinal tract pathology as well as for H. pylori survival. Methods: A prospective randomized study with the participation of 180 patients (87 men and 93 women) with H. pylori-associated upper gastrointestinal pathology was carried out. Ninety of these patients were with T2DM and 90 were without diabetes mellitus (DM). The patients were divided into 4 groups of 45 patients: the group 1 included non-diabetic patients treated with the classical triple eradication scheme; the group 2 included patients with T2DM treated with the classical triple eradication scheme; the group 3 included non-diabetic patients treated with bismuth quadro-therapy; the group 4 included patients with T2DM treated with bismuth quadro-therapy. The presence of H. pylori and evaluation of eradication efficacy was carried out using the Helix breath test. Results: The effectiveness of 1st line anti-Helicobacter therapy was higher (88.2%) in patients without diabetes in comparison with the group of patients with concomitant T2DM (74.7%). The efficacy of classical triple eradication therapy in patients with concomitant T2DM was 69.1%, and quadro-therapy was 80.5%. There was significantly lower effectiveness (P &lt; 0.017) of eradication therapy in patients with T2DM and glycated hemoglobin (HbA1c) level ≥ 7.0% as compared with the group of patients in whom the target (≤ 6.5%) level of HbA1c was achieved. Conclusions: Chronic hyperglycemia has a favorable effect on the viability of H. pylori bacteria in patients with T2DM. A hypothesis explaining the reduced efficacy of eradication therapy in patients with hyperglycemia has been proposed.

Terminalia chebula Retz. aqueous extract inhibits the Helicobacter pylori-induced inflammatory response by regulating the inflammasome signaling and ER-stress pathway

Ethnopharmacological relevanceTerminalia chebula Retz., known as the King of Traditional Tibetan Medicine, is widely used for treating various ailments, particularly stomach disorders. It exhibited inhibitory activity against helicobacter pylori.Aim of the study: The exact mechanism by which T. chebula combats H. pylori infection remains unclear. Therefore, this study aimed to investigate its mechanism of action and the key pathways and targets involved. Material and methodsMinimum inhibitory concentration (MIC) assay, scanning electron microscope, and inhibiting kinetics curves were conducted. The mRNA expressions were measured by RNA-seq analysis and RT-QPCR. ELISA and Western blot were used to detect the changes in proteins. The main compounds were analyzed by High-performance Liquid Chromatography. The interaction between the compound and target was predicted by Molecular Docking. ResultsThe study revealed that T. chebula disrupted the structure of H. pylori bacteria and inhibited Cag A protein expression. Additionally, T. chebula can reduce the expression of flaA, flaB, babA, alpA, alpB, ureE, and ureF genes. Furthermore, T. chebula demonstrated its effectiveness in inhibiting the H. pylori-induced inflammatory response by regulating the inflammasome signaling and ER-stress pathway. Moreover, the study discovered that chebulagic acid has anti-HP activity and inhibits the expression of Cag A protein. ConclusionsT. chebula acts as a natural remedy for combating H. pylori infection. Its ability to disrupt the bacterial structure, inhibit key proteins, regulate inflammatory pathways, and the presence of chebulagic acid contribute to its anti-H. pylori activity.

Investigating the Relationship between Type 2 Diabetes and Helicobacter Pylori

Introduction: Helicobacter pylori infection is known as one of the health problems in the world, and the concurrent infection of diabetics with Helicobacter pylori contributes to health and economic problems in the world. The present study was conducted to investigate the prevalence of Helicobacter pylori in patients with type 2 diabetes in Gonabad City, Iran.&#x0D; Methods: This case-control study was conducted in Gonabad City, Iran. The number of participants in the study was 168. The method was simple random sampling and the study population was typing 2 diabetic and non-diabetic people who were referred to Gonabad health centers. After obtaining informed consent from the patients, 4 milliliters of venous blood were collected from the patients with type 2 diabetes and the control group, and IgG antibodies against Helicobacter pylori and Fasting Blood Sugar and Glycosylated Hemoglobin (HbA1C) were measured by ELISA and Colorimetric method, respectively. After entering the data into SPSS version 16 software, they were analyzed using independent tests, chi-square tests, and logistic regression tests.&#x0D; Results: In the present study, 71.4% of type 2 diabetes patients had IgG antibodies against H. pylori bacteria. The odds ratio of diabetes in the patients with positive IgG was 1.37 times that of patients with negative IgG, and this relationship was statistically significant (P=0.003).&#x0D; Conclusion: The present study showed that H. pylori was more common in diabetic patients than non-diabetic ones, and in diabetic patients, there was no statistically significant relationship between the duration of diabetes, family history of diabetes, and smoking history with Helicobacter pylori infection.

Insights into the Pathogenesis, Virulence Factors, and Diagnosis of Helicobacter pylori: A Comprehensive Review

The H. pylori bacterium, which resides in the human stomach and is linked to a number of gastrointestinal illnesses, is introduced in-depth in this article. We examine how H. pylori establishes infection, thwarts the hosting immune response, and causes inflammation as we explore the pathophysiology of this bacterium. We also talked about how H. pylori influences host cells and develops a favorable environment for survival. We also go over the many methods for identifying H. pylori, such as endoscopy, biopsy, blood, breath, feces, and others. We stress the importance of an accurate and speedy diagnosis while outlining the advantages and disadvantages of each diagnostic strategy to manage disorders caused by H. pylori effectively. Throughout this review, we aim to unravel the mysteries surrounding H. pylori, providing valuable insights into its pathogenesis, the intricate interplay of virulence factors, and the diverse diagnostic strategies employed in clinical practice. Enhancing our understanding of H. pylori can pave the way for improved therapies and patient outcomes.

Serum Anti-Helicobacter pylori IGG Antibody Test Among Patients with Diabetes: A Cross-Sectional Study

Diabetes patients frequently experience numerous and serious chronic infections because of their weakened cellular and humoral immune systems. Regrettably, there is insufficient information on the prevalence of Helicobacter pylori (H. pylori) infection among diabetics, especially in southern Libya. This study aimed to determine how frequently these bacteria were infected among diabetes patients in various parts of Ubari. This study was conducted on 150 diabetic patients of both sexes, who visited the health centers in different Ubari areas. Their ages ranged from 20 to 80. Analysis of blood serum samples to measure Helicobacter pylori IgG antibodies by the enzymatic immunoassay (ELISA) and the rapid test (cassette rapid test). Biochemistry parameters such as Blood glucose concentration, cumulative glucose, ?-amylase, LDH, Serum cholesterol, Triglycerides, LDL, and HDL, as well as the blood group, were also measured. Other data collected was the body mass index. A questionnaire was used to find out some habits, such as smoking, the use of spices in food, and the type and duration of diabetes. Data showed the rate of infection with H. pylori bacteria through immunological testing was 45.33% in both sexes; however, it was significantly higher in males than females, 28% and 17%, respectively. The infection rate was found to be higher in the age group 41–60 years, and there was no significant difference in bacterial infection between patients with type I and type II diabetes (20.7 and 24.7%), respectively. Similarly, there was no effect of body mass index on the rate of infection.

Aiding gastrointestinal diagnostic laboratory by designing a device for the non invasive detection of peptic ulcer.

Peptic ulcer (PU) has been recognized as an utmost gastrointestinal problem that affects the lining of the stomach and duodenum, specifically triggering soreness. It is a life-threatening condition, while roots of the infection are not identified yet. There are various risk factors for the cause of peptic ulcer disease, but the most significant is "Helicobacter pylori" (H. pylori). The detection of this disease involves different invasive procedures which are painful and not feasible for everyone. The aim of this device is to identify the peptic ulcer non-invasively by unmasking the presence of H. Pylori bacterium by monitoring crucial parameters of the disease which include respiration rate, heart rate, ECG, pH of Saliva, and temperature. Multiple investigations related to PU authenticate the alteration in these physicochemical aspects of the body. The increase in the level of stomach acid in PU is responsible for belching and bloating. Heart rate, temperature, and respiratory rate are also elevated during peptic ulcers while the pH of Saliva is decreased toward the acidic side. The disturbance in the QRS complex of the ECG wave is also observed. These biosignals are examined as analog input from the body, sent into MCP3008, and converted into digital input signals. Then these digital inputs are directed toward Raspberry pi 3 which processes, received inputs, and shows output on the LCD. The values of parameters obtained are then compared with standard values and a conclusion is made that whether a patient has a peptic ulcer or not.

Clinical and diagnostic features of chronic gastroduodenitis in children depending on the constitution type

Aims. The study of clinical and diagnostic features of the course of chronic gastroduodenitis in children, taking into account the types of constitution (somatotypes), the impact of these features on the course of the disease and the treatment.Materials and methods. We studied 250 patients with a diagnosis of “Chronic gastroduodenitis” aged 4 to 17 years, with morphological changes in the mucous membrane of the stomach and duodenum, corresponding to the criteria for gastroduodenitis, as well as contamination with the H. pylori bacterium. An assessment was made of the age, gender composition, types of constitution according to the classifi cation of M. V. Chernorutsky (based on the Pignet index). Clinical- anamnestic and laboratory- instrumental features of the course of chronic gastroduodenitis in one or another somatotype were noted. The analysis and assessment of the infl uence of the constitutional specifi city of the patient on the course of the disease and the results of treatment was carried out.Results and conclusion. It was revealed that the presence of an asthenic type of constitution predisposes to the frequent development of chronic gastroduodenitis in children, but a milder course with the development of superfi cial gastroduodenitis, in contrast to normosthenic and hypersthenic types, prone to the development of hypertrophic and erosive gastroduodenitis. It was noted that in asthenics and normosthenics, the success of eradication anti- Helicobacter therapy is signifi cantly higher than in hypersthenics.

The Role of Helicobacter pylori in Induction of Gastric Autoimmunity

Introduction: Helicobacter pylori (H. pylori) is a member of the causative factors of digestive system complaints, such as gastritis, stomach ulcers, mucosal-associated lymphoid tissue lymphoma (MALT), and gastric cancer (GC). This research aimed to determine the H. pylori bacteria's possible roles in autoimmune gastritis (AIG) and assess the sera concentrations of vitamin B12 (VB12) and iron in individuals with and without H. pylori disease. Methods: In the Province of Thi-Qar, Iraq, case-control research was conducted during the time of November-2021 to June-2022, which included 55 subjects having H. pylori-associated diseases and 35 healthy individuals. The eligibility criteria of both study groups were followed stringently. For the patient's group, subjects underwent an endoscopic examination and a stool antigen test (SAT). Additionally, the subjects of all research cohorts were assessed for their sera levels of anti-H. Pylori-antibodies (Abs), parietal cells auto-Abs (PCA), VB12, and iron. Results: The findings revealed a significantly higher level of PCA positivity and lower levels of VB12 and iron by comparing the patient group with the control group. In both study groups, serum level of anti-H. pylori immunoglobulin gamma (IgG) Abs positively associated with PCA and inversely correlated with serum VB12 and iron in the patient's group. Conclusions: There were correlations between H. pylori infection and PCA-positive status, lower VB12, and low iron levels. Anti-H. pylori-IgG serum concentration was a valuable biomarker for the risk of developing AIG, low VB12, and iron levels. Parietal cells auto-Abs were not associated with VB12 and iron levels.

Helicobacter pylori Modulates Heptose Metabolite Biosynthesis and Heptose-Dependent Innate Immune Host Cell Activation by Multiple Mechanisms.

Heptose metabolites including ADP-d-glycero-β-d-manno-heptose (ADP-heptose) are involved in bacterial lipopolysaccharide and cell envelope biosynthesis. Recently, heptoses were also identified to have potent proinflammatory activity on human cells as novel microbe-associated molecular patterns. The gastric pathogenic bacterium Helicobacter pylori produces heptose metabolites, which it transports into human cells through its Cag type 4 secretion system. Using H. pylori as a model, we have addressed the question of how proinflammatory ADP-heptose biosynthesis can be regulated by bacteria. We have characterized the interstrain variability and regulation of heptose biosynthesis genes and the modulation of heptose metabolite production by H. pylori, which impact cell-autonomous proinflammatory human cell activation. HldE, a central enzyme of heptose metabolite biosynthesis, showed strong sequence variability between strains and was also variably expressed between strains. Amounts of gene transcripts in the hldE gene cluster displayed intrastrain and interstrain differences, were modulated by host cell contact and the presence of the cag pathogenicity island, and were affected by carbon starvation regulator A (CsrA). We reconstituted four steps of the H. pylori lipopolysaccharide (LPS) heptose biosynthetic pathway in vitro using recombinant purified GmhA, HldE, and GmhB proteins. On the basis of one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry, the structures of major reaction products were identified as β-d-ADP-heptose and β-heptose-1-monophosphate. A proinflammatory heptose-monophosphate variant was also identified for the first time as a novel cell-active product in H. pylori bacteria. Separate purified HldE subdomains and variant HldE allowed us to uncover additional strain variation in generating heptose metabolites. IMPORTANCE Bacterial heptose metabolites, intermediates of lipopolysaccharide (LPS) biosynthesis, are novel microbe-associated molecular patterns (MAMPs) that activate proinflammatory signaling. In the gastric pathogen Helicobacter pylori, heptoses are transferred into host cells by the Cag type IV secretion system, which is also involved in carcinogenesis. Little is known about how H. pylori, which is highly strain variable, regulates heptose biosynthesis and downstream host cell activation. We report here that the regulation of proinflammatory heptose production by H. pylori is strain specific. Heptose gene cluster activity is modulated by the presence of an active cag pathogenicity island (cagPAI), contact with human cells, and the carbon starvation regulator A. Reconstitution with purified biosynthesis enzymes and purified bacterial lysates allowed us to biochemically characterize heptose pathway products, identifying a heptose-monophosphate variant as a novel proinflammatory metabolite. These findings emphasize that the bacteria use heptose biosynthesis to fine-tune inflammation and also highlight opportunities to mine the heptose biosynthesis pathway as a potential therapeutic target against infection, inflammation, and cancer.

The Study of Helicobacter Pylori Bacteria Infection in Bani Waleed city -Libya

The current study included 430 infected cases with H. pylori bacteria in Bani Waleed city, Libya. Risk factors that might have an important role in an increasing the risk of infection were studied such as drinking stimulants tea and coffee, and smoking. The samples were blood and faces and were tested using rapid test to find the infection. The percentage of infected people who drank both or one of the stimulants was 74%. Most of infected cases were young people between the ages of 25 to 36 years, with an infection rate of 35%. The study also showed that eating spices increased the risk of infection to 64%, however infection rate among men was higher than women at a rate of 55%, while the infection rate among women was 45%. On the other hand, study showed that the smoking was not significant, as 56% for smokers were infected, Also, the study indicated that there is no link between H. pylori infection and chronic diseases such as diabetes and blood pressure, as the results showed that 76% of the infected people do not suffer from any chronic diseases. It was also found that the two blood groups A and O are more prevalent among those infected with H. pylori bacteria, with a percentage of 31% for both types, followed by blood group B, with 26%, then blood group AB at 12%. More studies should be carried out to establish the risk factors and set a control plan.

Gastric microbiota dysbiosis and Helicobacter pylori infection.

Helicobacter pylori (H. pylori) infection is one of the most common causes of gastric disease. The persistent increase in antibiotic resistance worldwide has made H. pylori eradication challenging for clinicians. The stomach is unsterile and characterized by a unique niche. Communication among microorganisms in the stomach results in diverse microbial fitness, population dynamics, and functional capacities, which may be positive, negative, or neutral. Here, we review gastric microecology, its imbalance, and gastric diseases. Moreover, we summarize the relationship between H. pylori and gastric microecology, including non-H. pylori bacteria, fungi, and viruses and the possibility of facilitating H. pylori eradication by gastric microecology modulation, including probiotics, prebiotics, postbiotics, synbiotics, and microbiota transplantation.

A novel loop-mediated isothermal amplification-lateral flow dipstick method for Helicobacter pylori detection.

To eradicate Helicobacter pylori (H. pylori) and reduce the risk of gastric cancer, a sensitive, specific, convenient, and simple detection method is needed. This study aimed to establish a novel loop-mediated isothermal amplification-lateral flow dipstick (LAMP-LFD) method for H. pylori detection. LAMP primer design software was used to design primers for the conserved sites of the H. pylori ureB gene. UreB-FIP-labeled biotin was used for LAMP amplification, and FAM-labeled probes were specifically hybridized with LAMP amplification products, which were then detected by LFD. In addition, a clinical study was conducted to assess LAMP-LFD in 20 fecal samples. The results of the optimization indicated that H. pylori could be specifically detected by LFD without cross-reaction with other non-H. pylori bacteria when the LAMP was performed at 65°C for 60 min. The lower limit of the detection method was 102 copies/μL, which was 100 times the sensitivity of polymerase chain reaction (PCR). H. pylori-positive fecal samples were detected by LAMP-LFD in 13/20 patients. In conclusion, a new LAMP-LFD assay has been fully established and confirmed for H. pylori detection. The entire process can be completed in approximately 1.5 h, with the advantages of strong specificity, high sensitivity, and simple operation. This study provides a novel potential method for the detection of H. pylori in the clinical settings of primary hospitals and low-resource countries.