Gastric Biopsies Research Articles

Associations between biofilm formation and virulence factors among clinical Helicobacter pylori isolates

IntroductionHelicobacter pylori (H. pylori) causes several gastrointestinal diseases. Its virulence factors contributing to disease development include biofilm formation, cytotoxin-associated gene A (CagA) and vacuolating cytotoxin A (VacA) proteins that induce host tissue damage. In addition, urease activity enables H. pylori growth in the gastric acidic environment. This work aimed to characterize bacterial factors associated with biofilm production among 89 clinical H. pylori isolates, collected from patient gastric biopsies. MethodsBiofilm production was detected using the crystal violet method. PCR was performed to determine vacA genotype (s1m1, s1m2, s2m1 and s2m2) and cagA gene presence. Urease activity was measured via the phenol red method. Susceptibility to six antibiotics was assessed by the Etest method. ResultsMost H. pylori isolates produced biofilm. No association was found between biofilm-formation capacity and cagA presence or vacA genotype. Urease activity levels varied across isolates; no association was found between biofilm-formation and urease activity. Clarithromycin resistance was measured in 49 % of the isolates. Isolates susceptible to tetracycline were more commonly strong biofilm producers. In contrast, a significantly higher rate of strong biofilm producers was observed among resistant isolates to amoxicillin, levofloxacin and rifampicin, compared to susceptible isolates. Non-biofilm producers were more common among isolates sensitive to rifampicin and metronidazole, compared to resistant isolates. ConclusionsFurther studies are needed to understand the factors that regulate biofilm production in order to search for treatments for H. pylori biofilm destruction.

Intratumoral and fecal microbiota reveals microbial markers associated with gastric carcinogenesis.

The relationship between dysbiosis of the gastrointestinal microbiota and gastric cancer (GC) has been extensively studied. However, microbiota alterations in GC patients vary widely across studies, and reproducible diagnostic biomarkers for early GC are still lacking in multiple populations. Thus, this study aimed to characterize the gastrointestinal microbial communities involved in gastric carcinogenesis through a meta-analysis of multiple published and open datasets. We analyzed 16S rRNA sequencing data from 1,642 gastric biopsy samples and 394 stool samples across 11 independent studies. VSEARCH, QIIME and R packages such as vegan, phyloseq, cooccur, and random forest were used for data processing and analysis. PICRUSt software was employed to predict functions. The α-diversity results indicated significant differences in the intratumoral microbiota of cancer patients compared to non-cancer patients, while no significant differences were observed in the fecal microbiota. Network analysis showed that the positive correlation with GC-enriched bacteria increased, and the positive correlation with GC-depleted bacteria decreased compared to healthy individuals. Functional analyses indicated that pathways related to carbohydrate metabolism were significantly enriched in GC, while biosynthesis of unsaturated fatty acids was diminished. Additionally, we investigated non-Helicobacter pylori (HP) commensals, which are crucial in both HP-negative and HP-positive GC. Random forest models, constructed using specific taxa associated with GC identified from the LEfSe analysis, revealed that the combination of Lactobacillus and Streptococcus included alone could effectively discriminate between GC patients and healthy individuals in fecal samples (area under the curve (AUC) = 0.7949). This finding was also validated in an independent cohort (AUC = 0.7712). This study examined the intratumoral and fecal microbiota of GC patients from a dual microecological perspective and identified Lactobacillus, Streptococcus, Roseburia, Faecalibacterium and Phascolarctobacterium as intratumoral and intestinal-specific co-differential bacteria. Furthermore, it confirmed the validity of the combination of Lactobacillus and Streptococcus as GC-specific microbial markers across multiple populations, which may aid in the early non-invasive diagnosis of GC.

Prevalence and resistance of Helicobacter pylori in a predominantly Hispanic population.

Helicobacter pylori (H. pylori) is the most common chronic bacterial infection in humans. The risk of acquiring H. pylori is related to socioeconomic status and living conditions early in life. Treatment regimens must consider local antibiotic resistance patterns. Adventist Health White Memorial Hospital serves a predominantly indigent population in east Los Angeles with a large number of immigrants from South and Central America. Data regarding the prevalence and resistance of H. pylori in this population is scant. To evaluate the prevalence and resistance of H. pylori and correlate with country of origin. All gastric biopsies were obtained by a single gastroenterologist at the hospital in a consecutive manner from patients with gastritis from 2017 to 2022 and sent to various labs for evaluation. Two hundred and sixty-six patients are born in the United States, 450, 171, 70, and 30 patients are immigrants from Mexico, Central and South America (CSA), Asia, and other countries respectively. Overall, 14.65% were found to be infected with H. pylori. Rates of infection in United States-born citizens, immigrants from Mexico, CSA, and Asia are 9.02%, 18.67%, 13.45%, and 11.43% respectively, with Mexican immigrants having a relative risk of 2.3889 [95% confidence interval (CI): 1.4789-3.8588, P = 0.0004] compared to those born in United States. No correlation seen between infection and length of time immigrants were in United States. Relative risk of infection in patients with no proton pump inhibitor use within the past 30 days found to be 1.9276 (95%CI: 1.3562-2.7398, P = 0.0003). Rates of resistance for clarithromycin and levofloxacin are 21.43% and 31.11%. H. pylori infection appears to be associated with low socioeconomic status and poor living conditions early in life. Clarithromycin and levofloxacin based treatment regimens should be avoided as first line therapy in this region, particularly in patients of Latin American origin.

Concurrent Esophageal Leiomyoma and Helicobacter pylori Infection

Esophageal leiomyomas are rare benign tumors arising from smooth muscle cells in the esophagus. Despite their rarity, they present unique diagnostic and management challenges due to varied symptomatology and anatomical locations. Here, we present a case of a 40-year-old male with unresolved dysphagia and epigastric pain referred for esophagogastroduodenoscopy (EGD). EGD revealed a medium-sized submucosal mass at the gastroesophageal junction, partially obstructing the lumen. Concurrently, severe chronic active gastritis with Helicobacter pylori (H. pylori) infection was confirmed upon gastric biopsy. Subsequent evaluation included endoscopic ultrasound (EUS), which identified a likely benign esophageal leiomyoma. Although a surgical referral was recommended, the patient was deferred. This case highlights the importance of EGD in diagnosing esophageal leiomyomas and uncovering incidental findings that can significantly influence patient management. The rare presentation of this leiomyoma at the gastroesophageal junction, combined with the co-occurrence of severe H. pylori-induced gastritis and chronic GERD, introduces new considerations for understanding the pathophysiology of esophageal tumors. The rare combination of these factors highlights the need for further research into their interactions, providing novel insights that could influence future diagnostic strategies and therapeutic approaches for similar cases.

Chronic Atrophic Gastritis and Intestinal Metaplasia: A Latin American Perspective

Gastric cancer (GC), a significant cause of mortality globally, is the leading cause of cancer-related deaths among Latin American men. GC is usually diagnosed at an advanced stage; therefore, therapeutic options are limited, and prognosis is poor. <i>Helicobacter pylori</i> infection remains the primary risk factor for GC; therefore, primary prevention directed toward diagnosis and treatment (“test-and-treat” strategy) is important. Western medicine guidelines recommend esophagogastroduodenoscopy (EGD) for at-risk individuals aged >40 years with regular surveillance in patients with gastric premalignant conditions (GPMC). However, limited availability of EGD in Latin America necessitates development of risk stratification tools to minimize the endoscopic burden. Results from the Chilean “Endoscopic Cohort and Histological Operative Link on Gastric Assessment (OLGA) Staging” (ECHOS study), propose endoscopic surveillance of advanced GPMC (OLGA/Operative Link for Gastric Intestinal Metaplasia [OLGIM] stages III–IV) with reliable risk stratification to facilitate early GC detection. Ensuring high-quality EGD and enhanced diagnostic yield of GPMC is essential. GPMC grading tools, such as the Kimura-Takemoto or Endoscopic Grading of Gastric Intestinal Metaplasia classification, should be incorporated into the regular risk assessment protocol. However, obtaining mapping gastric biopsies using standardized methods such as the updated Sydney System biopsy protocol, followed by grading of chronic atrophic gastritis with or without intestinal metaplasia using the OLGA and OLGIM staging systems are preferred for GC risk stratification. Recent GC prevention strategies recommended in Chile include a “test-and-treat” approach for <i>H. pylori</i> in individuals aged 35–44 years and combined <i>H. pylori</i>/pepsinogen I–II serology and EGD evaluation in patients aged >45 years to optimize the limited preventive resources available in the region.

The prevalence of mutations underlying development of Helicobacter pylori resistance to antibiotics in Kazan

One of the reasons for the decrease of Helicobacter pylori eradication effectiveness is its resistance to antibiotics. To examine the prevalence of H. pylori point mutations responsible for clarithromycin and levofloxacin resistance among the patients with upper gastrointestinal (GI) tract disorders in Kazan. The study included 203 patients with symptoms of dyspepsia who underwent upper GI endoscopy at the University Hospital of Kazan Federal University (Kazan, Russia) in 2019-2021. DNA isolation from gastric antrum mucosal biopsies was performed using PureLink Genomic DNA Mini Kits (Thermo Fisher Scientific, USA). Polymerase chain reaction was performed using primers specific for the V-region of the 23S gene and the A subunit DNA gyrase encoding gyrA gene region. The sequencing of obtained DNA fragments was performed on 3730 DNA Analyzer. The sequences were searched for point mutations responsible for H. pylori resistance to clarithromycin (A2143G, A2142G and A2142C193 mutations) and levofloxacin (mutations of the gyrA gene). H. pylori was detected in 47.78% of biopsy specimens using polymerase chain reaction. The proportion of H. pylori strains with mutations leading to clarithromycin resistance was 17.53%. Amino acid substitutions in the gyrA gene were found in 12.37% of samples. In case of two H. pylori strains (2.06%), dual resistance to clarithromycin and levofloxacin was found. So high incidence of mutations underlying the development of H. pylori resistance to clarithromycin and levofloxacin was observed among examined patients in Kazan.

ELP1, the Gene Mutated in Familial Dysautonomia, Is Required for Normal Enteric Nervous System Development and Maintenance and for Gut Epithelium Homeostasis.

Familial dysautonomia (FD) is a rare sensory and autonomic neuropathy that results from a mutation in the ELP1 gene. Virtually all patients report gastrointestinal (GI) dysfunction and we have recently shown that FD patients have a dysbiotic gut microbiome and altered metabolome. These findings were recapitulated in an FD mouse model and moreover, the FD mice had reduced intestinal motility, as did patients. To understand the cellular basis for impaired GI function in FD, the enteric nervous system (ENS; both female and male mice) from FD mouse models was analyzed during embryonic development and adulthood. We show here that not only is Elp1 required for the normal formation of the ENS, but it is also required in adulthood for the regulation of both neuronal and non-neuronal cells and for target innervation in both the mucosa and in intestinal smooth muscle. In particular, CGRP innervation was significantly reduced as was the number of dopaminergic neurons. Examination of an FD patient's gastric biopsy also revealed reduced and disoriented axons in the mucosa. Finally, using an FD mouse model in which Elp1 was deleted exclusively from neurons, we found significant changes to the colon epithelium including reduced E-cadherin expression, perturbed mucus layer organization, and infiltration of bacteria into the mucosa. The fact that deletion of Elp1 exclusively in neurons is sufficient to alter the intestinal epithelium and perturb the intestinal epithelial barrier highlights a critical role for neurons in regulating GI epithelium homeostasis.

Successful novel use of dupilumab for gastrointestinal involvement of idiopathic hypereosinophilic syndrome: case report and review of the literature.

Hypereosinophilic syndrome (HES) is characterized by blood and tissue hypereosinophilia leading to organ damage. Gastrointestinal involvement is the third most common manifestation. We present a patient with idiopathic HES with secondary eosinophilic esophagitis (EoE), gastritis, and enteritis, corticosteroids-dependent, azathioprine- and mepolizumab-refractory. The patient achieved clinical and histopathologic remission following dupilumab treatment. A 28year-old female presented with chronic episodic nausea and emesis since childhood and initial diagnosis of primary eosinophilic gastrointestinal disease (EGID), improved with corticosteroids, refractory to azathioprine. She was found to have peripheral eosinophilia and multifactorial anemia, with iron, B12, and folate deficiencies. Esophageal, gastric, duodenal, and terminal ileum biopsies showed significant eosinophilic infiltrate. Bone marrow biopsy at age 31 confirmed HES diagnosis. By age 32, she became total parental nutrition (TPN)-dependent. She failed trials of benralizumab and mepolizumab [anti-interleukin (IL)-5 inhibitors], and cromolyn (mast-cell stabilizer). After developing new esophageal stricture, we initiated dupilumab (IL-4/13 inhibitor), recently FDA-approved for EoE. After 9weeks, esophageal stricture, gut tissue eosinophilia, and prior intestinal ulcerations resolved. She ceased TPN and is tolerating a non-restricted diet, with complete symptom resolution. Our patient's complete remission with dupilumab shows promise for broadening its use in treating GI involvement in HES, along with primary EGIDs.

Genotypes and Phylogenetic Analysis of Helicobacter pylori Clinical Bacterial Isolates

Helicobacter pylori is a human pathogen bacterium associated with gastritis, peptic ulcer, and gastric cancer. It can be identified through the 16S rRNA gene and characterized through cagA and vacA virulence genes. Clinical cultures of H. pylori were isolated and identified from human stomach biopsies. The isolates were characterized according to their colonial and microscopic morphology, and molecular genotyping was conducted to determine the bacterial virulence. A phylogenetic analysis of the 16S rRNA gene sequencing was performed. In addition, multilocus sequence typing analysis was performed to determine the phylogeographic nature of the isolated strains. Three bacterial isolates were selected from 22 gastric biopsies, identified as H. pylori through colonial morphology, Gram staining, urease, catalase, and oxidase tests and identification of the ureC gene through end-point PCR. Amplification of 16S rRNA, urea, and tonB genes was performed, as well. Differences between the cagA and vacA genotypes were determined among the isolates. The phylogenetic analysis confirmed the identity of the three isolates as the specie Helicobacter pylori. Different genotypes were obtained for each H. pylori strain, and all the clinical isolates showed the vacA s2/m2 genotype, indicating an absence of the VacA cytotoxin. Only HCGDL-MR01 is a cagA gene carrier with a greater risk to develop a serious disease, such as stomach cancer and peptic ulcer. The multilocus sequence typing placed all the strains within the hpEurope population structure.

Microplastic in Gastric Fasting Liquid and Associated Gastric Pathology.

To determine the presence of microplastics in the stomach, and the relationship between pathological changes in stomach tissue and microplastics. An analytical study. Place and Duration of the Study: Department of Internal Medicine, Sorgun State Hospital, Yozgat, Turkiye, from December 2022 to November 2023. Fasting gastric fluid sampling and endoscopic sampling including mucosal and submucosal layers from the antrum were performed. The pH values of the gastric fluids were recorded. Samples were analysed gradually by adding iron solution, hydrogen peroxide, and sodium chloride (NaCl) in a beaker at 75 degrees for 30 minutes. Biopsy materials obtained from antrum were examined histopathologically and reported according to the Sydney classification. The relationship between gastric biopsy results and the presence of microplastic was evaluated using Chi-square test. The significance level was taken as p <0.005. The study included 61 individuals. The presence of microplastics was detected in 17 (27.86%) gastric fluid samples obtained from the individuals. A significant correlation was found between increased activity and inflammation in antrum biopsy and the presence of microplastic (χ2 = 8.55 p = 0.014; χ2 = 25.75, p = 0.001). The relationship between atrophy, metaplasia, and Helicobacter pylori in gastric tissue and the presence of microplastic was statistically insignificant (p >0.05). Microplastics were detected in gastric fasting fluid. These materials can cause histopathologic changes and inflammation in the gastric antrum. H. pylori, Intestinal metaplasia, Inflammation, Microplastic, Plastic, Sydney classification.

Characterization of Metronidazole, Clarithromycin and Amoxicillin Resistance Genes in Helicobacter pylori Isolated from Gastroenteritis Patients.

Helicobacter pylori (H. pylori)is a Gram-negative, microaerophilic, and spiral shape bacterium that resides inside the human stomach. The human stomach serves as its primary reservoir. Complaints about stomach complication due to H. pylori infections are reported in the majority of populations around the globe. Chronic gastritis and intestinal metaplasia of the gastric mucosa are major complications of a long-term H. pylori infections that can lead to gastric cancer in severe cases. This study aims to characterize H. pylori isolates from gastroenteritis patients and to determine the resistance of H. pylori to various antibiotics. In the current study, a total of (n = 80) gastric biopsy samples were randomly collected from gastroenteritis patients in brain-heart infusion broth. These were inoculated on Columbia blood agar supplemented with Helicobacter pylori selective supplement (DENT). After culturing, Microscopy and biochemical tests were performed. The susceptibility profile of H. pylori isolates was evaluated using the Kirby Bauer disk diffusion method. On the basis of the drug resistance profile, a total of (n = 20) isolates including (n = 10) from females and (n = 10) from males were selected for the detection and characterization of resistant genes. After confirmation of H. pylori using 16s rRNA, polymerase chain reaction (PCR) was done for the detection of resistance genes including Metronidazole resistance (rdxA gene), Clarithromycin resistance (23s rRNA gene) and Amoxicillin resistance (Penicillin-binding protein A1 (pbpA1) gene). In a total of (n = 80) samples, H. pylori was isolated from 72.5% (n = 58) samples. Among the positive patients, there were 62% (n = 36) of female positive patients while in males, its ratio was 38% (n = 22). It was more common in the age between 30-50 years 55.17% (n = 32). It has shown the highest resistance towards Metronidazole 90% (n = 52), and the lowest toward Levofloxacin 65% (n = 38). Metronidazole resistance gene (rdxA gene) was detected in (n = 13) isolates including (n = 9) isolates from females and (n = 4) from males. In the case of, the Clarithromycin resistance gene (23s rRNA) (n = 10) was positive for H. pylori including (n = 6) isolates from females and (n = 7) were positive for Amoxicillin (pbpA1 gene) including (n = 2) in female and (n = 5) from male patients. This study highlights the increasing incidence of H. pylori infections in both male and female patients. It also revealed the current status of antibiotic resistance and its resistance genes in patients facing gastrointestinal issues. Continuous surveillance of resistant clones will help in formulating strategies that can help in combating of resistant clone. It will also help clinician in proper prescription and management of H. pylori infections.

Biological variability of human intraepithelial lymphocytes throughout the human gastrointestinal tract in health and coeliac disease.

Intraepithelial lymphocytes are the first line of defence of the human intestinal immune system. Besides, their composition is altered on patients with coeliac disease (CD), so they are considered as biomarkers with utility on their diagnose and/or monitoring. Our aim is to address their variability through the human gastrointestinal tract in health and characterized them in further depth in the coeliac duodenum. Intraepithelial lymphocytes were isolated from human gastric, duodenal, ileal and colonic biopsies, then stained with specific antibodies and acquired by flow cytometry. Our results confirmed that the profile of Intraepithelial lymphocytes change through the length of the human gastrointestinal tract. Besides and given the central role that Interleukin-15 (IL-15) elicits on CD pathogenesis; we also assessed the expression of its receptor revealing that there was virtually no functional IL-15 receptor on duodenal Intraepithelial lymphocytes. Nevertheless and contrary to our expectations, the active IL-15 receptor was not increased either on Intraepithelial lymphocytes from CD patients. IL-15 might require additional stimulus to activate intraepithelial lymphocytes. These findings may provide novel tools to aid on a CD diagnosis and/or monitoring, at the time that provide the bases to perform functional studies in order of getting a deeper insight in the specific function that Intraepithelial lymphocytes elicit on CD pathogenesis.

Strongyloides Hyperinfection Syndrome and Severe Malnutrition in an Immunocompetent Patient

Aims: Strongyloides Hyperinfection Syndrome (SHS) and disseminated Strongyloidiasis have been extensively reported in immunocompromised patients. In SHS, large parasitic loads of larvae cause symptoms mainly limited to the gastrointestinal tract and lung, whereas in the disseminated form multiple organs can be affected with high mortality if inappropriately treated. Case Presentation: Here we present an unusual case of a 28-year-old (HIV negative) patient with confirmed untreated Helicobacter pylori, symptoms of gastric and pulmonary hyperinfection complicated with severe weight loss, respiratory symptoms with hemoptysis and refeeding syndrome. Discussion: The diagnosis was based on histological confirmation of the parasite in the gastric mucosal biopsy and stool analysis. The patient was successfully treated with ivermectin and discharged in reasonable medical conditions. Conclusion: This case illustrates the importance of considering Strongyloides Hyperinfection in immunocompetent patients presenting with chronic vomiting, weight loss and anemia, especially in developmental countries.

γH2AX as an Indicator for DNA Double-Strand Breaks in Helicobacter pylori-Associated Chronic Gastritis among Jordanian Patients: A Retrospective Study

Background and Aims: Serine 139 phosphorylation of H2AX (γH2AX) is a biomarker for an early response to DNA double-strand breaks (DSB) and to monitor DNA damage and resolution. This study aimed to measure the rate of γH2AX expression associated with H. pylori infection in Jordanian patients with chronic gastritis. Materials and Methods: A retrospective case-control study was designed to evaluate the rate of γH2AX expression in the epithelium of gastric tissue in subjects chronically infected with H. pylori. A total of 75 gastric biopsy samples embedded in paraffin were chosen from the library, including 50 samples with chronic H. pylori infection and 25 negative samples for H. pylori and any other gastric pathologies. PCR and immunohistochemistry were used to confirm the diagnosis of H. pylori-infected and noninfected gastric biopsies, and the rate of γH2AX formation was analyzed in the mucosa using immunohistochemical staining analyses. Results: PCR and immunohistochemistry proved H. pylori infection in the gastric biopsies of diseased patients (n = 50) and the absence of H. pylori infection in negative samples (n = 25). A strong nuclear signal of γH2AX was detected in the positive samples using immunohistochemistry compared to the undetected signal in the noninfected samples of the gastric mucosa. Conclusion: Our findings show that H. pylori infection is accompanied with high levels of DSBs. This may play a role in the increased risk for tumor initiation associated with H. pylori carriage.

Trend of Helicobacter pylori Infection in Childhood: A Single-Center Experience.

Helicobacter pylori (HP) is the most common bacterial infection in humans. Helicobacter pylori infection, which frequently increases with age, is seen in 30%-56.6% of children in Turkey, although it varies by region. In this study, we aimed to determine the frequency of HP in children and adolescents who underwent upper gastrointestinal endoscopy and gastric biopsy in our region and to compare the changes over the years. Cases who underwent upper gastrointestinal endoscopy for various indications between 2007 and 2022 in our pediatric gastroenterology unit were included in the study. The clinical and endoscopic characteristics of 1737 cases whose histopathologic specimens were obtained, have been retrospectively analyzed from their records. The diagnosis of HP infection was based on the presence of HP on histopathologic examination of gastric biopsy specimens. Of 1737 cases, 504 (29%) were HP positive. The HP positive case rates were 14.5%, 26.9%, and 33.6% in the 0-6, 7-12, and 13-18 age groups, respectively. H. pylori positivity was detected in 65.7% of patients with duodenal ulcers, and the relationship between duodenal ulcers and HP positivity was significant (P < .001). The average HP positivity rates were 44%, 28.6%, and 24.2% in 2007-2012 (group 1), 2013-2017 (group 2), and 2018-2022 (group 3). H. pylori positivity rates significantly decreased in years (P = .001/P = .056/P < .001). We found that the frequency of HP infection in children decreased in our region over the years. Helicobacter pylori positivity was higher in older than younger children. A decrease in HP frequency prevalence may be possible in parallel with awareness and socioeconomic development.

Association between Helicobacter pylori infection, MASLD, and liver fibrosis in patients with severe obesity: a single-center experience.

Our study sought to evaluate if an association exists between Helicobacter pylori (H. pylori), metabolic dysfunction- associated steatotic liver disease (MASLD), and liver fibrosis in patients with severe obesity (BMI > 35). Our retrospective study included 584 patients over the age of 18years with severe obesity, who underwent preoperative liver transient elastography (VCTE), upper endoscopy, blood work, and intra-operative liver biopsy concurrent with bariatric surgery at a single institution from July 2020 to September 2021. Liver fibrosis scores including FIB-4, APRI, NAFLD fibrosis score, BARD score, AST: ALT ratio, and NAFLD activity score (NAS) were calculated from the laboratory results and liver biopsy findings. The presence or absence of H. pylori was determined based on gastric biopsies obtained during upper endoscopy. Other variables collected included age, gender, mean preoperative weight, BMI, and the presence or absence of comorbidities. Student's t-test and non-parametric testing were used for the analysis of continuous variables and Chi-square analysis was used for categorical data. Of the 584 patients, 14.7% were H. pylori positive and 85.3% were negative. Liver fibrosis scores including FIB-4, APRI, and NAFLD fibrosis scores were significantly higher in the positive group (p < 0.05), but there was no difference in AST: ALT ratio and BARD score. A significantly higher VCTE steatosis and fibrosis scores were noted in the H. pylori-positive group (p < 0.05). Similarly, a significantly higher NAS (NAFLD activity score) on liver biopsies was noted in the positive group, with all the individual components of NAS (steatosis, lobular inflammation, and hepatocyte ballooning) being significantly higher in the positive group (p < 0.05). A significantly higher incidence of fibrosis on liver biopsies was noted in the positive group overall and across all stages of fibrosis (p < 0.05). There were no significant differences between the groups in relation to gender, mean weight, BMI, presence of comorbidities including Diabetes Mellitus, and laboratory values. Our study demonstrates that H. pylori colonization or infection is associated with a higher risk of development of MASLD and progression to fibrosis. Further, population-based studies are needed to corroborate our findings.

Effectiveness of serological markers of gastric mucosal atrophy in the gastric precancer screening and in cancer prevention.

New markers are needed to improve the effectiveness of serological screening for atrophic gastritis. To develop a cost-effective method for serological screening of atrophic gastritis with a high level of sensitivity. Of the 169 patients with atrophic gastritis, selected by the visual endoscopic Kimura-Takemoto method, 165 showed histological mucosal atrophy using the updated Kimura-Takemoto method. All 169 patients were examined for postprandial levels of gastrin-17 (G17) and pepsinogen-1 (PG1) using GastroPanel® (Biohit Plc, Helsinki, Finland). We used the histological standard of five biopsies of the gastric mucosa, in accordance with the Kimura-Takemoto classification system to assess the sensitivity of G17 in detecting gastric mucosal atrophy. We also compared the morpho-functional relationships between the detected histological degree of gastric mucosal atrophy and the serological levels of G17 and PG1, as the markers of atrophic gastritis. The sensitivity of postprandial G17 was 62.2% for serological levels of G17 (range: 0-4 pmol/L) and 100% for serological G17 (range: 0-10 pmol/L) for the detection of monofocal severe atrophic gastritis. No strong correlation was found between the levels of PG1 and degree of histological atrophy determined by the Kimura-Takemoto classification system to identify the severity of mucosal atrophy of the gastric corpus. In the presented clinical case of a 63-year-old man with multifocal atrophic gastritis, there is a pronounced positive long-term dynamics of the serological marker of atrophy - postprandial G17, after five months of rennet replacement therapy. Serological screening of multifocal atrophic gastritis by assessment of postprandial G17 is a cost-effective method with high sensitivity. Postprandial G17 is an earlier marker of regression of atrophic gastritis than a morphological examination of a gastric biopsy in accordance with the Sydney system. Therefore, postprandial G17 is recommended for dynamic monitoring of atrophic gastritis after treatment.

Updated joint ESPGHAN/NASPGHAN guidelines for management of Helicobacter pylori infection in children and adolescents (2023).

Evolving epidemiological data and increasing antibiotic resistance mandate anupdate of the European and North American Societies of Pediatric Gastroenterology, Hepatology and Nutrition guidelines. Certainty of evidence and strength of recommendations were rated by experts according to the Grading of Recommendation Assessment, Development, and Evaluation approach. PICO (patient population, intervention, comparator, and outcome) questions were developed and voted on by the group. Recommendations were formulated using the Evidence to Decision framework. The current literature supports many of the previous recommendations and several new recommendations. Invasive testing with strain antimicrobial susceptibility analysis is recommended for the diagnosis and selection of eradication therapy for H. pylori infection. Molecular methods are acceptable for detection of infection and of antibiotic resistance in gastric biopsy specimens. Reliable, noninvasive tests can be used as a screening method for children with history of gastric cancer in a first-degree relative. When investigating causes of chronic immune thrombocytopenic purpura, testing for H. pylori is no longer recommended. When investigating other diseases such as inflammatory bowel disease, celiac disease, or eosinophilic esophagitis, specific diagnostic biopsies for H. pylori infection are not indicated. However, if H. pylori is an incidental finding, treatment may be considered after discussing the risks and benefits. Treatment should be based on antibiotic antimicrobial susceptibility testing and, if unavailable, regimens containing clarithromycin should be avoided. Due to decreasing prevalence of infection, increasing challenges with antibiotic resistance, and emerging evidence regarding complications of infection, clinicians must be aware of these recommended changes to appropriately manage H. pylori infection and its clinical sequelae in children.

Whole-genome sequencing of Helicobacter pylori isolates from Native American gastric biopsy specimens.

Helicobacter pylori infection has been linked to gastrointestinal diseases including gastric cancer. High rates of H. pylori infection and gastric cancer have been reported in indigenous populations within the United States. We report whole-genome sequencing of three H. pylori isolates originating from Native American patients presenting with gastric disease.

The road to a world-unified approach to the management of patients with gastric intestinal metaplasia: a review of current guidelines

ObjectiveDuring the last decade, the management of gastric intestinal metaplasia (GIM) has been addressed by several distinct international evidence-based guidelines. In this review, we aimed to synthesise these guidelines and...