Related Experiment Video
Updated: May 23, 2026
Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
Published on: March 7, 2025
microRNA profiling in duodenal ulcer disease caused by Helicobacter pylori infection in a Western population
S Lario1, M J Ramírez-Lázaro, A M Aransay
1Departament de Medicina, Digestive Diseases Service, Hospital de Sabadell, Institut Universitari Parc Taulí, Universitat Autònoma de Barcelona, Sabadell, Barcelona, Spain.
Abstract:
Although the connection of microRNAs (miRNAs) to some diseases is well established, their involvement in chronic infections such as Helicobacter pylori has received less attention. The aim was to compare miRNA expression profiling in patients with duodenal ulcer (DU) due to H. pylori infection with that in infected patients without DU and in uninfected patients. The miRNA expression profile was determined by microarrays in antral mucosal samples from well-characterized dyspeptic patients (n = 46). The most significant set of miRNAs was subsequently analysed in an independent validation group of patients (n = 42). Transcripts for IL8, IL12p40, IL12p35 and IL23p19, the signalling molecules MYD88, GATA6, SOCS2 and STAT6 and H. pylori virulence factors cagA and VacA were analysed. Microarray experiments showed that 17 miRNAs were deregulated in the mucosa of H. pylori-infected patients. No significant differences were observed between normal and DU patients. PCR confirmed the up-regulation of miR-9, miR-146a, miR-155 and miR-650 and the down-regulation of miR-96 and miR-204 in the independent validation set of patients. Importantly, miR-9, miR-96, miR-146a and miR-650 expression was specific to chronic-active gastritis. H. pylori-infected patients showed higher levels of IL8 and IL12p40 mRNAs and lower levels of GATA6 and SOCS2 mRNAs. The antral mucosa of patients with non-active or chronic-active gastritis showed significantly lower levels of GATA6, MYD88, SOCS2 and STAT6 mRNAs compared with patients without gastritis. The down-regulation of these factors was not correlated with the expression of any of the validated miRNAs. The exact role of the miRNA changes observed will require further study.
Insights
MicroRNA (miRNA) expression changes in Helicobacter pylori infection were analyzed. Specific miRNAs were linked to chronic-active gastritis, but not duodenal ulcers, in H. pylori patients.
Area of Science:
- Gastroenterology
- Molecular Biology
- Infectious Diseases
Background:
- MicroRNAs (miRNAs) are increasingly linked to various diseases.
- Their role in chronic infections like Helicobacter pylori remains underexplored.
- Helicobacter pylori infection is a common cause of gastritis and duodenal ulcers.
Purpose of the Study:
- To compare miRNA expression profiles in patients with H. pylori-induced duodenal ulcers (DU), H. pylori-infected patients without DU, and uninfected individuals.
- To identify specific miRNAs associated with H. pylori infection and gastritis.
- To investigate the correlation between miRNA expression and host inflammatory response molecules.
Main Methods:
- Microarray analysis of miRNA expression in antral mucosal samples from dyspeptic patients (n=46).
- Validation of significant miRNA findings in an independent patient cohort (n=42) using PCR.
- Analysis of mRNA transcripts for cytokines (IL8, IL12p40, IL12p35, IL23p19), signaling molecules (MYD88, GATA6, SOCS2, STAT6), and H. pylori virulence factors (cagA, VacA).
Main Results:
- Seventeen miRNAs were deregulated in H. pylori-infected patients; no significant differences were found between normal and DU patients.
- Up-regulation of miR-9, miR-146a, miR-155, and miR-650, and down-regulation of miR-96 and miR-204 were confirmed.
- miR-9, miR-96, miR-146a, and miR-650 expression was specific to chronic-active gastritis.
- H. pylori-infected patients showed altered mRNA levels of IL8, IL12p40, GATA6, and SOCS2.
- Down-regulation of GATA6, MYD88, SOCS2, and STAT6 was observed in gastritis, but not correlated with validated miRNA changes.
Conclusions:
- Specific miRNA expression profiles are associated with H. pylori infection and chronic-active gastritis.
- The observed miRNA changes are not directly linked to duodenal ulcer development in H. pylori patients.
- Further research is needed to elucidate the precise functional role of these altered miRNA expressions in the context of H. pylori infection.
More Related Videos
06:40Quantitative Polymerase Chain Reaction (qPCR)-Based Rapid Diagnosis of Helicobacter pylori Infection and Antibiotic Resistance
Published on: July 28, 2023
03:33Rapid Detection of Fecal Antigen of Helicobacter pylori Infection Based on Double Antibody Sandwich Detection Technology
Published on: May 23, 2025
Related Concept Videos
01:28Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
01:16Treating Helicobacter pylori in Peptic Ulcers: Antimicrobial Therapy
01:27Peptic Ulcer
01:24Peptic Ulcer Disease II: Pathophysiology
01:28Peptic Ulcer Disease II: Pathophysiology
Damaging agents such as Helicobacter pylori, gastric acid, pepsin, and nonsteroidal anti-inflammatory drugs (NSAIDs) can weaken the mucosal defense, allowing hydrogen ions to infiltrate back and harm epithelial cells.
01:26Gastritis II: Pathophysiology