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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
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Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance

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Microarray analysis of gastric mucosa among children with Helicobacter pylori infection

Tamaki Ikuse1, Yoshikazu Ohtsuka, Takahiro Kudo

  • 1Department of Pediatric and Adolescent Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.

Pediatrics International : Official Journal of the Japan Pediatric Society
|February 11, 2012
PubMed

Insights

Pediatric Helicobacter pylori infection involves significant changes in gastric immune gene expression. Key immune response genes like lipocalin-2 (Lcn2) and chemokines were upregulated, while pepsinogens were downregulated in infected children.

Area of Science:

  • Pediatric Gastroenterology
  • Immunology
  • Molecular Biology

Background:

  • Helicobacter pylori infection can occur in early childhood, but the associated mucosal immune response in children remains poorly understood.
  • Understanding pediatric immune responses is crucial for managing H. pylori-related gastritis and long-term health outcomes.

Purpose of the Study:

  • To investigate the immune response in the gastric mucosa of children infected with H. pylori.
  • To identify specific genes involved in the pediatric immune response to H. pylori infection.

Main Methods:

  • Gastric biopsies were obtained from 12 children (6 H. pylori-positive, 6 H. pylori-negative) undergoing endoscopy.
  • Microarray analysis and real-time polymerase chain reaction (PCR) were used to assess gene expression changes in the gastric mucosa.

Main Results:

  • Microarray analysis revealed significant differential gene expression in the antrum and corpus of infected children.
  • Real-time PCR confirmed upregulation of lipocalin-2 (Lcn2), C-C motif chemokine ligand (CCL) 18, C-X-C motif chemokine ligand (CXCL) 9, and CXCL11.
  • Pepsinogen (PG) I and PGII expression was found to be downregulated in H. pylori-infected pediatric gastric samples.

Conclusions:

  • Lipocalin-2 (Lcn2), CCL18, CXCL9, CXCL11, PGI, and PGII are identified as important players in childhood H. pylori infection.
  • These findings highlight specific molecular pathways involved in the pediatric immune response to H. pylori.
  • Further research can explore therapeutic targets based on these identified genes.
Abstract

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