MiR-21-5p and miR-223-3p as Treatment Response Biomarkers in Pediatric Eosinophilic Esophagitis

Area of Science:

• Gastroenterology
• Molecular Biology
• Pediatric Pathology

Background:

• Eosinophilic esophagitis (EoE) is a common pediatric condition.
• Diagnosis and monitoring often require invasive endoscopy and biopsies.
• There is a need for non-invasive biomarkers to assess disease activity and treatment response.

Purpose of the Study:

• To evaluate plasma levels of miR-21-5p and miR-223-3p as potential non-invasive biomarkers in pediatric EoE.
• To assess the correlation of these microRNAs with disease activity and response to therapy.
• To identify target genes and pathways involved in EoE pathophysiology.

Main Methods:

• Collected plasma and esophageal mucosa samples from 13 pediatric EoE patients and 8 controls at diagnosis and after treatment.
• Analyzed microRNA (miRNA) levels (miR-21-5p, miR-223-3p) and their target genes using extraction and bioinformatic analysis.
• Compared miRNA levels between EoE patients and controls, and before and after therapy.

Main Results:

• Plasma levels of miR-21-5p and miR-223-3p were significantly elevated in pediatric EoE patients compared to controls.
• These miRNA levels in plasma mirrored those in esophageal mucosa.
• Target genes of these miRNAs are involved in key signaling pathways (MAPK, Ras, FoxO) relevant to EoE.
• STAT3 and PTEN, downregulated in EoE mucosa, are implicated in related conditions.
• Following therapy, plasma and tissue miRNA levels significantly decreased, returning to control levels.

Conclusions:

• miR-21-5p and miR-223-3p show potential as complementary non-invasive biomarkers for pediatric EoE.
• These biomarkers may help reduce the reliance on endoscopy and biopsies for diagnosis and monitoring.
• Further research can validate these miRNAs for clinical application in EoE management.