Eosinophilic esophagitis and esophageal microbiota

Area of Science:

• Gastroenterology
• Immunology
• Microbiology

Background:

• Eosinophilic esophagitis (EoE) is a growing chronic inflammatory esophageal disease.
• Its pathogenesis remains unclear, but the esophageal microbiota is increasingly recognized as a key regulator.
• Research on EoE and its associated microbiota is a rapidly expanding field.

Purpose of the Study:

• To review existing studies on the esophageal microbiota in EoE.
• To explore potential mechanisms of microbiota-mediated EoE.
• To understand the interplay between EoE and the esophageal microbiome.

Main Methods:

• Literature review of published studies on EoE and esophageal microbiota.
• Analysis of findings regarding microbial composition and diversity in EoE patients.
• Synthesis of evidence on the role of microbiota in EoE pathogenesis and immune responses.

Main Results:

• Esophageal microbiome alterations are observed in EoE patients, notably an increase in Haemophilus and a decrease in Firmicutes.
• While alpha diversity may not significantly differ, specific bacterial changes are linked to EoE.
• Microbiota penetration can activate esophageal cells and immune responses, contributing to inflammation.

Conclusions:

• The esophageal microbiota plays a significant role in the initiation and perpetuation of EoE.
• Immune pathways, including toll-like receptors, are implicated in microbiota-driven EoE progression.
• Treatments like PPIs and corticosteroids may modulate the esophageal microbiota, but further research is needed.