The Duodenal Microenvironment in Functional Dyspepsia

Area of Science:

• Gastroenterology
• Immunology
• Microbiology

Background:

• Functional dyspepsia (FD) is a prevalent chronic gastrointestinal disorder with elusive pathophysiology.
• Recent research indicates duodenal microenvironment alterations in FD patients.
• Understanding these changes is crucial for developing effective treatments.

Purpose of the Study:

• To review the duodenal microenvironment in homeostasis and FD.
• To highlight consistent findings and discrepancies across studies.
• To explore potential triggers for duodenal alterations in FD.

Main Methods:

• Literature review focusing on duodenal microenvironment in FD.
• Analysis of molecular and cellular changes in the duodenal mucosa.
• Synthesis of evidence regarding barrier function and immune activation.

Main Results:

• Consistent findings include an impaired duodenal barrier and duodenal immune activation in FD.
• Specific immune cells like eosinophils and mast cells show mucosal activation.
• Potential triggers identified include psychological factors, luminal changes, and food.

Conclusions:

• Evidence suggests molecular and cellular changes in the duodenal microenvironment of FD patients.
• An impaired duodenal barrier and immune activation challenge the purely functional classification of FD.
• These findings offer novel therapeutic targets for FD treatment.