Pathophysiology of gastrointestinal mucosal permeability

Area of Science:

• Gastroenterology
• Physiology
• Biomedical Engineering

Background:

• The intestinal mucosa presents multiple barriers to solute transport.
• These barriers include unstirred water and mucous layers, cell membranes, paracellular junctions, interstitial matrix, and endothelia.
• The epithelial barrier restricts small solutes but allows passage of larger molecules like albumin.

Purpose of the Study:

• To review the plasma clearance method for assessing intestinal permeability.
• To discuss methodological aspects, influencing factors, and the pros and cons of the clearance technique.
• To describe applications of the clearance method in studying mucosal injury models.

Main Methods:

• Plasma (or luminal) clearance measurements of water-soluble molecules.
• Analysis of factors affecting clearance, such as solute size, blood flow, and epithelial barrier permeability.
• Review of existing literature on the plasma clearance technique and its applications.

Main Results:

• The plasma clearance method is a popular technique for studying intestinal permeability.
• Solute size, blood flow, and epithelial barrier integrity significantly influence clearance measurements.
• The technique has been applied to investigate mucosal injury induced by ischemia/reperfusion, ethanol, and FMLP.

Conclusions:

• The plasma clearance method provides valuable insights into intestinal barrier function.
• Understanding factors influencing clearance is crucial for accurate interpretation of results.
• This technique is applicable to diverse research areas, including the study of gastrointestinal diseases and injury models.