Intestinal epithelial hyperpermeability. Mechanisms and relevance to disease

Area of Science:

• Gastroenterology and Cell Biology
• Investigating the molecular mechanisms of intestinal barrier function.

Background:

• Pathologic increases in intestinal permeability to hydrophilic macromolecules are observed in diverse clinical conditions.
• Gut barrier dysfunction's clinical significance is under investigation, but it likely contributes to inflammatory bowel disease and post-cardiopulmonary bypass complications.

Purpose of the Study:

• To explore the multifaceted mechanisms underlying intestinal hyperpermeability.
• To identify common mechanistic themes in different clinical entities exhibiting gut barrier dysfunction.

Main Methods:

• Review of existing literature on intestinal permeability and gut barrier function.
• Analysis of proposed molecular and cellular mechanisms contributing to hyperpermeability.

Main Results:

• Intestinal hyperpermeability is associated with numerous clinical conditions, suggesting a significant role for gut barrier dysfunction.
• Multiple factors, not a single mechanism, likely cause intestinal hyperpermeability, including mesenteric ischemia and cytokine effects.
• Key common mechanistic themes include adenosine triphosphate (ATP) depletion, increased intracellular calcium ([Ca2+]i), and enterocyte cytoskeletal derangements.

Conclusions:

• Alterations in intestinal epithelial permeability are implicated in a spectrum of diseases.
• Understanding the common mechanistic pathways, such as ATP depletion and cytoskeletal changes, is crucial for addressing intestinal hyperpermeability.
• Further research is needed to fully delineate the clinical significance and therapeutic targets for gut barrier dysfunction.