The small intestine: barrier, permeability and microbiota

Area of Science:

• Gastroenterology and Immunology
• Microbiology
• Physiology

Background:

• Intestinal permeability governs the passage of substances through the gut barrier, impacting immune responses.
• The gut microbiota, a complex community of microorganisms, plays vital roles in digestion, nutrient synthesis, and immune homeostasis.
• Dysregulation of intestinal permeability and microbiota is increasingly linked to immune-mediated and extra-intestinal diseases.

Purpose of the Study:

• To provide an updated review on the physiology of intestinal permeability and microbiota.
• To elucidate the intricate relationship between intestinal barrier function, microbial composition, and disease pathogenesis.
• To emphasize the small intestine as a critical site for these interactions.

Main Methods:

• Review of current literature on intestinal physiology, barrier function, and gut microbiota.
• Analysis of the mechanisms underlying paracellular and transcellular transport.
• Synthesis of evidence linking altered permeability and microbiota to various diseases.

Main Results:

• Increased intestinal permeability can lead to heightened immune system interaction with external antigens.
• Altered gut microbiota composition is associated with impaired physiological functions and increased disease susceptibility.
• Specific immune-related diseases such as celiac disease, type 1 diabetes, asthma, and inflammatory bowel diseases are linked to these gut alterations.

Conclusions:

• A comprehensive understanding of small intestine anatomy, barrier structure, permeability modulation, and microbiota is essential.
• These factors are critical for comprehending the pathogenesis of numerous gastroenterological and non-gastroenterological diseases.
• Further research into the interplay between intestinal permeability and microbiota holds promise for novel therapeutic strategies.