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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

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The gut as communicator between environment and host: immunological consequences.

Per Brandtzaeg¹

¹Laboratory for Immunohistochemistry and Immunopathology, Centre for Immune Regulation, University of Oslo, and Department of Pathology, Oslo University Hospital, Rikshospitalet, Oslo, Norway. per.brandtzaeg@medisin.uio.no

European Journal of Pharmacology

|August 6, 2011

Summary

The mucosal immune system uses secretory antibodies (SIgA) and oral tolerance to prevent harmful reactions to food and microbes. These mechanisms maintain gut homeostasis, crucial for infant development and overall immune health.

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Area of Science:

Immunology
Gastroenterology
Human Evolution

Background:

The mucosal immune system evolved anti-inflammatory defenses: immune exclusion via secretory antibodies (SIgA, SIgM) and oral tolerance to innocuous antigens.
Immune homeostasis relies on coordinated innate and adaptive immunity, influenced by diet (Vitamin A, omega-3 fatty acids) and microbial factors.
Breast milk provides immune-modulating factors and SIgA, reinforcing the infant gut barrier.

Purpose of the Study:

To elucidate the mechanisms of mucosal immune system's anti-inflammatory functions.
To highlight the role of secretory antibodies and oral tolerance in maintaining immune homeostasis.
To emphasize the impact of dietary factors and breast milk on infant mucosal immunity.

Main Methods:

Review of evolutionary and immunological mechanisms of mucosal immunity.
Analysis of the role of secretory IgA (SIgA) and polymeric Ig receptor (pIgR).
Discussion of the influence of dietary components and breast milk on immune development.

Main Results:

Secretory antibodies (SIgA) mediate immune exclusion, preventing microbial colonization and antigen penetration.
Oral tolerance suppresses hypersensitivity to food proteins and commensal bacteria.
pIgR knockout mice lacking SIgs exhibit hyper-reactivity, underscoring the importance of SIgA.

Conclusions:

The mucosal immune system, particularly SIgA and oral tolerance, is vital for preventing harmful immune responses and maintaining gut health.
Dietary factors and breast milk significantly influence infant mucosal immune development and homeostasis.
Understanding these mechanisms is crucial for managing immune-related disorders and promoting infant well-being.