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The bilateral responsiveness between intestinal microbes and IgA.

Andrew J Macpherson¹, Yasmin Köller¹, Kathy D McCoy¹

¹Maurice Müller Laboratories (DKF), Universitätsklinik für Viszerale Chirurgie und Medizin Inselspital, Murtenstrasse 35, University of Bern, 3010 Bern, Switzerland.

Trends in Immunology

|July 15, 2015

Summary

Secretory immunoglobulin A (IgA) shapes the gut microbiota composition. Understanding IgA binding to specific microbes offers insights into gut health and diseases linked to microbial imbalance (dysbiosis).

Keywords:

IgA Peyer's patch commensal microbiota follicular dendritic cells follicular helper T cells follicular regulatory T cells germinal centres isolated lymphoid follicles somatic hypermutation

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Area of Science:

Immunology
Microbiology
Gastroenterology

Background:

The immune system maintains a homeostatic relationship with the gut microbiota.
Secretory immunoglobulin A (IgA) is the most abundant immunoglobulin at mucosal surfaces, playing a key role in host-microbe interactions.
Recent research highlights IgA's influence on intestinal microbiota composition and its potential in assessing microbial inflammatory capacity.

Purpose of the Study:

To review the role of IgA in shaping the intestinal microbiota.
To explore strategies for characterizing IgA-binding bacteria and their inflammatory potential.
To discuss the determinants of IgA responsiveness and its implications for dysbiosis-related diseases.

Main Methods:

Literature review of recent studies on IgA and the gut microbiota.
Analysis of current understanding of IgA repertoire and response pathways.
Examination of factors influencing IgA coating of specific intestinal microbes.

Main Results:

IgA plays a central role in maintaining the homeostatic relationship between the host and the intestinal microbiota.
Specific intestinal microbes are selectively coated with IgA, suggesting targeted immune surveillance.
Characterizing IgA-binding bacteria can help evaluate their inflammatory potential.

Conclusions:

IgA actively shapes the gut microbial community.
Understanding the mechanisms behind IgA specificity may provide critical insights into the pathogenesis of diseases associated with gut dysbiosis.
Targeting IgA-microbe interactions could offer novel therapeutic strategies for inflammatory and metabolic diseases.