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Related Experiment Video

Updated: Feb 6, 2026

Murine Fecal Isolation and Microbiota Transplantation

Murine Fecal Isolation and Microbiota Transplantation

Published on: May 26, 2023

IgA Responses to Microbiota.

Jeffrey J Bunker¹, Albert Bendelac¹

¹Committee on Immunology, University of Chicago, Chicago, IL 60637, USA; Department of Pathology, University of Chicago, Chicago, IL 60637, USA.

|August 23, 2018

Summary

This summary is machine-generated.

The gastrointestinal mucosa employs two distinct immunoglobulin A (IgA) antibody responses: a broad, homeostatic response to commensal bacteria and a high-affinity response to pathogens and vaccines.

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Area of Science:

Immunology
Microbiology
Gastroenterology

Background:

The gut mucosa hosts a vast community of resident bacteria, necessitating robust immune surveillance.
Immunoglobulin A (IgA) antibodies are abundant in the mucosa, coating a significant portion of the commensal microbiota.
Recent research has identified specific bacteria targeted by IgA under both healthy and diseased states.

Purpose of the Study:

To review the current understanding of IgA biology in the gastrointestinal mucosa.
To present a framework distinguishing two coexisting types of humoral immunity.
To highlight key questions regarding the generation and function of distinct IgA responses.

Main Methods:

Review of existing literature on IgA biology and mucosal immunity.
Analysis of findings related to commensal microbiota coating and pathogen-specific antibody responses.
Synthesis of a conceptual model for dual humoral immunity in the gut.

Main Results:

Two distinct types of IgA responses coexist in the gastrointestinal mucosa.
Homeostatic IgA responses are characterized by a polyreactive repertoire targeting a broad subset of microbiota.
Pathogen and vaccine-elicited IgA responses are high-affinity and T cell-dependent.

Conclusions:

The gastrointestinal mucosa utilizes distinct humoral immune strategies for managing commensal microbiota and responding to external threats.
Understanding the generation and effector functions of polyreactive IgA is crucial.
Further research is needed to elucidate how these distinct IgA responses are integrated during homeostasis and disease.