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Related Experiment Video

Updated: Dec 23, 2025

Induction of Intestinal Inflammation by Adoptive Transfer of CBir1 TCR Transgenic CD4+ T Cells to Immunodeficient Mice
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Immunoregulation by the gut microbiota.

Junko Nishio1, Kenya Honda

  • 1Department of Immunology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan.

Cellular and Molecular Life Sciences : CMLS
|April 25, 2012
PubMed
Summary

The gut microbiota shapes the host immune system, with specific bacteria inducing distinct immune cell populations. These microbes are crucial for maintaining gut health and influencing overall immunity.

Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • The human gut harbors a vast commensal microbiota essential for host health.
  • The host has developed specialized immune systems to coexist with gut microbes.
  • Gut microbiota composition actively influences host immune cell development and function.

Purpose of the Study:

  • To elucidate the intricate relationship between specific commensal bacteria and host immune cell populations in the intestine.
  • To understand how gut microbes regulate the development of intestine-specific immune responses.

Main Methods:

  • This study focuses on the known interactions between specific bacterial species and immune cells, drawing from recent research findings.
  • Observational analysis of immune cell accumulation induced by defined bacterial groups.

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Main Results:

  • Segmented filamentous bacteria promote Th17 cell accumulation in the small intestine.
  • Clostridium species (clusters XIVa and IV) drive the accumulation of Foxp3(+) regulatory T cells in the large intestine.
  • These microbiota-induced immune cells play a role in maintaining intestinal homeostasis.

Conclusions:

  • Specific gut bacteria are key in directing the development of host immune cells within the intestinal tract.
  • The gut microbiota's influence extends beyond the gut, impacting systemic immunity.
  • Understanding these interactions is vital for maintaining host-microbe symbiosis and overall health.