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Mucosal associated invariant T (MAIT) cells develop and are maintained by the gut microbiota. Dysbiosis can lead to MAIT cell-related diseases, suggesting therapeutic potential.

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Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Mucosal associated invariant T (MAIT) cells are innate-like T cells crucial for mucosal immunity.
  • They recognize microbial riboflavin metabolites presented by the MR1 molecule.
  • MAIT cells interact with the gut microbiota, influencing barrier function and immune homeostasis.

Purpose of the Study:

  • To review the role of the microbiota in MAIT cell development and maintenance.
  • To explore the link between microbial dysbiosis and MAIT cell pathogenicity.
  • To discuss potential therapeutic strategies involving MAIT cells and the microbiota.

Main Methods:

  • Literature review summarizing current knowledge on MAIT cells and the microbiota.
  • Analysis of mechanisms of MAIT cell activation (TCR-dependent and independent).
  • Discussion of the implications of microbial dysbiosis and immune imbalance.

Main Results:

  • The microbiota is essential for MAIT cell development and homeostasis.
  • Microbial dysbiosis, altered gut permeability, and immune imbalance contribute to MAIT cell-related diseases.
  • Human data on MAIT cell-microbiota interactions are limited.

Conclusions:

  • MAIT cells play a dual role in immunity and disease, influenced by the microbiota.
  • Dysbiosis-induced MAIT cell dysfunction is implicated in inflammatory and autoimmune conditions.
  • Targeting MAIT cells or manipulating the microbiota may offer novel therapeutic avenues.