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Updated: Jun 11, 2026

T Cells Capture Bacteria by Transinfection from Dendritic Cells
Published on: January 13, 2016
Human mucosal associated invariant T cells detect bacterially infected cells
Marielle C Gold1, Stefania Cerri, Susan Smyk-Pearson
1Division of Pulmonary and Critical Care Medicine, Oregon Health & Science University, Portland, Oregon, United States of America. goldm@ohsu.edu
Mucosal associated invariant T (MAIT) cells, a type of CD8+ T cell, are crucial for controlling Mycobacterium tuberculosis (Mtb) infection. These cells are decreased in active tuberculosis patients but enriched in the lungs, suggesting a key role in bacterial infection detection.
Area of Science:
- Immunology
- Microbiology
- Cellular Biology
Background:
- Control of Mycobacterium tuberculosis (Mtb) infection relies on Th1-type immunity, with CD8+ T cells playing a distinct role.
- Mtb-reactive CD8+ T cells are found in both infected and uninfected individuals.
Purpose of the Study:
- To investigate the characteristics and function of Mtb-reactive CD8+ T cells.
- To determine the role of mucosal associated invariant T (MAIT) cells in tuberculosis infection.
Main Methods:
- Limiting dilution analysis to quantify Mtb-reactive CD8+ T cells.
- T-cell receptor (TCR) and MHC restriction analysis.
- Direct ex vivo analysis of peripheral blood mononuclear cells (PBMCs) and lung tissue.
Main Results:
- Nonclassically restricted CD8+ T cells, identified as MAIT cells, express Valpha7.2 TCR and are MR1-restricted.
- MAIT cell activation occurs independently of the transporter associated with antigen processing (TAP).
- Mtb-reactive MAIT cells are reduced in PBMCs of active tuberculosis patients but enriched in lung tissue and respond to infected lung epithelial cells.
Conclusions:
- MAIT cells possess characteristics of innate immunity and can detect other bacterial infections.
- MAIT cells play a significant role in detecting bacterially infected cells.
- MAIT cells may be involved in controlling bacterial infections, including tuberculosis.
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