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Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment
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Antibiotic use in early life impairs MAIT cell-mediated immunity in adulthood

Gabrielle R LeBlanc1,2, Adam L Sobel1,2, Jonathan Melamed1,2

  • 1Department of Immunology and Microbiology, Scripps Research, La Jolla, CA, USA.

The Journal of Experimental Medicine
|December 16, 2025
PubMed

Insights

Early-life antibiotic use can harm the development of mucosal-associated invariant T (MAIT) cells by depleting gut bacteria. This impairment increases susceptibility to infections like pneumonia.

Area of Science:

  • Immunology
  • Microbiology
  • Developmental Biology

Background:

  • Mucosal-associated invariant T (MAIT) cells are crucial immune cells found in barrier tissues.
  • MAIT cells recognize microbial metabolites derived from riboflavin synthesis.
  • Early-life microbial exposure shapes MAIT cell populations.

Purpose of the Study:

  • To investigate the impact of early-life antibiotic exposure on MAIT cell development.
  • To determine if antibiotic-induced depletion of riboflavin-synthesizing commensals affects MAIT cell abundance and function.
  • To assess the consequences of impaired MAIT cell development on host susceptibility to infection.

Main Methods:

  • Identification of antibiotics that deplete riboflavin-synthesizing commensals.
  • Administration of antibiotics during a critical early-life window in mice.
  • Assessment of MAIT cell numbers and susceptibility to pneumonia.
  • Comparison with MAIT cell-deficient mice and rescue experiments with commensal administration.

Main Results:

  • Antibiotic administration during a specific early-life period impaired MAIT cell development.
  • Reduced MAIT cell abundance led to increased susceptibility to pneumonia in mice.
  • MAIT cell-deficient mice were not susceptible to early-life antibiotic effects.
  • Restoring riboflavin-synthesizing commensals during antibiotic treatment rescued MAIT cell development and immunity.

Conclusions:

  • Transient depletion of essential gut bacteria in early life can permanently affect MAIT cell development.
  • Impaired MAIT cell immunity due to early-life antibiotic exposure can heighten susceptibility to infections.
  • Restoring specific commensals can mitigate the adverse effects of antibiotics on MAIT cell development.

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