Lactobacillus reuteri Reduces the Severity of Experimental Autoimmune Encephalomyelitis in Mice by Modulating Gut

Baokun He1, Thomas K Hoang1, Xiangjun Tian2

  • 1Division of Gastroenterology, Departments of Pediatrics, The University of Texas Health Science Center at Houston-McGovern Medical School, Houston, TX, United States.

Insights

Probiotic Lactobacillus reuteri (L. reuteri) eased multiple sclerosis symptoms in a mouse model by reducing harmful immune cells and restoring gut bacteria diversity. This suggests L. reuteri may help manage MS severity.

Area of Science:

  • Immunology
  • Microbiology
  • Neuroscience

Background:

  • The gut microbiome influences immune function and is linked to multiple sclerosis (MS).
  • The potential of microbiota modulation for MS prevention or treatment is largely unexplored.

Purpose of the Study:

  • To investigate the therapeutic potential of probiotic Lactobacillus reuteri (L. reuteri) in experimental autoimmune encephalomyelitis (EAE), an animal model of MS.
  • To determine the effects of L. reuteri on immune cell populations and gut microbiota composition in EAE.

Main Methods:

  • Administration of L. reuteri DSM 17938 to mice with EAE.
  • Assessment of T helper 1 (TH1) and T helper 17 (TH17) cell populations and their associated cytokines (IFN-γ, IL-17).
  • Analysis of gut microbiota diversity and composition using 16S rRNA sequencing.

Main Results:

  • L. reuteri treatment ameliorated EAE development and reduced TH1/TH17 cell responses and associated cytokines.
  • EAE-induced loss of gut microbiota diversity was restored by L. reuteri treatment.
  • Specific bacterial genera (Bifidobacterium, Prevotella, Lactobacillus) were negatively correlated with EAE severity, while others (Anaeroplasma, Rikenellaceae, Clostridium) were positively correlated. L. reuteri modulated these taxa.

Conclusions:

  • Probiotic L. reuteri modulates gut microbiota and immune responses in the EAE model.
  • L. reuteri demonstrates potential as a therapeutic candidate for modifying MS severity.

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