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The role of intestinal bifidobacteria on immune system development in young rats

Ping Dong1, Yi Yang, Wei-ping Wang

  • 1Children's Hospital, Pediatrics Department of Shanghai Medical College, Fudan University, Shanghai, PR China.

Early Human Development
|January 29, 2010
PubMed

Insights

Intestinal bifidobacteria significantly impact early life immunity. Supplementation promotes immune cell maturation and enhances antibody production, while minimization delays these crucial developmental processes.

Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Early life gut microbiota composition is critical for immune system development.
  • Intestinal bifidobacteria play a key role in shaping host immunity from birth.

Purpose of the Study:

  • To investigate the effects of intestinal bifidobacteria on the development of the immune system in neonatal rats.
  • To determine how manipulating bifidobacteria levels influences immune cell maturation and function.

Main Methods:

  • Neonatal Sprague Dawley rats were divided into two groups: one with minimized bifidobacteria (antibiotic-treated) and one supplemented with Bifidobacterium longum.
  • Immune development indices, including dendritic cell maturation, T cell development, cytokine production, and antibody synthesis, were assessed at 1, 3, and 6 weeks of age.

Main Results:

  • Minimizing bifidobacteria delayed dendritic cell and T cell maturation, altered cytokine profiles (increased IL-4, decreased IL-12, IL-10, IFN-γ), and reduced immunoglobulin-M production.
  • Bifidobacteria supplementation promoted dendritic cell maturation, enhanced IL-12, IL-10, and interferon-gamma (IFN-γ) mRNA expression, and increased immunoglobulin-M secretion.

Conclusions:

  • Intestinal bifidobacteria are essential for promoting dendritic cell maturation and IL-12 expression in the gut.
  • Bifidobacteria influence T cell development in the thymus, support T-helper cell type 1 responses via IFN-γ, and regulate T regulatory cell responses through IL-10.
  • These bacteria enhance antibody synthesis by peripheral blood mononuclear cells (PBMCs), contributing to both gut and systemic immunity development in early life.
Abstract

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