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Area of Science:

  • Immunology
  • Microbiology
  • Allergy Research

Background:

  • The adaptive immune response to intestinal microbiota in healthy humans is not well understood.
  • Immune responses to gut microbes are implicated in various diseases.

Purpose of the Study:

  • To evaluate the adaptive immune response to intestinal microbiota in healthy adults.
  • To compare this response in children and mothers at risk for allergic disease.

Main Methods:

  • Collected human serum from adults and children (birth to 7 years).
  • Assessed serum immunoglobulin G (IgG) response to intestinal microbiota antigens using a novel protein microarray.

Main Results:

  • Most subjects showed IgG reactivity to common microbial antigens.
  • Atopic adults had significantly lower seroreactivity.
  • Healthy infants displayed the highest IgG reactivity, developing between 6-12 months and peaking at 2 years.
  • Low infant IgG responses to specific microbial antigens correlated with childhood allergy development.

Conclusions:

  • Allergic individuals exhibit a perturbed adaptive immune response to microbiota antigens.
  • These immune alterations are detectable in childhood.
  • Adequate immune system stimulation by microbiota may be crucial for preventing immune-mediated diseases.