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Mechanisms of Tolerance Induction.

Anna Nowak-Węgrzyn1, Pantipa Chatchatee

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Annals of Nutrition & Metabolism
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Summary

Early introduction of peanut and egg can prevent food allergies in infants with eczema, by leveraging oral tolerance pathways. Further research is needed to optimize various prevention and treatment strategies.

Keywords:
Atopic dermatitisDesensitizationEczemaFood allergyFood allergy preventionFood allergy treatmentFood hypersensitivityGut-associated lymphoid tissueMicrobiotaOral tolerancePrebioticsProbiotics

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Area of Science:

  • Immunology
  • Pediatrics
  • Dermatology

Background:

  • Food allergies often stem from a failure of oral tolerance, particularly in infants.
  • Exposure to allergens like peanut and egg through inflamed skin (epicutaneous exposure) in infants with severe atopic dermatitis is a risk factor for developing allergies.
  • Current evidence suggests early oral feeding of peanut and egg may protect against food allergies in children with eczema.

Purpose of the Study:

  • To review the role of epicutaneous exposure versus oral tolerance in infant food allergy development.
  • To discuss current and emerging strategies for preventing and treating food allergies, including dietary interventions and immunotherapy.

Main Methods:

  • Review of existing scientific literature and clinical guidelines.
  • Analysis of the mechanisms underlying oral tolerance and epicutaneous sensitization.
  • Evaluation of preventive strategies such as early allergen introduction and skin barrier repair.

Main Results:

  • Epicutaneous allergen exposure in infants with compromised skin barriers increases allergy risk.
  • Early oral introduction of peanut and egg is recommended for infants with eczema to prevent peanut allergy.
  • Food immunotherapy (oral, epicutaneous, sublingual) shows promise for desensitization but not permanent tolerance.

Conclusions:

  • Restoring skin barrier function and manipulating gut microbiota are potential preventive approaches.
  • Further rigorous clinical trials are essential to determine optimal strategies for food allergy prevention and treatment.
  • Understanding the interplay between skin barrier, gut microbiome, and oral tolerance is key to managing food allergies.