Immunologic changes during desensitization with cow's milk: How it differs from natural tolerance or nonallergic...

Area of Science:

• Immunology
• Allergy and Immunology
• Pediatric Allergy

Background:

• Oral immunotherapy (OIT) is an emerging treatment for food allergies, including IgE-mediated cow's milk allergy (CMA).
• Understanding the immunological changes induced by OIT is crucial for optimizing treatment strategies.

Purpose of the Study:

• To investigate the effects of OIT on blocking antibodies, T cell regulation, and cytokine profiles in children with IgE-mediated CMA.
• To compare these immune responses with those in children on a dairy elimination diet, those who developed natural tolerance, and healthy controls.

Main Methods:

• A study involving 59 children with IgE-mediated CMA and 18 healthy controls, divided into OIT, elimination, tolerance, and control groups.
• Measurements included milk-specific IgE, IgG4, IgA, skin prick test diameters, Treg cell percentages (CD4+CD25+FoxP3+), and cytokine levels (IL-10, TGF-β, IL-2, IL-4, IL-13).

Main Results:

• OIT led to increased total IgE and specific IgA and IgG4 levels, with a decrease in specific IgE.
• Post-OIT, CD4+CD25+FoxP3+ Treg cell percentages remained similar, while IL-10 levels increased significantly, and TGF-β levels showed a non-significant increase.
• FoxP3 mRNA expression in OIT patients was comparable to those with natural tolerance and correlated positively with TGF-β.

Conclusions:

• OIT appears to induce a successful immune response in CMA by potentially blocking IgE-mediated allergen presentation via blocking antibodies.
• The observed increase in IL-10 and TGF-β cytokine responses, along with FoxP3 mRNA expression similar to natural tolerance, suggests a promising immunomodulatory effect.
• Further research is warranted to fully elucidate the mechanisms and long-term implications of OIT in managing food allergies.