Detection of blocking antibodies after hyposensitization

Area of Science:

• Immunology
• Allergy Research
• Pediatric Asthma

Background:

• Allergic asthma in children is often linked to house dust mite sensitivity.
• Hyposensitization therapy aims to reduce allergic reactions but requires monitoring antibody development.
• Detecting blocking antibodies is crucial for assessing treatment efficacy.

Purpose of the Study:

• To evaluate methods for detecting blocking antibodies in children with allergic asthma.
• To compare the sensitivity of RAST Neutralization (RAST-N), RAST Interference (RAST-I), and RAST Previous Adsorption (RAST-PA) tests.
• To assess changes in specific IgE levels after hyposensitization therapy.

Main Methods:

• Studied three RAST-based techniques: RAST-N, RAST-I, and RAST-PA.
• Administered seven months of house dust hyposensitization to allergic asthmatic children.
• Measured specific IgE levels using radioallergosorbent test (RAST) before and after treatment.

Main Results:

• The RAST Interference test detected blocking antibodies in 80% of children.
• RAST Neutralization and RAST Previous Adsorption tests showed lower detection rates (28%).
• No significant decrease in specific IgE levels was observed post-treatment.

Conclusions:

• The RAST Interference test demonstrates higher sensitivity for qualitative determination of blocking antibodies.
• Blocking antibodies may develop during hyposensitization, even without significant IgE reduction.
• Further research is needed to correlate blocking antibody levels with clinical outcomes.