Shared allergenic and antigenic determinants in Alternaria and Stemphylium extracts

Area of Science:

• * Immunology
• * Allergen characterization
• * Mycology

Background:

• * Alternaria and Stemphylium are common fungi implicated in allergic diseases.
• * Understanding shared allergens between these fungi is crucial for accurate diagnosis and immunotherapy.

Purpose of the Study:

• * To compare allergenic and antigenic components of Alternaria and Stemphylium extracts.
• * To investigate the role of Alt-I as a shared allergen.

Main Methods:

• * Skin-test responses, RAST (Radioallergosorbent Test) binding, RAST inhibition assays.
• * Repetitive absorption experiments, double-antibody radioimmunoassay.
• * Double-immunodiffusion, crossed, and crossed-line immunoelectrophoresis.

Main Results:

• * Positive correlation between skin-test responses to Alternaria and Stemphylium.
• * RAST and inhibition assays demonstrated shared allergenic determinants, with Alt-I identified as a major common fraction.
• * Immunochemical analyses confirmed significant antigenic cross-reactivity between Alternaria and Stemphylium extracts.

Conclusions:

• * Alternaria and Stemphylium extracts contain multiple shared allergenic and antigenic determinants.
• * Alt-I is a significant shared allergen between these two fungal extracts.
• * Findings support cross-reactivity and have implications for allergy diagnostics and treatment.