Allergen-specific ELISA for horse IgE.

Area of Science:

• Immunology
• Veterinary Medicine
• Analytical Chemistry

Background:

• Allergen-specific immunoglobulin E (IgE) is crucial for diagnosing allergic diseases in horses.
• Existing methods for equine IgE measurement may lack sensitivity or reproducibility.
• Accurate quantification of IgE is essential for understanding equine allergic responses.

Purpose of the Study:

• To develop and validate a sensitive and reproducible enzyme-linked immunosorbent assay (ELISA) for quantifying horse IgE against specific allergens.
• To adapt a sandwich ELISA format for measuring equine IgE.
• To assess the assay's reproducibility and sensitivity.

Main Methods:

• A sandwich ELISA was employed using antigen-coated tubes with an additional polystyrene ball.
• Horse serum was incubated with rabbit anti-horse IgE, followed by biotinylated goat anti-rabbit globulin and avidin-phosphatase conjugate.
• Polystyrene pretreatment with glutaraldehyde enhanced antigen surface area and assay sensitivity.

Main Results:

• The developed ELISA demonstrated high reproducibility, attributed to glutaraldehyde pretreatment of polystyrene.
• Increased antigen surface area significantly improved the assay's sensitivity.
• Endpoint titrations were successfully compared, validating the assay's quantitative capability.

Conclusions:

• The described sandwich ELISA is a reliable and sensitive method for measuring horse IgE specific to ovalbumin, benzylpenicilloic acid, and dinitrocarboxyphenol.
• The assay's design allows for easy modification to measure other immunoglobulin classes and IgE specificities in horses.
• This assay provides a valuable tool for diagnosing and studying allergic conditions in equine populations.