Grass allergens : a preliminary characterization by means of RAST-based allergen assay methods

Area of Science:

• Allergy and Immunology
• Biochemistry
• Molecular Biology

Background:

• Grass pollen allergens are a significant cause of allergic rhinitis.
• Understanding allergen heterogeneity and cross-reactivity is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To separate and characterize grass pollen allergens from Festuca elatior, Lolium perenne, and Phleum pratense.
• To investigate the IgE specificity and cross-reactivity of these allergen groups.

Main Methods:

• Gel filtration and ion exchange chromatography for allergen separation.
• Radioallergosorbent test (RAST)-based titration for allergen quantitation.
• RAST-inhibition assays to assess IgE specificity and cross-reactivity.
• Polyacrylamide gel electrophoresis (PAGE) for heterogeneity analysis.

Main Results:

• Allergens were separated into groups based on molecular weight and net electric charge.
• Polyacrylamide gel electrophoresis revealed heterogeneity within allergen groups.
• Significant cross-reactivity was observed between different allergen groups, even those with distinct physical properties.

Conclusions:

• Grass pollen allergens exhibit considerable heterogeneity and cross-reactivity.
• Molecular weight and net electric charge are not sufficient to fully distinguish allergenic specificities.
• Further research is needed to elucidate the precise structures responsible for cross-reactivity in grass pollen allergy.