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Related Experiment Videos

Studies on antigens from timothy pollen.

B Cramer-Kleinert, C H Schneider

    Developments in Biological Standardization
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Low molecular weight timothy pollen fractions showed significant activity in skin tests and RAST inhibition assays. Fragmentation reduced RAST inhibition but increased skin reactivity, indicating complex allergenicity.

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    Area of Science:

    • Immunology
    • Allergen analysis
    • Biochemistry

    Background:

    • Timothy pollen is a common allergen responsible for allergic rhinitis and asthma.
    • Understanding the specific allergenic components of timothy pollen is crucial for effective diagnosis and treatment.
    • Fractionation and characterization of pollen extracts are essential for identifying key allergens.

    Purpose of the Study:

    • To investigate the allergenic potential of different molecular weight fractions of timothy pollen extract.
    • To evaluate the impact of chemical and enzymatic fragmentation on allergenicity.
    • To compare the results obtained from RAST inhibition and passive cutaneous anaphylaxis (PCA) assays.

    Main Methods:

    • Preparation of dialyzable and non-dialyzable fractions from neutral timothy pollen extracts.

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  • Fragmentation of extracted material using chemical reagents and hydrolytic enzymes.
  • Assessment of allergenic activity using human and guinea pig RAST inhibition and PCA assays.

    • Main Results:

    • Low molecular weight fractions exhibited significant activity in both PCA and RAST inhibition.
    • Fragmented materials showed reduced inhibitory capacity in RAST but enhanced PCA elicitation.
    • Enzymatic modifications did not always result in detectable changes via RAST inhibition, despite its sensitivity.

    Conclusions:

    • Multiple antigenic specificities are involved in the allergic reactions to timothy pollen.
    • Low molecular weight components and fragmentation products possess distinct allergenic properties.
    • PCA and RAST inhibition assays provide complementary information on allergenicity and antigenic modifications.