Allergens from rye pollen (Secale cereale). II. Characterization and partial purification

Area of Science:

• Allergen research
• Immunology
• Biochemistry

Background:

• Rye pollen is a common allergen responsible for seasonal allergic rhinitis and asthma.
• Identifying specific allergenic proteins is crucial for developing targeted immunotherapies and diagnostics.

Purpose of the Study:

• To identify and characterize allergenic components in rye pollen.
• To compare the allergenic potential of proteins extracted over different incubation periods.
• To isolate and test the reactivity of highly purified allergenic fractions.

Main Methods:

• Rye pollen was subjected to two extraction protocols: short-term (30 min, extract A) and long-term (18.5 h, extract B).
• Both extracts were fractionated using DEAE ion-exchange chromatography.
• Allergen presence was detected using dot-immunobinding, and protein profiles were analyzed by SDS-PAGE. Skin prick tests were performed on allergic patients.

Main Results:

• Proteins in peaks 1 and 2 (unretained) and those eluted at 0.2 M NaCl from extract B contained the highest allergen proportion.
• SDS-PAGE revealed a highly purified 28 kDa protein band in peak 2 of extract B.
• This 28 kDa band elicited a stronger positive skin prick test response in allergic patients compared to the crude extract.

Conclusions:

• Longer incubation periods (extract B) yield a higher concentration of allergenic rye pollen proteins.
• A specific 28 kDa protein is a major allergen in rye pollen, showing potent reactivity in allergic individuals.
• This purified 28 kDa allergen holds potential for improved diagnostic tools and targeted allergy treatments.