Cashew Tree Pollen: An Unknown Source of IgE-Reactive Molecules

Area of Science:

• Immunology
• Proteomics
• Allergology

Background:

• Pollinosis is underdiagnosed in tropical regions.
• Cashew tree pollen is a suspected allergen, but its specific IgE-binding molecules are unknown.
• Understanding cashew pollen allergens can aid in diagnosing and treating allergic rhinitis.

Purpose of the Study:

• To identify IgE-reactive molecules in cashew tree pollen.
• To establish a proteomic profile of cashew pollen.
• To investigate cashew pollen as a cause of allergic rhinitis in Brazil.

Main Methods:

• Shotgun proteomic analysis to identify pollen proteins.
• Bioinformatic analysis using Gene Ontology and Allfam databases.
• 2D-based approach and ELISA to detect IgE-binding proteins in patients' serum.

Main Results:

• Identified 830 proteins in cashew pollen, with 39 high-confidence candidates.
• Nine proteins were assigned to allergenic families.
• Detected 20 IgE-reactive proteins, including a Bet v 6 homolog, in patients with allergic rhinitis.

Conclusions:

• Cashew tree pollen contains multiple IgE-binding proteins, including known allergens.
• Cashew pollen is a significant trigger for allergic rhinitis in northeastern Brazil.
• Elucidating these allergenic molecules can enhance diagnostic accuracy and therapeutic strategies for patients.