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  • Title: Characterization of the allergic T-cell response to Pru p 3, the nonspecific lipid transfer protein in peach.
    Author: Schulten V, Radakovics A, Hartz C, Mari A, Vazquez-Cortes S, Fernandez-Rivas M, Lauer I, Jahn-Schmid B, Eiwegger T, Scheurer S, Bohle B.
    Journal: J Allergy Clin Immunol; 2009 Jul; 124(1):100-7. PubMed ID: 19356790.
    Abstract:
    BACKGROUND: Pru p 3, the nonspecific lipid transfer protein from peach, is an important plant food allergen that frequently induces systemic reactions. OBJECTIVE: We sought to analyze the allergic T-cell response to Pru p 3. METHODS: PBMCs from Italian and Spanish patients with peach allergy were stimulated with purified natural Pru p 3. Allergen-specific T-cell lines were used to identify T-cell epitopes of Pru p 3. Pru p 3-specific T-cell clones (TCCs) were analyzed for allergen-induced secretion of IL-4, IFN-gamma, and IL-10 and expression of the integrin beta7, a receptor critical for gut homing. RESULTS: No difference in T-cell responses of Italian and Spanish patients was found. Among several T cell-activating regions, Pru p 3(13-27), Pru p 3(34-48), Pru p 3(43-57), and Pru p 3(61-75) were most frequently recognized in 18 Pru p 3-specific T-cell lines. The majority of 32 Pru p 3-specific TCCs belonged to the T(H)2 subset. In contrast to TCCs specific for other plant food and pollen allergens, only a limited number of Pru p 3-specific TCCs produced significant amounts of IL-10. The expression of integrin beta7 on Pru p 3-specific TCCs was comparable with that observed on peanut-specific TCCs and higher compared with that seen in different pollen-specific TCCs. CONCLUSION: The T-cell response to Pru p 3 is dominated by T(H)2 cells presumably primed in the gut. The identification of relevant T cell-activating regions provides a basis for engineering hypoallergenic variants of Pru p 3 with less IgE binding and retained T-cell stimulatory capacity for safe immunotherapy of peach allergy.
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