期刊
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
卷 133, 期 3, 页码 836-+出版社
MOSBY-ELSEVIER
DOI: 10.1016/j.jaci.2013.08.038
关键词
Allergy; grass pollen allergen; peptides; epitopes
资金
- Christian Doppler Research Association
- Biomay AG, Vienna, Austria
- Austrian Science Fund (FWF) [F4604, F4605, F4611]
- Austrian Science Fund (FWF) [W1248] Funding Source: Austrian Science Fund (FWF)
Background: The major timothy grass pollen allergen Phl p 5 belongs to the most potent allergens involved in hay fever and asthma. Objective: This study characterized immune-dominant IgE- and T-cell-recognition sites of Phl p 5. Methods: Seven peptides, P1 to P7 with a length of 31 to 38 amino acids that spanned the Phl p 5 sequence, were synthesized, characterized by circular dichroism spectroscopy, and tested for IgE reactivity, basophil activation, and T-cell reactivity. Carrier-bound peptides were studied for their ability to induce IgG antibodies in rabbits which recognize Phl p 5 or cross-reactive allergens from different grass species. Peptide-specific antibodies were tested for the capability to inhibit IgE reactivity to Phl p 5 and allergen-induced basophil activation of patients with allergy. Results: The peptides exhibited no secondary structure and showed no IgE reactivity or relevant allergenic activity, indicating that Phl p 5 IgE epitopes are conformational. Except for P3, peptide-specific IgG antibodies blocked IgE binding to Phl p 5 of patients with allergy and cross-reacted with temperate grasses. IgE inhibition experiments and molecular modeling identified several clustered conformational IgE epitopes on the N- as well as C-terminal domain of Phl p 5. P4, which stimulated the strongest T-cell and cytokine responses in patients, was not part of the major IgE-reactive regions. Conclusion: Our study shows an interesting dissociation of the major IgE- and T-cell-reactive domains in Phl p 5 which provides a basis for the development of novel forms of immunotherapy that selectively target IgE or T-cell responses.
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