Similar Localization of Conformational IgE Epitopes on the House Dust Mite Allergens Der P 5 and Der P 21 Despite Limited IgE Cross-reactivity

Overview

Journal Allergy

Specialty Allergy & Immunology

Date 2018 Jan 11

PMID 29319884

Citations 11

Authors

M Curin

T Garmatiuk

Y Resch-Marat

K W Chen

G Hofer

K Fauland

W Keller

W Hemmer

S Vrtala

M Focke-Tejkl

R Valenta

Affiliations

Soon will be listed here.

Abstract

Background: Due to high IgE recognition frequency and high allergenic activity, Der p 5 and Der p 21 are clinically important house dust mite (HDM) allergens. The objective of this study was to characterize the immunodominant IgE epitopes of Der p 5 and Der p 21 responsible for their high allergenic activity.

Methods: A panel of 12 overlapping peptides spanning the Der p 5 and Der p 21 sequence were synthesized to search for sequential IgE epitopes by direct testing for allergic patients' IgE reactivity. Peptide-specific antibodies raised in rabbits were used in inhibition studies for localizing conformational IgE epitopes which were visualized on the surfaces of the allergen structures by molecular modelling. IgE cross-reactivity between the allergens was investigated by IgE inhibition studies.

Results: Immunodominant IgE epitopes defined by allergic patients' IgE on Der p 5 and Der p 21 were primarily of the conformational, discontinuous type including N- and C-terminal portions of the protein. They could be located on each allergen on one area with similar localization, but despite similar structure of the allergens, no relevant IgE cross-reactivity could be detected.

Conclusion: Our study shows that Der p 5 and Der p 21 contain a major conformational IgE epitope-containing area located on similar portions of their structure, but they lack relevant IgE cross-reactivity. These data are important for the development of modern allergy vaccines based on defined molecules for allergen-specific immunotherapy of HDM allergy.

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