Mechanisms of Allergy
Hypersensitivity reactions after respiratory sensitization: Effect of intranasal peptides containing T-cell epitopes,☆☆

https://doi.org/10.1067/mai.2002.128485Get rights and content

Abstract

Background: The intranasal administration of peptides containing T-cell epitopes has been shown to inhibit T-cell and antibody responses of mice injected with allergen, but responses to respiratory sensitization might be regulated differently. Objective: This study was designed to examine the effect of intranasal peptide on antigen-induced lung inflammatory responses and delayed hypersensitivity after sensitization by the respiratory mucosa or without sensitization. Methods: Mice were treated with an intranasal tolerizing regimen of a peptide containing the major T-cell epitope of Der p 1. Delayed hypersensitivity and lung inflammation to challenge with Der p 1 was measured either without further treatment or after sensitization induced by means of the intranasal administration of Der p 1 with a mutated enterotoxin adjuvant. Lung inflammatory responses were examined by means of lavage and histologic section, and delayed hypersensitivity responses were measured on the basis of ear swelling. Results: Delayed hypersensitivity reactions were induced in mice treated with intranasal peptide, and large reactions were found in mice given intranasal peptide and sensitized with intranasal Der p 1 and adjuvant. Mice pretreated with peptide and sensitized with Der p 1 had an increased lymphocytic infiltration after allergen-specific challenge, as measured by means of bronchoalveolar lavage and shown histologically. These hypersensitivity results are in contrast to previous data that show tolerance to injected antigen. Conclusions: Although the intranasal administration of a peptide containing a T-cell epitope markedly inhibits responses to sensitization produced by the injection of allergen, the peptide induces immune responses and increases hypersensitivity to respiratory sensitization. (J Allergy Clin Immunol 2002;110:610-6.)

Section snippets

Mice

Specific pathogen-free C57BL/6 mice (6-8 weeks old) were obtained from the Animal Resource Centre (Murdoch, Australia).

Antigens and peptides

Der p 1 was isolated from a 20% solution of spent mite media (a gift from CSL-Ltd, Melbourne, Australia) dissolved in PBS by means of affinity chromatography with mAb 4C1 provided by Dr M. D. Chapman (Indoor Biotechnologies, Charlottesville, Va). Human serum albumin (HSA) was purchased from Sigma (St Louis, Mo). The peptide representing residues 114-128 of Der p 1.010119

Results

Mice were given 5 daily doses of the Der p 1 peptide to examine the effect of intranasal peptide treatment on respiratory sensitization, and after 10 days, they were sensitized by means of an intranasal administration of Der p 1 in mutant toxin. After a further 4 weeks, the mice were challenged with intranasal administration of 100 μg of Der p 1 on 3 consecutive days, and bronchoalveolar lavage fluid and lung histologic specimens were examined the next day. The inflammation was compared with

Discussion

The intranasal administration of Der p 1 peptide has been shown to profoundly inhibit IgE antibody responses of mice injected with Der p 1 in alum12 and to inhibit delayed hypersensitivity and IL-2, IFN-γ, and IL-5 responses of mice immunized with the allergen in CFA.11, 12 This concurs with studies of others with intranasal administration of allergen1, 2, 3, 4, 5 or peptides.13, 14, 15 In contrast, when the sensitization was performed intranasally, neither the IgE and IgG antibody responses

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    • Downregulation of IgE antibody and allergic responses in the lung by epidermal biolistic microparticle delivery

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      Citation Excerpt :

      This is clearly different to the gene-gun DNA vaccination of Ludwig-Portugall et al,13 which induced TH1 immunity. It has been shown that a tolerizing procedure that inadvertently induced delayed hypersensitivity severely exacerbated lung inflammatory responses to allergen, and therefore downregulation instead of vaccination can be an advantage.34 The biolistic injections also markedly affected the lung response induced when the sensitized and boosted mice were challenged with aerosols of OVA.

    Supported by a grant from the Australian National Health and Medical Research Council.

    ☆☆

    Reprint requests: Wayne R. Thomas, PhD, TVW Telethon Institute for Child Health Research, PO Box 855, West Perth, Western Australia 6872, Australia.

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