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Allergy. 2019 Mar 4. doi: 10.1111/all.13759. [Epub ahead of print]

IL-4 receptor α blockade prevents sensitization and alters acute and long-lasting effects of allergen-specific immunotherapy of murine allergic asthma.

Author information

1
Center of Allergy and Environment (ZAUM), Technical University of Munich and Helmholtz Center Munich, Member of the German Center of Lung Research (DZL), Munich, Germany.
2
German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Center Munich, Neuherberg, Germany.
3
Department of Otolaryngology, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.
4
Chair of Experimental Genetics, School of Life Science Weihenstephan, Technical University of Munich, Freising, Germany.
5
German Center for Diabetes Research (DZD), Neuherberg, Germany.
6
Luxembourg Institute of Health (LIH), Esch-sur-Alzette, Luxembourg.
7
Department of Dermatology and Allergy Center, Odense Research Center for Anaphylaxis, University of Southern Denmark, Odense, Denmark.

Abstract

BACKGROUND:

Allergen-specific immunotherapy (AIT) is the only causal treatment for allergy. However, success rates vary depending on the type of allergy and disease background of the patient. Hence, strategies targeting an increased therapeutic efficacy are urgently needed. Here, the effects of blockade of IL-4 and IL-13 signaling on different phases of AIT were addressed.

METHODS:

The impact of the recombinantly produced IL-4 and IL-13 antagonist IL-4 Mutein (IL-4M) on allergic sensitization and AIT outcome in experimental allergic asthma were analyzed in a murine model. The effects of IL-4M administration were assessed prior/during sensitization, immediately after AIT under allergen challenge, and two weeks post treatment.

RESULTS:

Intervention with IL-4M prior/during sensitization led to strong induction of IgG1, IgG2a, IgG2b and IgG3, decrease of specific and total IgE as well as of IL-5 in serum. Similar effects on the serum immunoglobulin levels were observed immediately after IL4M-supplemented AIT during allergen challenge. Additionally, IL4M markedly suppressed type-2 cytokine secretion of splenocytes beyond the effect of AIT alone. These effects were equaled to those of AIT alone two weeks post treatment. Intriguingly, here, IL-4M induced a sustained decrease of Th2-biased Tregs (ST2+ FOXP3+ GATA3intermediate ).

CONCLUSIONS:

IL-4 and IL-13 blockade during experimental AIT demonstrates beneficial effects on immunological key parameters such as immunoglobulin and cytokine secretion immediately after AIT. Although two weeks later these effects were dropped to those of AIT alone, the number of potentially disease-triggering Th2-biased Tregs was further significantly decreased by IL-4M treatment. Hence, IL-4/IL13-targeting therapies prime the immune memory in therapy success-favoring manner. This article is protected by copyright. All rights reserved.

KEYWORDS:

Allergic asthma; IL-4-receptor-α; Th2-like regulatory T cells; allergen-specific immunotherapy; cytokine antagonist

PMID:
30829405
DOI:
10.1111/all.13759

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