Journal
EBIOMEDICINE
Volume 7, Issue -, Pages 230-239Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ebiom.2016.03.028
Keywords
Allergy prophylaxis; Cell-based therapy; B-cell tolerance; T-cell tolerance; Allergen-specific tolerance induction
Funding
- Austrian Science Fund (FWF) [P 23350] Funding Source: researchfish
- Austrian Science Fund (FWF) [W1248, W1212] Funding Source: Austrian Science Fund (FWF)
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Background: Therapeutic strategies for the prophylaxis of IgE-mediated allergy remain an unmet medical need. Cell therapy is an emerging approach with high potential for preventing and treating immunological diseases. We aimed to develop a cell-based therapy inducing permanent allergen-specific immunological tolerance for preventing IgE-mediated allergy. Methods: Wild-type mice were treated with allergen-expressing bone marrow cells under a short course of tolerogenic immunosuppression (mTOR inhibition and costimulation blockade). Bone marrow was retrieved from a novel transgenic mouse ubiquitously expressing the major grass pollen allergen Phl p 5 as a membrane-anchored protein (BALB/c-Tg[Ph1p5-GFP], here mPhl p 5). After transplantation recipients were lgE-sensitized at multiple time points with Phl p 5 and control allergen. Results: Mice treated with mPhl p 5 bone marrow did not develop Phl p 5-specific IgE (or other isotypes) despite repeated administration of the allergen, while mounting and maintaining a strong humoral response towards the control allergen. Notably, Phl p 5-specific T cell responses and allergic airway inflammation were also completely prevented. interestingly allergen-specific B cell tolerance was maintained independent of Treg functions indicating deletional tolerance as underlying mechanism. Conclusion: This proof-of-concept study demonstrates that allergen-specific immunological tolerance preventing occurrence of allergy can be established through a cell-based therapy employing allergen-expressing leukocytes. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.orgilicenses/by-nc-nd/4.0/).
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