Omeprazole Inhibits IgE-mediated Mast Cell Activation and Allergic Inflammation Induced by Ingested Allergen in Mice

Overview

Journal J Allergy Clin Immunol

Specialty Allergy & Immunology

Date 2020 Mar 21

PMID 32194041

Citations 7

Authors

Cynthia Kanagaratham

Yasmeen S El Ansari

Benjamin F Sallis

Brianna-Marie A Hollister

Owen L Lewis

Samantha C Minnicozzi

Michiko K Oyoshi

Rachel Rosen

Samuel Nurko

Edda Fiebiger

Hans C Oettgen

Affiliations

Soon will be listed here.

Abstract

Background: Patients with eosinophilic esophagitis have increased numbers of mucosal mast cells. Administration of the proton pump inhibitor omeprazole can reduce both esophageal mast cell and eosinophil numbers and attenuate type 2 inflammation in these subjects.

Objective: Given that maintenance of an acidic environment within granules is important for mast cell homeostasis, we sought to evaluate the effects of omeprazole on mast cell functions including development, IgE:FcεRI-mediated activation, and responses to food allergen.

Methods: Mast cell degranulation, cytokine secretion, and early signaling events in the FcεRI pathway, including protein kinase phosphorylation and Ca flux, were measured after IgE crosslinking in murine bone marrow-derived mast cells and human cord blood-derived mast cells. The effects of omeprazole on these responses were investigated as was its impact on mast cell-dependent anaphylaxis and food allergy phenotypes in vivo.

Results: Murine and human mast cells treated with omeprazole exhibited diminished degranulation and release of cytokines and histamine in response to allergen. In murine mast cells, phosphorylation of protein kinases, ERK and SYK, was decreased. Differentiation of mast cells from bone marrow progenitors was also inhibited. IgE-mediated passive anaphylaxis was blunted in mice treated with omeprazole as was allergen-induced mast cell expansion and mast cell activation in the intestine in a model of food allergy.

Conclusions: Our findings suggest that omeprazole targets pathways important for the differentiation and activation of murine mast cells and for the manifestations of food allergy and anaphylaxis.

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