Omalizumab-induced reductions in mast cell Fce psilon RI expression and function

The Journal of Allergy and Clinical Immunology
Lisa A BeckSarbjit Saini

Abstract

By design, omalizumab binds free IgE in the circulation and prevents its attachment to the surface of mast cells and basophils, thereby preventing them from responding to allergens. Previously, omalizumab rapidly reduced free IgE levels, as well as basophil high-affinity IgE receptors, leading to significant reductions in basophil mediator response to allergen. It is assumed that tissue mast cells are similarly altered in their Fc epsilon RI density and function. We examined the phenotypic shift of skin mast cells in parallel to that of blood basophils in 3 subjects infused with omalizumab. Three subjects with allergic rhinitis underwent intradermal skin test titration with house dust mite antigen at days 0, 7, 70, and 196 of omalizumab treatment. As control subjects, 5 untreated subjects with allergic rhinitis were evaluated at similar time points. All subjects underwent skin biopsy 18 to 24 hours later at the site of allergen injection. Biopsy specimens were characterized by means of immunohistochemisty for tryptase and Fc epsilon RI alpha immunoreactivity, as well other markers (CD3, CD45RO, CD68, cutaneous lymphocyte antigen, and major basic protein). Omalizumab recipients, but not control subjects, demonstrated reductions ...Continue Reading

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