Decreases in human dendritic cell-dependent TH2-like responses after acute in vivo IgE neutralization

John T. Schroeder, Anja P. Bieneman, Kristin L. Chichester, Robert G. Hamilton, Hui Qing Xiao, Sarbjit S. Saini, Mark C. Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Dendritic cells (DCs) and other professional antigen-presenting cells express a variant of the high-affinity IgE receptor known as αγ2, which, on the basis of in vitro findings, has long been implicated to function in facilitating allergen uptake and presentation to TH cells. Objectives: To use omalizumab as an in vivo tool to neutralize IgE binding to circulating dendritic cells and to assess whether this results in altered DC-dependent T-cell responsiveness to allergen ex vivo. Methods: Subjects with cat allergy were enrolled in a 3.5-month, double blind, randomized (3.5:1), placebo-controlled trial of omalizumab using standard dosing for allergic asthma. Blood plasmacytoid and myeloid DCs were assessed at baseline and posttreatment for expression of surface IgE, Fcε{lunate}RIα, and induction of CD4+T-cell proliferation and cytokine responses to cat allergen. Results: IgE expression on plasmacytoid and myeloid DCs from omalizumab-treated subjects (n = 12) decreased by ≥95% posttreatment (P = .0005), whereas Fcε{lunate}RIα expression decreased by 66% and 48%, respectively (P = .0005). Cat allergen-induced proliferation in DC/T-cell cocultures observed at baseline was suppressed ∼20% to 40% postomalizumab treatment (P = .001). Multiplexing for cytokines in plasmacytoid DC/T-cell cocultures also showed decreases in IL-5, IL-13, and IL-10 (P < .05), whereas IL-2 and IFN-γ were unaltered or slightly increased. These changes were not evident in placebo-control subjects (n = 4). Conclusion: IgE likely facilitates allergen presentation by dendritic cells in vivo and is also important in regulating DC-dependent T-cell cytokines during effector phases of allergic disease.

Original languageEnglish (US)
Pages (from-to)896-901.e6
JournalJournal of Allergy and Clinical Immunology
Volume125
Issue number4
DOIs
StatePublished - Apr 2010

Keywords

  • Dendritic cells
  • IgE
  • antigen presentation
  • cytokine
  • receptor

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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