Regulatory NK cells suppress antigen-specific T cell responses

The Journal of Immunology : Official Journal of the American Association of Immunologists
Gunnur DenizM Akdis

Abstract

The immune system has a variety of regulatory/suppressive processes, which are decisive for the development of a healthy or an allergic immune response to allergens. NK1 and NK2 subsets have been demonstrated to display counterregulatory and provocative roles in immune responses, similar to Th1 and Th2 cells. T regulatory cells suppressing both Th1 and Th2 responses have been the focus of intensive research during the last decade. In this study, we aimed to investigate regulatory NK cells in humans, by characterization of NK cell subsets according to their IL-10 secretion property. Freshly purified IL-10-secreting NK cells expressed up to 40-fold increase in IL-10, but not in the FoxP3 and TGF-beta mRNAs. PHA and IL-2 stimulation as well as vitamin D3/dexamethasone and anti-CD2/CD16 mAbs are demonstrated to induce IL-10 expression in NK cells. The effect of IL-10+ NK cells on Ag-specific T cell proliferation has been examined in bee venom major allergen, phospholipase A2- and purified protein derivative of Mycobecterium bovis-induced T cell proliferation. IL-10+ NK cells significantly suppressed both allergen/Ag-induced T cell proliferation and secretion of IL-13 and IFN-gamma, particularly due to secreted IL-10 as demonstrated...Continue Reading

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