Glucocorticoids inhibit human antigen‐specific and enhance total IgE and IgG4 production due to differential effects on T and B cells in vitro

Although anti‐inflammatory properties of glucocorticoids (GC) are well documented, their activity in allergic diseases is still controversial. Recently, it has been reported that GC can increase, both in vivo and in vitro, the polyclonal production of total IgE. In this study we investigated the effects of GC on the antigen (Ag)‐specific IgE response in a human in vitro system with peripheral blood mononuclear cells or B cells of bee venom‐sensitized individuals that allows the production of bee venom phospholipase A2 (PLA)‐specific IgE and IgG4 antibodies (Ab). PLA‐specific Ab were induced by simultaneously activating T cells and B cells specifically with allergen and polyclonally with anti‐CD2 and soluble CD40 ligand (sCD40L) in the presence of interleukin (IL)‐4. Indeed, dexamethasone and prednisolone enhanced the formation of total IgE and IgG4 in PBMC, while the production of PLA‐specific IgE and IgG4 Ab was selectively inhibited in a dose‐dependent manner. The suppressive effect of GC was mediated during Ag‐specific stimulation and T cell‐B cell interaction. This was due to GC suppressing specific T cell proliferation and cytokine production, whereas neither allergen‐specific nor total IgE and IgG4 production by sCD40L/IL‐4‐stimulated pure B cells was affected. In contrast to GC, cyclosporine A inhibited both total and PLA‐specific IgE and IgG4 secretion in peripheral blood mononuclear cells and B cell cultures. Further experiments showed that increase in nonspecific total isotype response resulted from inhibition of IL‐4 uptake by cells other than B cells and sufficient availability of IL‐4 to B cells for isotype switch and synthesis. Furthermore, demonstration of opposite regulatory effects of GC on specific and total isotype formation in vitro, including the inhibition of allergy‐relevant Ag‐specific IgE response, may contribute to a better understanding of apparently controversial observations, and explain why most allergic patients benefit from GC therapy.

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