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Antigen presenting cell-independent cytokine and spontaneous in vitro IgE production in patients with atopic dermatitis: increased interferon-gamma production and lack of effects of in vivo low-dose interferon-gamma treatment



Antigen presenting cell-independent cytokine and spontaneous in vitro IgE production in patients with atopic dermatitis: increased interferon-gamma production and lack of effects of in vivo low-dose interferon-gamma treatment



Journal of Allergy and Clinical Immunology 96(1): 84-91



Atopic dermatitis is characterized by elevated serum IgE concentrations and dysregulation of T-lymphocyte function. To examine the pattern of cytokine production associated with elevated IgE levels, phorbol ester plus ionomycin-stimulated production of interleukin (IL)-4, IL-5, and interferon-gamma (IFN-gamma) by blood mononuclear cells from 16 patients with atopic dermatitis was compared with that of 18 healthy subjects. Spontaneous in vitro IgE production was also studied longitudinally in patients receiving placebo or daily treatment with 0.05 mg/m-2 IFN-gamma. Spontaneous in vitro IgE production and mitogen-driven IL-4 and IFN-gamma synthesis did not differ when patients were receiving interferon treatment compared with no treatment. Furthermore, ionomycin plus phorbol ester-stimulated mononuclear cells from patients with atopic dermatitis produced less IL-4 and more IFN-gamma than did cells from healthy subjects. IL-5 production by cells from patients with atopic dermatitis did not differ from that of cells from healthy subjects. The ratio of IL-4 to IFN-gamma produced in vitro was significantly lower (p = 0.04) in the cells of patients with atopic dermatitis (0.9) as compared with those of healthy subjects (2.7). The findings suggest that when circulating T cells are stimulated under antigen presenting cell-independent conditions, atopic dermatitis is not characterized by the shift in the reciprocal relationship between IL-4 and IFN-gamma production which has been postulated to explain the pathogenesis of IgE elevation and the therapeutic action of IFN-gamma in patients with atopic dermatitis.

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Accession: 008172202

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PMID: 7622767


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