Artículos de revistas
Corticosteroids Inhibit Il-12 Production In Human Monocytes And Enhance Their Capacity To Induce Il-4 Synthesis In Cd4+ Lymphocytes
Registro en:
Journal Of Immunology. , v. 158, n. 12, p. 5589 - 5595, 1997.
221767
2-s2.0-0031570475
Autor
Blotta M.H.
DeKruyff R.H.
Umetsu D.T.
Institución
Resumen
We examined the effects of corticosteroids on IL-12 production by human monocytes and on cytokine synthesis in T cells. To distinguish the effects of corticosteroids on the APC used to activate the T cell from direct effects of corticosteroids on the T cell, experiments were performed by exposing the APC and not the T cell to corticosteroids. We found that corticosteroids significantly inhibited the production in monocytes of IL-12, a cytokine that is extremely potent in enhancing IFN-γ and inhibiting IL-4 synthesis in T cells. We demonstrated that reduced production of IL-12 in corticosteroid-treated monocytes resulted in a decreased capacity of the monocytes to induce IFN-γ and an increased ability to induce IL-4 in T cells. These results suggest that although corticosteroids may be beneficial for the treatment of asthma or allergic disease due to direct inhibitory effects of corticosteroids on cytokine synthesis in T cells, chronic corticosteroid therapy may indirectly exacerbate the long-term course of allergic disease. This deleterious effect of corticosteroids would result from a limitation in IL-12 production in tissue monocytes and macrophages, which would enhance production of Th2 cytokines (which augment allergic disease), and would reduce production of Th1 cytokines (which attenuate allergic disease) in T cells that subsequently infiltrate the tissues. 158 12 5589 5595 Goulding, N.J., Guyre, P.M., Glucocorticoids, lipocortins and the immune response (1993) Curr. Opin. Immunol., 5, p. 108 Gillis, S., Crabtree, G.R., Smith, K.A., Glucocorticoid-induced inhibition of T cell growth factor production. I. The effect on mitogen-induced lymphocyte proliferation (1979) J. 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