Stabilization of IFN-gamma mRNA by MAPK p38 in IL-12- and IL-18-stimulated human NK cells.

Blood
Athanasios MavropoulosA R Clark

Abstract

The rapid induction of interferon-gamma (IFN-gamma) by innate cytokines such as interleukin 12 (IL-12) and IL-18 is critical for immunity against infectious pathogens. We investigated the molecular mechanisms underlying this response. IL-12 and IL-18 rapidly and synergistically induced the secretion of IFN-gamma by freshly purified human peripheral blood lymphocytes. At early time points, IFN-gamma was expressed almost exclusively by natural killer cells and in both CD56bright and CD56dim subpopulations. Mitogen-activated protein kinase p38 was activated strongly by IL-18 and weakly by IL-12 in natural killer cells but was not activated by either cytokine in T cells. The expression of IFN-gamma mRNA and protein was dose-dependently blocked by SB203580, a specific inhibitor of mitogen-activated protein kinase p38, which also caused a dramatic destabilization of IFN-gamma mRNA. The 3' untranslated region (UTR) of IFN-gamma mRNA conferred p38 responsiveness to a heterologous reporter mRNA. Therefore, the synergistic induction of IFN-gamma by IL-12 and IL-18 in natural killer cells is mediated at least in part by p38-dependent and 3' UTR-mediated stabilization of IFN-gamma mRNA.

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