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Journal Article
Research Support, Non-U.S. Gov't
Inhibition of monocyte-derived inflammatory cytokines by IL-25 occurs via p38 Map kinase-dependent induction of Socs-3.
Blood 2009 April 10
IL-25, a member of the IL-17 cytokine family, is known to enhance Th2-like responses associated with increased serum levels of IgE, IgG1, IgA, blood eosinophilia, and eosinophilic infiltrates in various tissues. However, IL-25 also abrogates inflammatory responses driven by Th17 cells. However, the cell types that respond to IL-25 and the mechanisms by which IL-25 differentially regulates immune reactions are not well explored. To identify potential targets of IL-25, we initially examined IL-25 receptor (IL-25R) in human peripheral blood cells. IL-25R was predominantly expressed by CD14(+) cells. We next assessed the functional role of IL-25 in modulating the response of CD14(+) cells to various inflammatory signals. CD14(+) cells responded to IL-25 by down-regulating the synthesis of inflammatory cytokines induced by toll-like receptor (TLR) ligands and inflammatory cytokines. Inhibition of cytokine response by IL-25 occurred via a p38 Map kinase-driven Socs-3-dependent mechanism. In vivo, IL-25 inhibited monocyte-derived cytokines and protected against LPS-induced lethal endotoxemia in mice. These data indicate that IL-25 is a negative regulator of monocyte proinflammatory cytokine responses, which may have therapeutic implications.
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