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NCI: Interleukin-1 (IL-1) is a pro-inflammatory cytokine that signals primarily through the type 1 IL-1 receptor (IL-1R1). The activities of IL-1 include induction of fever, expression of vascular adhesion molecules, and roles in arthritis and septic shock. The inflammatory activities of IL-1 are partially derived by transcriptionally inducing expression of cytokines such as TNF-alpha and interferons, as well as inducing the expression of other inflammation-related genes. There are two forms of IL-1 encoded by distinct genes, IL-1 alpha and IL-1 beta. IL-1 beta is produced as a 269 amino acid precursor that is cleaved by IL-1beta converting enzyme (ICE) to the active IL-1 beta form that is secreted. IL-1 signaling is opposed by the naturally occurring peptide IL-1 receptor antagonist which is a therapeutic agent for the treatment of arthritis. The type 1 IL-1 receptor protein binds IL-1 beta but requires the IL-1 receptor accessory protein (IL-1RAcP) to transduce a signal. IL-1 binding causes activation of tw
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