Interleukin 1 beta (IL1 beta) is a proinflammatory cytokine belonging to IL1 family. There are two known forms of IL1, IL1 alpha (predominant form in mice) and IL1 beta (predominant form in humans). IL1 beta and alpha are both synthesized as precursor. The IL1 beta precursor form is not biologically active, while IL1 alpha is. Expressed mainly by stimulated macrophages and monocytes, IL1 beta precursor is cleaved by Caspase 1/ICE and other proteases (2-3). Activated IL1 alpha remains mostly in the cytosol, activated IL1 beta is widely secreted. IL1 beta is known to be a mediator in inflammatory response and to be involved in a variety of cellular activities, proliferation, differentiation and apoptosis. It has been recently found that IL1 beta is a major cause of severe inflammation in the mouse model of Crohn's disease which makes IL1 beta an important target for this disease (4).
Cytokine-cytokine receptor interaction
Hematopoietic cell lineage
MAPK signaling pathway
Toll-like receptor signaling pathway
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