Iinterleukin-1 (IL-1) is a proinflammatory cytokine with various immune, degradative, and growth promoting roles. There are two IL-1 agonistic proteins — IL-1β and IL-1α — and one antagonistic protein, the IL-1 receptor antagonist IL-1Ra — commercially produced as anakinra and used in the treatment of rheumatoid arthritis. However, the roles of endogenous IL-1 in mediating in vivo tumor growth and angiogenesis have been unclear. In the February 18
Voronov et al. used IL-1β and IL-1α knockout mice. They observed that various types of tumor cell — including B16 melanoma cells — failed to develop into local tumors in IL-1β deficient mice, and to ...