Role of IL-1-mediated inflammation in tumor angiogenesis.
Angiogenesis, or generation of new blood vessels from pre-existing vessels, is an integral part of many physiological or pathological processes, including tumor growth. Physiological angiogenesis is a complex process controlled by different proangiogenic as well as antiangiogenic factors. For angiogenic induction, the balance between these pro- and antiangiogenic factors in the microenvironment has to shift in favor of proangiogenic factors, either by upregulation of these pro-angiogenic factors or by downregulation of angiogenic inhibitors. Proinflammatory cytokines, such as IL-1 and TNFa, were found to be major proangiogenic stimuli of both physiological and pathological angiogenesis. The IL-1 family consists of pleiotropic proinflammatory and immunoregulatory cytokines, namely, IL-1alpha and IL-1beta, and one antagonistic protein, the IL-1 receptor antagonist (IL-1Ra), which binds to IL-1 receptors without transmitting an activation signal and represents a physiological inhibitor of preformed IL-1. Previously, we described an important role for microenvironment IL-1, mainly IL-1beta, in tumor angiogenesis. In this chapter, we analyze the role of microenvironment host- and tumor cell-derived IL-1 on angiogenesis and the role of inflammation in pathological angiogenesis.
Voronov
Elena
E
The Shraga Segal Department of Microbiology and Immunology, Faculty of Health Sciences and Cancer Research Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel. elena@bgu.ac.il
Carmi
Yaron
Y
Apte
Ron N
RN
D000818:Animals; D016207:Cytokines / Q000378:metabolism; D006801:Humans; D007249:Inflammation; D053590:Interleukin 1 Receptor Antagonist Protein / Q000378:metabolism; D007375:Interleukin-1 / Q000378:metabolism* / Q000502:physiology*; D051379:Mice; D009361:Neoplasm Invasiveness; D009369:Neoplasms / Q000276:immunology* / Q000378:metabolism; D009389:Neovascularization, Pathologic; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D016207:Cytokines; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha