CYTOKINES, FIBRINOLYSIS AND VASCULITIS

Endothelial cells are critical elements in the evolution of all types of cutaneous inflammation. They participate the pathological process t hrough the synthesis and secretion of pro-inflammatory cytokines, incl uding interleukin 1 (IL1), IL6, IL8, and the three colony stimulating factors G-CSF, M-CSF, and GM-CSF and the two chemotactic factors gro-a lpha and MCP. They also express a series of cell-surface proteins and glycoproteins known as cell adhesion molecules that allow circulating leukocytes to selectively bind to endothelial cells. In this paper we discuss the role of endothelial cells in the evolution of cutaneous ne crotizing vasculitis, an immunologically mediated clinical disorder as sociated with segmental inflammation and fibrinoid necrosis of the der mal venules, through the release of cytokines or their response to cyt okines locally produced from leukocytes themselves primarily involved in the endothelial cells injury. This interaction seems to involve and modulate other biologically active systems including the fibrinolytic system that can act amplifyng and self-perpetuating the tissue damage through a non-immunologic mechanism.