Regulation of inflammatory responses by natural anticoagulants

Immunological Reviews
K Okajima

Abstract

Proinflammatory cytokines such as tumor necrosis factor-alpha (TNF-alpha) are critically involved in activation of the coagulation system in sepsis, leading to disseminated intravascular coagulation (DIC). Natural anticoagulants such as antithrombin (AT) and activated protein C (APC) regulate the coagulation system by inhibiting thrombin generation. In addition to these anticoagulant effects, both AT and APC have been shown to attenuate inflammatory responses induced by various noxious stimuli in rats such as lipopolysaccharide (LPS) challenge. AT promotes the endothelial release of prostacyclin, a potent anti-inflammatory prostaglandin that inhibits the monocytic production of TNF-alpha, by interacting with cell-surface heparin-like substances. APC directly inhibits the production of TNF-alpha by inhibiting the activation of both nudear factor kappaB (NFkappaB) and activator protein-1 in monocytes stimulated with LPS. Thrombomodulin, an endothelial membranous integral protein that binds thrombin, exerts anti-inflammatory effects by generating APC. Furthermore, tissue factor pathway inhibitor, a natural anticoagulant for the extrinsic pathway of the coagulation system, also attenuates LPS-induced inflammatory responses in rats ...Continue Reading

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