Coagulation cascade proteases and tissue fibrosis.


:Fibrotic disorders of the liver, kidney and lung are associated with excessive deposition of extracellular matrix proteins and ongoing coagulation-cascade activity. In addition to their critical roles in blood coagulation, thrombin and the immediate upstream coagulation proteases, Factors Xa and VIIa, influence numerous cellular responses that may play critical roles in subsequent inflammatory and tissue repair processes in vascular and extravascular compartments. The cellular effects of these proteases are mediated via proteolytic activation of a novel family of cell-surface receptors, the protease-activated receptors (PAR-1, -2, -3 and -4). Although thrombin is capable of activating PAR-1, -3 and -4, there is accumulating in vitro evidence that the profibrotic effects of thrombin are predominantly mediated via PAR-1. Factor Xa is capable of activating PAR-1 and PAR-2, but its mitogenic effects for fibroblasts are similarly mediated via PAR-1. These proteases do not exert their profibrotic effects directly, but act via the induction of potent fibrogenic mediators, such as platelet-derived growth factor and connective tissue growth factor. In vivo studies using proteolytic inhibitors, PAR-1 antagonists and PAR-1-deficient mice have provided evidence that coagulation proteases play a key role in tissue inflammation and in a number of vascular pathologies associated with hyperproliferation of smooth muscle cells. More recently, coagulation proteases have also been shown to play a role in the pathogenesis of fibrosis but the relative contribution of their cellular versus their procoagulant effects awaits urgent evaluation in vivo. These studies will be informative in determining the potential application of PAR-1 antagonists as antifibrotic agents.


Biochem Soc Trans


Chambers RC,Laurent GJ





Has Abstract


2002-04-01 00:00:00












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