Abstract
Liver regeneration has been studied intensively, and it has been revealed that the major enzymes that degrade the extracellular matrix (ECM) are matrix metal-loproteinases and fibrinolytic enzymes. This proteolytic activity regulates ECM assembly, editing of excess ECM components, remodeling of the ECM structure, and release of growth factors and cytokines during the liver regeneration process. The fibrinolytic factors act in the liver regeneration process in the following two ways: activation of growth factors and degradation of ECM components. Studies on these points have been drastically advanced by the use of genetic all-deficient mice. Plasminogen (Plg) and urokinase-type plasminogen activator (u-PA) are bound to hepatocytes from mouse liver. Binding of Plg to hepatocytes impairs the inhibitory effect of α2-antiplasmin (α2-AP); that is, activation of Plg by Plg activator (PA) in the presence of hepatocytes is more enhanced than in the absence of hepatocytes. u-PA activates hepato cyte growth factor (HGF) and induces the proliferation of hepatocytes. Because Plg cleared ECM in mouse models, the loss of Plg showed a delay in liver regeneration. Thus, fibrinolytic factors are thought to act in two ways in the process of healing and regeneration after liver injury. The u-PA/PA inhibitor type-1 (PAI-1) system regulates the proliferation of hepatocytes by controlling HGF activation. The plasmin/α2-AP system regulates the microenvironment of liver regeneration by controlling ECM degradation. It is anticipated that in the future the regulation of proteases, which involve mainly fibrinolytic factors, will be a form of regenerative medicine for the liver.
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Okada, K., Ueshima, S., Matsuo, O. (2008). Role of Fibrinolysis in Hepatic Regeneration. In: Tanaka, K., Davie, E.W., Ikeda, Y., Iwanaga, S., Saito, H., Sueishi, K. (eds) Recent Advances in Thrombosis and Hemostasis 2008. Springer, Tokyo. https://doi.org/10.1007/978-4-431-78847-8_24
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DOI: https://doi.org/10.1007/978-4-431-78847-8_24
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