Abstract
Blood coagulation is a complex chain reaction of enzyme activations in which inactive zymogens are activated by proteolytic cleavage. Each newly activated enzyme in turn cleaves the next zymogen in the chain, resulting in its activation. The final enzyme in the cascade, thrombin, then cleaves soluble fibrinogen into insoluble fibrin which forms a thrombus. A single enzyme can cleave and activate multiple zymogens, thus a small initial stimulus can amplify into a massive wave of coagulation. In addition, thrombin can feedback and stimulate its own synthesis by proteolytically activating two necessary cofactors in thrombin generation, Factor Va and Factor VIIIa. Thus, the coagulation cascade proceeds by both amplification and a feedback positive mechanism, a potentially deadly combination if not closely regulated.
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Cooper, S.T., Church, F.C. (1997). PCI: Protein C Inhibitor?. In: Church, F.C., Cunningham, D.D., Ginsburg, D., Hoffman, M., Stone, S.R., Tollefsen, D.M. (eds) Chemistry and Biology of Serpins. Advances in Experimental Medicine and Biology, vol 425. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5391-5_5
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