The mechanism by which hirudin acts on thrombin
Hirudin is the most prominent and extensively studied active component among the various bioactive substances extracted from leeches and their salivary glands. It is a small-molecule polypeptide composed of 65 to 66 amino acids. Leeches are rich in hirudin, which exhibits an exceptionally potent inhibitory effect on thrombin—making it the strongest naturally occurring, thrombin-specific inhibitor discovered to date. Hirudin possesses remarkable anticoagulant and antithrombotic activities, holding great promise for clinical applications in the treatment and prevention of various types of thrombosis.
Hirudin is the most prominent and extensively studied active component among the various bioactive substances extracted from leeches and their salivary glands. It is a small-molecule polypeptide composed of 65 to 66 amino acids. Leeches are rich in hirudin, which exhibits an exceptionally potent inhibitory effect on thrombin—making it the strongest naturally occurring, thrombin-specific inhibitor discovered to date. Hirudin possesses remarkable anticoagulant and antithrombotic activities, holding great promise for clinical applications in the treatment and prevention of various types of thrombosis.
A series of enzyme-catalyzed cascade amplification reactions activates prothrombin into thrombin during both intrinsic and extrinsic coagulation pathways. Thrombin is a serine protease that plays a critically important role in the process of thrombus formation, including the cascade reactions of blood coagulation, fibrin deposition, and platelet activation. Anticoagulant inhibitors can be classified into indirect thrombin inhibitors and direct thrombin inhibitors. The former exert their anticoagulant effects by catalyzing the natural inhibitors of thrombin (such as ATIII or heparin cofactor II). Hirudin, on the other hand, is a specific thrombin inhibitor that binds directly to thrombin; its anticoagulant action does not rely on ATIII or heparin cofactor II and thus belongs to the category of direct thrombin inhibitors. Hirudin exerts its anticoagulant effect by binding to two distinct sites on thrombin: the non-active substrate recognition site and the enzyme's active center. It forms an irreversible complex with thrombin in a 1:1 ratio, thereby completely inactivating the enzyme. Not only is hirudin highly specific in its anticoagulant action, but its anticoagulant activity is also significantly stronger than that of heparin. Moreover, hirudin can inhibit not only free thrombin circulating in plasma, but also thrombin bound to other proteins or cells.
Relevant Information
“Feini Zhi” is the brand trademark of Feiniu Leech Freeze-Dried Powder (Traditional Chinese Medicine Herbal Slices), a product under Huazhi Pharmaceutical (Yunnan) Co., Ltd. This brand specializes in the development and application of medicinal leech products, and represents a comprehensive pharmaceutical brand integrating superior leech breed breeding, modern aquaculture, scientific research and innovation, sophisticated product processing, pharmaceutical manufacturing, and marketing. Its flagship product—Feiniu Leech Freeze-Dried Powder (Traditional Chinese Medicine Herbal Slices)—is a best-selling product nationwide.
View details2024/12/24
2024/11/22
2024/11/22
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