Blood Coagulation System & ExKits ELISA Kits

Blood coagulation, as an important physiological defense mechanism of the body, can convert blood into insoluble fibrin clots through a series of complex biological reactions when the integrity of blood vessels is damaged or tissues are injured, thereby achieving hemostasis and creating conditions for wound healing. This process is not a single reaction, but a cascade reaction process involving the orderly participation and layer-by-layer activation of multiple coagulation factors — after blood vessel damage, platelets quickly adhere to the injury site and release related active substances to trigger vasoconstriction and platelet aggregation, forming a preliminary thrombus; at the same time, tissue factor released by the damaged tissue initiates the activation process of prothrombin, promoting the conversion of prothrombin to thrombin, which in turn catalyzes the generation of fibrin from fibrinogen. The network formed by fibrin interweaving further stabilizes the platelet thrombus, and finally completes the formation of blood clots. If coagulation function is disturbed, it may lead to two extreme situations: either insufficient coagulation causing spontaneous bleeding, or excessive coagulation forming abnormal thrombi, endangering the health of the body. To maintain the dynamic balance between coagulation and anticoagulation, there is a complete anticoagulant system in the body. Anticoagulant proteins, plasmin-like substances and platelet inhibitors work together to ensure the normal circulation of blood in blood vessels and avoid the occurrence of abnormal coagulation events.

Under normal physiological conditions, the coagulation and anticoagulation systems are in a precise dynamic balance. This balance can not only ensure that the body quickly starts the hemostatic mechanism when injured, but also effectively prevent excessive thrombus formation from blocking blood vessels, providing an important guarantee for the normal operation of the blood system.

As a brand focusing on the research and development of scientific research detection tools, ExKits focuses on the field of coagulation function regulation, and relies on advanced technology to create high-precision and high-sensitivity ELISA kits, which can efficiently detect a variety of sample indicators related to blood coagulation. This series of kits can provide reliable experimental support for researchers to deeply explore the molecular regulatory mechanism of the coagulation process and reveal the association between abnormal coagulation function and the occurrence and development of diseases, helping researchers achieve more breakthrough results in the field of coagulation and vascular disease research.

1. Coagulation Factors

Coagulation factors are proteins directly involved in the process of blood coagulation. The World Health Organization (WHO) has numbered them according to the order of their discovery (such as Factor I, II, III, etc.). Various coagulation factors interact to form a complex cascade reaction network, namely the coagulation cascade. When a coagulation factor is activated, the letter "a" is added after its corresponding Roman numeral (e.g., Factor VII becomes Factor VIIa when activated). It should be noted that Factor XIII, which was discovered later, has no decisive effect on coagulation function, while Factor VI has been revoked because it was confirmed to be the activated form of Factor V.

Note: HMWK = High molecular weight kininogen; vWf = Von Willebrand factor; TF = Tissue factor

2. Coagulation Pathway

The coagulation process is regulated by a variety of coagulation factors. The WHO has numbered the protein coagulation factors directly involved in coagulation from I to XIII according to the order of their discovery. These factors interact to form a complex prothrombin activation cascade reaction network.

The coagulation process is mainly divided into two ways: the intrinsic pathway and the extrinsic pathway. Both eventually converge to the same coagulation endpoint to complete thrombus formation. Their interaction and precise regulation ensure that the body can form thrombus in time when bleeding, prevent excessive bleeding and promote wound healing.

● Intrinsic Pathway

This pathway is mainly activated when the inner wall of blood vessels is damaged. Platelets in the blood, substances released from the blood vessel wall come into contact with related components in the blood, triggering the coagulation process. It is specifically divided into three steps:

1. Contact activation: After blood vessel damage, coagulation factors come into contact with damaged vascular endothelial cells and Tissue Factor (TF) and are activated;
2. Cascade activation of coagulation factors: A series of coagulation factors, including Factor XII, Factor XI, Factor IX, etc., are activated in turn and interact with each other, ultimately converting Factor X into activated thrombin IIa;
3. Thrombin formation: Activated thrombin promotes the conversion of fibrinogen to fibrin, forming a thrombus network.

● Extrinsic Pathway

This pathway is initiated by the release of tissue factor from injured tissue. The main feature of the extrinsic coagulation pathway is that its activation speed is much faster than that of the intrinsic coagulation pathway, and it is the key pathway for the body to quickly start hemostasis. The specific steps are as follows:

1. Tissue factor release: Damaged tissue releases tissue factor;
2. Complex formation and factor activation: Tissue factor forms a complex with Factor VII in plasma to activate Factor VII;
3. Factor X activation: Activated Factor VII further activates Factor X to form active thrombin;
4. Thrombin formation: Active thrombin promotes the conversion of fibrinogen to fibrin, forming a thrombus network.

3. Anticoagulation Mechanism

The anticoagulant mechanism in the body can antagonize thrombus formation, maintain normal blood circulation, and prevent the generation and expansion of abnormal thrombi. It is mainly realized through four major systems:

1. Anticoagulant effect of blood vessel wall: Vascular wall cells and platelets release a variety of cytokines, such as Nitric Oxide (NO) and Prostaglandin (PGI2), which can inhibit platelet adhesion and aggregation, thereby blocking the initial link of thrombus formation;
2. Anticoagulant enzyme system: Anticoagulase is a kind of protein that can inhibit thrombin activity, including antithrombin, Protein C, Protein S, etc. They can inhibit the production of thrombin in the coagulation cascade, thereby reducing the risk of thrombus formation;
3. Plasmin system: This system is the core mechanism for dissolving thrombi, which can prevent thrombi from forming and expanding in blood vessels. It mainly includes plasminogen, plasmin and plasmin inhibitors (such as Plasminogen Activator Inhibitor-1, PAI-1) and other components;
4. Anticoagulant proteins in plasma: The plasma also contains some anticoagulant proteins, such as Antithrombin III and Tissue Factor Pathway Inhibitor, which can directly inhibit thrombin activity, precisely regulate the coagulation process, and avoid excessive coagulation in the body.

4. Product Information of ExKits Blood Coagulation-related ELISA Kits