factor X
Definition
- Noun:
- A coagulation factor in blood plasma: Factor X is a specific protein (specifically, a zymogen) that plays a crucial role in the middle phase of the blood coagulation cascade. It is activated to form the enzyme factor Xa.
- An enzyme precursor in the clotting process: It is converted to its active form, factor Xa, which then converts prothrombin to thrombin, a key step in forming a blood clot.
Usage Examples
- Noun:
- A deficiency in factor X can lead to a rare bleeding disorder.
- The drug works by inhibiting the activity of activated factor X (factor Xa).
- Factor X is synthesized in the liver and requires vitamin K for its production.
Advanced Usage
"Activated factor X (factor Xa)": This is the active enzyme form of factor X, which directly cleaves prothrombin.
- Direct oral anticoagulants often target factor Xa to prevent thrombosis.
"Factor X deficiency": A medical term for a hereditary bleeding disorder caused by insufficient or dysfunctional factor X.
- Patients with factor X deficiency may experience symptoms ranging from mild to severe.
Variants and Related Words
- Stuart-Prower factor: An alternative name for factor X, named after the first two patients diagnosed with its deficiency.
- Coagulation factor: The general category to which factor X belongs. Other examples include factor VIII and factor IX.
- Prothrombinase complex: The enzymatic complex (composed of factor Xa, factor Va, calcium ions, and a phospholipid surface) that converts prothrombin to thrombin.
Synonyms
- Coagulation factor X: The full technical term.
- Stuart factor: A common synonym in medical literature.
Related Phrases
- "Extrinsic pathway": One of the two initial pathways that lead to the activation of factor X.
- "Intrinsic pathway": The other initial pathway that converges to activate factor X.
- "Common pathway": The final coagulation pathway that begins with the activation of factor X.
Notes
- Factor X is a vitamin K-dependent clotting factor.
- Its position at the start of the common pathway makes it a critical control point in coagulation, and thus a major target for anticoagulant therapies.
Noun
-
coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors
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