Chemicals and Drugs

Factor VIIIa

Activated form of factor VIII. The B-domain of factor VIII is proteolytically cleaved by thrombin to form factor VIIIa. Factor VIIIa exists as a non-covalent dimer in a metal-linked (probably calcium) complex and functions as a cofactor in the enzymatic activation of factor X by factor IXa. Factor VIIIa is similar in structure and generation to factor Va.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Activated form of factor VIII. The B-domain of factor VIII is proteolytically cleaved by thrombin to form factor VIIIa. Factor VIIIa exists as a non-covalent dimer in a metal-linked (probably calcium) complex and functions as a cofactor in the enzymatic activation of factor X by factor IXa. Factor VIIIa is similar in structure and generation to factor Va.

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Classification

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Synonyms

13 entry terms
  • Blood Coagulation Factor VIII, Activated
  • Coagulation Factor VIIIa
  • Factor 8A
  • Factor Eight A
  • Factor VIII, Activated
  • Factor VIII, Thrombin-Activated
  • Activated Factor VIII
  • Factor VIII, Thrombin Activated
  • Factor VIIIa, Coagulation
  • Thrombin-Activated Factor VIII
  • Factor VIIIa Heavy Chain, 200 kDa Isoform
  • Factor VIIIa Heavy Chain, 92 kDa Isoform
  • Factor VIIIa Light Chain

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Aspects Covered

28 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, agonists, analysis, antagonists & inhibitors, biosynthesis, cerebrospinal fluid, chemical synthesis, chemistry, classification, drug effects, economics, genetics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, ultrastructure, urine.

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History Note

90

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Previous Indexing

  • Factor VIII (1981-1989)

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References

  1. National Library of Medicine. Factor VIIIa. Medical Subject Headings (MeSH). 2026. Unique ID D015944. http://id.nlm.nih.gov/mesh/2026/D015944
  2. Factor VIIIa. In: Wikidata. https://www.wikidata.org/wiki/Q50259302