MeSH Browser

MeSH Heading: Factor XIIa
Tree Number(s): D08.811.277.656.300.760.324; D08.811.277.656.959.350.324; D12.776.124.125.450.324; D23.119.450.324
Unique ID: D015956
RDF Unique Identifier: http://id.nlm.nih.gov/mesh/D015956
Annotation: /defic = FACTOR XII DEFICIENCY
Scope Note: Activated form of factor XII. In the initial event in the intrinsic pathway of blood coagulation, kallikrein (with cofactor HIGH MOLECULAR WEIGHT KININOGEN) cleaves factor XII to XIIa. Factor XIIa is then further cleaved by kallikrein, plasmin, and trypsin to yield smaller factor XII fragments (Hageman-Factor fragments). These fragments increase the activity of prekallikrein to kallikrein but decrease the procoagulant activity of factor XII.
Entry Term(s): Activated Factor XII; Blood Coagulation Factor XII, Activated; Coagulation Factor XIIa; Factor 12A; Factor Twelve A; Factor XII, Activated; Hageman-Factor Fragments; Prekallikrein Activator
Previous Indexing: Factor XII (1966-1989); Peptide Fragments (1979-1987); Serine Proteinases (1988-1989)
See Also: Coagulants
Public MeSH Note: 90
History Note: 90
Date Established: 1990/01/01
Date of Entry: 1989/05/25
Revision Date: 2019/05/30

Allowable Qualifiers: administration & dosage (AD)

adverse effects (AE)

agonists (AG)

analysis (AN)

antagonists & inhibitors (AI)

biosynthesis (BI)

cerebrospinal fluid (CF)

chemical synthesis (CS)

chemistry (CH)

classification (CL)

drug effects (DE)

economics (EC)

genetics (GE)

history (HI)

immunology (IM)

isolation & purification (IP)

metabolism (ME)

pharmacokinetics (PK)

pharmacology (PD)

physiology (PH)

poisoning (PO)

radiation effects (RE)

standards (ST)

supply & distribution (SD)

therapeutic use (TU)

toxicity (TO)

ultrastructure (UL)

urine (UR)

Enzymes and Coenzymes [D08]
- Enzymes [D08.811]
  - Hydrolases [D08.811.277]
    - Peptide Hydrolases [D08.811.277.656]
      - Endopeptidases [D08.811.277.656.300]
        
        Serine Endopeptidases [D08.811.277.656.300.760]
        
        Acrosin [D08.811.277.656.300.760.030]
        
        Cathepsin G [D08.811.277.656.300.760.066]
        
        Chymases [D08.811.277.656.300.760.103]
        
        Chymotrypsin [D08.811.277.656.300.760.176]
        
        Complement Factor B [D08.811.277.656.300.760.198]
        
        Complement Factor D [D08.811.277.656.300.760.200]
        
        Complement Factor I [D08.811.277.656.300.760.210]
        
        Endopeptidase K [D08.811.277.656.300.760.247]
        
        Enteropeptidase [D08.811.277.656.300.760.284]
        
        Factor VIIa [D08.811.277.656.300.760.300]
        
        Factor IXa [D08.811.277.656.300.760.310]
        
        Factor Xa [D08.811.277.656.300.760.315]
        
        Factor XIa [D08.811.277.656.300.760.320]
        
        Factor XIIa [D08.811.277.656.300.760.324]
        
        Fibrinolysin [D08.811.277.656.300.760.330]
        
        Furin [D08.811.277.656.300.760.353]
        
        Granzymes [D08.811.277.656.300.760.397]
        
        High-Temperature Requirement A Serine Peptidase 1 [D08.811.277.656.300.760.420]
        
        High-Temperature Requirement A Serine Peptidase 2 [D08.811.277.656.300.760.431]
        
        Kallikreins [D08.811.277.656.300.760.442]
        
        Lactoferrin [D08.811.277.656.300.760.471]
        
        Mannose-Binding Protein-Associated Serine Proteases [D08.811.277.656.300.760.501]
        
        Myeloblastin [D08.811.277.656.300.760.530]
        
        Pancreatic Elastase [D08.811.277.656.300.760.560]
        
        Plasminogen Activators [D08.811.277.656.300.760.635]
        
        Prolyl Oligopeptidases [D08.811.277.656.300.760.637]
        
        Pronase [D08.811.277.656.300.760.638]
        
        Proprotein Convertase 1 [D08.811.277.656.300.760.640]
        
        Proprotein Convertase 2 [D08.811.277.656.300.760.646]
        
        Proprotein Convertase 5 [D08.811.277.656.300.760.648]
        
        Proprotein Convertase 9 [D08.811.277.656.300.760.718]
        
        Reelin Protein [D08.811.277.656.300.760.753]
        
        Subtilisins [D08.811.277.656.300.760.787]
        
        Thrombin [D08.811.277.656.300.760.855]
        
        Tissue Plasminogen Activator [D08.811.277.656.300.760.875]
        
        Trypsin [D08.811.277.656.300.760.895]
        
        Tryptases [D08.811.277.656.300.760.902]
        
        Urokinase-Type Plasminogen Activator [D08.811.277.656.300.760.910]
        
        Venombin A [D08.811.277.656.300.760.955]

Enzymes and Coenzymes [D08]
- Enzymes [D08.811]
  - Hydrolases [D08.811.277]
    - Peptide Hydrolases [D08.811.277.656]
      - Serine Proteases [D08.811.277.656.959]
        
        Serine Endopeptidases [D08.811.277.656.959.350]
        
        Acrosin [D08.811.277.656.959.350.030]
        
        Cathepsin G [D08.811.277.656.959.350.066]
        
        Chymases [D08.811.277.656.959.350.103]
        
        Chymotrypsin [D08.811.277.656.959.350.176]
        
        Complement Factor B [D08.811.277.656.959.350.198]
        
        Complement Factor D [D08.811.277.656.959.350.200]
        
        Complement Factor I [D08.811.277.656.959.350.210]
        
        Endopeptidase K [D08.811.277.656.959.350.247]
        
        Enteropeptidase [D08.811.277.656.959.350.284]
        
        Factor VIIa [D08.811.277.656.959.350.300]
        
        Factor IXa [D08.811.277.656.959.350.310]
        
        Factor Xa [D08.811.277.656.959.350.315]
        
        Factor XIa [D08.811.277.656.959.350.320]
        
        Factor XIIa [D08.811.277.656.959.350.324]
        
        Fibrinolysin [D08.811.277.656.959.350.330]
        
        Furin [D08.811.277.656.959.350.353]
        
        Granzymes [D08.811.277.656.959.350.397]
        
        High-Temperature Requirement A Serine Peptidase 1 [D08.811.277.656.959.350.420]
        
        High-Temperature Requirement A Serine Peptidase 2 [D08.811.277.656.959.350.431]
        
        Kallikreins [D08.811.277.656.959.350.442]
        
        Lactoferrin [D08.811.277.656.959.350.471]
        
        Mannose-Binding Protein-Associated Serine Proteases [D08.811.277.656.959.350.501]
        
        Myeloblastin [D08.811.277.656.959.350.530]
        
        Pancreatic Elastase [D08.811.277.656.959.350.560]
        
        Plasminogen Activators [D08.811.277.656.959.350.635]
        
        Pronase [D08.811.277.656.959.350.638]
        
        Proprotein Convertase 1 [D08.811.277.656.959.350.640]
        
        Proprotein Convertase 2 [D08.811.277.656.959.350.646]
        
        Proprotein Convertase 5 [D08.811.277.656.959.350.648]
        
        Proprotein Convertase 9 [D08.811.277.656.959.350.718]
        
        Reelin Protein [D08.811.277.656.959.350.753]
        
        Subtilisins [D08.811.277.656.959.350.787]
        
        Thrombin [D08.811.277.656.959.350.855]
        
        Tissue Plasminogen Activator [D08.811.277.656.959.350.875]
        
        Trypsin [D08.811.277.656.959.350.895]
        
        Tryptases [D08.811.277.656.959.350.902]
        
        Urokinase-Type Plasminogen Activator [D08.811.277.656.959.350.910]
        
        Venombin A [D08.811.277.656.959.350.955]

Amino Acids, Peptides, and Proteins [D12]
- Proteins [D12.776]
  - Blood Proteins [D12.776.124]
    - Blood Coagulation Factors [D12.776.124.125]
      - Factor XII [D12.776.124.125.450]
        
        Factor XIIa [D12.776.124.125.450.324]

Biological Factors [D23]
- Blood Coagulation Factors [D23.119]
  - Factor XII [D23.119.450]
    - Factor XIIa [D23.119.450.324]

Factor XIIa Preferred

Concept UI: M0024400
Scope Note: Activated form of factor XII. In the initial event in the intrinsic pathway of blood coagulation, kallikrein (with cofactor HIGH MOLECULAR WEIGHT KININOGEN) cleaves factor XII to XIIa. Factor XIIa is then further cleaved by kallikrein, plasmin, and trypsin to yield smaller factor XII fragments (Hageman-Factor fragments). These fragments increase the activity of prekallikrein to kallikrein but decrease the procoagulant activity of factor XII.
Terms: Factor XIIa Preferred Term
Term UI T047354
Date01/01/1999
LexicalTag NON
ThesaurusID NLM (1990); Factor 12A
Term UI T000913577
Date01/04/2017
LexicalTag NON
ThesaurusID NLM (2018); Activated Factor XII
Term UI T047351
Date04/24/1989
LexicalTag NON
ThesaurusID NLM (1990); Factor XII, Activated
Term UI T047352
Date05/17/1989
LexicalTag NON
ThesaurusID NLM (1990); Blood Coagulation Factor XII, Activated
Term UI T047353
Date04/24/1989
LexicalTag NON
ThesaurusID NLM (1990); Prekallikrein Activator
Term UI T047355
Date04/24/1989
LexicalTag NON
ThesaurusID NLM (1990); Factor Twelve A
Term UI T000913576
Date01/04/2017
LexicalTag NON
ThesaurusID NLM (2018); Coagulation Factor XIIa
Term UI T047356
Date07/31/1996
LexicalTag NON
ThesaurusID NLM (1998)

Hageman-Factor Fragments Narrower

Factor XIIa MeSH Descriptor Data 2025