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Coagulation, Bradykinin, Polyphosphates, and Angioedema
Research Guide
What is Coagulation, Bradykinin, Polyphosphates, and Angioedema?
Coagulation, Bradykinin, Polyphosphates, and Angioedema refers to the interconnected molecular mechanisms involving the contact activation system, coagulation factors XII and XI, polyphosphate-mediated bradykinin production, and C1 inhibitor deficiency that drive the pathophysiology of hereditary angioedema.
This field examines how polyphosphates activate factor XII in the contact system, leading to kallikrein generation and excessive bradykinin production in C1 inhibitor-deficient states, resulting in angioedema attacks. Coagulation factors XII and XI link thrombosis risk to bradykinin pathways, with bradykinin-receptor antagonists used for treatment. The cluster includes 45,771 papers on these topics.
Topic Hierarchy
Research Sub-Topics
Coagulation Factor XII in Hereditary Angioedema
This sub-topic investigates the role of FXII activation in the contact pathway leading to bradykinin generation in HAE pathogenesis. Researchers study FXII mutations, inhibitors, and therapeutic targeting in clinical trials.
Bradykinin Receptor Antagonists in Angioedema
Studies evaluate icatibant and related B2 receptor blockers for acute HAE treatment, including pharmacokinetics, efficacy trials, and resistance mechanisms. Research extends to non-hereditary angioedema applications.
C1 Inhibitor Deficiency Pathophysiology
This area explores SERPING1 mutations causing HAE types I and II, protease dysregulation, and vascular permeability mechanisms. Genetic and proteomic studies inform personalized medicine approaches.
Polyphosphate in Contact Activation
Researchers examine polyphosphate from platelets and microbes as contact pathway initiators, linking to thrombosis and angioedema. Studies use biophysical models and antagonists to dissect signaling cascades.
Factor XI Inhibition for Angioedema Prevention
This sub-topic covers FXI antisense oligonucleotides like fesomersen for HAE prophylaxis, balancing antithrombotic benefits and bleeding risks. Clinical data assess long-term safety and efficacy.
Why It Matters
Uncontrolled bradykinin generation in hereditary angioedema causes life-threatening swelling, managed clinically with bradykinin-receptor antagonists that target kinin receptors. Polyphosphates from activated platelets trigger factor XII-dependent contact activation, contributing to both angioedema and thrombosis, as explored in studies of the contact activation system. C1 inhibitor deficiency underlies pathology, with factor XI antisense oligonucleotides emerging as therapies to reduce bradykinin without broad anticoagulation effects. For example, "Thrombin signalling and protease-activated receptors" by Shaun R. Coughlin (2000) details thrombin's role in protease-activated receptors, connecting coagulation to vascular responses in angioedema contexts.
Reading Guide
Where to Start
"Thrombin signalling and protease-activated receptors" by Shaun R. Coughlin (2000) first, as it explains protease-activated receptors central to coagulation-bradykinin intersections relevant to angioedema pathways.
Key Papers Explained
"Thrombin signalling and protease-activated receptors" by Shaun R. Coughlin (2000) outlines thrombin's signaling via PARs, which connects to factor XI and contact activation; "A common genetic variation in the 3'-untranslated region of the prothrombin gene is associated with elevated plasma prothrombin levels and an increase in venous thrombosis" by SR Poort et al. (1996) links prothrombin variants to thrombosis, paralleling factor XII roles; "Complement" by Mark Walport (2001) details C1 inhibitor's complement regulation, extending to kinin control in angioedema.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research continues on factor XI antisense oligonucleotides for bradykinin suppression in hereditary angioedema, building on contact activation insights. Polyphosphate's role in factor XII-driven thrombosis remains active, with no recent preprints noted.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | TOR Signaling in Growth and Metabolism | 2006 | Cell | 5.7K | ✓ |
| 2 | A Novel Angiotensin-Converting Enzyme–Related Carboxypeptidase... | 2000 | Circulation Research | 3.1K | ✓ |
| 3 | A common genetic variation in the 3'-untranslated region of th... | 1996 | Blood | 3.1K | ✓ |
| 4 | Complement | 2001 | New England Journal of... | 2.9K | ✕ |
| 5 | Rituximab versus Cyclophosphamide for ANCA-Associated Vasculitis | 2010 | New England Journal of... | 2.7K | ✓ |
| 6 | Rictor, a Novel Binding Partner of mTOR, Defines a Rapamycin-I... | 2004 | Current Biology | 2.6K | ✓ |
| 7 | Handbook of Proteolytic Enzymes | 2004 | Elsevier eBooks | 2.6K | ✕ |
| 8 | Thrombin signalling and protease-activated receptors | 2000 | Nature | 2.4K | ✕ |
| 9 | Rho GTPases and signaling networks | 1997 | Genes & Development | 2.4K | ✓ |
| 10 | M-Type Phospholipase A <sub>2</sub> Receptor as Target Antigen... | 2009 | New England Journal of... | 2.2K | ✓ |
Frequently Asked Questions
What role does polyphosphate play in angioedema?
Polyphosphate activates coagulation factor XII, initiating the contact activation system that generates kallikrein and bradykinin. In C1 inhibitor deficiency, this leads to excessive bradykinin and angioedema. Platelet-derived polyphosphates amplify this pathway during attacks.
How does C1 inhibitor deficiency cause hereditary angioedema?
C1 inhibitor normally regulates factor XII and kallikrein in the contact system. Deficiency allows unchecked bradykinin production, causing vascular permeability and swelling. This defines hereditary angioedema pathology.
What are bradykinin-receptor antagonists used for?
Bradykinin-receptor antagonists block kinin receptors to prevent angioedema attacks in C1 inhibitor-deficient patients. They provide targeted treatment without affecting coagulation broadly. Clinical management relies on these for acute and prophylactic care.
How do coagulation factors XII and XI relate to bradykinin production?
Factor XII activation by polyphosphates generates kallikrein, cleaving high-molecular-weight kininogen to bradykinin. Factor XI sustains this cascade, linking coagulation to inflammation. Tissue kallikreins further contribute in angioedema.
What is the contact activation system?
The contact activation system involves factor XII autoactivation on polyphosphate surfaces, leading to factor XI activation and kallikrein formation. This produces bradykinin in angioedema. It intersects with thrombosis pathways.
Open Research Questions
- ? How do polyphosphate chain lengths modulate factor XII activation kinetics in C1 inhibitor-deficient states?
- ? Can factor XI antisense oligonucleotides fully suppress bradykinin generation without thrombosis risk?
- ? What is the contribution of tissue kallikreins versus plasma kallikrein to angioedema attacks?
- ? How does contact activation system dysregulation influence venous thrombosis in hereditary angioedema patients?
- ? Which kinin receptor subtypes predominate in different angioedema tissues?
Recent Trends
The field spans 45,771 papers, focusing on kinin receptors, factor XII, polyphosphates, and C1 inhibitor deficiency, with applications in bradykinin-receptor antagonists and factor XI therapies.
Citation leaders like "Thrombin signalling and protease-activated receptors" by Shaun R. Coughlin (2000, 2430 citations) highlight enduring interest in coagulation-kinin links.
No recent preprints or news in the last 12 months indicate steady rather than accelerating growth.
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