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Complement System Components (C3b, C4b, C3a, C5a) (N/A)
- Target
- N/A
- Molecular classification
- Opsonin, Anaphylatoxin, Complement protein fragment, Peptide, G protein-coupled receptor ligand
01
Overview
The complement system components C3b, C4b, C3a, and C5a are key effector molecules of the complement system, a crucial part of the innate immune system. C3b and C4b function as opsonins, tagging pathogens for phagocytosis. C3a and C5a are anaphylatoxins, inducing inflammation and chemotaxis by binding to C3aR and C5aR, respectively.
- Other names
- C3bC4bC3aC5aiC3bComplement componentsAnaphylatoxinsOpsonins
02
Mechanism of action
Varies depending on the specific component. C3b and C4b act as opsonins, tagging pathogens for phagocytosis. C3a and C5a act as anaphylatoxins, inducing inflammation and chemotaxis by binding to their respective G protein-coupled receptors (C3aR and C5aR).
03
Biological functions
OpsonizationInflammationChemotaxisImmune responseCell lysisPhagocytosisComplement activation
04
Disease associations
Infection susceptibilityAutoimmune diseasesChronic inflammationSystemic lupus erythematosusThrombotic microangiopathy
05
Safety considerations
Dysregulation or deficiency can lead to increased susceptibility to infections, autoimmune diseases, and chronic inflammation.Overactivation can lead to tissue damage and contribute to diseases like systemic lupus erythematosus or thrombotic microangiopathy.
06
Biomarkers
Levels of C3a, C5a, C3b, and C4b can be used to assess complement activation in various diseases.
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