2. Signaling Pathways
  3. Immunology/Inflammation
  4. Complement System

Complement System

Complement System

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The complement system, composed of more than 30 serum and cell surface components, is collaborating in recognition and elimination of pathogens as a part of both the innate and acquired immune systems. Once the complement system is activated, a chain of reactions involving proteolysis and assembly occurs, resulting in cleavage of the third complement component (C3). The cascade up to C3 cleavage is called the activation pathway. There are three activation pathways: the classical, lectin, and alternative pathways.

The complement cascade is a dual-edged sword, causing protection against bacterial and viral invasion by promoting phagocytosis and inflammation. Pathologically, complement can cause substantial damage to blood vessels (vasculitis), kidney basement membrane and attached endothelial and epithelial cells (nephritis), joint synovium (arthritis), and erythrocytes (hemolysis) if it is not adequately controlled.

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-P1717
    AMY-101
    		Inhibitor 99.86%
    AMY-101 (Cp40), a peptidic inhibitor of the central complement component C3 (KD = 0.5 nM), inhibits naturally occurring periodontitis in non-human primates (NHPs). AMY-101 (Cp40) exhibits a favorable anti-inflammatory activity in models with COVID-19 severe pneumonia with systemic hyper inflammation.
    AMY-101
  • HY-110060
    NDT 9513727
    		Antagonist 99.35%
    NDT 9513727 is a potent, selective, orally active and competitive inverse agonist of the human C5aR (C5a receptor), with an IC50 of 11.6 nM. NDT 9513727 can be used for the research of human inflammatory diseases.
    NDT 9513727
  • HY-147297
    Pelecopan
    		Inhibitor 98.07%
    Pelecopan (BCX9930) is a potent, selective, orally active inhibitor of complement factor D with an IC50 value of 14.3 nM. Pelecopan can target factor D to prevent both intravascular and extravascular hemolysis in PNH. Pelecopan also be used for other alternative pathway (AP) mediated diseases.
    Pelecopan
  • HY-117992
    BR103
    		99.75%
    BR103 is a C3aR-specific small molecule ligand. BR103 can be used to measure ligand affinity for a G protein-coupled receptor for saturation and competitive binding.
    BR103
  • HY-P99638
    Gefurulimab
    		Inhibitor
    Gefurulimab (ALXN-1720) is a high-affinity antibody inhibitor targeting complement protein C5, which can specifically bind to C5 and inhibit its cleavage into C5a and C5b. Gefurulimab can block the activation of the terminal complement pathway and reduce inflammatory damage. Gefurulimab can effectively reduce the formation of membrane attack complex (MAC) and has good pharmacokinetic properties. Gefurulimab can be used to study kidney and autoimmune diseases related to abnormal activation of the complement system, such as IgA nephropathy, lupus nephritis, and myasthenia gravis.
    Gefurulimab
  • HY-N1464A
    Aristolone
    		Inhibitor 99.38%
    Aristolone is a sesquiterpene that can be isolated from Aristolochia debilis, Rosmarinus officinalis and Ficus Auriculata. Aristolone in Ara Fruit can be used as a prediction of apoptosis in HeLa cells. Aristolone inhibits the C1 complement component. Aristolone produces cytotoxicity effects on cells. Aristolone has anticancer properties and can be studied in research for cervical cancer.
    Aristolone
  • HY-NP0194A
    C1q Protein (mouse)
    C1q Protein (mouse) is the subunit of the complement system. C1q Protein (mouse) recognizes a variety of ligands, and is involved in maintaining immune system balance, promoting tissue repair, and defending against pathogens.
    C1q Protein (mouse)
  • HY-P1505A
    C3a (70-77) TFA
    		99.79%
    C3a (70-77) TFA (Complement 3a (70-77) TFA) is an octapeptide corresponding to the COOH terminus of C3a, exhibits the specificity and 1 to 2% biologic activities of C3a.
    C3a (70-77) TFA
  • HY-P5506
    C5a Receptor agonist, W5Cha
    		Agonist 99.50%
    C5a Receptor agonist, W5Cha (Peptide 1) is a selective complement C5a receptor (C5aR) agonist (EC50=0.2 μM), a hexapeptide derived from the C-terminus of C5a with specific amino acid modifications. C5a Receptor agonist, W5Cha is able to interact with the Arg-206 site of the C5a receptor through its C-terminal arginine, thereby activating the receptor.
    C5a Receptor agonist, W5Cha
  • HY-P99786
    Pozelimab
    		Inhibitor 99.42%
    Pozelimab (REGN3918) is a fully human IgG4 anti-C5 monoclonal antibody. Pozelimab binds to C5 and C5 variants with high affinity and blocks complement-mediated hemolysis. Pozelimab can be used for the research of complement-mediated diseases.
    Pozelimab
  • HY-122700
    Factor D inhibitor 6
    		Inhibitor 99.18%
    Factor D inhibitor 6 is a potent, highly selective and orally active factor D (FD) inhibitor with an IC50 of 30 nM and a Kd of 6 nM. Factor D inhibitor 6 is inactive against factor B, lassical and lectin complement-pathway activation, and a broad assay panel of receptors, ion channels, kinases and proteases.
    Factor D inhibitor 6
  • HY-147762
    NRP1 antagonist 2
    		Antagonist 99.05%
    NRP1 antagonist 2 (Compound 1) is an NRP1 antagonist.
    NRP1 antagonist 2
  • HY-P99298
    Lampalizumab
    		Inhibitor 99.46%
    Lampalizumab (RG 7417) is a humanised monoclonal antibody targeting complement Factor D in the alternative complement pathway. Lampalizumab binds an exosite and sterically blocks Factor B access to the active site. Lampalizumab can be used for age-related macular degeneration (AMD) research.
    Lampalizumab
  • HY-102034
    Complement factor D-IN-1
    		98.85%
    Complement factor D-IN-1 is a potent and selective small-molecule reversible factor d inhibitor, with IC50s of 0.006 and 0.05 μM in FD Thioesterolytic Fluorescent Assay and a MAC Deposition Assay, respectively.
    Complement factor D-IN-1
  • HY-P2526
    LyP-1
    		98.46%
    LyP-1 is a cyclic 9-amino-acids tumor homing peptide and selectively bind to p32 receptors overexpressed in various tumor-associated cells.
    LyP-1
  • HY-Y0641
    3-Phenoxybenzaldehyde
    		Inhibitor 99.74%
    3-Phenoxybenzaldehyde has weak complement classical pathway inhibition and hemolytic activity.
    3-Phenoxybenzaldehyde
  • HY-W371165
    C1s-IN-1 trihydrochloride
    		Inhibitor 99.73%
    C1s-IN-1 trihydrochloride (Compound A1) is the selective inhibitor for C1s protease with the Ki of 5.8 μM. C1s-IN-1 trihydrochloride inhibits cleavage of C2 by C1s with an IC50 of 85 μM, inhibits the activation of classic pathway with an IC50 of 22 μM. C1s-IN-1 trihydrochloride is the competitive inhibitor for thrombin with the Ki of 51.2 μM.
    C1s-IN-1 trihydrochloride
  • HY-P10639
    C5aR2 agonist P32
    		Agonist 99.82%
    C5aR2 agonist P32 (Ac-RHYPYWR-OH) is a C5aR2-selective agonist. C5aR2 agonist P32 has been shown to elicit multiple immunomodulatory activities, both by down-regulating the C5aR1-mediated cell signalling, and acting in a C5aR1-independent fashion, in vitro and in vivo.
    C5aR2 agonist P32
  • HY-P1036A
    Compstatin TFA
    		Inhibitor 99.07%
    Compstatin TFA, a 13-residue cyclic peptide, is a potent inhibitor of the complement system C3 with species specificity. Compstatin TFA binds to baboon C3 and is resistant to proteolytic cleavage in baboon blood (similar to humans). Compstatin TFA inhibits only the activation of primates’ complement system. Compstatin TFA exhibits IC50 values of 63 μM and 12 μM for classical and alterative complement pathway, respectively.
    Compstatin TFA
  • HY-145720A
    Cemdisiran sodium
    Cemdisiran sodium is an N-acetylgalactosamine (GalNAc) conjugated siRNA for the research of complement-mediated diseases by suppressing liver production of complement 5 (C5) protein.
    Cemdisiran sodium
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity