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-147605
    Factor B-IN-3
    		Inhibitor
    Factor B-IN-3 (Example 3 target compound) is a potent complement factor B inhibitor. Factor B-IN-3 can be used for the research of diseases related to inflammation and immunity.
    Factor B-IN-3
  • HY-NP202C
    C5 Protein (human)
    C5 Protein (human) is a naturally occurring glycosylated polypeptide containing two disulfide-linked chains. C5 is essential for the formation of the membrane attack complex (MAC) and is activated by all three pathways of complement activation.
    C5 Protein (human)
  • HY-P991067
    Vensobafusp alfa
    		Inhibitor
    Vensobafusp alfa (KP-104) is a fusion protein composed of an IgG4 monoclonal antibody directed against terminal complement protein C5 fused to the complement factor H 1-5 domain (FH1-5). Vensobafusp alfa shows anti-inflammatory and immunomodulatory activities. The isotype control for Vensobafusp alfa can refer to Human IgG4 (S228P) kappa, Isotype Control (HY-P99003)..
    Vensobafusp alfa
  • HY-16384
    L-156602
    		Antagonist
    L-156602 is a C5a receptor antagonist. L-156602 inhibits inflammation, and the migration of monocytes and neutrophils to the infiltrating site in mouse inflammatory models. L-156602 suppresses the efferent phase of delayed-type hypersensitivity (DTH).
    L-156602
  • HY-147604
    Factor B-IN-2
    		Inhibitor
    Factor B-IN-2 (Example 1 target compound) is a potent complement factor B inhibitor, with an IC50 of 1.5 μM. Factor B-IN-2 can be used for the research of diseases related to inflammation and immunity.
    Factor B-IN-2
  • HY-163062
    Tubulin/NRP1-IN-1
    		Inhibitor
    Tubulin/NRP1-IN-1 (compound TN-2) is a dual inhibitor of Tubulin and NRP1 with IC50s of 0.71 and 0.85 μM, respectively. Tubulin/NRP1-IN-1 significantly inhibits the viability of prostate tumor cell lines and induces apoptosis.
    Tubulin/NRP1-IN-1
  • HY-163379
    C5aR1 antagonist 2
    		Antagonist
    C5aR1 antagonist 2 (Compound 6a) is an orally active C5a receptor 1 (C5aR1) antagonist that shows efficacy in inhibiting the C5a-induced neutrophil count increase. C5aR1 antagonist 2 is potent in the DISCO and migration assays, with IC50 values of 21 and 3 nM, respectively. C5aR1 antagonist 2 can be used for the research of acute and chronic inflammatory diseases.
    C5aR1 antagonist 2
  • HY-N7166
    3-O-(2'E,4'Z-Decadienoyl)ingenol
    		Inhibitor
    3-O-(2'E,4'Z-Decadienoyl)ingenol is a natural diterpene that exhibits significant anticomplement activity with an IC50 of 89.5 μM.
    3-O-(2'E,4'Z-Decadienoyl)ingenol
  • HY-172239
    Tarvicopan
    		Inhibitor
    Tarvicopan is an inhibitor for complement factor D.
    Tarvicopan
  • HY-NP202B
    C4 Protein (human)
    C4 Protein (human) is a naturally occurring glycosylated polypeptide with three disulfide-linked chains. C4 is the activation center of both the classical and lectin pathways of complement activation.
    C4 Protein (human)
  • HY-P991485
    Anti-CD88/C5AR1 Antibody (G2_anti-C5aR)
    		Inhibitor
    Anti-CD88/C5AR1 Antibody (G2_anti-C5aR) is a human monoclonal antibody (mAb) targeting C5AR1.
    Anti-CD88/C5AR1 Antibody (G2_anti-C5aR)
  • HY-P991127
    Claseprubart
    		Inhibitor
    Claseprubart is a monoclonal antibody targeting human complement C1s. Claseprubart specifically binds to complement C1s to inhibit the activation of the complement system, exerting immunosuppressive activity. Claseprubart is promising for research of autoimmune diseases and inflammation-related diseases.
    Claseprubart
  • HY-14648S1
    Dexamethasone-d5-1
    		Inhibitor
    Dexamethasone-d5-1 is deuterium labeled Dexamethasone. Dexamethasone (Hexadecadrol) is a glucocorticoid receptor agonist. Dexamethasone also significantly decreases CD11b, CD18, and CD62L expression on neutrophils, and CD11b and CD18 expression on monocytes. Dexamethasone is highly effective in the control of COVID-19 infection. Dexamethasone inhibits production of exosomes containing inflammatory microRNA-155 in lipopolysaccharide-induced macrophage inflammatory responses.
    Dexamethasone-d<sub>5</sub>-1
  • HY-17627R
    Avacopan (Standard)
    		Inhibitor
    Avacopan (Standard) is the analytical standard of Avacopan. This product is intended for research and analytical applications. Avacopan (CCX168) is a potent, selective and orally available complement 5a receptor (C5aR) inhibitor with an IC50 of 0.1 nM.
    Avacopan (Standard)
  • HY-P990745
    Izastobart
    		Ligand
    Izastobart is an anti-C5AR1 human IgG1 λ2 monoclonal antibody. Recommend Isotype Controls: Human IgG1 lambda2, Isotype Control (HY-P990096).
    Izastobart
  • HY-P10639A
    C5aR2 agonist P32 acetate
    		Agonist
    C5aR2 agonist P32 (Ac-RHYPYWR-OH) acetate is a C5aR2-selective agonist. C5aR2 agonist P32 acetate 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 acetate
  • HY-P3502B
    Zilucoplan (PEG2)
    		Inhibitor
    Zilucoplan (PEG2) is a Zilucoplan (HY-P3502) derivative, where the linker section replaces PEG24 by PEG2. Zilucoplan is a potent complement component 5 (C5) inhibitor.
    Zilucoplan (PEG2)
  • HY-W130878
    4-Octylphenol
    		Activator
    4-Octylphenol is a hormone disruptor that has gender-specific effects on male reproductive cells, significantly reducing the mitotic index and the number of spermatogonia. 4-Octylphenol can cause inflammatory damage to fish gills by activating the complement system through the C3a/C3aR axis and the C5a/C5aR1 axis, this leads to complement activation and causes immune suppression due to the imbalance between Th1/Th2 cells and regulatory T cells (Treg)/Th17 cells, as well as inflammatory damage via the Toll-like receptor 7 (Toll-like Receptor (TLR))/IκBα/NF-κB pathway.
    4-Octylphenol
  • HY-147607
    Lanoracopan
    		Inhibitor
    Factor B-IN-5 (Example 5 target compound) is a potent complement factor B inhibitor, with an IC50 of 1.2 μM. Factor B-IN-5 can be used for the research of diseases related to inflammation and immunity.
    Lanoracopan
  • HY-P990753
    Omoprubart
    Omoprubart is an anti-C5 human IgG2-G4 κ monoclonal antibody.
    Omoprubart
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity