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-P99886
    Pexelizumab
    		Inhibitor
    Pexelizumab (h5G1. 1-SC) is a humanized scFv monoclonal antibody directed against the C5 complement component. Pexelizumab inhibits apoptosis and leukocyte infiltration. Pexelizumab can be used for the research of cerebral IR injury and myocardial infarction.
    Pexelizumab
  • HY-B0579S2
    Cyclosporin A acetate-d4
    		Inhibitor 99.90%
    Cyclosporin A acetate-d4 (Cyclosporine A acetate-d4; Ciclosporin A acetate-d4) is a deuterium labeled Cyclosporin A (HY-B0579). Cyclosporin A (Cyclosporine A) is an immunosuppressant which binds to the cyclophilin and inhibits phosphatase activity of protein phosphatase 2B (PP2B/calcineurin) with an IC50 of 5 nM. Cyclosporin A also inhibits CD11a/CD18 adhesion.
    Cyclosporin A acetate-d<sub>4</sub>
  • HY-14648S5
    Dexamethasone-d3-1
    		Inhibitor 98.02%
    Dexamethasone-d3-1 (Hexadecadrol-d3-1; Prednisolone F-d3-1) is a deuterium labeled Dexamethasone (HY-14648). 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>3</sub>-1
  • HY-149278
    Complement C1s-IN-1
    		Inhibitor
    Complement C1s-IN-1 is a potent, selective, orally active and cross the blood-brain barrier C1s inhibitor with an IC50 value of 36 nM.
    Complement C1s-IN-1
  • HY-N7401
    Entadamide-A-β-D-glucopyranoside
    		98.15%
    Entadamide-A-β-D-glucopyranoside is one of the major components in the seeds of Entada phaseoloides. Entadamide-A-β-D-glucopyranoside has anti-complement activitie.
    Entadamide-A-β-D-glucopyranoside
  • HY-P990753
    Omoprubart
    Omoprubart is an anti-C5 human IgG2-G4 κ monoclonal antibody.
    Omoprubart
  • HY-50874
    BCX 1470
    		Inhibitor
    BCX 1470 inhibits the esterolytic activity of factor D (IC50=96 nM) and C1s (IC50=1.6 nM), 3.4- and 200-fold better, respectively, than that of trypsin.
    BCX 1470
  • HY-B0579S5
    Cyclosporin A-d12
    		Inhibitor
    Cyclosporin A-d12 (Cyclosporine A-d12) is deuterium labeled Cyclosporin A. Cyclosporin A (Cyclosporine A) is an immunosuppressant which binds to the cyclophilin and inhibits phosphatase activity of protein phosphatase 2B (PP2B/calcineurin) with an IC50 of 5 nM. Cyclosporin A also inhibits CD11a/CD18 adhesion.
    Cyclosporin A-d<sub>12</sub>
  • HY-138281
    Complement factor D-IN-2
    		Inhibitor 99.33%
    Complement factor D-IN-2 is an inhibitor of complement factor D extracted from patent WO2015130838A1, compound 190. Complement factor D-IN-2 targets factor D and inhibits the complement cascade at an early and essential point in the alternative complement pathway. Complement factor D-IN-2 can be used for the research of autoimmune diseases.
    Complement factor D-IN-2
  • HY-P990998
    Greziprubart
    		Inhibitor
    HY-P990998 is an C5a-targeting IgG1κ type human antibody, the recommed isotype control is Human IgG1 kappa, Isotype Control (HY-P99001).
    Greziprubart
  • HY-148370
    IONIS-FB-LRx
    		Inhibitor
    IONIS-FB-LRx is a specific antisense oligonucleotide (ASO) targeting complement factor B (CFB). IONIS-FB-LRx effectively reduces circulating levels of CFB. IONIS-FB-LRx can be used for geographic atrophy (GA) research.
    IONIS-FB-LRx
  • HY-P10274
    CM05
    		Inhibitor
    CM05 is a bromo-fatty acid. CM05 can be used to modify ornithodoros moubata complement inhibitor (OmCI) and extend the half-life of OmCI.
    CM05
  • HY-P10994
    Eps8 peptide 327
    		Inhibitor
    Eps8 peptide 327 is an HLA-A*2402-restricted peptide antigen derived from Eps8 protein. Eps8 peptide 327 has potent antitumor activity with significant cytotoxicity. Eps8 peptide 327 effectively inhibits cancer cells proliferation, induces apoptosis and disrupts EGFR signal pathway by inhibiting downstream signals (such as IL-2, TNF-α and IFN-γ) expression and the Eps8/EGFR interaction. Eps8 peptide 327 significantly inhibits tumor growth in HT-29 xenograft mcie models.
    Eps8 peptide 327
  • HY-P10788
    CK3 peptide
    		Inhibitor
    CK3 peptide is an NRP-1 targeting peptide with the amino acid sequence CLKADKAKC. The CK3 peptide specifically binds to NRP-1 to target breast cancer cells. Single-photon emission computed tomography (SPECT) and near-infrared fluorescence (NIRF) imaging show significant accumulation of CK3 peptide in xenograft tumors in nude mice. CK3 peptide can be used for molecular imaging studies of breast cancer.
    CK3 peptide
  • HY-N10400
    Campneoside II
    		Inhibitor
    Campneoside II is a compound isolated from Paulownia tomentosa var. tomentosa wood. Campneoside II exhibits excellent anti-complement activity.
    Campneoside II
  • HY-147606
    Factor B-IN-4
    		Inhibitor
    Factor B-IN-4 (Example 13 target compound) is a potent complement factor B inhibitor, with an IC50 of 1 μM. Factor B-IN-4 can be used for the research of diseases related to inflammation and immunity.
    Factor B-IN-4
  • HY-178284
    Factor B-IN-7
    		Inhibitor
    Factor B-IN-7 (Compound (I)) is a selective Factor B inhibitor. Factor B-IN-7 inhibits Factor B-C3b interaction to suppress complement hyperactivation. Factor B-IN-7 is promising for research of paroxysmal nocturnal hemoglobinuria (PNH), C3 glomerulopathy, and age-related macular degeneration (AMD) associated with complement-mediated diseases.
    Factor B-IN-7
  • HY-163378
    C5aR1 antagonist 1
    		Antagonist
    C5aR1 antagonist 1 (Compound 7e) is an orally active C5a receptor 1 (C5aR1) antagonist. C5aR1 antagonist 1 is active in DISCO and migration assays, with IC50 values of 38 nM and 17 nM, respectively. C5aR1 antagonist 1 can be used for the research of acute and chronic inflammatory diseases.
    C5aR1 antagonist 1
  • HY-NP0194B
    C1q Protein (rabbit)
    C1q Protein (rabbit) is the subunit of the complement system. C1q Protein (rabbit) recognizes a variety of ligands, and is involved in maintaining immune system balance, promoting tissue repair, and defending against pathogens.
    C1q Protein (rabbit)
  • HY-177388
    Factor B-IN-6
    		Inhibitor
    Factor B-IN-6 is an orally active Factor B inhibitor. Factor B-IN-6 exhibits significant inhibitory activity against activation of the human serum serotonin pathway. Factor B-IN-6 can improve the severity of renal lesions and renal function, and reduce urinary protein in animal models. Factor B-IN-6 is useful for kidney disease research.
    Factor B-IN-6
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity