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-N10104
    Citrostadienol
    		Inhibitor
    Citrostadienol is a steroid compound with anti-inflammatory and anticomplementary activities. Citrostadienol demonstrates inhibition activities on classical complement pathway (IC50 of 46 nM).
    Citrostadienol
  • HY-P1640
    (Trp63,Trp64)​-​C3a(63-77)
    		Agonist
    (Trp63,Trp64)​-​C3a(63-77) is a C3a synthetic analogue peptide, which exhibits Ca2+ stimulating efficacy in human neutrophils and hC3aR or mC3aR expressing RBL-2H3 cells with EC50 of 9.5, 2.0 and 0.8 nM, respectively.
    (Trp63,Trp64)​-​C3a(63-77)
  • HY-P1505
    C3a (70-77)
    C3a (70-77) is an octapeptide corresponding to the COOH terminus of C3a, exhibits the specificity and 1 to 2% biologic activities of C3a.
    C3a (70-77)
  • HY-P4971
    C5a Anaphylatoxin (human)
    		Modulator
    C5a Anaphylatoxin (human) is a pro-inflammatory peptide and a leukocyte chemoattractant. C5a Anaphylatoxin (human) can be used to study inflammation and immunity, such as allergic asthma.
    C5a Anaphylatoxin (human)
  • HY-P3502A
    Zilucoplan TFA
    		Inhibitor
    Zilucoplan TFA (RA101495), a 15-amino acid macrocyclic peptide, is a potent complement component 5 (C5) inhibitor. Zilucoplan TFA can be used in research of immune-mediated necrotising myopathy (IMNM).
    Zilucoplan TFA
  • HY-163684
    Zoracopan
    		Inhibitor
    Zoracopan is a selective complement factor D (CFD) inhibitor. When administered systemically (orally or intravenously), Zoracopan accumulates and is sustained-released in ocular tissues, primarily in the choroid-retinal pigment epithelium (C-RPE) and/or iridociliary body (I-CB).
    Zoracopan
  • HY-P3204A
    POT-4 TFA
    		Inhibitor
    POT-4 TFA (AL-78898A TFA), a Compstatin derivative, is a potent inhibitor of complement factor C3 activation. POT-4 TFA can be used for age-related macular degeneration research.
    POT-4 TFA
  • HY-14648R
    Dexamethasone (Standard)
    		Inhibitor
    Dexamethasone (Standard) is the analytical standard of Dexamethasone. This product is intended for research and analytical applications. 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 (Standard)
  • HY-147585
    C5aR-IN-1
    C5aR-IN-1 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-1 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 47).
    C5aR-IN-1
  • HY-14648S2
    Dexamethasone-d4
    		Inhibitor
    Dexamethasone-d4 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>4</sub>
  • HY-W371164
    C1s-IN-1
    		Inhibitor
    C1s-IN-1 (compound A1) is a selective and competitive inhibitor of C1s. C1s-IN-1 binds directly to C1s with a Kd of 9.8 μM.
    C1s-IN-1
  • HY-147587
    C5aR-IN-3
    C5aR-IN-3 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-3 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 89).
    C5aR-IN-3
  • HY-P1345
    TLQP-21
    		Agonist
    TLQP-21, a VGF-derived peptide endowed of endocrine and extraendocrine properties, is a potent G-protein-coupled receptor complement-3a receptor 1 (C3aR1) agonist (EC50: mouse TLQP-21=10.3 μM; human TLQP-21=68.8 μM). TLQP-21 activates C3aR1 to induce an increase of intracellular Ca2+. TLQP-21 is used for the research in regulation of nociception and other relevant physiologic functions.
    TLQP-21
  • HY-147586
    C5aR-IN-2
    C5aR-IN-2 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-2 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 49).
    C5aR-IN-2
  • HY-W049802
    N-((Allyloxy)carbonyl)-N-methyl-L-alanine
    		Inhibitor
    N-((Allyloxy)carbonyl)-N-methyl-L-alanine is a Alanine derivative. N-((Allyloxy)carbonyl)-N-methyl-L-alanine can be used for the synthesis of inhibitors of complement factor D. Complement factor D inhibitors can be used in the research of immune system related disease.
    N-((Allyloxy)carbonyl)-N-methyl-L-alanine
  • HY-P5506
    C5a Receptor agonist, mouse, human
    		Agonist
    C5a Receptor agonist, mouse, human is a biological active peptide. (This peptide is derived from the C-terminus of the chemokine, complement fragment 5 anaphylatoxin (C5a). This peptide functions as a C5a receptor agonist. C5a is a plasma protein involved in cellular inflammatory processes by inducing chemotaxis, degranulation of leukocytes, increased vascular permeability, and cytokine production. The cyclohexylalanine at position 5 is crucial to agonist function. Arg at the last position is of the d-isomer.)
    C5a Receptor agonist, mouse, human
  • HY-P99767
    Olendalizumab
    		Inhibitor
    Olendalizumab (ALXN1007) is a mouse-derived and humanized IgG2-G4-κ antibody, targeting to Complement protein C5a (Ki=60 pM). Olendalizumab targets the complement inflammatory pathway. Moreover, Olendalizumab can be used for research of complement mediated disorder caused by corona virus.
    Olendalizumab
  • HY-B0579S1
    Cyclosporin A-d3
    Cyclosporin A-d3 is the d3-labeled Cyclosporin A (HY-B0579)[1].
    Cyclosporin A-d<sub>3</sub>
  • 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-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
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity