Key features and details
- Sensitivity: 99 pg/ml
- Range: 0.24 ng/ml - 2.5 ng/ml
- Sample type: Cell culture supernatant, Cell Lysate, Cerebral Spinal Fluid, Milk, Plasma, Saliva, Serum, Urine
- Detection method: Colorimetric
- Assay type: Sandwich (quantitative)
- Reacts with: Human
Product nameHuman Complement C3b ELISA Kit
Intra-assay Sample n Mean SD CV% Overall 5.2% Inter-assay Sample n Mean SD CV% Overall 9.5%
Sample typeCell culture supernatant, Saliva, Milk, Urine, Serum, Plasma, Cell Lysate, Cerebral Spinal Fluid
Assay typeSandwich (quantitative)
Range0.24 ng/ml - 2.5 ng/ml
Assay time4h 00m
Assay durationMultiple steps standard assay
Species reactivityReacts with: Human
Abcam’s Complement C3b Human in vitro ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for the quantitative measurement of Complement C3b concentrations in Human plasma, serum, urine, milk, saliva, CSF, cell lysate and cell culture supernatants.
A Complement C3b specific antibody has been precoated onto 96-well plates and blocked. Standards or test samples are added to the wells and subsequently a Complement C3b specific biotinylated detection antibody is added and then followed by washing with wash buffer. Streptavidin-Peroxidase Conjugate is added and unbound conjugates are washed away with wash buffer. TMB is then used to visualize Streptavidin-Peroxidase enzymatic reaction. TMB is catalyzed by Streptavidin-Peroxidase to produce a blue color product that changes into yellow after adding acidic stop solution. The density of yellow coloration is directly proportional to the amount of Complement C3b captured in plate.
The entire kit may be stored at -20°C for long term storage before reconstitution - Avoid repeated freeze-thaw cycles.
Storage instructionsStore at -20°C. Please refer to protocols.
Components 1 x 96 tests 100X Streptavidin-Peroxidase Conjugate 1 x 80µl 10X Diluent M Concentrate 1 x 30ml 20X Wash Buffer Concentrate 2 x 30ml Biotinylated Complement C3b Antibody (50X) 1 x 120µl Chromogen Substrate 1 x 8ml Human Complement C3b Microplate (12 x 8 well) 1 unit Human Complement C3b Standard (Lyophilised) 1 vial Sealing Tapes 3 units Stop Solution 1 x 12ml
FunctionC3 plays a central role in the activation of the complement system. Its processing by C3 convertase is the central reaction in both classical and alternative complement pathways. After activation C3b can bind covalently, via its reactive thioester, to cell surface carbohydrates or immune aggregates.
Derived from proteolytic degradation of complement C3, C3a anaphylatoxin is a mediator of local inflammatory process. It induces the contraction of smooth muscle, increases vascular permeability and causes histamine release from mast cells and basophilic leukocytes.
Acylation stimulating protein (ASP): adipogenic hormone that stimulates triglyceride (TG) synthesis and glucose transport in adipocytes, regulating fat storage and playing a role in postprandial TG clearance. Appears to stimulate TG synthesis via activation of the PLC, MAPK and AKT signaling pathways. Ligand for C5AR2. Promotes the phosphorylation, ARRB2-mediated internalization and recycling of C5AR2.
Tissue specificityPlasma. The acylation stimulating protein (ASP) is expressed in adipocytes and released into the plasma during both the fasting and postprandial periods.
Involvement in diseaseComplement component 3 deficiency
Age-related macular degeneration 9
Hemolytic uremic syndrome atypical 5
Increased levels of C3 and its cleavage product ASP, are associated with obesity, diabetes and coronary heart disease. Short-term endurance training reduces baseline ASP levels and subsequently fat storage.
Sequence similaritiesContains 1 anaphylatoxin-like domain.
Contains 1 NTR domain.
modificationsC3b is rapidly split in two positions by factor I and a cofactor to form iC3b (inactivated C3b) and C3f which is released. Then iC3b is slowly cleaved (possibly by factor I) to form C3c (beta chain + alpha' chain fragment 1 + alpha' chain fragment 2), C3dg and C3f. Other proteases produce other fragments such as C3d or C3g. C3a is further processed by carboxypeptidases to release the C-terminal arginine residue generating the acylation stimulating protein (ASP). Levels of ASP are increased in adipocytes in the postprandial period and by insulin and dietary chylomicrons.
Phosphorylation sites are present in the extracellular medium.
- Information by UniProt
- Acylation stimulating protein cleavage product
ab195461 has been referenced in 2 publications.
- Ellinghaus U et al. Dysregulated CD46 shedding interferes with Th1-contraction in systemic lupus erythematosus. Eur J Immunol 47:1200-1210 (2017). Sandwich ELISA . PubMed: 28444759
- Lui H et al. Progranulin Deficiency Promotes Circuit-Specific Synaptic Pruning by Microglia via Complement Activation. Cell 165:921-35 (2016). Sandwich ELISA ; Human . PubMed: 27114033