Human Platelet Membrane Glycoprotein IV (GP4) ELISA Kit

Principle of the Assay

The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Human GP4. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human GP4. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Human GP4, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of Human GP4 in the samples is then determined by comparing the OD of the samples to the standard curve.

For use with: Serum, plasma, tissue homogenates, and other biological fluids.

For Research Use Only. Not for use in diagnostic procedures.

Target Information

Multifunctional glycoprotein that acts as receptor for a broad range of ligands. Ligands can be of proteinaceous nature like thrombospondin, fibronectin, collagen or amyloid-beta as well as of lipidic nature such as oxidized low-density lipoprotein (oxLDL), anionic phospholipids, long-chain fatty acids and bacterial diacylated lipopeptides. They are generally multivalent and can therefore engage multiple receptors simultaneously, the resulting formation of CD36 clusters initiates signal transduction and internalization of receptor-ligand complexes. The dependency on coreceptor signaling is strongly ligand specific. Cellular responses to these ligands are involved in angiogenesis, inflammatory response, fatty acid metabolism, taste and dietary fat processing in the intestine (Probable). Binds long-chain fatty acids and facilitates their transport into cells, thus participating in muscle lipid utilization, adipose energy storage, and gut fat absorption (By similarity) (PubMed:18353783, PubMed:21610069). Mechanistically, binding of fatty acids activates downstream kinase LYN, which phosphorylates the palmitoyltransferase ZDHHC5 and inactivates it resulting in the subsequent depalmitoylation of CD36 and caveolar endocytosis (PubMed:32958780). In the small intestine, plays a role in proximal absorption of dietary fatty acid and cholesterol for optimal chylomicron formation, possibly through the activation of MAPK1/3 (ERK1/2) signaling pathway (By similarity) (PubMed:18753675). Involved in oral fat perception and preferences (PubMed:22240721, PubMed:25822988). Detection into the tongue of long-chain fatty acids leads to a rapid and sustained rise in flux and protein content of pancreatobiliary secretions (By similarity). In taste receptor cells, mediates the induction of an increase in intracellular calcium levels by long-chain fatty acids, leading to the activation of the gustatory neurons in the nucleus of the solitary tract (By similarity). Important factor in both ventromedial hypothalamus neuronal sensing of long-chain fatty acid and the regulation of energy and glucose homeostasis (By similarity). Receptor for thrombospondins, THBS1 and THBS2, mediating their antiangiogenic effects (By similarity). As a coreceptor for TLR4:TLR6 heterodimer, promotes inflammation in monocytes/macrophages. Upon ligand binding, such as oxLDL or amyloid-beta 42, interacts with the heterodimer TLR4:TLR6, the complex is internalized and triggers inflammatory response, leading to NF-kappa-B-dependent production of CXCL1, CXCL2 and CCL9 cytokines, via MYD88 signaling pathway, and CCL5 cytokine, via TICAM1 signaling pathway, as well as IL1B secretion, through the priming and activation of the NLRP3 inflammasome (By similarity) (PubMed:20037584). Selective and nonredundant sensor of microbial diacylated lipopeptide that signal via TLR2:TLR6 heterodimer, this cluster triggers signaling from the cell surface, leading to the NF-kappa-B-dependent production of TNF, via MYD88 signaling pathway and subsequently is targeted to the Golgi in a lipid-raft dependent pathway (By similarity) (PubMed:16880211).

GENE ID	948
SWISS PROT	P16671
SYNONYMS	CD36; FAT; GP3B; GPIV; PASIV; SCARB3; GP88; GpIIIb; Glycoprotein IIIb; Collagen Type I Receptor; Thrombospondin Receptor; Fatty acid translocase; Platelet collagen receptor

Materials Supplied

Kit Components	96 Wells Quantity/Size
Pre-Coated Microplate	48T: 6 strips x 8 wells; 96T: 12 strips x 8 wells
Standard (Lyophilized)	48T: 1 vial; 96T: 2 vials
Biotinylated Antibody (100×)	48T: 60 μL; 96T: 120 μL
Streptavidin-HRP (100×)	48T: 60 μL; 96T: 120 μL
Standard/Sample Diluent Buffer	48T: 10 mL; 96T: 20 mL
Biotinylated Antibody Diluent	48T: 6 mL; 96T: 12 mL
HRP Diluent	48T: 6 mL; 96T: 12 mL
Wash Buffer (25×)	48T: 10 mL; 96T: 20 mL
TMB Substrate Solution	48T: 6 mL; 96T: 10 mL
Stop Reagent	48T: 3 mL; 96T: 6 mL
Plate Covers	48T: 1 piece; 96T: 2 pieces

Storage

Storage

*If the kit is opened, Store the whole kit at 4°C. If the kit is not used up in 1 week. Store the Pre-Coated Microplate, Standard ,Biotinylated Antibody and Streptavidin-HRP at -20°C, the rest reagents at 4°C, please used up within 6 months. *If the kit is not opened, store the whole kit: 4°C(short time storage, valid for 6 months); -20°C (long-term storage, valid for 1 year). Avoid repeated freeze-thaw cycles.

Performance Characteristics

REPEATABILITY	Intra-assay Precision (Precision within an assay)：CV% < 8% Three samples of known concentration were tested twenty times on 1 plate to assess intra-assay precision. Inter-assay Precision (precision between assays)：CV% < 10% Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.
SENSITIVITY	The minimum detectable dose was 0.057ng/mL.
ASSAY RANGE	0.16–10ng/mL
SPECIFICITY	This assay has high sensitivity and excellent specificity for detection of Human GP4. No significant cross-reactivity or interference between Human GP4 and analogues was observed.