< 0.5% cross-reactivity observed with available related molecules.< 50% cross-species reactivity observed with species tested.
No significant interference observed with available related molecules.
The Quantikine Human CD31/PECAM-1 Immunoassay is a 4.5 hour solid-phase ELISA designed to measure human CD31 in cell culture supernates, serum, plasma, saliva, and urine. It contains CHO cell-expressed recombinant human CD31 and has been shown to accurately quantitate the recombinant factor. Results obtained using natural human CD31 showed linear curves that were parallel to the standard curves obtained using the Quantikine kit standards. These results indicate that this kit can be used to determine relative mass values for naturally occurring human CD31.
Intra-Assay Precision (Precision within an assay) Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.
Inter-Assay Precision (Precision between assays) Three samples of known concentration were tested in twenty separate assays to assess inter-assay precision. Assays were performed by at least three technicians using two lots of components.
Serum, EDTA Plasma, Heparin Plasma
Cell Culture Supernates, Saliva, Urine
The recovery of human CD31 spiked to levels throughout the range of the assay in various matrices was evaluated.
Average % Recovery
Cell Culture Media (n=4)
EDTA Plasma (n=4)
Heparin Plasma (n=4)
To assess the linearity of the assay, samples containing and/or spiked with high concentrations of human CD31 were diluted with Calibrator Diluent to produce samples with values within the dynamic range of the assay.
Preparation and Storage
Store the unopened product at 2 - 8 °C. Do not use past expiration date.
CD31/PECAM-1 is a heavily glycosylated transmembrane homophilic adhesion protein that is highly expressed on endothelial cells and at a lower level on platelets, granulocytes, macrophages, dendritic cells, T and B cells, and NK cells. It is required for the transepithelial migration of leukocytes. CD31 signaling increases the activation threshold of T cells and inhibits dendritic cell development. The extracellular domain of CD31 is released during endothelial cell apoptosis. This fragment circulates in the serum of patients suffering from myocardial infarction, acute ischaemic stroke, and multiple sclerosis, conditions that involve tissue damage and endothelial cell apoptosis.