Natural and recombinant human LDL R. This assay also recognizes recombinant human LDL R/PCSK9 complex.
< 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 LDL R Immunoassay is a 4.5 hour solid-phase ELISA designed to measure human LDL R in cell culture supernates, cell lysates, serum, heparin plasma, and urine. It contains NS0-expressed recombinant human LDL R and has been shown to accurately quantitate the recombinant factor. Results obtained using natural human LDL R 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 LDL R.
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.
The recovery of human LDL R spiked to levels throughout the range of the assay in various matrices was evaluated.
Average % Recovery
Cell Culture Media (n=4)
To assess the linearity of the assay, samples containing and/or spiked with high concentrations of human LDL R were diluted with Calibrator Diluent to produce samples with values within the dynamic range of the assay. Samples were diluted prior to assay.
Preparation and Storage
Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Background: LDL R
LDL R (Low Density Lipoprotein Receptor) is a widely expressed cell surface scavenger receptor. LDL R binds ApoB and ApoE, the apolipoproteins of low- and very low-density lipoproteins (LDL and VLDL), respectively. Hepatocyte LDL R is responsible for endocytosis and clearing of most plasma LDL cholesterol. At the low pH of the endocytic vesicle, it dissociates, allowing degradation of LDL and recycling of LDL R to the cell surface. Lack of LDL R expression or function causes familial hypercholesterolemia (FH). The protease PCSK9 can also cause increased plasma cholesterol by promoting LDL R degradation rather than recycling to the cell surface.
Low Density Lipoprotein Receptor
Entrez Gene IDs
3949 (Human); 16835 (Mouse); 300438 (Rat);
FH; FHC; LDL receptor; LDLCQ2; LDLR; low density lipoprotein receptor; low-density lipoprotein receptor class A domain-containing protein 3; low-density lipoprotein receptor;