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EK000139-EK0672: Human Cathepsin D ELISA Kit
Range 156pg/ml-10,000pg/ml
Sensitivity < 10pg/ml
Specificity: no detectable cross-reactivity with any other cytokine.
Application: for quantitative detection of Human Cathepsin D in sera, plasma, body fluids, tissue lysates or cell culture supernates.
Expiration: four months at 4°C and eight months at -20°C.
Background
Cathepsin D is a protein that in humans is encoded by the CTSD gene. This proteinase is a member of the peptidase C1 family, having a specificity similar to but narrower than that of pepsin A. It is mapped to 11p15.5. The cDNA encodes a 412-amino acid protein with 20 and 44 amino acids in a pre- and prosegment, respectively. Cathepsin D is one of the lysosomal proteinases. It is ubiquitously expressed and is involved in proteolytic degradation, cell invasion, and apoptosis. Mutations in this gene are involved in the pathogenesis of several diseases, including breast cancer and possibly Alzheimer disease and it has been considered as a breast cancer tumor marker.
Principle
The human Cathepsin D ELISA Kit was based on standard sandwich enzyme-linked immune-sorbent assay technology. Human Cathepsin D specific-specific polyclonal antibodies were precoated onto 96-well plates. The human specific detection polyclonal antibodies were biotinylated. The test samples and biotinylated detection antibodies were added to the wells subsequently and then followed by washing with PBS or TBS buffer. Avidin-Biotin-Peroxidase Complex was added and unbound conjugates were washed away with PBS or TBS buffer. HRP substrate TMB was used to visualize HRP enzymatic reaction. TMB was catalyzed by HRP to produce a blue color product that changed into yellow after adding acidic stop solution. The density of yellow is proportional to the human Cathepsin D amount of sample captured in plate.
Reference
1. Faust PL, Kornfeld S, Chirgwin JM (Sep 1985). "Cloning and sequence analysis of cDNA for human cathepsin D". Proc Natl Acad Sci U S A 82 (15): 4910?. doi:10.1073/pnas.82.15.4910. PMC 390467. PMID 3927292.
2. Wolf M, Clark-Lewis I, Buri C, Langen H, Lis M, Mazzucchelli L (April 2003). "Cathepsin D specifically cleaves the chemokines macrophage inflammatory protein-1 alpha, macrophage inflammatory protein-1 beta, and SLC that are expressed in human breast cancer". Am. J. Pathol. 162 (4): 1183?0. PMC 1851240. PMID 12651610.
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