Phone: 1-617-401-8149
Fax: 1-617-606-5019
Email: message@sydlabs.com
Or leave a message with a formal purchase
order (PO) Or credit card.
| Catalog No. | Product Name | Size | List Price (US$) | Quantity |
|---|
Condition of sample preparation and optimal sample dilution should be determined experimentally by the investigator.
Price/availability/specifications subject to change without notice. Unless otherwise indicated, our catalog and customized products are for research use only and not intended for human or animal diagnostic or therapeutic use.
Phone: 1-617-401-8149
Fax: 1-617-606-5019
Email: message@sydlabs.com
Or leave a message with a formal purchase
order (PO) Or credit card.
EK000091-EK0670: Human Cathepsin B ELISA Kit
Range: 156 pg/ml - 10 ng/ml
Sensitivity: < 5 pg/ml
Specificity: no detectable cross-reactivity with any other cytokine.
Application: for quantitative detection of human Cathepsin B 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 B is an enzymatic protein belonging to the peptidase or protease families. In humans, it is coded by the CTSB gene.1, 2 And this gene is mapped to chromosome 8p22.3 The protein encoded by this gene is a lysosomal cysteine proteinase composed of a dimer of disulfide-linked heavy and light chains, both produced from a single protein precursor. It is a member of the peptidase C1 family. Cathepsin B was once suspected as a candidate protease participating in the conversion of β-amyloid precursor protein into the amyloid plaques found in Alzheimer's disease patients. However, this function is now known to be mediated by BACE1 protease. It is now thought that cathepsin B can degrade beta-amyloid precursor protein into harmless fragments. Thus, it is conceivable cathepsin B may play a pivotal role in the natural defense against Alzheimer's disease.4 Overexpression of cathepsin B has been associated with esophageal adenocarcinoma and other tumors. At least five transcript variants encoding the same protein have been found for this gene. The standard product used in this kit is recombinant human Cathepsin B with the molecular mass of 37 KDa.
test
Principle
The ELISA Kit is based on standard sandwich enzyme-linked immune-sorbent assay technology. The target specific antibodies are precoated onto 96-well plates. The target from the sample is bound to the microwell. The biotinylated target specific detection antibodies are added to the microwells and followed by washing with the PBS or TBS buffer. Avidin-Biotin-Peroxidase Complex is added and unbound conjugates are washed away with the PBS or TBS buffer. TMB, the HRP (horseradish peroxidase) substrate, is used to visualize color change resulting from the HRP enzymatic reaction. TMB is catalyzed by HRP to produce the blue color. The color changes into yellow after the acidic stop solution is added. The density of the yellow color is proportional to the target amount from the sample captured in the microwells.
Reference
1. Chan SJ, San Segundo B, McCormick MB, Steiner DF (October 1986). "Nucleotide and predicted amino acid sequences of cloned human and mouse preprocathepsin B cDNAs". Proc. Natl. Acad. Sci. U.S.A. 83 (20): 7721?5.
2. Cao L, Taggart RT, Berquin IM, Moin K, Fong D, Sloane BF (February 1994). "Human gastric adenocarcinoma cathepsin B: isolation and sequencing of full-length cDNAs and polymorphisms of the gene". Gene 139 (2): 163?9.
3. Wang, X.; Chan, S. J.; Eddy, R. L.; Byers, M. G.; Fukushima, Y.; Henry, W. M.; Haley, L. L.; Steiner, D. F.; Shows, T. B. : Chromosome assignment of cathepsin B (CTSB) to 8p22 and cathepsin H (CTSH) to 15q24-q25. (Abstract) Cytogenet. Cell Genet. 46: 710-711, 1987.
4. Mueller-Steiner S, Zhou Y, Arai H, Roberson ED, Sun B, Chen J, Wang X, Yu G, Esposito L, Mucke L, Gan L (September 2006). "Antiamyloidogenic and neuroprotective functions of cathepsin B: implications for Alzheimer's disease". Neuron 51 (6): 703-14.
Copyright © 2009-2022 sydlabs.com. All rights reserved.
Use of this website means that you have read, understood, and accepted the Syd Labs Privacy Policy and Terms & Conditions.