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Citations (8)
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Human Total Cathepsin S DuoSet ELISA Summary

Assay Type
Solid Phase Sandwich ELISA
Format
96-well strip plate
Sample Volume Required
100 µL
Assay Range
15.6 - 1,000 pg/mL
Sufficient Materials
For fifteen 96-well plates*
Specificity
Please see the product datasheet

* Provided that the recommended microplates, buffers, diluents, substrates and solutions are used, and the assay is run as summarized in the Assay Procedure provided.

This DuoSet ELISA Development kit contains the basic components required for the development of sandwich ELISAs to measure natural and recombinant human Total Cathepsin S. The suggested diluent is suitable for the analysis of most cell culture supernate samples. Diluents for complex matrices, such as serum and plasma, should be evaluated prior to use in this DuoSet ELISA.

Product Features

  • Optimized capture and detection antibody pairings with recommended concentrations save lengthy development time
  • Development protocols are provided to guide further assay optimization
  • Assay can be customized to your specific needs
  • Economical alternative to complete kits

Kit Content

  • Capture Antibody
  • Detection Antibody
  • Recombinant Standard
  • Streptavidin conjugated to horseradish-peroxidase (Streptavidin-HRP)

Other Reagents Required


PBS: (Catalog # DY006), or 137 mM NaCl, 2.7 mM KCl, 8.1 mM Na2HPO4, 1.5 mM KH2PO4, pH 7.2 - 7.4, 0.2 µm filtered

Wash Buffer: (Catalog # WA126), or equivalent

Reagent Diluent: 1% BSA in PBS, pH 7.2-7.4, 0.2 m filtered (R&D Systems Catalog # DY995). Quality of BSA is critical (see Technical Hints).

Blocking Buffer: 1% BSA in PBS, pH 7.2-7.4, 0.2 m filtered (R&D Systems Catalog # DY995). Quality of BSA is critical (see Technical Hints).

Substrate Solution: 1:1 mixture of Color Reagent A (H2O2) and Color Reagent B (Tetramethylbenzidine) (Catalog # DY999)

Stop Solution: 2 N H2SO4 (Catalog # DY994)

Microplates: R&D Systems (Catalog # DY990), or equivalent

Plate Sealers: ELISA Plate Sealers (Catalog # DY992), or equivalent

 

Data Example

Human Total Cathepsin S ELISA Standard Curve

Product Datasheets

Preparation and Storage

Shipping
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: Cathepsin S

Cathepsin S is a lysosomal cysteine protease of the papain family. Human Cathepsin S is synthesized as a preproenzyme of 331 amino acid residues consisting a signal peptide (residues 1 - 16), a pro region (residues 17 - 114), and the mature enzyme (residues 115 - 331).

Entrez Gene IDs:
1520 (Human)
Alternate Names:
Cathepsin S; CTSS; EC 3.4.22; EC 3.4.22.27; FLJ50259; MGC3886

Assay Procedure

GENERAL ELISA PROTOCOL

Plate Preparation

  1. Dilute the Capture Antibody (to the working concentration stated in the product datasheet ) in PBS without carrier protein. Immediately coat a 96-well microplate with 100 µL per well of the diluted Capture Antibody. Seal the plate and incubate overnight at room temperature.
  2. Aspirate each well and wash with Wash Buffer, repeating the process two times for a total of three washes. Wash by filling each well with Wash Buffer (400 µL) using a squirt bottle, manifold dispenser, or autowasher. Complete removal of liquid at each step is essential for good performance. After the last wash, remove any remaining Wash Buffer by aspirating or by inverting the plate and blotting it against clean paper towels.
  3. Block each well of the microplate as recommended in the product datasheet. Incubate at room temperature for a minimum of 1 hour.

    Note: The recommended Reagent Diluent typically contains 1% BSA. Some DuoSet Development Kits require alternative blocking agents, or for plates to be blocked overnight with a higher percentage of BSA, please see the product datasheet for details.
     
  4. Repeat the aspiration/wash as in step 2. The plates are now ready for sample addition.

 

PRECAUTION
The Stop Solution suggested for use with this kit is an acid solution. Wear eye, hand, face and clothing protection when using this material.

Assay Procedure

  1. Add 100 µL of sample or standards in Reagent Diluent, or an appropriate diluent, per well. Cover with an adhesive strip and incubate 2 hours at room temperature.
  2. Repeat the aspiration/wash as in step 2 of Plate Preparation.
  3. Add 100 µL of the Detection Antibody, diluted in Reagent Diluent (as recommended in the product datasheet), to each well. Cover with a new adhesive strip and incubate 2 hours at room temperature.
  4. Repeat the aspiration/wash as in step 2 of Plate Preparation.
  5. Add 100 µL of the working dilution of Streptavidin-HRP to each well. Cover the plate and incubate for 20 minutes at room temperature. Avoid placing the plate in direct light.
  6. Repeat the aspiration/wash as in step 2.
  7. Add 100 µL of Substrate Solution to each well. Incubate for 20 minutes at room temperature. Avoid placing the plate in direct light.
  8. Add 50 µL of Stop Solution to each well. Gently tap the plate to ensure thorough mixing.
  9. Determine the optical density of each well immediately, using a microplate reader set to 450 nm. If wavelength correction is available, set to 540 nm or 570 nm. If wavelength correction is not available, subtract readings at 540 nm or 570 nm from the readings at 450 nm. This subtraction will correct for optical imperfections in the plate. Readings made directly at 450 nm without correction may be higher and less accurate.

Citations for Human Total Cathepsin S DuoSet ELISA

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

8 Citations: Showing 1 - 8
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  1. Blood inflammatory and endothelial markers in women with von Willebrand disease
    Authors: I Govorov, K Bremme, A Larsson, M Holmström, E Komlichenk, R Chaireti, M Mints
    PLoS ONE, 2019;14(1):e0210544.
    Species: Human
    Sample Types: Plasma
  2. Circulating cathepsin-S levels correlate with GFR decline and sTNFR1 and sTNFR2 levels in mice and humans
    Authors: D Steubl, SV Kumar, M Tato, SR Mulay, A Larsson, L Lind, U Risérus, L Renders, U Heemann, AC Carlsson, J Ärnlöv, HJ Anders
    Sci Rep, 2017;7(0):43538.
    Species: Human
    Sample Types: Serum
  3. Serum Biomarkers of Myocardial Remodeling and Coronary Dysfunction in Early Stages of Hypertrophic Cardiomyopathy in the Young
    Authors: E Fernlund, T Gyllenhamm, R Jablonowsk, M Carlsson, A Larsson, J Ärnlöv, P Liuba
    Pediatr Cardiol, 2017;0(0):.
    Species: Human
    Sample Types: Serum
  4. Evaluating the diagnostic and prognostic value of circulating cathepsin S in gastric cancer
    Oncotarget, 2016;7(19):28124-38.
    Species: Human
    Sample Types: Serum
  5. Plasma Cathepsin S and Cathepsin S/Cystatin C Ratios Are Potential Biomarkers for COPD
    Dis. Markers, 2016;2016(0):4093870.
    Species: Human
    Sample Types: Plasma
  6. Plasma signature of neurological disease in the monogenetic disorder Niemann-Pick Type C.
    Authors: Alam M, Getz M, Yi S, Kurkewich J, Safeukui I, Haldar K
    J Biol Chem, 2014;289(12):8051-66.
    Species: Mouse
    Sample Types: Plasma
  7. Plasma cathepsin S and cystatin C levels and risk of abdominal aortic aneurysm: a randomized population-based study.
    Authors: Lv B, Lindholt J, Cheng X, Wang J, Shi G
    PLoS ONE, 2012;7(7):e41813.
    Species: Human
    Sample Types: Plasma
  8. Serum cathepsin S is associated with serum C-reactive protein and interleukin-6 independently of obesity in elderly men.
    Authors: Jobs E, Riserus U, Ingelsson E, Helmersson J, Nerpin E, Jobs M, Sundstrom J, Lind L, Larsson A, Basu S, Arnlov J
    J. Clin. Endocrinol. Metab., 2010;95(9):4460-4.
    Species: Human
    Sample Types: Serum

FAQs

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Human Total Cathepsin S DuoSet ELISA
By Lucy Quach on 06/06/2018
Sample Tested: Cell culture supernatant,Cell Lysates