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Human Cystatin A ELISA Kit

SKU:
HUFI00692
Product Type:
ELISA Kit
Size:
96 Assays
Uniprot:
P01040
Sensitivity:
0.188ng/ml
Range:
0.313-20ng/ml
ELISA Type:
Sandwich
Synonyms:
CSTA, Cystatin-A, KeRatolinin, Stefin A,, STF1, cystatin A, cystatin AS, Cystatin-AS, STFA, Stefin-A
Reactivity:
Human
Research Area:
Cell Biology
€499
Frequently bought together:

Description

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Human Cystatin A ELISA Kit

The Human Cystatin A ELISA Kit is a powerful tool for measuring levels of cystatin A in human biological samples such as serum, plasma, and cell culture supernatants. This kit offers exceptional sensitivity and specificity, ensuring accurate and consistent results for a variety of research applications.Cystatin A is a key protein involved in regulating cysteine protease activity and plays a crucial role in maintaining cellular homeostasis and preventing excessive tissue damage. Dysregulation of cystatin A has been linked to various diseases including cancer, inflammatory conditions, and neurodegenerative disorders, highlighting its importance as a biomarker in disease research and therapeutic development.

With the Human Cystatin A ELISA Kit, researchers can easily and accurately quantify cystatin A levels in human samples, providing valuable insights into disease mechanisms and potentially identifying new therapeutic targets. Trust in the reliability and precision of this kit for your research needs.

Product Name:Human Cystatin A ELISA Kit
Product Code:HUFI00692
Size:96 Assays
Alias:CSTA, Cystatin-A, KeRatolinin, Stefin A, STF1, cystatin A, cystatin AS, Cystatin-AS, STFA, Stefin-A
Detection method:Sandwich ELISA, Double Antibody
Application:This immunoassay kit allows for the in vitro quantitative determination of Human CSTA concentrations in serum plasma and other biological fluids.
Sensitivity:0.188ng/ml
Range:0.313-20ng/ml
Storage:4°C for 6 months
Note:For Research Use Only
Recovery:Matrices listed below were spiked with certain level of Human CSTA and the recovery rates were calculated by comparing the measured value to the expected amount of Human CSTA in samples.
MatrixRecovery range(%)Average(%)
serum(n=5)85-9690
EDTA plasma(n=5)90-10496
UFH plasma(n=5)89-10393
Linearity:The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Human CSTA and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
Sample1:21:41:8
serum(n=5)87-105%90-104%87-104%
EDTA plasma(n=5)89-100%84-101%87-101%
UFH plasma(n=5)80-97%80-99%80-94%
CV(%):Intra-Assay: CV<8%
Inter-Assay: CV<10%
ComponentQuantityStorage
ELISA Microplate (Dismountable)8×12 strips4°C for 6 months
Lyophilized Standard24°C/-20°C
Sample/Standard Dilution Buffer20ml4°C
Biotin-labeled Antibody(Concentrated)120ul4°C (Protect from light)
Antibody Dilution Buffer10ml4°C
HRP-Streptavidin Conjugate(SABC)120ul4°C (Protect from light)
SABC Dilution Buffer10ml4°C
TMB Substrate10ml4°C (Protect from light)
Stop Solution10ml4°C
Wash Buffer(25X)30ml4°C
Plate Sealer5-

Other materials and equipment required:

  • Microplate reader with 450 nm wavelength filter
  • Multichannel Pipette, Pipette, microcentrifuge tubes and disposable pipette tips
  • Incubator
  • Deionized or distilled water
  • Absorbent paper
  • Buffer resevoir
UniprotP01040
UniProt Protein Function:CSTA: This is an intracellular thiol proteinase inhibitor. Has an important role in desmosome-mediated cell-cell adhesion in the lower levels of the epidermis. Defects in CSTA are the cause of ichthyosis exfoliative autosomal recessive ichthyosis bullosa of Siemens-like (AREI). A form of congenital exfoliative ichthyosis, sharing some features with ichthyosis bullosa of Siemens and annular epidermolytic ichthyosis. AREI presents shortly after birth as dry, scaly skin over most of the body with coarse peeling of non- erythematous skin on the palms and soles, which is exacerbated by excessive moisture and minor trauma. Electron microscopy analysis of skin biopsies, reveals mostly normal-appearing upper layers of the epidermis, but prominent intercellular edema of the basal and suprabasal cell layers with aggregates of tonofilaments in the basal keratinocytes. Belongs to the cystatin family.
UniProt Protein Details:Chromosomal Location of Human Ortholog: 3q21

Cellular Component: cornified envelope; cytoplasm; extracellular space; nucleus

Molecular Function:cysteine protease inhibitor activity; protease binding; protein binding, bridging; structural molecule activity

Biological Process: cell-cell adhesion; keratinocyte differentiation; negative regulation of peptidase activity; negative regulation of proteolysis; peptide cross-linking

Disease: Exfoliative Ichthyosis, Autosomal Recessive, Ichthyosis Bullosa Of Siemens-like

NCBI Summary:The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins, and kininogens. This gene encodes a stefin that functions as a cysteine protease inhibitor, forming tight complexes with papain and the cathepsins B, H, and L. The protein is one of the precursor proteins of cornified cell envelope in keratinocytes and plays a role in epidermal development and maintenance. Stefins have been proposed as prognostic and diagnostic tools for cancer. [provided by RefSeq, Jul 2008]
UniProt Code:P01040
NCBI GenInfo Identifier:118177
NCBI Gene ID:1475
NCBI Accession:P01040.1
UniProt Secondary Accession:P01040,Q6IB90,
UniProt Related Accession:P01040
Molecular Weight:11,006 Da
NCBI Full Name:Cystatin-A
NCBI Synonym Full Names:cystatin A
NCBI Official Symbol:CSTA  
NCBI Official Synonym Symbols:AREI; PSS4; STF1; STFA  
NCBI Protein Information:cystatin-A
UniProt Protein Name:Cystatin-A
UniProt Synonym Protein Names:Cystatin-AS; Stefin-A
Protein Family:Cystatin
UniProt Gene Name:CSTA  
UniProt Entry Name:CYTA_HUMAN

*Note: Protocols are specific to each batch/lot. For the correct instructions please follow the protocol included in your kit.

Before adding to wells, equilibrate the SABC working solution and TMB substrate for at least 30 min at 37°C. When diluting samples and reagents, they must be mixed completely and evenly. It is recommended to plot a standard curve for each test.

StepProtocol
1.Set standard, test sample and control (zero) wells on the pre-coated plate respectively, and then, record their positions. It is recommended to measure each standard and sample in duplicate. Wash plate 2 times before adding standard, sample and control (zero) wells!
2.Aliquot 0.1ml standard solutions into the standard wells.
3.Add 0.1 ml of Sample / Standard dilution buffer into the control (zero) well.
4.Add 0.1 ml of properly diluted sample ( Human serum, plasma, tissue homogenates and other biological fluids.) into test sample wells.
5.Seal the plate with a cover and incubate at 37 °C for 90 min.
6.Remove the cover and discard the plate content, clap the plate on the absorbent filter papers or other absorbent material. Do NOT let the wells completely dry at any time. Wash plate X2.
7.Add 0.1 ml of Biotin- detection antibody working solution into the above wells (standard, test sample & zero wells). Add the solution at the bottom of each well without touching the side wall.
8.Seal the plate with a cover and incubate at 37°C for 60 min.
9.Remove the cover, and wash plate 3 times with Wash buffer. Let wash buffer rest in wells for 1 min between each wash.
10.Add 0.1 ml of SABC working solution into each well, cover the plate and incubate at 37°C for 30 min.
11.Remove the cover and wash plate 5 times with Wash buffer, and each time let the wash buffer stay in the wells for 1-2 min.
12.Add 90 µl of TMB substrate into each well, cover the plate and incubate at 37°C in dark within 10-20 min. (Note: This incubation time is for reference use only, the optimal time should be determined by end user.) And the shades of blue can be seen in the first 3-4 wells (with most concentrated standard solutions), the other wells show no obvious color.
13.Add 50 µl of Stop solution into each well and mix thoroughly. The color changes into yellow immediately.
14. Read the O.D. absorbance at 450 nm in a microplate reader immediately after adding the stop solution.

When carrying out an ELISA assay it is important to prepare your samples in order to achieve the best possible results. Below we have a list of procedures for the preparation of samples for different sample types.

Sample TypeProtocol
SerumIf using serum separator tubes, allow samples to clot for 30 minutes at room temperature. Centrifuge for 10 minutes at 1,000x g. Collect the serum fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles.

If serum separator tubes are not being used, allow samples to clot overnight at 2-8°C. Centrifuge for 10 minutes at 1,000x g. Remove serum and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles.

PlasmaCollect plasma using EDTA or heparin as an anticoagulant. Centrifuge samples at 4°C for 15 mins at 1000 × g within 30 mins of collection. Collect the plasma fraction and assay promptly or aliquot and store the samples at -80°C. Avoid multiple freeze-thaw cycles. Note: Over haemolysed samples are not suitable for use with this kit.
Urine & Cerebrospinal FluidCollect the urine (mid-stream) in a sterile container, centrifuge for 20 mins at 2000-3000 rpm. Remove supernatant and assay immediately. If any precipitation is detected, repeat the centrifugation step. A similar protocol can be used for cerebrospinal fluid.
Cell culture supernatantCollect the cell culture media by pipette, followed by centrifugation at 4°C for 20 mins at 1500 rpm. Collect the clear supernatant and assay immediately.
Cell lysatesSolubilize cells in lysis buffer and allow to sit on ice for 30 minutes. Centrifuge tubes at 14,000 x g for 5 minutes to remove insoluble material. Aliquot the supernatant into a new tube and discard the remaining whole cell extract. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Tissue homogenatesThe preparation of tissue homogenates will vary depending upon tissue type. Rinse tissue with 1X PBS to remove excess blood & homogenize in 20ml of 1X PBS (including protease inhibitors) and store overnight at ≤ -20°C. Two freeze-thaw cycles are required to break the cell membranes. To further disrupt the cell membranes you can sonicate the samples. Centrifuge homogenates for 5 mins at 5000xg. Remove the supernatant and assay immediately or aliquot and store at -20°C or -80°C.
Tissue lysatesRinse tissue with PBS, cut into 1-2 mm pieces, and homogenize with a tissue homogenizer in PBS. Add an equal volume of RIPA buffer containing protease inhibitors and lyse tissues at room temperature for 30 minutes with gentle agitation. Centrifuge to remove debris. Quantify total protein concentration using a total protein assay. Assay immediately or aliquot and store at ≤ -20 °C.
Breast MilkCollect milk samples and centrifuge at 10,000 x g for 60 min at 4°C. Aliquot the supernatant and assay. For long term use, store samples at -80°C. Minimize freeze/thaw cycles.

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