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Invitrogen
Human IL-21 Uncoated ELISA Kit with Plates
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Product Specifications
Analytical sensitivity
8 pg/mL
Assay range
8-1,000 pg/mL
Sample type/volume
Plasma
100 µL
Serum
100 µL
Supernatant
100 µL
Hands-on time
1 hr 45 min
Time-to-result
24 hr 30 min
Homogenous (no wash)
No
Instrument
Absorbance Microplate Reader
Product size
20 x 96 Tests
Contents
Capture Antibody: Pre-titrated, purified antibody
Detection Antibody: Pre-titrated, HRP-conjugated antibody
Standard: Recombinant protein for generating standard curve and calibrating samples
10X Coating Buffer: Buffer for plating the Capture Antibody
5X ELISA/ELISPOT Diluent: Buffer for blocking and diluting the Detection Antibody and Enzyme
Substrate: 1X TMB Solution
Certificate of Analysis: Lot-specific instructions for dilution of antibodies and standards
96 Well Plate: High affinity 96-well plate (included with product Cat. Nos. ending in suffixes -22, -76, -86)
Detection Antibody: Pre-titrated, HRP-conjugated antibody
Standard: Recombinant protein for generating standard curve and calibrating samples
10X Coating Buffer: Buffer for plating the Capture Antibody
5X ELISA/ELISPOT Diluent: Buffer for blocking and diluting the Detection Antibody and Enzyme
Substrate: 1X TMB Solution
Certificate of Analysis: Lot-specific instructions for dilution of antibodies and standards
96 Well Plate: High affinity 96-well plate (included with product Cat. Nos. ending in suffixes -22, -76, -86)
Storage
2-8°C
Protein name
IL-21
Target site-specificity
Assay kit format
Uncoated ELISA Kit with Plates
Detector antibody conjugate
Biotin
Label or dye
HRP
About This Kit
The Human Interleukin 21 (IL-21) Uncoated ELISA Kit contains pre-matched antibody pairs, plates and reagents for performing quantitative enzyme linked immunosorbent assays (ELISA) to detect and quantify protein levels of human IL-21. Wash Buffer and Stop Solution are needed to complete the ELISA reaction and are sold separately.
Principle of the method
ELISAs are designed to measure the amount of the target bound between a matched antibody pair. A target-specific antibody is coated to the bottom of the wells of a microplate, which is an overnight process. Samples, standards, or controls are then added into these wells and bind to the immobilized (capture) antibody. A sandwich is formed by the addition of the second (detector) antibody, a substrate solution is added that reacts with the enzyme-antibody-target complex to produce measurable signal. The intensity of this signal is directly proportional to the concentration of target present in the original specimen.
Target information
IL-21 is a 17 kDa immunomodulatory cytokine produced mainly by Natural Killer Cells (NKT), T helper (Th) 17 and T follicular helper (TFH) cells. In TFH cells, IL-21 expression leads to autocrine signaling through the IL-21 receptor (IL-21R) and STAT3, which leads to additional transcriptional activation by Bcl6. As with IFN gamma for Th1 and IL-4 for Th2 cells, IL-21 is critical for TFH cell development and effector function. IL-21 plays a role in T cell-dependent B cell differentiation into plasma cells and memory cells, stimulation of IgG production and induction of apoptotic signaling in naive B cells. In Th17 cells, IL-21 expression and autocrine feedback through STAT3, IRF4 and ROR gamma t lead to upregulation of the IL-23R, thereby preparing Th17 cells for maturation and maintenance by the inflammatory cytokine IL-23. While upregulating IRF4 and ROR gamma t, IL-21 also mediates the downregulation of Foxp3. IL-21 deficient mice are protected from developing colitis upon chemical treatment by their inability to upregulate Th17-associated molecules. In comparison, elevated levels of IL-21 are present in chemically-induced colitis mouse models.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Bioinformatics
Protein Aliases : IL-21, Za11
Performance Guarantee
If an Invitrogen™ immunoassay doesn't perform as described on our website or datasheet,we'll replace the product at no cost to you, or provide you with a credit for a future purchase.*
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