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Invitrogen
Basic Human IL-21 ELISA Kit
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Product Specifications
Analytical sensitivity
20 pg/mL
Assay range
78-5,000 pg/mL
Sample type/volume
Plasma
50 µL
Supernatant
50 µL
Serum
50 µL
Hands-on time
1 hr 20 min
Time-to-result
4 hr 10 min
Homogenous (no wash)
No
Instrument
Absorbance Microplate Reader
Product size
96 Tests
Contents
Pre-coated 96 well plate
Standard
Sample Diluent
Assay Buffer concentrate
Biotinylated Detection Antibody
SAV-HRP
Wash Buffer
Chromogen
Stop Solution
Adhesive Plate Covers
Standard
Sample Diluent
Assay Buffer concentrate
Biotinylated Detection Antibody
SAV-HRP
Wash Buffer
Chromogen
Stop Solution
Adhesive Plate Covers
Shipping conditions
Wet ice
Storage
2-8°C
Protein name
IL-21
Species (tested)
Human
Assay kit format
Sandwich ELISA Kit
Detector antibody conjugate
Biotin
Label or dye
HRP
About This Kit
Kit Overview
The Human IL-21 ELISA kit enables the quantification of Human IL-21 in various biological samples, including human serum, plasma, buffered solutions, and cell culture medium. This assay is specifically designed to exclusively detect both natural and recombinant forms of Human IL-21.
Principle of the assay
The Human IL-21 solid-phase sandwich ELISA (enzyme-linked immunosorbent assay) follows a unique approach to measure the amount of the target molecule. It utilizes a matched pair of antibodies to capture the target and form a sandwich complex. The first antibody is pre-coated on the microplate wells, where samples, standards, or controls are added and bind to the immobilized antibody. The second antibody, acting as the detector, is then introduced, followed by the addition of a substrate solution that generates a measurable signal upon interaction with the enzyme-antibody-target complex. The intensity of this signal directly correlates to the concentration of the target present in the original specimen.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
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.
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Bioinformatics
Gene aliases : CVID11, IL-21, IL21, Za11
Gene ID : (Human) 59067
Gene symbol : IL21
Protein Aliases : CX2, il 21, ILN, Interleukin, Interleukin21, IL-21, Interleukin-21, interleukin-21 isoform, Za11
UniProt ID (Human) Q9HBE4
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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