Invitrogen™ eBioscience™ Human IL-21 ELISA Ready-SET-Go!™ Kit, 2nd Generation
Specifically engineered for accurate and precise measurement of IL-21 protein levels from samples including serum, plasma, and cell culture supernatants. This second generation kit has increased sensitivity with a range from 8-1000pg/mL.
Manufacturer: Invitrogen™ LS88821822
DescriptionIL-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.
|Colorimetric Microplate Reader|
|Plasma, Serum, Supernatants|
|1 hr 45 min|
|Capture Antibody: Pre-titrated; purified antibody, Detection Antibody: Pre-titrated; biotin-conjugated antibody, Standard: Recombinant protein for generating standard curve and calibrating samples, Coating Buffer: 10X PBS ELISA Coating Buffer, Assay Diluent: 5X Concentrated, Detection Enzyme: Pre-titrated Avidin-HRP, Substrate Solution: Tetramethylbenzidine (TMB) Solution, Certificate of Analysis: Lot-specific instructions for dilution of antibodies and standards., 96-well Plates: Corning Costar flat-bottom plates (included with Cat. Nos. ending in -22 and -86)|
|2 x 96 tests|
|Plasma (100μL), Serum (100μL), Supernatants (100μL)|
|24 hr 30 min|
For Research Use Only