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Human IL-21 Recombinant Protein
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Product Details
PHC0211
Product Specifications
Species
Human
Expression System
E. coli
Amino acid sequence
QDRHMIRMRQ LIDIVDQLKN YVNDLVPEFL PAPEDVETNC EWSAFSCFQK AQLKSANTGN NERIINVSIK KLKRKPPSTN AGRRQKHRLT CPSCDSYEKK PPKEFLERFK SLLQKMIHQH LSSRTHGSED S
Molecular weight
15 kDa
Class
Recombinant
Type
Protein
Purity
>95% by SDS-PAGE
Endotoxin concentration
<0.1 ng/µg
Activity
ED50 = 1 - 5 ng/mL; determined by the dose-dependent secretion of IFN-gamma by human NK-92 natural killer lymphoma cells.
Conjugate
Form
Lyophilized
Amount
100 µg
Purification
purified
Contains
no preservative
Storage conditions
4°C
Shipping conditions
Wet ice (domestic); Wet or Dry ice (international)
Product Specific Information
Carrier-Free
Reconstitution: We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute lyophilized recombinant human IL-21 in sterile, distilled water to a concentration of 0.1-1.0 mg/mL. Further dilutions should be made in low endotoxin medium or a buffered solution containing a carrier protein such as heat inactivated FCS or tissue culture grade BSA. Storage: Store lyophilized recombinant human IL-21 at 2°C to 8°C, preferably desiccated. Upon reconstitution, apportion into working aliquots and store at ≤-20°C. Avoid repeated freeze/thaw cycles.
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
Protein Aliases: CX2; four helix bundle cytokine; il 21; IL-21; ILN; Interleukin; Interleukin-21; Interleukin21; Za11
Gene Aliases: CVID11; IL-21; IL21; Za11
UniProt ID: (Human) Q9HBE4
Entrez Gene ID: (Human) 59067
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