Gibco™ Human IL-21 Recombinant Protein

Description

Recombinant Protein

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.

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.

Specifications

• Accession Number: Q9HBE4
• For Use With (Application): Control, ELISA, Functional Assay, Immunohistochemistry, Western Blot
• Formulation: protein with no preservative
• Gene ID (Entrez): 59067
• Molecular Weight (g/mol): 15 kDa
• Name: Human IL-21
• Purification Method: Sequential Chromatography
• Quantity: 25 μg
• Endotoxin Concentration: <0.1 ng/ μg
• Gene Alias: CVID11; C x 2; il 21; IL21; IL-21; ILN; Interleukin; interleukin 21; Interleukin21; interleukin-21; interleukin-21 isoform; porcine interleukin-21; Za11
• Common Name: IL-21
• Biological Activity: ED50 = 1 - 5 ng/mL; determined by the dose-dependent secretion of IFN-gamma by human NK-92 natural killer lymphoma cells.
• Conjugate: Unconjugated
• Species: Human
• Recombinant: Recombinant
• Sequence: QDRHMIRMRQ LIDIVDQLKN YVNDLVPEFL PAPEDVETNC EWSAFSCFQK AQLKSANTGN NERIINVSIK KLKRKPPSTN AGRRQKHRLT CPSCDSYEKK PPKEFLERFK SLLQKMIHQH LSSRTHGSED S
• Content And Storage: 4°C
• Classification: Carrier-Free
• Endotoxin Level: <0.1 ng/μg
• Shipping Condition: Approved for shipment on Wet or Dry Ice
• Expression System: E. coli
• Protein Family: Cytokines & Receptors
• Protein Form: Recombinant, Ligand
• Form: Lyophilized
• Protein Subtype: Interleukins
• Research Category: Immunology, Signal Transduction, Virology, Angiogenesis, Drug Development, Oncology
• Product Line: Gibco™
• Purity or Quality Grade: >95% by SDS-PAGE

Safety and Handling

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