IL-21 Protein

Description:
|Introduction IL-21 is produced by CD4+ T cells in response to antigenic stimulation. Its action enhances antigen-specific responses of immune cells. The biological effects of IL-21 include induction of differentiation of T-cells-stimulated B-cells into plasma cells and memory B-cells, stimulation (in conjuction) with IL-4 of IgG production, and induction of apoptotic effects in na?ve B-cells and stimulated B-cells in the absence of T-cell signaling. Additionally, IL-21 promotes the anti-tumor activity of CD8+ T-cells and NK cells. IL-21 exerts its effect through binding to a specific type I cytokine receptor, IL-21R, which also contains the gamma chain (?) found in other cytokine receptors including IL-2, IL-4, IL-7, IL-9 and IL-15. The IL-21/IL-21R interaction triggers a cascade of events which includes activation of the tyrosine kinases JAK1 and JAK3, followed by activation of the transcription factors STAT1 and STAT3. |Reco|E. coli-derived. A single, non-glycosilated polypeptide chain containing 129 amino acids and having a total molecular mass of 15.2 kDa. The biological activity is measured by its ability to proliferate activated B cells. Purity: > 95.0% as determined by RP-HPLC and SDS-|Rat IL-21 was lyophilized from a 0.2 um filtered concentrated solution in PBS, pH 7.4. Reconstitution: It is recommended to reconstitute the lyophilized Rat IL21 in sterile 18 M?-cm H2O not less than 100 ug/ml, which can then be further diluted to other aqueous solutions. Shipping: The product is shipped at a|Use a manual defrost freezer and avoid repeated freeze-thaw cycles. 12 months from date of receipt, -20 to -70°C as supplied. 1 month, 2 to 8°C under sterile conditions after reconstitution. 3 months, -20 to -70°C under sterile conditions after reconstitution. |Other IL-21 Proteins: Recombinant Mouse IL-21 Recombinant Human IL-21