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Animal-Free Recombinant Human IL-21

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Description IL-21 is a pleiotropic cytokine produced by CD4+ T cells in response to antigenic stimulation. Its action generally 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 naïve 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 γ chain (γc) 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. Recombinant human IL-21 is a 15.4 kDa protein consisting of 132 amino acid residues.
BiologicalActivity Assay #1:Determined by its ability to proliferate activated B cells.

Assay #2:Determined by its ability to induce human CD40L-activated naïve B cells to undergo Ig isotype switching to IgG, using an IL-21 concentration of 50 ng/ml. Maximal activity was achieved after approximately five cell divisions.
Avery, D.T. et. al. (2008) J. Immunol. 181, 1767-1779.
Authenticity Verified by N-terminal and Mass Spectrometry analyses (when applicable).
Endotoxin Endotoxin level is <0.1 ng/ µg of protein (<1EU/ µg).
Protein Content Verified by UV Spectroscopy and/or SDS-PAGE gel.
PrecautionsAnimal-Free Recombinant Human IL-21 is for research use only and not for use in diagnostic or therapeutic procedures.
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$ 1,499.00
$ 263.00
Cat# PBG10523
(40 western blots)
Availability: 5-7days
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