Interleukin-21 (IL-21), Human

Hersteller GenScript
Kategorie
Typ Proteins
Specific against Human
Menge 1mg 
ArtNr Z02715-1
Eclass 6.1 34160400
Eclass 9.0 42020190
Lieferbar
Product Line
Cytokine, Chemokines & Growth Factors
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 gamma chain (gammac) 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.
M.W.
Approximately 15.4 kDa, a single non-glycosylated polypeptide chain containing 133 amino acids.
Purity
>97% by SDS-PAGE and HPLC analyses.
Endotoxin Level
Less than 0.002 EU/ug of rHuIL-21 as determined by LAL method.
Specific Activity
Fully biologically active when compared to standard. The ED50 determined by a cell proliferation assay using human peripheral blood mononuclear cells is less than 10 ng/ml, corresponding to a specific activity of 1.0 x 105 IU/mg.
Storage
This lyophilized preparation is stable at 2-8 C, but should be kept at -20 C for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8 C. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20 C to -70 C. Avoid repeated freeze/thaw cycles.
Formulation
Lyophilized from a 0.2um filtered concentrated, solution in PBS, pH 7.4.
Reconstitution
We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1% BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at < -20 C. Further dilutions should be made in appropriate buffered solutions.
Physical Appearance
Sterile Filtered White lyophilized (freeze-dried) powder.
Usage
This material is for research, laboratory or further evaluation purposes. NOT FOR HUMAN USE.
Sequence
MQDRHMIRMR QLIDIVDQLK NYVNDLVPEF LPAPEDVETN CEWSAFSCFQ KAQLKSANTG NNERIINVSI KKLKRKPPST NAGRRQKHRL TCPSCDSYEK KPPKEFLERF KSLLQKMIHQ HLSSRTHGSE DS
Menge: 1mg 
Lieferbar: In stock
Listenpreis: 4.201,00 €
Preis: 4.201,00 €
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