Name : IL-21, Human

Product Concentration :

Background :
Interleukin-21 (IL-21) belongs to the Type I four helix bundle cytokines, and shares the common cytokine receptor γ chain with IL-2, IL-4, IL-7, IL-9, and IL-15. IL-21 is expressed by CD4+ T cells, natural killer (NK) T cells, and Th17 cells, and the IL-21 receptor is highly expressed on CD4+ and CD8+ B cells; indeed, IL-21 plays a pivotal role in the survival and proliferation of B cells, and their differentiation to immunoglobulin (Ig) producing cells. IL-21 up-regulates and down-regulates the production of IgG1 and IgE by B cells, respectively, and diminishes the severity of allergy and asthma. In some case, IL-21 also induces the apoptosis of B cells. The other roles of IL-21 include regulation of innate immune systems, implication on autoimmunity, and antitumor actions.

Biological Activity :
ED50≤ 3.0 ng/ml, measured by its ability to enhance IFN-gamma secretion in NK-92 human natural killer lymphoma cells.

expression system :
E. coli

Tag :
Expressed with an N-terminal Met. IL-21 (Gln30-Ser162)Accession # Q9HBE4

Protein Accession No. :

Synonyms :
IL21; CVID11; IL-21; Za11; interleukin 21

Molecular Weight :
~15.4 kDa, on SDS-PAGE under reducing conditions.

Purity :
> 95% as analyzed by SDS-PAGE

Product Concentration :
Lyophilized after extensive dialysis against PBS.

Storage and Stability :
Upon receiving, this product remains stable for up to 6 months at lower than -70°C. Upon reconstitution, the product should be stable for up to 1 week at 4°C or up to 3 months at -20°C. For long term storage it is recommended that a carrier protein (example 0.1% BSA) be added. Avoid repeated freeze-thaw cycles.

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites:
Popular product recommendations:
CCL24/Eotaxin-2 Protein
Animal-Free FLT3LG Protein
Popular categories: