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Chimerigen
IL-21 (human) (rec.) (untagged)
280
CHF
CHF 280.00
In stock
CHI-HR-20621-C01010 µgCHF 280.00
CHI-HR-20621-C05050 µgCHF 770.00
| Product Details | |
|---|---|
| Synonyms | Interleukin-21 |
| Product Type | Protein |
| Properties | |
| Source/Host | E. coli |
| Sequence |
Human IL-21 (aa 23-155) with a N-terminal Met. |
| Crossreactivity | Human |
| Biological Activity |
Measured by its ability to induce interferon-γ secretion by human natural killer lymphoma NK-92 cells. The ED50 for this effect is 0.4-2ng/ml. |
| MW | ~17kDa (SDS-PAGE) |
| Purity | ≥95% (SDS-PAGE) |
| Endotoxin Content | <0.01EU/μg protein (LAL test; Lonza). |
| Reconstitution |
Reconstitute 10µg vial with 100 µl sterile water to a concentration of 0.1mg/ml. Reconstitute 50µg vial with 100 µl sterile water to a concentration of 0.5mg/ml. Further dilute in other aqueous solutions. |
| Formulation | Lyophilized from 0.2μm-filtered solution in PBS. |
| Other Product Data |
NCBI reference Q9HBE4-1: IL-21 (human) |
| Declaration | Manufactured by Chimerigen. |
| Shipping and Handling | |
| Shipping | BLUE ICE |
| Short Term Storage | +4°C |
| Long Term Storage | -80°C |
| Handling Advice |
Avoid freeze/thaw cycles. Centrifuge lyophilized vial before opening and reconstitution. PBS containing at least 0.1% BSA should be used for further dilutions. |
| Use/Stability |
Stable for at least 1 year after receipt when stored at -80°C. Working aliquots are stable for up to 3 months when stored at -20°C. |
| Documents | |
| MSDS | Inquire |
| Product Specification Sheet | |
| Datasheet |
 Download PDF |
Description
Interleukin-21 (IL-21) is a key factor in the transition between innate and adaptive immune responses secreted by activated T cells. The IL-21 receptor (IL-21R) is expressed in lymphoid tissue, in particular by NK, B, T and dendritic cells, macrophages and endothelial cells. Recent evidence suggests that IL-21 plays a supportive role in the proliferation of T and B cells and influences the cytolytic activity of natural killer cells. IL-21 has been shown to up-regulate genes associated with innate immunity and to inhibit the differentiation of naïve T helper cells. IL-21 specifically inhibits IFN-γ production from developing TH1 cells and is preferentially expressed by TH2 cells. Furthermore IL-21 has been identified as a growth and survival factor for human myeloma cells. IL-21/IL-21R interactions have a unique role in sequentially activating both innate and adaptive immune responses against poorly immunogenic tumors, leading to tumor rejection that is perforin dependent but IFN-γ independent.
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