Interferon lambda-2, also known as Interleukin 28A, is an antiviral cytokine with immunomodulatory activity and is distantly related to the IL10 family and type I interferons. IL28A along with IL29 and IL28B, are three closely related cytokines that form a cytokine gene cluster that use a distinct receptor system which induces antiviral defence signals. IL28A interacts with a heterodimeric class II cytokine receptor ligand and leads to the activation of the JAK/STAT signalling pathway, which ultimately leads to IFN-stimulated gene (ISG) and MHC class I antigen expression. It also plays a key role in antiviral defence in Toll-like receptors (TLR) and intestinal epithelia. Recominant Human IL28A isexpressed in human 293 cells as a non-glycosylated monomer with a molecular mass of 24 kDa.
Alternative Names
Interleukin-28A ; Interferon lambda-2 ; Zcyto20
Quantity
100 µg
Regulatory
RUO
Source
HEK293
Host
Human
Endotoxin Level
<1 EU/µg of recombinant protein as determined by the LAL method
Biological Activity Comment
The EC(50) as determined by the dose-dependent protection of the cytopathic effect on A549 cells (human lung adenocarcinoma epithelial cell line) that were challenged with encephalomyocarditis (EMC) virus was found to be ≤5 ng/mL.
Weight
24 kDa, monomer, non-glycosylated
Description
A quick spin of the vial followed by reconstitution in sterile 1xPBS containing 0.1% endotoxin-free recombinant human serum albumin (HSA).
Format
Lyophilized Powder1x PBS
Purity
>95% as determined by SDS-PAGE
Storage
The lyophilized protein is stable for at least one year from date of receipt at -70°C. Upon reconstitution, this cytokine can be stored in working aliquots at 2° - 8°C for one month, or at -20°C for six months. Avoid repeated freeze/thaw cycles.