Upstream / Downstream


Explore pathways related to this product.


Find answers on our FAQs page.


PhosphoSitePlus® Resource

  • Additional protein information
  • Analytical tools


Source / Purification

Recombinant human IL-28A (hIL-28A) Val26-Val200 (Accession #NP_742150) was expressed in human 293 cells at Cell Signaling Technology.

Product Description


>98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant hIL-28A. All lots are greater than 98% pure.

Molecular Formula:

Based on amino acid sequencing, greater than 60% of recombinant hIL-28A starts at Val26 (VPVAR) and has a calculated MW of 19,754. The remainder starts at Pro27 (PVARL) or Val28 (VARLH). DTT-reduced and non-reduced protein migrate as 21 kDa polypeptides.


The bioactivity of recombinant hIL-28A was determined in a virus protection assay. The ED50 of each lot is between 10-60 ng/ml.


Less than 0.01 ng endotoxin/1 μg hIL-28A.

Product Usage Information


With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 20 μg BSA per 1 μg hIL-28A. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2.

Storage: Stable in lyophilized state at 4°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months and at -20°C for 6 months. Avoid repeated freeze-thaw cycles.Maintain sterility. Storage at -20°C should be in a manual defrost freezer.

IL-28A is a member of the Interferon λ family of cytokines, which includes IL-29 and IL-28B (1). IL-28A is produced by a number of cell types and shares many functions with Type I Interferons (1-3). IL-28A exhibits anti-viral activities in vitro and in vivo (1,2). IL-28A directly inhibits tumor cell proliferation and promotes anti-tumor immune responses in vivo (1,3). The IL-28 receptor is a heterodimer of the IL28-Rα and IL10-RI (1). IL-28A activates Stat1, Stat3, and Stat5 (1). IL-28Rα expression is limited to a few cell types, including plasmacytoid DC and epithelial cells (1).

1.  Li, M. et al. (2009) J Leukoc Biol 86, 23-32.

2.  Ank, N. et al. (2006) J Virol 80, 4501-9.

3.  Numasaki, M. et al. (2007) J Immunol 178, 5086-98.

Entrez-Gene Id 282616
Swiss-Prot Acc. Q8IZJ0

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.

Human Interleukin-28A (hIL-28A/IFN-λ2)