• Species Reactivity

  Human

• Specificity

  Detects human IL-28 R alpha in direct ELISAs and Western blots. In direct ELISAs, approximately 5% cross-reactivity with recombinant mouse    
  IL‑28 R alpha is observed.

• Source

  Polyclonal Sheep IgG

• Purification

  Antigen Affinity-purified

• Immunogen

  Mouse myeloma cell line NS0-derived recombinant human IL-28 R alpha /IFN-lambda R1    
  Arg21-Ala228    
  Accession # Q8IU57

• Formulation

  Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.

• Label

  Unconjugated

Applications

• Recommended    
  Concentration

  Sample

• Western Blot

  2 µg/mL

  See below

• 
  

• Flow Cytometry

  2.5 µg/10    ⁶ cells

  See below

• 
  

• CyTOF-ready

  Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.

• 
  

Please Note: Optimal dilutions should be determined by each laboratory for each application.  are available in the Technical Information section on our website.

Data Examples

Preparation and Storage

• Reconstitution

  Reconstitute at 0.2 mg/mL in sterile PBS.

• Shipping

  The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C

• Stability & Storage

  Use a manual defrost freezer and avoid repeated freeze-thaw cycles.    

• 12 months from date of receipt, -20 to -70 °C as supplied.

• 1 month, 2 to 8 °C under sterile conditions after reconstitution.

• 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: IL-28 R alpha/IFN-lambda R1

IL-28 R alpha (IL-28 receptor alpha subunit; also named interferon-lambda R1) is a type I transmembrane glycoprotein that is the cytokine receptor family 2 member 12
(CRF2-12) (1-4). It pairs with the IL-10 receptor beta subunit (IL-10 R beta, CRF2-4) to form the IL-28 R (1-4). Each subunit of this receptor can interact with the
interferon-like cytokines (type III interferons) IL-28A (IFN-lambda 2), IL-28B (IFN-lambda 3) or IL-29 (IFN-lambda 1) (1-4). Human IL-28 R alpha cDNA encodes a 520 amino acid (aa) protein with a 20 aa signal peptide, a 208 aa extracellular domain (ECD) with a fibronectin type III motif and four potential N-glycosylation sites, a 21 aa transmembrane sequence, and a proline-rich and acidic 271 aa cytoplasmic domain. Eight isoforms have been sequenced, but their significance is unknown (3, 5). Isoforms of 211 and 244 aa appear to lack transmembrane sequences. These and other isoforms of 491, 437, 322, 283 and 184 aa have alternate N- or C-termini, or lack an internal sequence (aa 268-296). The mature human IL-28 R alpha ECD shares 67%, 66%, 78% and 74% aa sequence identity with mouse, rat, canine and bovine IL-28 R alpha, respectively. Some cross-species reactivity has been shown (6). IL-28 R is constitutively expressed in most tissues, but its ligands are mainly produced by antigen presenting cells in response to viruses and their products (2-6). Signaling through IL-28 R alpha is similar to that of receptors for type I IFNs, including tyrosine phosphorylation, activation of JAK tyrosine kinases, STAT phosphorylation and formation of the IFN-stimulated gene factor 3 (ISGF-3) transcription factor complex
(1-7). This signaling pathway induces antiviral activity and up-regulates MHC class I antigen expression (2-7). Anti-proliferative activity has also been shown for
IL-28/IL-28 R (7).

• References:

1. Chen, Q. et al. (2006) Vitam. Horm. 74:207.

2. Meager, A. et al. (2005) Cytokine 31:109.

3. Sheppard, P. et al. (2003) Nat. Immunol. 4:63.

4. Kotenko, S.V. et al. (2003) Nat. Immunol. 4:69.

5. Entrez Accession # NP_775088, EAW95113, EAW95115, EAW95116, AAI39723, AAI01409.

6. Lasfar, A. et al. (2006) Cancer Res. 66:4468.

7. Dumoutier, L. et al. (2004) J. Biol. Chem. 279:32269.

• Long Name:

  Interleukin 28 Receptor alpha

• Entrez Gene IDs:

  163702 (Human); 242700 (Mouse); 362628 (Rat)

• Alternate Names:

  class II cytokine receptor CRF2/12; CRF2/12; CRF2-12; Cytokine receptor class-II member 12; Cytokine receptor family 2 member 12; IFN-lambda R1; IFN-lambda receptor 1; IFN-lambda-R1; IFNLR; IFNLR1; IL-28 R alpha; IL-28 receptor subunit alpha; IL28R alpha; IL-28R1; IL28RA; IL-28Ra; IL-28R-alpha; Interferon lambda receptor 1; interferon lambda, receptor 1; interleukin 28 receptor A; interleukin 28 receptor, alpha (interferon, lambda receptor); interleukin 28 receptor, alpha; interleukin or cytokine receptor 2; interleukin-28 receptor subunit alpha; LICR2; Likely interleukin or cytokine receptor 2