• Species Reactivity

  Mouse

• Specificity

  Detects mouse IL‑5 R alpha /CD125 in direct ELISAs and Western blots. In direct ELISAs, approximately 10% cross‑reactivity with recombinant human (rh) IL‑5 R alpha is observed and less than 1% cross‑reactivity with recombinant mouse (rm) IL-4 R, rhIL-9 R, rhIL-13 R alpha 1, and rhIL-13 R alpha 2 is observed.

• Source

  Polyclonal Goat IgG

• Purification

  Antigen Affinity-purified

• Immunogen

  Mouse myeloma cell line NS0-derived recombinant mouse IL‑5 R alpha /CD125    
  Asp18-His339    
  Accession # P21183

• 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

  0.1 µg/mL

  Recombinant Mouse IL‑5 R alpha /CD125 Fc Chimera (Catalog # )

• 
  

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

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-5 R alpha/CD125

Interleukin‑5 Receptor alpha (IL‑5 R alpha ), also known as CD125, is a 60 kDa hematopoietin receptor that plays a dominant role in eosinophil biology (1‑3). Mature mouse IL‑5 R alpha consists of a 322 amino acid (aa) extracellular domain (ECD) with a WSxWS motif and a four cysteine motif, a 22 aa transmembrane segment, and a 54 aa cytoplasmic domain (4). Within the ECD, mouse IL‑5 R alpha shares 71% and 86% aa sequence identity with human and rat IL‑5 R alpha, respectively. Alternate splicing of mouse IL‑5 R alpha generates soluble secreted forms which function as IL‑5 antagonists (4, 5). The high affinity receptor for IL‑5 is a complex that consists of the ligand binding IL‑5 R alpha and the transmembrane common  beta chain ( beta c/CD131) which is shared with the receptor complexes for IL‑3 and GM‑CSF (6). IL‑5 R alpha binds IL‑5 at low affinity and then associates with preformed beta c oligomers to form the signaling‑competent receptor complex (7). IL‑5 stimulation of CD34  ⁺ hematopoietic progenitor cells induces the up‑regulation of transmembrane IL‑5 R alpha followed by eosinophilic differentiation and activation (8‑10). IL‑5 R alpha also promotes the differentiation of basophils and B cells (11, 12). Exposure of mature eosinophils to IL‑5 attenuates their IL‑5 responsiveness by inducing the down‑regulation of surface IL‑5 R alpha and increased production of soluble IL‑5 R alpha (13, 14). Elevated production of IL‑5 at sites of allergic inflammation induces eosinophilia and exacerbation of immune cell infiltration, tissue damage, and remodeling (2, 3).

• References:

1. Martinez-Moczygemba, M. and D.P. Huston (2003) J. Allergy Clin. Immunol. 112:653.

2. Rothenberg, M.E. and S.P. Hogan (2005) Annu. Rev. Immunol. 24:147.

3. Elsas, X.P. and M.I.G. Elsas (2007) Curr. Med. Chem. 14:1925.

4. Takaki, S. et al. (1990) EMBO J. 9:4367.

5. Cameron, L. et al. (2000) J. Immunol. 164:1538.

6. Tavernier, J. et al. (1991) Cell 66:1175.

7. Zaks-Zilberman, M. et al. (2008) J. Biol. Chem. 283:13398.

8. Tavernier, J. et al. (2000) Blood 95:1600.

9. Clutterbuck, E.J. et al. (1989) Blood 73:1504.

10. Lopez, A.F. et al. (1988) J. Exp. Med. 167:219.

11. Denburg, J.A. et al. (1991) Blood 77:1462.

12. Hasbold, J. et al. (2004) Nat. Immunol. 5:55.

13. Gregory, B. et al. (2003) J. Immunol. 170:5359.

14. Liu, L.Y. et al. (2002) J. Immunol. 169:6459.

• Long Name:

  Interleukin 5 Receptor alpha

• Entrez Gene IDs:

  3568 (Human); 16192 (Mouse)

• Alternate Names:

  CD125 antigen; CD125; CDw125CD125; HSIL5R3; IL-5 R alpha; IL-5 receptor subunit alpha; IL5R alpha; IL-5R subunit alpha; IL5R; IL5RA; IL-5Ra; IL-5R-alpha; interleukin 5 receptor type 3; interleukin 5 receptor, alpha; interleukin-5 receptor alpha chain; interleukin-5 receptor alpha subunit; interleukin-5 receptor subunit alpha; MGC26560