Equine IL-1ra/IL-1F3 Biotinylated Antibody

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Equine IL-1ra/IL-1F3 Biotinylated Antibody Summary

Species Reactivity
Detects equine IL-1ra in ELISAs and Western blots. In sandwich ELISAs, approximately 20% cross‑reactivity is observed with rmIL-1ra, less than 5% cross‑reactivity with rrIL-1ra, less than 2% cross‑reactivity with rpIL-1ra, and less than 0.4% cross‑reactivity with rhIL-1ra is observed.
Polyclonal Goat IgG
Antigen Affinity-purified
Recombinant Equine IL‑1ra/IL‑1F3
Accession # O18999.1
Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.


Recommended Concentration
Western Blot
0.1 µg/mL
Recombinant Equine IL‑1ra/IL‑1F3 (Catalog # 2466-RA)

Equine IL-1ra/IL-1F3 Sandwich Immunoassay

Recommended Concentration
ELISA Detection (Matched Antibody Pair)
0.1-0.4 µg/mL 

Use in combination with:

Capture Reagent: Equine IL‑1ra/IL‑1F3 Antibody (Catalog # AF2466)

Standard: Recombinant Equine IL-1ra/IL-1F3 Protein (Catalog # 2466-RA)

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

Reconstitution Calculator

Reconstitution Calculator

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Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
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-1ra/IL-1F3

Secreted equine IL-1 receptor antagonist (IL-1ra) is a presumably 22 - 25 kDa glycoprotein produced by variety of cell types that antagonizes IL-1 activity (1 - 3). It is a member of the IL-1 family of proteins that includes IL-1 alpha and IL-1 beta. Although there is little amino acid (aa) identity (< 30%) among the three IL-1 family members, all molecules bind to the same receptors, all show a beta -trefoil structure, and all are believed to have evolved from a common ancestral gene (1 - 4). Equine IL-1ra is synthesized as a 177 aa precursor that contains a 25 aa signal sequence plus a 152 aa mature region. There is one intrachain disulfide bond and one potential N-linked glycosylation site (3, 5, 6). Mature equine sIL-1ra is 78%, 78%, 80%, 82%, and 76% aa identical to mature mouse, human, porcine, canine and bovine IL-1ra, respectively. In human, three non-secreted IL-1ra isoforms have also been identified. It is unknown if such an analogous situation exists in equine. Cells known to secrete IL-1ra include fibroblasts, vascular smooth muscle cells, intestinal columnar epithelium, chondrocytes, macrophages, mast cells, neutrophils and hepatocytes.

There are two type I transmembrane glycoprotein receptors for IL-1ra. The first is the bioactive 80 kDa type I IL-1 receptor (IL-1 RI), and the second is the inert (decoy) 65 kDa type II IL-1 receptor. IL-1ra binding to IL-1 RI competitively blocks IL-1 ( alpha or beta ) binding to the same receptor. This results in receptor ligation without activation (1, 7). The type II IL-1 receptor is inert, and any binding of IL-1ra not only fails to block co-existing IL-1 activity, but may actually potentiate it by removing an IL-1 antagonist. Functionally, all activities attributed to IL-1ra are explained by its role as a competitive inhibitor of IL-1 binding to IL-1 RI (1, 2, 8, 9).

  1. Arend, W.P. et al. (1998) Annu. Rev. Immunol. 16:27.
  2. Roux-Lombard, P. (1998) Eur. Cytokine Netw. 9:565.
  3. Dayer-J-M. (2002) Clin. Exp. Rheumatol. 20(27):S14.
  4. Eisenberg, S.P. et al. (1991) Proc. Natl. Acad. Sci. USA 88:5232.
  5. Kato, H. et al. (1997) Vet. Immunol. Immunopathol. 56:221.
  6. Howard, R.D. et al. (1998) Am. J. Vet. Res. 59:712.
  7. Dinarello, C.A. (1997) Semin. Oncol. (Suppl 9):S9.
  8. Irikura, V.M. et al. (2002) J. Immunol. 169:393.
  9. Arend, W.P. and C. Gabay (2000) Arth. Res. 2:245.
Long Name
Interleukin 1 Receptor Antagonist
Entrez Gene IDs
3557 (Human); 16181 (Mouse); 60582 (Rat); 397499 (Porcine)
Alternate Names
DIRA; ICIL-1ra; IL1F3; IL-1F3; IL1ra; IL-1ra; IL-1ra3; IL1RN; IL-1RN; interleukin 1 receptor antagonist; IRAP; MVCD4

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