Feline IL-12/IL-23 p40 Biotinylated Antibody

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Product Details
Supplemental Products

Feline IL-12/IL-23 p40 Biotinylated Antibody Summary

Species Reactivity
Detects feline IL-12/IL-23 p40 in ELISAs and Western blots. In sandwich immunoassays, approximately 65% cross-reactivity with recombinant canine IL-12/IL-23 p40 is observed, less than 3% cross-reactivity with recombinant mouse IL-12/IL-23 p40 is observed, and less than 0.2% cross-reactivity with recombinant human IL-12/IL-23 p40 is observed.
Polyclonal Goat IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant feline IL-12/IL-12 p40
Ile23-Ser329 (Glu167Gly)
Accession # O02744
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 Feline IL-12/IL-23 p40 (Catalog # 2117-FL)

Feline IL-12/IL-23 p40 Sandwich Immunoassay

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

Use in combination with:

Capture Reagent: Feline IL‑12/IL‑23 p40 Antibody (Catalog # AF1954)

Standard: Recombinant Feline IL-12/IL-23 p40 Protein (Catalog # 2117-FL)

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-12/IL-23 p40

Interleukin 12 (IL-12) and IL-23 are secreted heterodimeric glycoproteins belonging to the IL-12 cytokine family. The two cytokines share a common p40 (40 kDa) subunit, which is disulfide-linked with the p35 (35 kDa) subunit in IL-12, and with the p19 (19 kDa) subunit in IL-23. Feline p40 is synthesized as a 329 amino acid (aa) precursor with a 22 aa signal sequence and a 307 aa mature region. It contains a 90 aa fibronectin type III domain and a 75 aa Ig C2-like region. The expression of p40 is induced by substances such as LPS and CpG that activate antigen-presenting cells. Besides being found as a component of IL-12 or IL-23, free p40 monomers and homodimers are also secreted by cells expressing p40. Feline p40 shares 94%, 85%, 84%, 65%, and 65% aa sequence identity with canine, human, porcine, rat and mouse p40, respectively. Cells known to express p40 include macrophages, dendritic cells, monocytes, Langerhans cells, neutrophils, keratinocytes, plasmacytoid dendritic cells, and microglia. From cells that express both the p35 and p40 subunits (dendritic cells, monocytes, and CHO cells), the amount of free p40 secreted is 10 - 1000 fold more than the heterodimeric IL-12. The high-affinity IL-12 receptor complex that transduces IL-12 signals is composed of a 100 kDa ligand-binding subunit (IL-12 R beta 1) and a 130-kDa signal transducing subunit (IL-12 R beta 2). Similarly, the high-affinity IL-23 signaling receptor complex is composed of the shared IL-12 R beta 1 and the unique IL-23 R, a novel gp130-like protein. Both the monomeric and the dimeric free p40 can bind to the IL-12 R beta 1 and function as antagonists of IL-12 or IL-23. However, the monomeric p40 binds IL-12 R beta 1 with lower affinity and is less potent as an IL-12 antagonist. Homodimeric mouse p40 has also been shown to have agonistic functions similar to IL-12, inducing nitric oxide expression and NF kappa B activation in mouse primary microglia and peritoneal macrophages. The molecular mechanism for the agonistic effects of homodimeric p40 has not been determined (1 - 6).

  1. Buttner, M. et al. (1997) Cytokine 10:241.
  2. Park, A.Y. and P. Scott (2001) Scand. J. Immunol. 53:529. 
  3. Trinchieri, G. et al. (2003) Immunity 19:641. 
  4. Brombacher, F. et al. (2003) Trends Immunol. 24:207.
  5. Lankford, C.S. and D.M. Frucht, 2003, J. Leukoc. Biol. 73:49.
  6. Abdi, K. (2002) Scand. J. Immunol. 5:1.
Long Name
Interleukin 12/Interleukin 23 p40
Entrez Gene IDs
3593 (Human); 16160 (Mouse); 64546 (Rat); 397076 (Porcine); 403976 (Canine); 102124858 (Cynomolgus Monkey); 493741 (Feline); 694747 (Rhesus Macaque)
Alternate Names
CLMF p40; CLMF; CLMF2; Cytotoxic lymphocyte maturation factor 40 kDa subunit; IL12 p40; IL-12 p40; IL-12 subunit p40; IL12B; IL-12B; IL-12BNK cell stimulatory factor chain 2; interleukin 12, p40; interleukin 12B (natural killer cell stimulatory factor 2, cytotoxic lymphocytematuration factor 2, p40); interleukin-12 beta chain; interleukin-12 subunit beta; natural killer cell stimulatory factor, 40 kD subunit; NKSF; NKSF2; NKSF2IL12, subunit p40

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