Interleukin-12 (IL-12) is, when biologically active, a heterodimer (p70) consisting of two covalently linked subunits, p35 and p40. IL-12 is produced by antigen-presenting cells, specifically dendritic cells and macrophages. IL-12 is a proinflammatory cytokine that promotes Th1-type responses by inducing IFN-γ production and enhancing proliferation and cytotoxicity of NK and T cells.
Interleukin-23 (IL-23) is a disulfide-linked heterodimer which consists of a unique p19 subunit and the p40 subunit of IL-12. IL-23 is a proinflammatory cytokine, which is produced by macrophages and dendritic cells upon infections with certain pathogens. The IL-23 receptor is expressed on Th17 cells and IL-23 is responsible for Th17 expansion and stabilization.
Since both IL-12 and IL-23 heterodimers comprise the p40 subunit, capture immunoassays based on antibodies to p40 will detect both cytokines. Such assays can also detect p40 monomers and dimers.
Mabtech’s enzyme-linked immunosorbent assay, ELISA PRO, is a complete kit for the quantification of mouse IL-12 and IL-23 in biological fluids such as serum, plasma and cell culture supernatants. The assay utilizes ELISA strip plates precoated with a capture monoclonal antibody (mAb), a biotinylated mAb for detection, streptavidin-horseradish peroxidase (SA-HRP), TMB substrate, a recombinant IL-12 standard (p70 heterodimer), buffers, diluents, stop solution and adhesive plate covers.
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