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Recombinant Human IL-12/IL-23 (p40) (ELISA Std.)

Pricing & Availability
Regulatory Status
RUO
Other Names
Interleukin-12 p40, Natural killer cell stimulatory factor (NKSF), T-cell stimulating factor (TSF)
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572109 4 pack $94
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Description

Bioactive IL-12 is a potent regulator of cell-mediated immune responses and key mediator of Th1 cell development. Bioactive IL-12 is secreted by activated B lymphocytes, dendritic cells and macrophages as a 70 kD heterodimeric glycoprotein comprised of disulfide-bonded 35 kD and 40 kD subunits. The p40 protein is also a subunit of IL-23 (p60). The disulfide-linked p40 homodimer can bind to IL-12 receptors and antagonize the activities of bioactive IL-12. IL-12 p40 monomer is secreted in vast excess of IL-12 p70 heterodimer; IL-12 p40 monomer has no activity and is antagonistic to IL-12 p70 with only 1/10th the activity of p40 homodimer. Recombinant human IL-12 p40 monomer contains 306 amino acids.

Cytokine detection

IL-12, IL-23 and IL-35 share common subunits, utilizing combinations of p40, p19 and p35 proteins. Caution must be used when selecting antibodies and assays when specific identification, measurement, as well as activation state discrimination, is required.

1. Active IL-12 consists of two subunits: p40 + p35.
2. p40 can also exist as a monomer (IL-12 p40) or a homodimer (IL-12 p80).
3. Besides contributing to IL-12, p40 is also found in IL-23, a heterodimer of p40 and p19.
4. Similarly, p35 not only contributes to IL-12, but is also found in the heterodimer IL-35 (p35 and EBI3).

Note that assays using antibodies specific for the p40 subunit will be unable to discriminate between the active IL-12, monomeric p40, dimeric p40, and IL-23; likewise, assays using p35 detection alone will pick up both IL-12 (heterodimer) and IL-35.

Product Details
Technical data sheet

Product Details

Source
CHO cells, approximately 40 kD
Formulation
Lyophilized in sterile-filtered PBS, pH 7.2, containing 1% BSA, 0.09% sodium azide, and protease inhibitors.
Concentration
Lot-specific (to obtain lot-specific concentration and expiration, please enter the lot number in our Certificate of Analysis online tool.)
Storage & Handling
Unopened vials can be stored between 2°C and 8°C until the expiration date. Prior to use, reconstitute the lyophilized powder with 0.2 mL of PBS containing a carrier protein (e.g., 1% BSA, protease free), pH7.4. Re-cap vial, vortex. Allow the reconstituted standard to sit at room temperature for 15 minutes, vortex again to mix completely. The reconstituted standard stock solution can be aliquoted into polypropylene vials and stored at -70°C for up to one month. Do not re-use diluted standards. Avoid repeated freeze/thaw cycles.
Application

ELISA
Recommended Usage

Each lot of this protein is quality control tested by ELISA assay. For use as an ELISA standard, a standard curve comprised of doubling dilutions from 4000 pg/ml to 62.5 pg/ml is suggested. It is recommended that the reagent be titrated for optimal performance for each application.

Application Notes

This IL-12/IL-23 (p40) protein is useful as a standard for a human IL-12/IL-23 (p40) sandwich ELISA, using unlabelled C8.3 antibody (catalog #501702) for capture and biotinylated C8.6 antibody (catalog #508802) for detection.

Antigen Details

Structure
Cytokine; heterodimer with p35 subunit
Bioactivity
Monomeric human IL-12 p40 has little or no IL-12 antagonistic activity.
Cell Sources
Dendritic cells, monocyts/macrophages, B cells, T cells
Cell Targets
T cells, NK cells, PBL
Receptors
IL-12Rβ1 binds p40; dimeric with IL-12Rβ2 binds p35 (CD212)
Biology Area
Immunology, Innate Immunity, Stem Cells
Molecular Family
Cytokines/Chemokines
Antigen References

1. Fitzgerald K, et al. (eds) 2001. The Cytokine Facts Book. Academic Press San Diego.
2. Quesniaux V. 1992. Research Immun. 143:385.
3. Trinchieri G, et al. 1992 Prog Growth Factor Res. 4:355.
4. Trinchieri G, et al. 1993 Immunol Today. 14:335.

Regulation
Downregulated by IL-10; homodimeric p40 antagonistic to functional p70 heterodimer; p40 monomer has no function; p40 subunit in common with IL-23
Gene ID
3593 View all products for this Gene ID
UniProt
View information about IL-12/IL-23 p40 on UniProt.org
Go To Top Version: 4    Revision Date: 01/10/2024

For Research Use Only. Not for diagnostic or therapeutic use.

 

This product is supplied subject to the terms and conditions, including the limited license, located at www.biolegend.com/terms) ("Terms") and may be used only as provided in the Terms. Without limiting the foregoing, BioLegend products may not be used for any Commercial Purpose as defined in the Terms, resold in any form, used in manufacturing, or reverse engineered, sequenced, or otherwise studied or used to learn its design or composition without express written approval of BioLegend. Regardless of the information given in this document, user is solely responsible for determining any license requirements necessary for user’s intended use and assumes all risk and liability arising from use of the product. BioLegend is not responsible for patent infringement or any other risks or liabilities whatsoever resulting from the use of its products.

 

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