IL-12 is produced by macrophages and B lymphocytes and has been shown to have multiple effects on T cells and natural killer (NK) cells. These effects include inducing production of IFN-gamma and TNF by resting and activated T and NK cells, synergizing with other IFN-gamma inducers at both the transcriptional and post-transcriptional levels. This interaction induces IFN-gamma gene expression, enhancing the cytotoxic activity of resting NK and T cells, inducing and synergizing with IL-2 in the generation of lymphokine-activated killer (LAK) cells, acting as a co-mitogen to stimulate proliferation of resting T cells, and inducing proliferation of activated T and NK cells. Current evidence indicates that IL‑12, produced by macrophages in response to infectious agents, is a central mediator of the cell‑mediated immune response by its actions on the development, proliferation, and activities of TH1 cells. In its role as the initiator of cell-mediated immunity, it has been suggested that IL-12 has therapeutic potential as a stimulator of cell-mediated immune responses to microbial pathogens, metastatic cancers, and viral infections such as AIDS.
Recombinant Human IL-12 Protein
R&D Systems | Catalog # 219-IL
Bigger Scale, More Savings. Try our NEW version of Human Recombinant IL-12 (10018-IL). Combining R&D Systems quality with scalability that allows for lower price points and a solid supply chain.
Key Product Details
- R&D Systems Sf 21 (baculovirus)-derived Recombinant Human IL-12 Protein (219-IL)
- Quality control testing to verify active proteins with lot specific assays by in-house scientists
- All R&D Systems proteins are covered with a 100% guarantee
Source
Accession Number
Structure / Form
Applications
Product Specifications
Source
| Human IL-12 p40 (Ile23-Ser328) Accession # P29460 |
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| Human IL-12 p35 (Arg23-Ser219) Accession # P29459 |
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| N-terminus | C-terminus |
Purity
Endotoxin Level
N-terminal Sequence Analysis
Predicted Molecular Mass
SDS-PAGE
Activity
The ED50 for this effect is 0.01-0.05 ng/mL.
Reviewed Applications
Read 3 reviews rated 4.7 using 219-IL in the following applications:
Formulation, Preparation, and Storage
Carrier Free
What does CF mean?CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
What formulation is right for me?In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
Carrier: 219-IL
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein. |
| Reconstitution | Reconstitute at 50 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin. |
| Shipping | 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.
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Carrier Free: 219-IL/CF
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute 5 µg vials at 50 µg/mL in sterile PBS. Reconstitute 25 µg or larger vials at 100 µg/mL in sterile PBS. |
| Shipping | 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.
|
Calculators
Background: IL-12
Long Name
Alternate Names
Entrez Gene IDs
Gene Symbol
UniProt
Additional IL-12 Products
Product Documents for Recombinant Human IL-12 Protein
Certificate of Analysis
To download a Certificate of Analysis, please enter a lot or batch number in the search box below.
Note: Certificate of Analysis not available for kit components.
Product Specific Notices for Recombinant Human IL-12 Protein
For research use only
Related Research Areas
Citations for Recombinant Human IL-12 Protein
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Customer Reviews for Recombinant Human IL-12 Protein (3)
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Customer Images
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Application: In vitro bioactivity in cell cultureSpecies: HumanVerified Customer | Posted 04/14/2026IFN-gamma release in lymphocytes after IL-12 stimulationIL-12 induced IFN-gamma release
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Application: Primary immune cell survival signal and stimulationVerified Customer | Posted 08/26/2024We use this cytokine as part of a T cell stimulation protocol designed to enhance CD8+ cytotoxic T cell activity against a tumor.
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Application: Stem/Immune cell maintenance or differentiationVerified Customer | Posted 02/27/2023
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FAQs for Recombinant Human IL-12 Protein
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Q: Human IL-23 and Human IL-12 share a p40 subunit. Why is the predicted molecular weight for the p40 subunit 36.5 kDa in the Recombinant Human IL-23 Protein (Catalog # 1290-IL), while the predicted molecular weight for the p40 subunit is 34.7 kDa for the Recombinant Human IL-12 Protein (Catalog # 219-IL)?
A: The Recombinant Human IL-23 Protein (Catalog # 1290-IL) and Recombinant Human IL-12 Protein (Catalog # 219-IL) p40 subunits share the same p40 sequence, Ile23-Ser328 (Accession # P29460). However, the p40 subunit for Recombinant Human IL-23 (Catalog # 1290-IL) also contains a portion of the GS linker that remains after cleaving p40 subunit from the p19 subunit, so its predicted molecular is slightly larger (36.5 kDa) compared to that of the Recombinant Human IL-12 Protein (Catalog # 219-IL; 34.7 kDa). Please see the product-specific page for detailed sequence information.
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Q: What is the difference between Recombinant Human IL-12 Protein (Catalog # 219-IL) and Recombinant Human Il-12 (linked heterodimer) Protein (Catalog # 10018-IL?
A: The Recombinant Human IL-12 Protein (Catalog # 219-IL), expressed in Sf 21 cells, is a disulfide-linked homodimer consisting of the p35 and p40 subunits. The subunits can be separated under reducing conditions. The Recombinant Human IL-12 (linked heterodimer) Protein (Catalog # 10018-IL), expressed in HEK293 cells, is a chimeric protein consisting of the p35 and p40 subunits connected by a linker. These two subunits cannot be separated.
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Q: Human IL-23 and Human IL-12 share a p40 subunit. Why is the predicted molecular weight for the p40 subunit 36.5 kDa in the Recombinant Human IL-23 Protein (Catalog # 1290-IL), while the predicted molecular weight for the p40 subunit is 34.7 kDa for the Recombinant Human IL-12 Protein (Catalog # 219-IL)?
A: The Recombinant Human IL-23 Protein (Catalog # 1290-IL) and Recombinant Human IL-12 Protein (Catalog # 219-IL) p40 subunits share the same p40 sequence, Ile23-Ser328 (Accession # P29460). However, the p40 subunit for Recombinant Human IL-23 (Catalog # 1290-IL) also contains a portion of the GS linker that remains after cleaving p40 subunit from the p19 subunit, so its predicted molecular is slightly larger (36.5 kDa) compared to that of the Recombinant Human IL-12 Protein (Catalog # 219-IL; 34.7 kDa). Please see the product-specific page for detailed sequence information.
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Q: What is the difference between Recombinant Human IL-12 Protein (Catalog # 219-IL) and Recombinant Human Il-12 (linked heterodimer) Protein (Catalog # 10018-IL?
A: The Recombinant Human IL-12 Protein (Catalog # 219-IL), expressed in Sf 21 cells, is a disulfide-linked homodimer consisting of the p35 and p40 subunits. The subunits can be separated under reducing conditions. The Recombinant Human IL-12 (linked heterodimer) Protein (Catalog # 10018-IL), expressed in HEK293 cells, is a chimeric protein consisting of the p35 and p40 subunits connected by a linker. These two subunits cannot be separated.
