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CLMF p35; CLMF1; Cytotoxic lymphocyte maturation factor 35 kDa subunit; IL-12 subunit p35; IL12; IL-12; IL-12, subunit p35; IL12A; interleukin 12, p35; interleukin 12A (natural killer cell stimulatory factor 1, cytotoxic lymphocytematuration factor 1, p35); interleukin-12 alpha chain; interleukin-12 subunit alpha; natural killer cell stimulatory factor 1, 35 kD subunit; NF cell stimulatory factor chain 1; NK cell stimulatory factor chain 1; NKSF1; p35
$280.00
Sku: RP305-10UG
Bcakground
Interleukin-12 (IL-12) , also known as natural killer cell stimulatory factor (NKSF) or cytotoxic lymphocyte maturation factor (CLMF), is a pleiotropic cytokine originally identified in the medium of activated human B lymphoblastoid cell lines (1). The p40 subunit of IL-12 has been shown to have extensive amino acid sequence homology to the extracellular domain of the human IL-6 receptor while the p35 subunit shows distant but significant sequence similarity to IL-6, G-CSF, and chicken MGF (2, 3). These observations have led to the suggestion that IL-12 might have evolved from a cytokine/soluble receptor complex. Human and murine IL-12 share 70% and 60% amino acid sequence homology in their p40 and p35 subunits, respectively. IL-12 apparently shows species specificity with human IL-12 reportedly showing minimal activity in the murine system. 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 (4). These effects include inducing production of IFN-r 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 (5). 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.
Reference
1. Gubler, U. et al. (1991) Proc. Natl. Acad. Sci. 88:4143.
2. Gearing, D. et al. (1991) Cell 66:9.
3. Merberg, D. et al. (1992) Immunology Today 13:78.
4. Wolf, S.F. et al. (1991) Journal of Immunology 146:3074.
5. Airoldi, I. et al. (2000) Journal of Immunology 165:6880.
Specifications
| Synonyms | Human IL12; hIL-12, recombinant IL12, interleukin 12 |
| Accession # | P29460 (IL-12p40), P29459 (IL-12p35) |
| Source | Human embryonic kidney cell, HEK293-derived human IL12 protein |
| IL-12 p40 (Ile23-Ser328), IL-12 p35 (Arg23-Ser219) | |
| Predicted Moleucular weight | 22.5 kDa + 34.7 kDa |
Components and Storage
| Formulation | Solution protein. |
| Dissolved in sterile PBS buffer. | |
| This solution can be diluted into other aqueous buffers. Centrifuge the vial prior to opening. | |
| Storage and Stability | Avoid repeated freeze-thaw cycles. |
| It is recommended that the protein be aliquoted for optimal storage. | |
| 12 months from date of receipt, -20 to -70 °C as supplied. | |
| Shipping | Shipping with dry ice. |
Quality
| Purity | > 95%, determined by SDS-PAGE. |
| Endotoxin Level | <0.010 EU per 1 ug of the protein by the LAL method. |
| Activity | Measured in a cell proliferation assay using PHA-stimulated human T lymphoblasts. |
| The EC50 for this effect is 4-40 pg/mL |
SDS-PAGE
Gel filtration
Bioactivity
Documents
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