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IFG; IFI; IFNG; IFNgamma; IFN-gamma; Immune interferon; interferon gamma; interferon, gamma
Bcakground
Interferon-gamma (IFN-gamma) , also known as type II or immune interferon, exerts a wide range of immunoregulatory activities and is considered to be the prototype proinflammatory cytokine (1, 2). Mature mouse IFN-gamma exists as a noncovalently linked homodimer of 20-25 kDa variably glycosylated subunits (3). It shares 86% amino acid sequence identity with rat IFN-gamma and 38%-44% with bovine, canine, cotton rat, equine, feline, human, porcine, and rhesus IFN-gamma. IFN-gamma dimers bind to IFN- gamma RI (alpha subunits) which then interact with IFN-gamma RII (beta subunits) to form the functional receptor complex of two alpha and two beta subunits. Inclusion of IFN-gamma RII increases the binding affinity for ligand and the efficiency of signal transduction (4, 5). IFN-gamma is produced by a variety of immune cells under inflammatory conditions, notably by T cells and NK cells (6). It plays a key role in host defense by promoting the development and activation of Th1 cells, chemoattraction and activation of monocytes and macrophages, up-regulation of antigen presentation molecules, and immunoglobulin class switching in B cells. It also exhibits antiviral, antiproliferative, and apoptotic effects (6, 7). In addition, IFN-gamma functions as an anti-inflammatory mediator by promoting the development of regulatory T cells and inhibiting Th17 cell differentiation (8, 9). The pleiotropic effects of IFN-gamma contribute to the development of multiple aspects of atherosclerosis (7).
Reference
1. Billiau, A. and P. Matthys (2009) Cytokine Growth Factor Rev. 20:97.
2. Pestka, S. et al. (2004) Immunol. Rev. 202:8.
3. Gray, P.W. and D.V. Goeddel (1983) Proc. Natl. Acad. Sci. 80:5842.
4. Marsters, S.A. et al. (1995) Proc. Natl. Acad. Sci. 92:5401.
5. Krause, C.D. et al. (2000) J. Biol. Chem. 275:22995.
6. Schroder, K. et al. (2004) J. Leukoc. Biol. 75:163.
7. McLaren, J.E. and D.P. Ramji (2009) Cytokine Growth Factor Rev. 20:125.
8. Muhl, H. and J. Pfeilschifter (2003) Int. Immunopharmacol. 3:1247.
9. Kelchtermans, H. et al. (2008) Trends Immunol. 29:479.
Specifications
Synonyms | IFG; IFI; IFNG; IFNgamma; IFN-gamma; Immune interferon; interferon gamma; interferon, gamma |
Accession # | P01580 |
Source | Human embryonic kidney cell, HEK293-derived mouse IFN-gamma protein |
His23-Cys155 | |
Predicted Moleucular weight | 15.5 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 an anti-viral assay using L-929 mouse fibroblast cells infected with encephalomyocarditis (EMC) virus. |
The EC50 for this effect is 0.03-0.1 ng/mL. |
SDS-PAGE
Bioactivity
Documents
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