All kit components of this kit are stable at 2 to 8°C. Any unused reconstituted standard should be discarded or frozen at -70°C. Standard can be frozen and thawed one time only without loss of immunoreactivity.
< 15.262 pg/ml
Sample Type :
Human serum, plasma, cell lysate, culture supernatants, buffered solution
Interferon gamma (IFNγ) is a dimerized soluble cytokine that is the only member of the type II class of interferons. The existence of this interferon, which early in its history was known as immune interferon, was recognized in 1970 when tuberculin-sensitized peritoneal cells were challenged with PPD and resulting supernatants were shown to inhibit growth of vesicular stomatitis virus. That report also contained the basic observation underlying the now widely employed interferon gamma release assay used to test for TB. This interferon was later called macrophage-activating factor, a term now used to describe a larger family of proteins to which IFNγ belongs. In humans, the IFNγ protein is encoded by the IFNG gene. IFNγ, or type II interferon, is a cytokine that is critical for innate and adaptive immunity against viral and intracellular bacterial infections and for tumor control. IFNγ is an important activator of macrophages. Aberrant IFNγ expression is associated with a number of autoinflammatory and autoimmune diseases. The importance of IFNγ in the immune system stems in part from its ability to inhibit viral replication directly, and most importantly from its immunostimulatory and immunomodulatory effects. IFNγ is produced predominantly by natural killer (NK) and natural killer T (NKT) cells as part of the innate immune response, and by CD4 Th1 and CD8 cytotoxic T lymphocyte (CTL) effector T cells once antigen-specific immunity develops.
Background reference :
1) Thiel DJ, le Du MH, Walter RL, D'Arcy A, Chène C, Fountoulakis M, Garotta G, Winkler FK, Ealick SE (September 2000). "Observation of an unexpected third receptor molecule in the crystal structure of human interferon-gamma receptor complex". Structure 8 (9): 927–36.
2) Gray PW, Goeddel DV (August 1982). "Structure of the human immune interferon gene". Nature 298 (5877): 859–63.
3) Milstone, LM; Waksman BH (1970). "Release of virus inhibitor from tuberculin-sensitized peritoneal cells stimulated by antigen". J Immunol 105: 1068–1071.
4) Naylor SL, Sakaguchi AY, Shows TB, Law ML, Goeddel DV, Gray PW (March 1983). "Human immune interferon gene is located on chromosome 12". J. Exp. Med. 157 (3): 1020–7.
5) Schoenborn JR, Wilson CB (2007). "Regulation of interferon-gamma during innate and adaptive immune responses". Adv. Immunol. 96: 41–101.