interferon-gamma

(noun)

a cytokine that is critical for innate and adaptive immunity against viral and intracellular bacterial infections.

Related Terms

  • phagocyte

Examples of interferon-gamma in the following topics:

  • Superantigens

    • More importantly, the large number of activated T-cells secretes large amounts of cytokines, the most important of which is Interferon gamma.
    • This excess amount of IFN-gamma is in turn what activates the macrophages.
  • Macrophages

    • Most macrophages express high levels of interferon-gamma, a mechanism through which antigen presentation and T cell activation is enhanced.
  • Interferons

    • Interferons (IFNs) are proteins made and released by host cells in response to the presence of pathogens.
    • The type I interferons present in humans are IFN-α, IFN-β and IFN-ω.
    • Interferon type II: These bind to IFNGR that consist of IFNGR1 and IFNGR2 chains.
    • In addition, interferons induce production of hundreds of other proteins—known collectively as interferon-stimulated genes (ISGs)—that have roles in combating viruses.
    • Interferons, such as interferon gamma, directly activate other immune cells, such as macrophages and natural killer cells.
  • Phagocyte Migration and Phagocytosis

    • But, during an infection, they receive chemical signals—usually interferon gamma—which increases their production of MHC II molecules and which prepares them for presenting antigens.
  • Type IV (Delayed Cell-Mediated) Reactions

    • CD4+ T cells secrete IL-2 and interferon gamma, further inducing the release of other Th1 cytokines, thus mediating the immune response.
  • Natural Passive Immunity

    • In addition to the IgA and IgG, human milk also contains: oligosaccharides and mucins that adhere to bacteria and viruses to interfere with their attachment to host cells; lactoferrin to bind iron and make it unavailable to most bacteria; B12 binding protein to deprive bacteria of needed vitamin B12; bifidus factor that promotes the growth of Lactobacillus bifidus, normal flora in the gastrointestinal tract of infants that crowds out harmful bacteria; fibronectin that increases the antimicrobial activity of macrophages and helps repair tissue damage from infection in the gastrointestinal tract; gamma-interferon, a cytokine that enhances the activity of certain immune cells; hormones and growth factors that stimulate the baby's gastrointestinal tract to mature faster and be less susceptible to infection; and lysozyme to break down peptidoglycan in bacterial cell walls.
  • Treatment of Animal Viral Infections

    • Interferons play pivotal roles in shaping the immune responses in mammals.
    • One of the best-known of this class of drugs are interferons, which inhibit viral synthesis in infected cells.
    • Interferons (IFNs) play pivotal roles in shaping the immune responses in mammals and are particularly important for the control of viral infections, cell growth, and immune regulation.
    • Elucidating the molecular and cellular biology of the virus-interferon interaction is key to understanding issues such as viral pathogenesis, latency, and the development of novel antivirals.
  • Radiation

    • The gamma radiation is emitted from a radioisotope (usually cobalt-60 or cesium-137).
    • Sterilization by irradiation with gamma rays may, in some cases affect material properties.
    • Electron beams use an on-off technology and provide a much higher dosing rate than gamma or x-rays.
    • A limitation is that electron beams are less penetrating than either gamma or x-rays.
    • Irradiation with X-rays or gamma rays does not make materials radioactive.
  • Immunoassays for Disease

    • The humoral component includes complement, lyzozyme, interferon, antibodies, and cytokines.
  • Normal Microbiota and Host Relationships

    • Different interferons (IgA, IgG, IgM, etc. ) play roles in defeating viruses located in our membranes.
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