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Definition of INTERFERON
: any of a group of heat-stable soluble basic antiviral glycoprotein cytokines of low molecular weight that are produced by cells exposed usually to the action of a virus, sometimes to the action of another intracellular parasite (as a bacterium), or experimentally to the action of some chemicals
: any of a group of heat-stable soluble basic antiviral glycoproteins of low molecular weight that are produced usually by cells exposed to the action of a virus, sometimes to the action of another intracellular parasite (as a bacterium), or experimentally to the action of some chemicals, and that include some used medically as antiviral or antineoplastic agents—see alpha interferon, beta interferon, gamma interferon
Any of several related proteins produced by all vertebrates and possibly some invertebrates. They play an important role in resistance to infection. The body's most rapidly produced and important defense against viruses, they can also combat bacteria and parasites (seeparasitism), inhibit cell division, and promote or impede cell differentiation. Interferon's effect is indirectit reacts with susceptible cells, which then resist virus multiplicationin contrast to antibodies, which act by combining directly with a specific virus. Various types of interferons are distinguished by their characteristics as proteins and by which cells produce them. Some are now produced by genetic engineering. Initial hopes that interferon would be a wonder drug for a wide variety of diseases were deflated by its serious side effects, but a few rare conditions respond to it.