Word: antigen
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...nervous system, and leads to gradual loss of muscular control. Initial studies suggest that small doses of cyclosporine may be effective in blunting the symptoms of the disease. Some researchers, however, are searching for a more selective remedy that involves mass-producing antibodies that are specific to one antigen. These so-called monoclonal antibodies are designed to immobilize only those B cells that produce the antibodies responsible for the disease...
...tremendous synergy" between alpha interferon and IL-2 in attacking cancer cells. While IL-2 works to make the killer cells more potent, he explains, they "have to recognize something unique on the surface of the cancer cell in order to kill it." That something is an antigen, and interferon seems to make it more "visible" to the killer cells...
...macrophage as friend, or self, and not attack it. After digesting the virus, the macrophage proudly displays strips of protein from the virus in the grooves of some of its MHC molecules. Once a bit of protein -- which is part of the virus's own identity molecule, or antigen -- is nestled in the groove of the macrophage's MHC molecule, it acts as a red flag for the immune system, warning it that a particular type of virus is loose in the body...
...safe from scavengers and antibodies, but the free lunch is over quickly. While the B cells are being activated, other helper T cells have been creating an army of killer T cells. These killers recognize the flu-ridden cells because, like macrophages, infected cells display a bit of viral antigen on their outer membranes. Says Coffman: "For many viral infections, the most important response is the killer T cell. Viruses live inside cells, so it's essential to kill not only the viruses themselves but those cells that are infected with the virus...
...soon to have a powerful ally in their campaign against viruses: vaccines made from genetically engineered viruses. At the NIH, Dr. Bernard Moss is using recombinant DNA techniques to convert vaccinia, a large virus that causes cowpox, into a one-shot, multidisease vaccine. He plans to insert only the antigen-coding genes of eight to ten kinds of dangerous viruses into the DNA of live but weakened vaccinia viruses. The re- engineered vaccinia would then sport the antigens of the harmful viruses, but not their ability to cause disease. Once inoculated, it would stimulate the immune system into producing cells...