Immunologic Reactivity of Lymphoid Cells in Tumors
There have been many studies of immune responses against tumors and almost all of these have focused on the reactivity in the blood or spleen. From such studies, it has become clear that a wide variety of effector cells and types of immune functions may be involved in antitumor responses. Particular attention has been directed toward T cells that may be directly cytotoxic against tumor cells or may proliferate or produce lymphokines upon stimulation with tumor antigens. However, other effector mechanisms may be involved and need to be considered. These include B cells, which can produce antibodies that affect tumor cells directly or that interact with K cells or macrophages and thereby mediate antibody-dependent cell-mediated cytotoxicity; macrophages and monocytes, which are spontaneously cytotoxic or can be activated to become cytotoxic against tumor cells; and natural killer (NK) cells, a subpopulation of lymphocytes with spontaneous cytotoxic reactivity against tumor cells.
KeywordsNatural Killer Migration Inhibition Factor Velocity Sedimentation Suppressor Cell Cytolytic Activity
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