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Natural killer cells or NK cells are a type of cytotoxic lymphocyte critical to the innate immune system.his role of NK cells is critical to immune success particularly because T cells are unable to recognize pathogens in the absence of surface antigens. Tumor cell detection results in activation of NK cells and consequent cytokine production and release.
Similar to cytolytic CD8+ T cells, NK cells contain a variety of proteins that mediate the destruction of target cells by inducing a program of apoptotic cell death. NK cells are characterized by the presence of cytoplasmic granules that contain proteins such as perforin and granzymes.nlike most lymphoid cells, NK cells are part of the innate immune system and mediate their effect in an antigen independent manner that in general does not give rise to immunological memory or protective immunity.