Natural Killer (NK) cells are cytotoxic lymphocytes that constitute a major component of the innate immune system. Immunosurveillance of the host by NK cells for malignant and virally-infected cells results in direct cytotoxicity and the production of cytokines to enhance the immune response. This protocol will describe the adoptive transfer of purified NK cells into NK cell-deficient tumor bearing mice in order to establish the intrinsic functionality of NK cells.
