Abstract
The appearance of macrophages in human tumours, the so called tumour-infiltrating or tumour-associated macrophages (TIM or TAM) has suggested a role for these cells in host defence mechanisms against cancer. In this review we discuss monocyte-mediated cytotoxic activity against melanoma, as reported by a number of different authors. Although most studies described in this review have used melanoma cell lines as targets for monocyte/macrophage cytotoxicity, it would be incomplete if cytotoxicity against other target cells such as K562 or WEHI-164 is not discussed. At least two distinct mechanisms of killing by monocytes/macrophages can be distinguished; direct recognition and cytotoxicity by the effector cells and antibody-mediated lysis of the tumour cells (antibody-dependent cellular cytotoxicity, ADCC). Both types of cytotoxicity will be discussed.
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