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Dendritic cells (DCs) mediate cross-priming of tumor-specific T cells by acquiring tumor Ags from dead cancer cells. The process of cross-priming would be most economical and efficient if DCs also induce death of cancer cells. In this study, we demonstrate that normal human in vitro generated immature DCs consistently and efficiently induce apoptosis in cancer cell lines, freshly isolated noncultured cancer cells, and normal proliferating endothelial cells, but not in most normal cells. In addition, in vivo generated noncultured peripheral blood immature DCs mediate similar tumoricidal activity as their in vitro counterpart, indicating that this DC activity might be biologically relevant. In contrast to immature DCs, freshly isolated monocytes (myeloid DC precursors) and in vitro generated mature DCs are not cytotoxic or are less cytotoxic, respectively, suggesting that DC-mediated killing of cancer cells is developmentally regulated. Comparable cytotoxic activity is mediated by untreated DCs, paraformaldehyde-fixed DCs, and soluble products of DCs, and is destructible by proteases, indicating that both cell membrane-bound and secreted proteins mediate this DC function. Overall, our data demonstrate that human immature DCs are capable of inducing apoptosis in cancer cells and thus to both directly mediate anticancer activity and initiate processing of cellular tumor Ags.

Innate Direct Anticancer Effector Function of Human Immature Dendritic Cells. I. Involvement of an Apoptosis-Inducing Pathway