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Natural killer (NK) cells participate in early immune defenses against pathogens and tumors and play a major role as immune effector and regulatory cells. The NK cell-mediated elimination of an infected or cancerous cell is a highly regulated process that requires the formation of a cell contact, the establishment of an immunological synapse and the polarization and release of lytic granules. Additionally, the detachment of NK cells from target cells is important for NK cells to bind and kill other cells in a process called serial killing. However, very little is known about this detachment process. Here, we show that NK detachment is directly connected to the successful killing of a target cell. The inhibition of killing due to reduced NK cell cytotoxicity or increased target cell resistance results in defective detachment and prolonged contact times. This effect leads to sustained Ca 2+ flux in NK cells and the hypersecretion of proinflammatory cytokines. Linking defective cytotoxicity with enhanced cytokine secretion via reduced detachment may explain inflammatory pathologies in several diseases.

NK cell detachment from target cells is regulated by successful cytotoxicity and influences cytokine production