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. 1996 Sep 1;495(Pt 2):319–329. doi: 10.1113/jphysiol.1996.sp021596

Necrosis and apoptosis associated with distinct Ca2+ response patterns in target cells attacked by human natural killer cells.

Y Oshimi 1, K Oshimi 1, S Miyazaki 1
PMCID: PMC1160794  PMID: 8887746

Abstract

1. During the process of cell death, rises in cytosolic Ca2+ concentration ([Ca2+]i) together with structural changes were investigated in target cells attacked by purified CD3-,CD16+ human natural killer (NK) cells. 2. In the target cell line K562, a rapid [Ca2+]i rise to 1-2 microM occurred a few minutes after NK cell-target cell contact, immediately followed by leakage of the Ca2+ indicator dye fura-2 from the cell. Cells were permeabilized, but their chromatin was not fragmented. The changes were basically consistent with those seen in necrosis induced by activated complement. 3. In the target cell line MOLT-4, which expressed the apoptosis-inducing surface antigen Fas much more strongly than K562, the majority of attacked cells displayed a [Ca2+]i rise to 0.7-1 microM followed by a slow decline, often associated with diminishing [Ca2+]i oscillations. As a whole, [Ca2+]i remained higher than 150 nM for at least 1.5-3 h (approximately 100 nM in control cells). 4. MOLT-4 cells attacked by NK cells became bubble shaped within 20 min of the main [Ca2+]i rise reaching its peak, and then both the cell and chromatin were fragmented into small pieces. These findings were basically consistent with those in apoptosis induced by a monoclonal antibody against the surface antigen Fas. 5. NK cells induced both necrosis and apoptosis in cell lines insensitive to NK cells in the presence of an antibody against the major histocompatibility complex class I (antibody-dependent cell-mediated cytotoxicity, ADCC). The distinct Ca2+ responses patterns described above corresponded to necrosis or apoptosis in different cells stimulated by the common ADCC pathway. 6. Human NK cells were found to be capable of inducing necrosis (membrane damage) or apoptosis (nuclear damage) depending on the target cell types. The characteristic Ca2+ response profile was a good indicator for distinguishing between the modes of cell death induced by the cytotoxicity of the killer cells.

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Selected References

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