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It is widely assumed that the development of memory CD8 T cells requires the escape of CTLs from programmed cell death. We show in this study that although serine protease inhibitor 6 (Spi6) is required to protect clonal bursts of CTLs from granzyme B-induced programmed cell death, it is not required for the development of memory cells. This conclusion is reached because memory cell precursors down-regulate both Spi6 and granzyme B, unlike CTLs, and they do not require Spi6 for survival. These findings suggest that memory CD8 T cells are derived from progenitors that are refractory to self-inflicted damage, rather than derived from fully differentiated CTLs.

Differential Survival of Cytotoxic T Cells and Memory Cell Precursors