Based upon their migrating properties and effector functions, CD8(+) T cells have been further classified into central memory (T(CM)) and two types of effector memory (T(EM) and T(EMRA)) cells. These memory cells display distinct replicative characteristics. Because apoptosis plays an important role in cellular homeostasis, we have examined the relative sensitivity of naïve (T(N)) and different memory CD8(+) T cells to apoptosis. We show that both T(EM) and T(EMRA) CD8(+) T cells are resistant to apoptosis, whereas T(N) and T(CM) CD8(+) T cells are sensitive to apoptosis.
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Gupta et al. (2007) studied this question.
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