In this investigation, we have examined the relative sensitivity of human naïve, central memory (TCM), and two types of effector memory CD8+ T cells (TEM and TEMRA) to TNF-α-induced apoptosis. Our data show that naïve and TCM CD8+ T cells were sensitive, whereas TEM and TEMRA CD8+ T cells were relatively resistant to TNF-a-induced apoptosis. The apoptosis profile correlated with the activation of caspase-8 and caspase-3. However, no correlation was observed between relative sensitivity of four CD8 + T cell subsets to apoptosis and the expression of TNFR-I or TNFR-II. TEM and TEMRA CD8+ T cells displayed increased phosphorylation of IKKα/β and IκB and increased NF-κB activity as compared to naïve and TCM CD8+ T cells. Bcl-2, Bcl-xL and FLIPL expression was higher and Bax expression was lower in TEM and TEMRA CD8+ T cells as compared to naïve and TCM CD8+ T cells. These data suggest that signaling molecules downstream of TNFRs may be responsible for differential sensitivity among subsets of CD8+ T cells to TNF-α-induced apoptosis.
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Abbreviations
- IAPs:
-
inhibitor of apoptosis proteins
- TNF-α:
-
tumor necrosis factor-α
- TNFR-I and TNFR-II:
-
tumor necrosis factor I and II
- TCM :
-
central memory T cells
- TEM :
-
effector memory T cells
- TEMRA :
-
effector memory CD45RA+ T cells
- TRAF2:
-
TNFR-associated factor 2
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This work was supported in part by USPHS grant AG18313.
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Gupta, S., Su, H., Bi, R. et al. Differential Sensitivity of Naïve and Memory Subsets of Human CD8+ T Cells to TNF-α-Induced Apoptosis. J Clin Immunol 26, 193–203 (2006). https://doi.org/10.1007/s10875-006-9019-1
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DOI: https://doi.org/10.1007/s10875-006-9019-1