Differential ability of Th1 and Th2 T cells to express Fas ligand and to undergo activation-induced cell death - PubMed (original) (raw)
Comparative Study
. 1994 Oct;6(10):1545-53.
doi: 10.1093/intimm/6.10.1545.
Affiliations
- PMID: 7530039
- DOI: 10.1093/intimm/6.10.1545
Comparative Study
Differential ability of Th1 and Th2 T cells to express Fas ligand and to undergo activation-induced cell death
F Ramsdell et al. Int Immunol. 1994 Oct.
Abstract
Stimulation of previously activated T cells through the antigen receptor can result in the apoptotic death of the responding cell, a process referred to as activation-induced cell death (AICD). This process appears to involve Fas (CD95) and its ligand (Fas-L). The distribution of Fas and Fas-L on various T cell subsets has not been extensively characterized. We have therefore analyzed cells committed to a Th1- or Th2-type differentiation pattern for the expression and function of Fas-L. Using both a sensitive bioassay and flow cytometry, we demonstrate that cloned Th1 cells express high levels of Fas-L, whereas cloned Th2 cells express only low levels. The expression of Fas-L by Th1 and Th2 cells correlates with the relative abilities of these two cell types to undergo AICD. Whereas AICD is readily observed in cultures of cloned Th1, but not Th2 cells, Th2 cells are capable of undergoing apoptosis in the presence of Th1 cells expressing Fas-L. The ability of T cells to undergo AICD appears to be unrelated to the presence of various cytokines. Thus, the Fas/Fas-L pathway appears to be critical for the induction of AICD and this pathway is differentially regulated in cells committed to either Th1 or Th2 differentiation.
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