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pubmed-article:8482839pubmed:abstractTextSignaling via the CD3/TCR complex induces programmed cell death (apoptosis) in immature thymocytes and transformed T lymphocytes (hybridomas or leukemic cells). Accumulating evidence indicates, however, that apoptosis can be triggered also in mature peripheral T cells. Here we show that a significant fraction of cells of a given IL-2-dependent TCR-alpha beta + clone or polyclonal short term line is killed when cultured for 20 h in the presence of PHA, anti-CD3 (OKT3), or anti-TCR (BMA031) mAb. Apoptosis can be triggered by these stimuli in CD4+, CD8+, and CD4-CD8- (double-negative) TCR-alpha beta+ clones. Activation-driven cell death (as quantified by propidium iodide staining and FACS analysis) is associated with fragmentation of DNA into oligonucleosomal bands of approximately 200 bp. Although freshly isolated peripheral blood T cells are largely resistant to apoptosis, the sensitivity to anti-CD3/TCR mAb or PHA-triggered cell death gradually increases upon activation and IL-2-dependent culture of T cells, and reaches a plateau level after 15 to 20 days. These data indicate that stimuli that activate resting T cells initiate death by apoptosis in activated T cells. The implications of these results for the regulation of cellular immune responses and the establishment of peripheral tolerance will be discussed.lld:pubmed
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pubmed-article:8482839pubmed:articleTitleInduction of activation-driven death (apoptosis) in activated but not resting peripheral blood T cells.lld:pubmed
pubmed-article:8482839pubmed:affiliationInstitute of Immunology, University of Heidelberg, Germany.lld:pubmed
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