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• W2061851108 abstract "CD8hi+ cytotoxic T lymphocytes (CTL) are major players in immune defense. In addition, they contribute to the maintenance of immune homeostasis. We now describe a hitherto unavailable, but simple assay to determine ex vivo lytic granule-based cytotoxic functions of human CD8hi+ CTL subgroups in a clinical setting, under target cell free conditions. Ficoll-isolated peripheral blood lymphocytes from 17 healthy volunteers were stimulated either by phorbol 12-myristate 13-acetate (PMA) in combination with ionomycin or by antibody mediated crosslinking of the CD3 molecule on the T cell surface. Using perforin as a marker for lytic granules, the reduction of CTL granules over time intervals up to 120 min was quantified by FACScan flow cytometry. The kinetics of perforin reduction were compared to the kinetics of NA-CBZ-l-lysine-thiobenzyl ester hydrochloride (BLT)-esterase release and of CD63 upregulation. The reduction in the perforin+ portion of CD8hi+ CTLs was correlated inversely with BLT-esterase release and CD63 upregulation. At 30 and 120 min after PMA/ionomycin stimulation, 55±14% and 42±14%, respectively, of CD8hi+ CTLs still stained perforin+ (time point 0 min=100%). Perforin-granule release induced by CD3-crosslinking occurred as fast within 30 min (55±17%), but over the 120 min time interval it was not as complete when compared to PMA/ionomycin-stimulated perforin-reduction. Thus, the combination of an established degranulation assay with the power of immuno flow cytometry allows one to investigate the cytotoxic capability of CTL-subtypes and the kinetics of perforin-granule release. In addition, the assay may prove useful in the elucidation of intracellular signaling cascades governing the perforin-granule release process." @default.
• W2061851108 created "2016-06-24" @default.
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• W2061851108 date "2004-06-01" @default.
• W2061851108 modified "2023-10-18" @default.
• W2061851108 title "A novel flow cytometric assay focusing on perforin release mechanisms of cytotoxic T lymphocytes" @default.
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• W2061851108 doi "https://doi.org/10.1016/j.jim.2004.01.028" @default.
• W2061851108 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15251408" @default.
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