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*
Max Planck Institut für Immunbiologie, Freiburg, Germany; and
Division of Immunology and Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra, Australia
Cytotoxic T (Tc) cells deficient in perforin lyse Fas-negative targets after lengthy incubation periods. This process is independent of granzymes, and killing occurs via the Fas pathway for the following reasons. Interaction of perforin-deficient Tc cells with Fas-negative targets leads to an up-regulation of Fas that is dependent on Ag recognition, de novo synthesis, and transport of proteins to the target cell surface. Treatment of effectors with brefeldin A, but not with the exocytosis inhibitor concanamycin, inhibited this process. Lysis of targets is inhibited by anti-Fas Abs, soluble mouse Fas-Fc, and the caspase-cascade inhibitor, crm-A. Targets from Fas-mutant lpr mice are refractory to lysis, and Tc cells from mice deficient in Fas- and perforin-mediated lysis do not lyse Fas-negative targets. The possible relevance of this exocytosis-independent cytolytic process in the regulation of T cell activity and control of pathogens is discussed.
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