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- W1251599274 abstract "Abstract In the widely accepted model of granule-mediated killing by cytotoxic lymphocytes, granzyme B entry into the target cell is facilitated by the pore forming molecule, perforin. Using indirect immunofluorescence and also direct visualization of fluorescein isothiocyanate (FITC)-conjugated granzyme B, we demonstrate internalization in the absence of perforin. Induction of the lytic pathway, however, required a second signal that was provided by perforin or adenovirus (Ad2). The combination of agents also resulted in a dramatic relocalization of the granzyme. Microinjection of granzyme B directly into the cytoplasm of target cells resulted in apoptosis without the necessity of a second stimulus. This suggested that the key event is the presence of granzyme B in the cytoplasm, and that when the enzyme is internalized by a target cell, it trafficks to an intracellular compartment and accumulates until release is stimulated by the addition of perforin. We found that the proteinase passed through rab5-positive vesicles and then accumulated within a novel compartment. On the basis of these results, we propose a new model for granzyme-perforin–induced target cell lysis in which granzyme B is subjected to trafficking events in the target cell that control and contribute to cell death. © 1998 by The American Society of Hematology." @default.
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- W1251599274 date "1998-08-01" @default.
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- W1251599274 title "Entry and Trafficking of Granzyme B in Target Cells During Granzyme B-Perforin–Mediated Apoptosis" @default.
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- W1251599274 doi "https://doi.org/10.1182/blood.v92.3.1044" @default.
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