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• W4247489738 startingPage "716" @default.
• W4247489738 abstract "CD44 is a cytotoxic triggering molecule on activated, but not fresh natural killer (NK) cells. In the current study, metabolic pathways used in CD44-directed lysis (CD44DL) were examined using activated human NK cells as effectors. We found that CD44 expressed by activated NK cells was indistinguishable in isoform and molecular weight from CD44 on unactivated cells. However, de novo protein expression was required for the induction of CD44DL, suggesting that activated NK cells contain proteins not present in fresh NK cells that couple CD44 to the lytic machinery. Concanimycin A, a selective inhibitor of perforin-based cytolysis, totally blocked CD44DL, natural cytototoxicity, and antibody-dependent cell-mediated cytolysis (ADCC). Moreover, studies in which kinase inhibitors were added during the effector phase of lysis indicated that protein-tyrosine and ser/thr kinases were required for all three cytolytic activities and that protein kinase C played a nonessential role in lysis. By contrast, wortmannin totally inhibited CD44DL, but failed to block natural cytotoxicity and only partially blocked ADCC, suggesting that phosphatidylinositol 3-kinase (PI 3-kinase) is required at an early, receptor-specific stage of CD44DL. Finally, cytochalasin B enhanced CD44DL, but not ADCC, indicating that CD44DL is modulated by actin polymerization. Taken together, our data suggest that CD44 in NK cells interacts with proteins induced during interleukin-2 activation in a triggering pathway that induces perforin release, requires PI 3-kinase, and is modulated by the cytoskeleton." @default.
• W4247489738 created "2022-05-12" @default.
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• W4247489738 date "1997-07-15" @default.
• W4247489738 modified "2023-09-28" @default.
• W4247489738 title "Signaling Pathways Regulating CD44-Dependent Cytolysis in Natural Killer Cells" @default.
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• W4247489738 doi "https://doi.org/10.1182/blood.v90.2.716.716_716_725" @default.
• W4247489738 hasPublicationYear "1997" @default.
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