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- W2150928992 abstract "Abstract Ag presentation by dendritic cells (DC) in vivo is essential to the initiation of primary and secondary T cell responses. We have reported that DC presenting Ag in the context of MHC I molecules also become targets of specific CTL and are rapidly killed in mice. However, activated DC up-regulate expression of serine protease inhibitor (SPI)-6, a specific blocker of the cytotoxic granule protein granzyme B, which modulates their susceptibility to CTL-mediated killing in vitro. We wanted to determine whether susceptibility to CTL-mediated killing in vivo is also modulated by DC activation. As was previously reported by others, DC treated with different doses of LPS expressed higher levels of SPI-6 mRNA than did untreated DC. The increased expression of SPI-6 was functionally relevant, as LPS-treated DC became less susceptible to CTL-mediated killing in vitro. However, when these LPS-treated DC were injected in vivo, they remained sensitive to CTL-mediated killing regardless of whether the CTL activity was elicited in host mice via active immunization or was passively transferred via injection of in vitro-activated CTL. LPS-treated DC were also sensitive to killing in lymph node during the reactivation of memory CTL. We conclude that increased SPI-6 expression is not sufficient to confer DC with resistance to direct killing in vivo. However, SPI-6 expression may provide DC with a survival advantage in some conditions, such as those modeled by in vitro cytotoxicity assays." @default.
- W2150928992 created "2016-06-24" @default.
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- W2150928992 date "2008-12-15" @default.
- W2150928992 modified "2023-10-14" @default.
- W2150928992 title "Dendritic Cells Treated with Lipopolysaccharide Up-Regulate Serine Protease Inhibitor 6 and Remain Sensitive to Killing by Cytotoxic T Lymphocytes In Vivo" @default.
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- W2150928992 doi "https://doi.org/10.4049/jimmunol.181.12.8356" @default.
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