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- W2155706994 abstract "ABSTRACT Herpes simplex virus type 1 (HSV-1) is one of the most frequent and successful human pathogens. It targets immature dendritic cells (iDCs) to interfere with the antiviral immune response. The mechanisms underlying apoptosis of HSV-1-infected iDCs are not fully understood. Previously, we have shown that HSV-1-induced apoptosis of iDCs is associated with downregulation of the cellular FLICE-inhibitory protein (c-FLIP), a potent inhibitor of caspase-8-mediated apoptosis. In this study, we prove that HSV-1 induces degradation of c-FLIP in a proteasome-independent manner. In addition, by using c-FLIP-specific small interfering RNA (siRNA) we show for the first time that downregulation of c-FLIP expression is sufficient to drive uninfected iDCs into apoptosis, underlining the importance of this molecule for iDC survival. Surprisingly, we also observed virus-induced c-FLIP downregulation in epithelial cells and many other cell types that do not undergo apoptosis after HSV-1 infection. Microarray analyses revealed that HSV-1-encoded latency-associated transcript (LAT) sequences, which can substitute for c-FLIP as an inhibitor of caspase-8-mediated apoptosis, are much less abundant in iDCs as compared to epithelial cells. Finally, iDCs infected with an HSV-1 LAT knockout mutant showed increased apoptosis when compared to iDCs infected with the corresponding wild-type HSV-1. Taken together, our results demonstrate that apoptosis of HSV-1-infected iDCs requires both c-FLIP downregulation and diminished expression of viral LAT." @default.
- W2155706994 created "2016-06-24" @default.
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- W2155706994 date "2010-01-15" @default.
- W2155706994 modified "2023-10-18" @default.
- W2155706994 title "Herpes Simplex Virus Type 1 (HSV-1)-Induced Apoptosis in Human Dendritic Cells as a Result of Downregulation of Cellular FLICE-Inhibitory Protein and Reduced Expression of HSV-1 Antiapoptotic Latency-Associated Transcript Sequences" @default.
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- W2155706994 doi "https://doi.org/10.1128/jvi.01409-09" @default.
- W2155706994 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2798353" @default.
- W2155706994 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19906927" @default.
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