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• W2113562534 abstract "ABSTRACT Vesicular stomatitis virus (VSV) is a potent inducer of apoptosis in host cells. Recently, it has been shown that two VSV products are involved in the induction of apoptosis, the matrix (M) protein, and another viral product that has yet to be identified (S. A. Kopecky et. al., J. Virol. 75:12169-12181, 2001). Comparison of recombinant viruses containing wild-type (wt) or mutant M proteins showed that wt M protein accelerates VSV-induced apoptosis in HeLa cells, while wt M protein delays apoptosis in VSV-infected BHK cells. Our hypothesis to explain these results is that both effects of M protein are due to the ability of M protein to inhibit host gene expression. This hypothesis was tested by infecting cells with an M protein mutant virus defective in the inhibition of host gene expression (rM51R-M virus) in the presence or absence of actinomycin D, another inhibitor of host gene expression. Actinomycin D accelerated induction of apoptosis of HeLa cells infected with rM51R-M virus and delayed apoptosis in BHK cells infected with rM51R-M virus, similar to the effects of wt M protein. The idea that the induction of apoptosis by M protein in HeLa cells is due to its ability to inhibit host gene expression was further tested by comparing the activation of upstream caspase pathways by M protein versus that by actinomycin D or 5,6-dichlorobenzimidazole riboside (DRB). Expression of M protein activated both caspase-8 and caspase-9-like enzymes, as did treatment with actinomycin D or DRB. Induction of apoptosis by M protein, actinomycin D, and DRB was inhibited in stably transfected HeLa cell lines that overexpress Bcl-2, an antiapoptotic protein that inhibits the caspase-9 pathway. A synthetic inhibitor of caspase-8, Z-IETD-FMK, did not inhibit induction of apoptosis by M protein, actinomycin D, or DRB. Taken together, our data support the hypothesis that the induction of apoptosis by M protein is caused by the inhibition of host gene expression and that the caspase-9 pathway is more important than the caspase-8 pathway for the induction of apoptosis by M protein and other inhibitors of host gene expression." @default.
• W2113562534 created "2016-06-24" @default.
• W2113562534 creator A5030582650 @default.
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• W2113562534 date "2003-04-15" @default.
• W2113562534 modified "2023-10-17" @default.
• W2113562534 title "Contrasting Effects of Matrix Protein on Apoptosis in HeLa and BHK Cells Infected with Vesicular Stomatitis Virus Are due to Inhibition of Host Gene Expression" @default.
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• W2113562534 doi "https://doi.org/10.1128/jvi.77.8.4658-4669.2003" @default.
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