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- W2058092009 abstract "ABSTRACT Sindbis virus (SV), an enveloped virus with a single-stranded, plus-sense RNA genome, is the prototype alphavirus in the Togaviridae family. In mice, SV infects neurons and can cause apoptosis of immature neurons. Sphingomyelin (SM) is the most prevalent cellular sphingolipid, is particularly abundant in the nervous systems of mammals, and is required for alphavirus fusion and entry. The level of SM is tightly regulated by sphingomyelinases. A defect in acid sphingomyelinase (ASMase) results in SM storage and subsequent intracellular accumulation of SM. To better understand the role of the SM pathway in SV pathogenesis, we have characterized SV infection of transgenic mice deficient in the ASMase gene. ASMase knockout (ASM-KO) mice were more susceptible to SV infection than wild-type (WT) or heterozygous (Het) animals. Titers of SV were higher in the brains of ASM-KO mice than in the brains of WT mice. More SV RNA was detected by in situ hybridization, more SV protein was detected by immunohistochemistry, and more terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling-positive cells were present in the cortex and hippocampus of ASM-KO mice than in those of WT or Het mice. Interleukin-6 (IL-6), but not IL-1β or tumor necrosis factor alpha, was elevated in infected ASM-KO mice compared to levels in WT or Het mice, but studies with IL-6-KO mice and recombinant SV expressing IL-6 showed no role for IL-6 in fatal disease. Together these data indicate that the increase in susceptibility of ASM-KO mice to SV infection was the result of more-rapid replication and spread of SV in the nervous system and increased neuronal death." @default.
- W2058092009 created "2016-06-24" @default.
- W2058092009 creator A5040754947 @default.
- W2058092009 creator A5056170678 @default.
- W2058092009 date "2006-11-01" @default.
- W2058092009 modified "2023-10-18" @default.
- W2058092009 title "Acid Sphingomyelinase Deficiency Increases Susceptibility to Fatal Alphavirus Encephalomyelitis" @default.
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- W2058092009 doi "https://doi.org/10.1128/jvi.01154-06" @default.
- W2058092009 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1642146" @default.
- W2058092009 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16943298" @default.
- W2058092009 hasPublicationYear "2006" @default.
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