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- W2015647110 startingPage "2017" @default.
- W2015647110 abstract "The herpes simplex virus (HSV) amplicon vector is a powerful gene delivery vehicle that can accommodate up to 150 kilobase of exogenous DNA. However, amplicon-mediated transgene expression is often transient outside the nervous system. In order to define the role of host immune responses in silencing amplicon-encoded transgenes, we evaluated the kinetics of cytokine-/chemokine-expression after tail-vein injection of a luciferase-encoding amplicon into mice. Type I interferons (IFNs) were induced earliest, within an hour after injection, and several other cytokines/chemokines were subsequently upregulated in the livers of wild-type (WT) mice. When the same experiment was performed in signal transducers and activators of transcription 1 (STAT1)-knockout (KO) mice, the levels of type I IFN expression were significantly lower and chemokine induction was almost non-existent. Importantly, STAT1-KO mice exhibited significantly higher and more sustained luciferase activity than did the WT mice, which is attributable to increased transcriptional activity rather than increased copy numbers of luciferase-encoding vector DNA. Further studies using primary cultured fibroblasts derived from WT and STAT1-KO mice revealed the significance of STAT1 signaling in transcriptional silencing of the amplicon-encoded transgene in vitro. Our results indicate that type I IFNs induced by systemic delivery of HSV amplicon vectors initiate a cascade of immune responses and suppress transgene expression at the transcriptional level by activation of STAT1." @default.
- W2015647110 created "2016-06-24" @default.
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- W2015647110 date "2007-11-01" @default.
- W2015647110 modified "2023-10-16" @default.
- W2015647110 title "Early STAT1 Activation After Systemic Delivery of HSV Amplicon Vectors Suppresses Transcription of The Vector-encoded Transgene" @default.
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- W2015647110 doi "https://doi.org/10.1038/sj.mt.6300273" @default.
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