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- W1988997130 abstract "Interferon regulatory factor 3 (IRF-3) plays a crucial role in initiation and development of the IFN antiviral response. The expression level of human IRF-3 is thought to be closely related to antiviral state of cells. However, the mechanisms of the transcription regulation of IRF-3 have remained largely unknown. We previously reported that transcription factor E2F1 negatively regulates the basal transcriptional activity of IRF-3. Here we demonstrate that transcription factors Sp1 and Sp3 up-regulate the basal transcriptional activity of IRF-3 and increase IRF-3 expression at mRNA level. By transient transfection analysis we revealed that mutation of Sp1/NRF-1 binding site resulted in a profound reduction of IRF-3 promoter activity. Overexpression of Sp1 and Sp3, but not NRF-1, transactivated the IRF-3 promoter activity in reporter gene assays while knocking-down of endogenous Sp1 and Sp3 by a shRNA strategy markedly inhibited IRF-3 promoter activity. Chromatin immunoprecipitation (ChIP) assays showed that Sp1 and Sp3 interact with the IRF-3 promoter in vivo. These results suggest that basal expression level of IRF-3 is regulated by transcription factors Sp1 and Sp3." @default.
- W1988997130 created "2016-06-24" @default.
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- W1988997130 date "2012-06-01" @default.
- W1988997130 modified "2023-10-18" @default.
- W1988997130 title "Transcription factors Sp1 and Sp3 regulate basal transcription of the human IRF-3 gene" @default.
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- W1988997130 doi "https://doi.org/10.1016/j.biochi.2012.03.011" @default.
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