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- W2101354311 abstract "MicroRNAs (miRs) have emerged as critical modulators of immune responses, but little is known about their transcriptional regulation and tissue specificity. miR-142 is specifically expressed in hematopoietic tissues and plays an important role in regulating immunity. In this study we identified the key transcriptional elements for regulation of miR-142 and its impact on TLR4-mediated expression of IL-6. The PU.1, C/EBPβ, and Runx1 transcription factor binding sites are conserved and constitutively occupied by the respective transcription factors in the miR-142 gene promoter only in the hematopoietic cells. Specific knockdown experiments in hematopoietic cells and rescue experiments in nonhematopoietic cells show that PU.1 is critical for miR-142 gene expression and that it synergizes with Runx1, C/EBPβ, and CBFβ. Furthermore, TLR4 stimulation enhanced miR-155 whereas experiments with knockdown and mimic expression of miR-155 demonstrated that miR-155 negatively regulates miR-142-3p expression by targeting PU.1. Thus, TLR4 stimulation represses PU.1, resulting in downregulation of miR-142 and increased expression of IL-6. These results collectively reveal the direct cis-acting sequences of miR-142 specific promoter and that transcription factor PU.1 is necessary for its exclusive expression in hematopoietic cells and regulation of IL-6." @default.
- W2101354311 created "2016-06-24" @default.
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- W2101354311 date "2013-03-15" @default.
- W2101354311 modified "2023-10-16" @default.
- W2101354311 title "PU.1-Dependent Transcriptional Regulation of miR-142 Contributes to Its Hematopoietic Cell–Specific Expression and Modulation of IL-6" @default.
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- W2101354311 doi "https://doi.org/10.4049/jimmunol.1202911" @default.
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