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- W2023156937 abstract "IgA is transported into external secretions by the polymeric Ig receptor (pIgR). Interferon-gamma (IFN-gamma), a major regulator of pIgR expression, has been shown to increase pIgR mRNA levels in HT-29 human colon carcinoma cells. To determine the molecular mechanisms of pIgR regulation, genomic DNA containing the 5'-flanking region of the human pIgR gene was isolated and a single start site of transcription in human intestinal epithelial cells was identified. Using chimeric reporter plasmids containing flanking regions of the pIgR gene, a segment of the pIgR promoter which is necessary and sufficient for induction of transcription by IFN-gamma in HT-29 cells was identified. Significantly, the pIgR promoter contains three motifs homologous to the interferon-stimulated response element (ISRE), two in the 5'-flanking region and one in exon 1 of the pIgR gene. The upstream ISREs bind nuclear protein(s) which are constitutively expressed by HT-29 cells, while the exon 1 ISRE binds interferon regulatory factor-1 (IRF-1), following stimulation with IFN-gamma. Furthermore, induction of the IRF-1 promoter by IFN-gamma correlates with induction of the pIgR promoter by IFN-gamma. It has previously been demonstrated that induction of pIgR mRNA by IFN-gamma, requires de novo protein synthesis. It is now shown that IRF-1 is not detected in nuclear extracts from HT-29 cells stimulated with IFN-gamma in the presence of cycloheximide, suggesting that de novo synthesis of IRF-1 is required for induction of pIgR transcription by IFN-gamma." @default.
- W2023156937 created "2016-06-24" @default.
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- W2023156937 date "1997-01-01" @default.
- W2023156937 modified "2023-09-23" @default.
- W2023156937 title "Transcriptional regulation of the human polymeric immunoglobulin receptor gene by interferon-γ" @default.
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- W2023156937 doi "https://doi.org/10.1016/s0161-5890(96)00079-x" @default.
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