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Role of thyroid transcription factor-1 in transcriptional regulation of heme oxygenase-1.

Biochem. Biophys. Res. Commun.2018 Jan 29;496(1):147-152. Epub 2018 Jan 04
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摘要


Here, we report thyroid transcription factor 1 (TTF-1) as an important transcription factor for the expression of heme oxygenase-1 (HO-1). HO-1 is a well-known cytoprotective enzyme against inflammation. We observed that HO-1 co-expressed with TTF-1 in mouse hypothalamic cells. Results from luciferase and chromatin immunoprecipitation assays revealed that TTF-1 directly activated HO-1 transcription by binding to binding domains in the 5'-flanking region of the HO-1 gene. A proinflammatory cytokine, tumor necrosis factor-alpha (TNF-α), induced nuclear translocation of TTF-1 and increased binding affinity of TTF-1 to its binding sites on the HO-1 gene. HO-1 mRNA increased with TTF-1 overexpression but decreased with RNA interference of TTF-1 expression in rat astroglial C6 cells. Together with results showing involvement of TTF-1 in the TNF-α-induced increase in interleukin 1 beta and monocyte chemotactic protein 1 production, this study suggests that TTF-1 plays an important role in the mouse hypothalamus TNF-α-induced inflammatory response for regulating HO-1 gene expression.

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