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• W4308221608 abstract "Background: Thyrotropin-releasing hormone (TRH) is primarily produced in the hypothalamus and regulates the thyrotropin secretion from the pituitary. TRH is distributed ubiquitously in the extrahypothalamic region, especially in pancreatic islets, while its physiological role remains nebulous. We have previously established a TRH-deficient mouse model, and showed impaired glucose tolerance and downregulated expression of fibroblast growth factor 21 (FGF21) in islets. Recent studies have demonstrated the physiological roles of pancreatic FGF21. Therefore, in this study, we elucidate the direct functions of TRH in pancreatic islets via the regulation of FGF21. Methods: To explore the functions of TRH in pancreatic islets, a microarray analysis using isolated islets from TRH-knockout mice was conducted. The regulatory mechanism of TRH in pancreatic FGF21 was investigated using islet cell lines; reverse transcription-quantitative polymerase chain reaction and Western blotting were used to determine the mRNA and protein expression levels of FGF21 in pancreatic islets and islet cell lines. Induction of FGF21 expression by TRH treatment was examined in vitro. To identify the transcription factors binding to the region responsible for TRH-induced stimulation of the FGF21 promoter, electromobility shift assays were conducted. Results: Among the detected and considerably changed genes in microarray, FGF21 was the most consistently downregulated in TRH-deficient mice islets. FGF21 was strongly co-expressed with insulin in mouse islets, and TRH stimulated endogenous Fgf21 mRNA expression in the islet cell line βHC9. The E-box site in the FGF21 promoter was responsible for TRH-induced stimulation via the extracellular signal-regulated kinase (ERK)1/2 signaling pathway. The transcription factor upstream stimulatory factor 1 (USF1) could specifically bind to the E-box site. Overexpression of USF1 increased FGF21 promoter activity. Conclusion: FGF21 was transcriptionally upregulated by TRH through the ERK1/2 and USF1 pathways in pancreatic β cells." @default.
• W4308221608 created "2022-11-09" @default.
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• W4308221608 date "2023-02-01" @default.
• W4308221608 modified "2023-10-18" @default.
• W4308221608 title "Role of Thyrotropin-Releasing Hormone in Regulating Fibroblast Growth Factor 21 in Mouse Pancreatic β Cells" @default.
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• W4308221608 doi "https://doi.org/10.1089/thy.2022.0144" @default.
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