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• W2037293560 endingPage "2057" @default.
• W2037293560 startingPage "2047" @default.
• W2037293560 abstract "Alterations in brain serotonin levels are implicated in major depression and are regulated by tryptophan hydroxylase-2 (TPH2). To study its regulation, we measured TPH2 RNA by quantitative RT-PCR in differentiated serotonergic rat raphe RN46A and GH4C1 pituitary cells, which express TPH2. Upon calcium mobilization using KCl (40 mmol/L), TPH2 RNA was rapidly (1 h) and strongly (> 10-fold) induced in differentiated RN46A cells, but not in GH4C1 cells. This effect was blocked by actinomycin D, implicating transcriptional activation. Similarly, calcium ionophore ionomycin induced TPH2 RNA by threefold in RN46A cells. To address the promoter sites involved, the transcription start site was identified and a series of TATA-containing TPH2 promoter-luciferase constructs were analyzed. In differentiated RN46A cells, the TPH2 promoter was induced 2.5-fold by ionomycin, similar to its action on TPH2 RNA. By contrast, ionomycin had no effect on TPH2 promoter activity in GH4C1 cells or TPH2-negative L6 myoblasts. Ionomycin sensitivity was localized to within 88 bp of the start site, containing putative CCATT-enhancer binding protein element, activator protein-1 and -2 (AP-1, AP-2) elements. These results are the first to identify calcium-mediated regulation of the proximal TPH2 promoter as critical for cell-specific TPH2 expression." @default.
• W2037293560 created "2016-06-24" @default.
• W2037293560 creator A5002795098 @default.
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• W2037293560 creator A5016636799 @default.
• W2037293560 creator A5039178222 @default.
• W2037293560 creator A5079386866 @default.
• W2037293560 date "2007-12-01" @default.
• W2037293560 modified "2023-09-23" @default.
• W2037293560 title "Cell-type specific induction of tryptophan hydroxylase-2 transcription by calcium mobilization" @default.
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• W2037293560 doi "https://doi.org/10.1111/j.1471-4159.2007.04903.x" @default.
• W2037293560 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17868301" @default.
• W2037293560 hasPublicationYear "2007" @default.
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