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• W2098372009 abstract "1321N1 human astrocytoma cells express thromboxane A2 (TXA2) receptors (TP). However, physiological consequences of TXA2 signaling in glial cells remain unclear. Herein, we show that TXA2 promotes interleukin-6 (IL-6) biosynthesis in glial cells. A TP agonist, 9,11-dideoxy-9alpha,11alpha-methanoepoxy-prosta-5Z,13E-dien-1-oic acid (U46619), enhanced IL-6 production in both 1321N1 cells and cultured mouse astrocytes. It has been shown that IL-6 gene expression is regulated by various transcription factors. Among them, we found a significant increase in cyclic AMP-response element-binding protein (CREB) activity with its phosphorylation at Ser133 by U46619 in 1321N1 cells. Although U46619 increased IL-6 promoter activity, a mutation at cyclic AMP-response element (CRE) on the promoter clearly suppressed the effect, suggesting that CRE is involved in U46619-induced IL-6 expression. Furthermore, both CREB and IL-6 promoter activities were suppressed by SB203580 [4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)-1H-imidazole], a p38 mitogen-activated protein kinase (MAPK) inhibitor, and H89 [N-[2-(4-bromocinnamylamino)-ethyl]-5-isoquinoline], a protein kinase A (PKA) inhibitor, indicating involvements of p38 MAPK and PKA in CREB activation and IL-6 expression. To determine which G-proteins are implicated in the U46619-induced IL-6 synthesis, the interfering mutants of Galpha(q), Galpha12, or Galpha13 by were overexpressed in 1321N1 cells adenoviral approach. It is noteworthy that the Galpha(q) or Galpha13 mutant blocked the IL-6 production by U46619. The constitutively active mutant of Galpha(q), Galpha12, or Galpha13 enhanced IL-6 production, indicating that Galpha(q) and Galpha13 were involved in U46619-induced IL-6 production. In conclusion, TXA2 enhances the IL-6 biosynthesis via the PKA p38 MAPK/CREB pathway in 1321N1 cells. IL-6 induction depends on Galpha(q) and Galpha13 as well. This is the first report showing TP-mediated IL-6 production in glial cells." @default.
• W2098372009 created "2016-06-24" @default.
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• W2098372009 creator A5047953305 @default.
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• W2098372009 date "2005-06-20" @default.
• W2098372009 modified "2023-09-25" @default.
• W2098372009 title "Thromboxane A₂ Promotes Interleukin-6 Biosynthesis Mediated by an Activation of Cyclic AMP-Response Element-Binding Protein in 1321N1 Human Astrocytoma Cells" @default.
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• W2098372009 doi "https://doi.org/10.1124/mol.105.012922" @default.
• W2098372009 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15967875" @default.
• W2098372009 hasPublicationYear "2005" @default.
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