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- W2135398245 abstract "Summary Gαq plays a major role in platelet signal transduction, but little is known regarding its transcriptional regulation. We have reported that Gαq is upregulated during phorbol 12-myristate 13-acetate (PMA)-induced megakaryocytic transformation of human erythroleukemia (HEL) cells and regulated by EGR-1, an early growth transcription factor. These studies focused on the initial 238 bp of the 5’ upstream region of the Gαq gene. In the present studies we characterize a minimal region -1042/-1037 bp from ATG in the 5’ upstream of the Gαq promoter that is associated with PMA responsiveness. In luciferase reporter gene studies in HEL cells, Gαq 5’ upstream promoter sequence -1042/-1 showed an about four-fold increased activity in PMA-treated compared to untreated cells. Deletion of 6-nt-1042/-1037 eliminated the difference. Gel-shift studies on Gαq probe (-1042/-1012 bp) revealed binding of EGR-1 with PMA-treated but not untreated nuclear extracts, and this was dependent on the sequence –1042/-1037.Silencing of endogenous EGR-1 inhibited Gαq induction by PMA. MEK/ERK inhibitor U0126 blocked PMA effect on promoter activity of the -1042/-1 construct. In conclusion, EGR-1 binding to sequence –1042/-1037 bp in Gαq promoter mediates the induction of Gαq gene by PMA via the MEK/ERK signaling pathway. These studies provide the first evidence of a PMA-responsive element in Gαq promoter, and new insights into regulation of Gαq gene by EGR-1." @default.
- W2135398245 created "2016-06-24" @default.
- W2135398245 creator A5030817913 @default.
- W2135398245 creator A5038606972 @default.
- W2135398245 creator A5061115846 @default.
- W2135398245 date "2008-01-01" @default.
- W2135398245 modified "2023-10-18" @default.
- W2135398245 title "Phorbol 12-myristate 13-acetate (PMA) responsive sequence in Gαq promoter during megakaryocytic differentiation" @default.
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- W2135398245 doi "https://doi.org/10.1160/th08-07-0496" @default.
- W2135398245 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2688737" @default.
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