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• W2022989917 abstract "Abstract Insulin-like growth factor-binding protein-4 (IGFBP-4) is expressed in MCF-7 human breast cancer cells, and treatment of these cells with 17β-estradiol (E2) resulted in induction of IGFBP-4 gene expression (&gt;3-fold) and protein secretion (&gt;6-fold). To identify genomic sequences associated with E2 responsiveness, the 5′-promoter region (−1214 to +18) of the IGFBP-4 gene was cloned into a vector upstream from the firefly luciferase reporter gene, and E2 induced a 10-fold increase in luciferase activity in MCF-7 cells transiently transfected with this construct. Deletion analysis of this region of the IGFBP-4 gene promoter identified two GC-rich sequences at −559 to −553 and −72 to −64 that were important for E2-induced trans-activation. Gel mobility shift assays using 32P-labeled −569 to −540 and −83 to −54 oligonucleotides from the IGFBP-4 gene promoter showed that Sp1 protein bound these oligonucleotides to form a retarded band, and the intensity of the band was competitively decreased after coincubation with unlabeled IGFBP-4-derived and consensus Sp1 oligonucleotides. Mutation of the GC-rich sites within these sequences resulted in loss of the retarded band formation. Wild-type human estrogen receptor did not bind directly to the IGFBP-4 oligonucleotides; however, human estrogen receptor enhanced Sp1-DNA binding in a concentration-dependent manner. The results of this study demonstrate that at least two GC-rich sequences at −559 to −553 and− 72 to −64 are required for induction of IGFBP-4 gene expression by E2 in MCF-7 cells." @default.
• W2022989917 created "2016-06-24" @default.
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• W2022989917 date "1999-06-01" @default.
• W2022989917 modified "2023-10-17" @default.
• W2022989917 title "Transcriptional Activation of Insulin-Like Growth Factor-Binding Protein-4 by 17β-Estradiol in MCF-7 Cells: Role of Estrogen Receptor-Sp1 Complexes*" @default.
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• W2022989917 doi "https://doi.org/10.1210/endo.140.6.6751" @default.
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