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- W2164149554 abstract "During functional neuronal differentiation of human SH-SY5Y neuroblastoma cells, induced by 12-O-tetradecanoylphorbol-13-acetate (TPA), the mRNA expression of c-fos and c-jun displayed a synchronous and biphasic type of induction for both mRNAs, with an early transient (30 to 120 min) and a later (> 8 h) more persistent increase. This was coupled to increased in vitro DNA binding activity of cFos/cJun AP-1 heterodimers in SH-SY5Y nuclear extracts using the electrophoretic mobility shift assay. Functional AP-1 activity was demonstrated in differentiating SH-SY5Y cells by transient transfection assays using a TPA-responsive reporter plasmid. The second expression phase of these protooncogenes was paralleled by a sustained induction of neuronal differentiation markers, as exemplified by growth-associated protein 43 and neuropeptide tyrosine (NPY) mRNAs. DNA-protein interaction between an evolutionarily conserved region (-73 to -45) of the human NPY promoter, containing potential binding sites for AP-1, AP-2, and Sp1, and nuclear extracts prepared from untreated and TPA-treated SH-SY5Y cells revealed one complex (CI) that was unaffected and three complexes (CII to CIV) that were induced by TPA treatment. Competition for DNA binding using AP-1, AP-2, and Sp1 consensus sequences and an anti-cJun antibody, respectively, revealed cooperative interactions between AP-1, AP-2, and Sp1 transcription factors and the NPY promoter. In addition, TPA-mediated induction of AP-2 DNA binding activity to the NPY promoter was not dependent on increased AP-2 mRNA expression. This high degree of complexity presumably involved in NPY gene expression during neuronal differentiation of SH-SY5Y cells suggests productive cooperative interactions between multiple transcription factors." @default.
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- W2164149554 date "1994-01-01" @default.
- W2164149554 modified "2023-09-23" @default.
- W2164149554 title "Activation of the human NPY gene during neuroblastoma cell differentiation: induced transcriptional activities of AP-1 and AP-2." @default.
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