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- W2095410611 abstract "HES-1 is a vertebrate homologue of the Drosophila basic helix-loop-helix (bHLH) protein Hairy, a transcriptional repressor that negatively regulates neuronal differentiation. HES-1 expression in neuronal precursors precedes and represses the expression of the neuronal commitment gene MASH-1, a bHLH activator homologous to the proneural Achaete-Scute genes in Drosophila. Down-regulation of HES-1 expression in developing neuroblasts may be necessary for the induction of a regulatory cascade of bHLH activator proteins that controls the commitment and progression of neuronal differentiation. Here we show that the differentiation of embryonic day-17 rat hippocampal neurons in culture was coincident with a decline in HES-1 expression and DNA binding. Therefore, we examined the effect of forced expression of HES-1 and MASH-1 upon nerve growth factor (NGF) -induced differentiation in TrkA transfected hippocampal neurons. Expression of HES-1 inhibited both the intrinsic and NGF-induced neurite outgrowth, whereas MASH-1 expression increased neurite outgrowth. Strikingly, the increased hippocampal differentiation observed with MASH-1 expression is completely blocked by coexpression of HES-1. Furthermore, both wild-type HES-1 and a non-DNA binding mutant of HES-1 repressed MASH-1-dependent transcription activation. These results suggest that down-regulation of HES-1 is necessary for autonomous, growth facto- induced and MASH-1-activated hippocampal differentiation. J. Neurosci. Res. 56:229–240, 1999. © 1999 Wiley-Liss, Inc." @default.
- W2095410611 created "2016-06-24" @default.
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- W2095410611 date "1999-04-21" @default.
- W2095410611 modified "2023-10-11" @default.
- W2095410611 title "Regulation of hippocampal neuronal differentiation by the basic helix-loop-helix transcription factors HES-1 and MASH-1" @default.
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- W2095410611 doi "https://doi.org/10.1002/(sici)1097-4547(19990501)56:3<229::aid-jnr2>3.0.co;2-z" @default.
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