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Regulation of human tyrosine hydroxylase gene by neuron-restrictive silencer factor.

Authors
Kim, SM; Yang, JW; Park, MJ; Lee, JK; Kim, SU; Lee, YS; Lee, MA
Citation
Biochemical and biophysical research communications, 346(2):426-435, 2006
Journal Title
Biochemical and biophysical research communications
ISSN
0006-291X1090-2104
Abstract
Tyrosine hydroxylase (TH), the biosynthetic enzyme of catecholamine, is synthesized specifically in catecholaminergic neurons. Thus, it is possible that neuronal cell type-specific expression of this gene is coordinately regulated. One of the neuron-specific transcription regulators, neuron-restrictive silencer factor (NRSF)/repressor element 1 (RE1) silencing transcription factor (REST), represses the expression of neuronal genes in non-neuronal cells. To elucidate the molecular mechanisms that control catecholaminergic neuronal expression of human TH, we initially characterized the 5' regulatory region. Previous studies have shown that a 3174 bp fragment of the human TH promoter confers specific expression to the reporter gene in dopaminergic neuron-like cell lines. Within this 5' regulatory region, three putative neuron-restrictive silencer elements (NRSE)/RE1 were identified, which bound NRSF/REST in a sequence-specific manner, as confirmed using EMSA and ChIP assays. In transient transfection assays, deletion or mutation of NRSE/RE1 elements led to a 7-fold increase in activity of the 3.2 kb TH promoter in human neural stem cells (NSCs), but had no major effects on differentiated neuron-like cells. Suppression of NRSF/REST functions with either the histone deacetylase inhibitor, trichostatin, or DN-NRSF induced TH promoter activity. Our data strongly suggest that NRSF/REST functions as a repressor of TH transcription in NSCs via a mechanism dependent on the TH NRSE/RE1 sites.
MeSH terms
Base SequenceCell DifferentiationCell LineEnzyme ActivationGene Expression RegulationHistone Deacetylase InhibitorsHumansMutationNeurons/cytologyNeurons/metabolismPromoter Regions, GeneticProtein BindingRegulatory Elements, TranscriptionalRepressor Proteins/geneticsRepressor Proteins/physiology*Stem Cells/cytologyStem Cells/metabolismTranscription Factors/geneticsTranscription Factors/physiology*Transcriptional ActivationTyrosine 3-Monooxygenase/biosynthesis*Tyrosine 3-Monooxygenase/genetics
DOI
10.1016/j.bbrc.2006.05.142
PMID
16764822
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Neurology
Journal Papers > School of Medicine / Graduate School of Medicine > Brain Science
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