Regulation of cholinergic gene expression by the neuron restrictive silencer factor/repressor element-1 silencing transcription factor - PubMed (original) (raw)
Regulation of cholinergic gene expression by the neuron restrictive silencer factor/repressor element-1 silencing transcription factor
Louis B Hersh et al. Life Sci. 2003.
Abstract
The role of protein kinase A in regulating transcription of the cholinergic gene locus, which contains both the vesicular acetylcholine transporter gene and the choline acetyltransferase gene, was investigated in PC12 cells and a protein kinase A deficient PC12 mutant, A126.1B2 in which transcription of the locus is reduced. The site of action of protein kinase A was localized to a neuron restrictive silencer element/repressor element-1 (NRSE/RE-1) within the upstream region of the cholinergic gene locus. The neuron restrictive silencer factor/repressor element-1 silencing transcription factor (NRSF/REST), the transcription factor which binds to NRSE/RE-1, was expressed at similar levels in both PC12 and A126.1B2. Although nuclear extracts containing NRSF/REST from A126.1B2 exhibited binding to NRSE/RE-1, nuclear extracts from PC12 cells did not. The NRSF/REST isoform repressor element-1 silencing transcription factor-4 (REST4) was found to be expressed in PC12 cells, but not in the protein kinase A deficient PC12 cell line. REST4 inhibited the binding of NRSF/REST to NRSE/RE-1 as determined by gel mobility shift assays. Co-immunoprecipitation was used to demonstrate interaction between NRSF/REST and REST4. Expression of recombinant REST4 in the protein kinase A deficient PC12 cell line was sufficient to transcriptionally activate the cholinergic gene locus. Thus in PC12 cells protein kinase A promotes the production of REST4, which in turn de-represses of the cholinergic gene locus by inactivating the transcription repressor NRSF/REST.
Copyright 2003 Elsevier Science Inc.
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