Journal
MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 339, Issue 1-2, Pages 72-80Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2011.03.016
Keywords
beta-Amyloid precursor protein; Thyroid hormone receptor; Transcriptional repression; Covalent histone modifications; Coactivators; Corepressors
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Funding
- Alzheimer's Association [IIRG-10-172578]
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Thyroid hormone (T3) suppresses cerebral gene expression of the beta-amyloid precursor protein (APP), an integral membrane protein that plays a key role in the onset and progression of Alzheimer's disease. However, the mechanisms by which T3 signaling pathways inhibit APP gene transcription in the brain remain unclear. By carrying out chromatin immunoprecipitation with neuroblastoma cells and primary rat brain tissue, we show for the first time that thyroid hormone receptors (TRs) directly bind at the APP gene in vivo at a promoter region containing a negative T3-response element. We further show that T3 treatment decreases both histone H3 acetylation and histone H3 lysine 4 methylation at the APP promoter and that chemical inhibitors of histone deacetylases and histone lysine demethylase abrogate T3-dependent APP silencing. Our findings thus suggest that TRs actively facilitate T3-dependent silencing of APP gene expression via the recruitment of distinct histone modifying enzymes associated with transcriptional repression. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
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