HDAC3 Protein

HDAC3 Protein

Overview

Hdac3 Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

Hdac3 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

...

HDAC3 Protein

Overview

Hdac3 Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

Hdac3 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Histone Deacetylase 3 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Histone Deacetylase 3</td></tr>
<tr><td><strong>Gene</strong></td><td>[HDAC3](/genes/hdac3)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[O15379](https://www.uniprot.org/uniprot/O15379)</td></tr>
<tr><td><strong>PDB Structure</strong></td><td>4A69, 4XBF, 5IX0</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>33 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Class I Histone Deacetylase</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/autoimmune" style="color:#ef9a9a">Autoimmune</a></td>
</tr>
<tr>
<td class="label">SciDEX Hypotheses</td>
<td><a href="/hypothesis/h-0e675a41" style="color:#ce93d8" title="Score: 0.56">Selective HDAC3 Inhibition with Cognitiv...</a><br><a href="/hypothesis/h-a9571dbb" style="color:#ce93d8" title="Score: 0.45">HDAC3-Selective Inhibition for Clock Res...</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">244 edges</a></td>
</tr>
</table>
</div>

Structure

HDAC3 is a 428-amino acid class I histone deacetylase. It contains a conserved catalytic domain with a zinc-binding motif (His-Asp-Asp-His). HDAC3 interacts with the NCoR and SMRT co-repressor complexes through its C-terminal region, which is essential for its deacetylase activity and recruitment to chromatin.

Normal Function

HDAC3 catalyzes the removal of acetyl groups from lysine residues on histones and non-histone proteins. As part of NCoR/SMRT complexes, HDAC3 represses gene expression involved in metabolism, inflammation, and circadian rhythm. In [neurons](/entities/neurons), HDAC3 regulates synaptic plasticity, memory formation, and neuronal survival. Its activity is dynamically regulated by phosphorylation and interaction with co-repressor complexes.

Role in Disease

| Disease | Mechanism | Evidence |
|---------|-----------|----------|
| Alzheimer's Disease | Dysregulated epigenetic control of memory and inflammatory genes. HDAC3 activity alters neuronal gene expression. | Post-mortem studies, animal models |
| Huntington's Disease | HDAC3 contributes to transcriptional dysregulation. HDAC3 inhibitors show therapeutic potential. | Mouse models |
| Multiple Sclerosis | Alters immune cell gene expression. | EAE models |
| Cancer | Overexpression in various cancers; HDAC3 inhibitors in clinical trials. | Clinical studies |

Therapeutic Targeting

• HDAC3 selective inhibitors: RGFP966, MS-275
• Pan-[HDAC](/entities/hdac-enzymes) inhibitors: Vorinostat, Panobinostat (FDA approved)
• Combination therapy: With DNA methyltransferase inhibitors

Key Publications

[HDAC3 structure and function](https://pubmed.ncbi.nlm.nih.gov/14690591/). Nat Rev Mol Cell Biol, 2004.

[HDAC3 in memory formation](https://pubmed.ncbi.nlm.nih.gov/18550811/). Cell, 2008.

[HDAC3 in Alzheimer's disease models](https://pubmed.ncbi.nlm.nih.gov/25363767/). Nat Neurosci, 2014.

[Epigenetics in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/28642202/). Nat Rev Neurosci, 2017.

Therapeutic Targeting

• HDAC3 selective inhibitors: RGFP966, MS-275 (entinostat)
• Pan-HDAC inhibitors: Vorinostat, Panobinostat (FDA approved for cancer)
• Combination therapy: With DNA methyltransferase inhibitors
• Neuroprotective potential: HDAC3 inhibition reduces excitotoxicity and oxidative stress in neurons

HDAC3 plays a critical role in regulating gene expression programs involved in [synaptic plasticity](/mechanisms/synaptic-dysfunction-pathway), [memory formation](/mechanisms/memory-formation), and neuronal survival. In [Alzheimer's disease](/diseases/alzheimers-disease), increased HDAC3 activity contributes to transcriptional dysregulation of memory-related genes. In [Huntington's disease](/diseases/huntington-disease), HDAC3 inhibition restores brain-derived neurotrophic factor (BDNF) expression and improves motor function in mouse models.

Selective HDAC3 inhibitors such as RGFP966 have shown promise in pre-clinical models of [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease), reducing [neuroinflammation](/mechanisms/neuroinflammation), improving synaptic integrity, and enhancing cognitive performance.

Role in Neurodegeneration

Alzheimer's Disease

HDAC3 contributes to AD pathogenesis through:

• Repression of memory-related gene programs in the [hippocampus](/brain-regions/hippocampus) and [prefrontal cortex](/brain-regions/prefrontal-cortex)
• Dysregulated epigenetic control of inflammatory genes in [microglia](/cell-types/microglia-neuroinflammation)
• Interaction with [amyloid-beta](/proteins/amyloid-beta)-induced transcriptional changes
• Modulation of [tau](/proteins/tau) phosphorylation through indirect effects on kinases

Parkinson's Disease

• HDAC3 activity affects dopaminergic neuron survival in the [substantia nigra](/brain-regions/substantia-nigra)
• HDAC3 inhibitors protect against MPTP-induced parkinsonism in mice
• Role in regulating alpha-synuclein expression and aggregation

Huntington's Disease

• HDAC3 contributes to transcriptional dysregulation through altered chromatin remodeling
• Brain-derived neurotrophic factor (BDNF) expression is suppressed by HDAC3 at the promoter
• HDAC3 inhibitors restore BDNF levels and improve motor function in R6/1 HD mice

Epigenetic Mechanisms

HDAC3 functions within multi-protein repression complexes:

• NCoR/SMRT complexes: HDAC3 recruitment to gene promoters through nuclear receptor corepressors
• Class I HDAC complexes: Association with REST CoREST complexes at neuronal gene promoters
• Non-histone targets: Transcription factors (FOXO, p53, NF-kB), cytoskeletal proteins, metabolic enzymes

The balance between histone acetylation and deacetylation regulates gene expression. HDAC3-mediated deacetylation promotes heterochromatin formation and gene silencing. In neurodegeneration, this often leads to repression of neuroprotective genes and activation of pro-inflammatory pathways.

See Also

• [HDAC3 Gene](/genes/hdac3)
• [Epigenetic Mechanisms](/mechanisms/epigenetic-regulation-neurodegeneration)
• [Memory Formation](/mechanisms/memory-formation)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Huntington's Disease](/diseases/huntington-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Proteins Index](/proteins)

External Links

• [UniProt — HDAC3 (O15379)](https://www.uniprot.org/uniprot/O15379)
• [Allen Brain Atlas — HDAC3 expression](https://portal.brain-map.org/)

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Selective HDAC3 Inhibition with Cognitive Enhancement](/hypothesis/h-0e675a41) — <span style="color:#ffd54f;font-weight:600">0.56</span> · Target: HDAC3
• [HDAC3-Selective Inhibition for Clock Reset](/hypothesis/h-a9571dbb) — <span style="color:#ffd54f;font-weight:600">0.45</span> · Target: HDAC3