Vulnerable Dentate Gyrus Granule Cells in Neurodegeneration

Vulnerable Dentate Gyrus Granule Cells in Neurodegeneration

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Vulnerable Dentate Gyrus Granule Cells in Neurodegeneration</th>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:2000089](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)</td>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:2000089](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)</td>
</tr>
</table>

Vulnerable Dentate Gyrus Granule Cells In Neurodegeneration is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Vulnerable Dentate Gyrus Granule Cells in Neurodegeneration

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Vulnerable Dentate Gyrus Granule Cells in Neurodegeneration</th>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:2000089](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)</td>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:2000089](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)</td>
</tr>
</table>

Vulnerable Dentate Gyrus Granule Cells In Neurodegeneration is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

The dentate gyrus granule cells (DGCs) are the principal excitatory [neurons](/entities/neurons) of the dentate gyrus in the hippocampal formation. These small, densely packed neurons play critical roles in pattern separation, a cognitive process that distinguishes between similar memories. In neurodegenerative diseases, particularly [Alzheimer's disease](/diseases/alzheimers-disease) (AD), DGCs exhibit significant vulnerability that contributes to memory deficits. [@palmer2018]

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Taxonomy & Classification

External Database Links

• [Cell Ontology (CL:2000089)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)
• [OBO Foundry (CL:2000089)](http://purl.obolibrary.org/obo/CL_2000089)
• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)

Multi-Taxonomy Classification

Taxonomy Database Cross-References

External Database Links

• [Cell Ontology (CL:2000089)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_2000089)
• [OBO Foundry (CL:2000089)](http://purl.obolibrary.org/obo/CL_2000089)
• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)
• [Human Cell Atlas](https://www.humancellatlas.org/)

Neuroanatomy

Dentate gyrus granule cells are located in the granule cell layer of the dentate gyrus, which forms the input layer of the hippocampal trisynaptic circuit. Their axons, known as mossy fibers, project to CA3 pyramidal neurons. DGCs receive input from the entorhinal [cortex](/brain-regions/cortex) via the perforant path and are characterized by:

• Soma diameter: 10-15 μm
• Total dendritic length: ~3000 μm
• Spine density: High (estimated 10-15 spines per 10 μm)
• Axon: Mossy fibers with large, complex boutons

Molecular Markers

• Prox1: Homeobox transcription factor, definitive DGC marker
• Calbindin: Calcium-binding protein expressed in mature DGCs
• NeuN (RBFOX3): Neuronal nuclear antigen
• zif268 (EGR1): Activity-dependent immediate early gene
• NeuroD1: Neurogenic differentiation factor

Vulnerability in Alzheimer's Disease

DGCs show early pathological changes in AD:

Hyperphosphorylated Tau

• DGCs accumulate hyperphosphorylated tau in early AD
• [Tau](/proteins/tau) pathology begins in the [entorhinal cortex](/brain-regions/entorhinal-cortex) and spreads to DGCs
• Neurofibrillary tangles impair DGC function before cell death

Amyloid-Beta Effects

• [Aβ](/proteins/amyloid-beta) oligomers reduce DGC excitability
• Synaptic dysfunction precedes structural changes
• Impaired pattern separation in early AD correlates with DGC dysfunction

Neurogenesis Decline

• Adult hippocampal neurogenesis is reduced in AD
• Neural progenitor cell proliferation decreases
• Integration of new DGCs is impaired

Connectivity Changes

• Mossy fiber sprouting occurs in AD
• Aberrant connectivity contributes to hyperexcitability
• Denervation from entorhinal cortex inputs

Vulnerability in Other Neurodegenerative Diseases

Parkinson's Disease

• DGCs show tau pathology in PD with dementia
• Cognitive impairments correlate with hippocampal involvement
• [Alpha-synuclein](/proteins/alpha-synuclein) may affect DGC function

Temporal Lobe Epilepsy

• DGCs are particularly vulnerable to seizure-induced damage
• Mossy fiber sprouting is a hallmark of epileptogenesis
• Recurrent seizures accelerate neurodegenerative processes

Vascular Dementia

• Ischemic damage affects DGCs
• Vascular compromise impairs neurogenesis
• White matter lesions impact DGC connectivity

Electrophysiology

DGCs exhibit unique firing properties:

• Resting membrane potential: -85 to -70 mV
• Action potential threshold: -50 to -45 mV
• Firing pattern: Regular spiking with adaptation
• Input resistance: 150-300 MΩ
• Place field properties: Context-specific firing

Therapeutic Implications

Neuroprotective Strategies

• [NMDA receptor](/entities/nmda-receptor) modulation: Targeting excitotoxicity
• Antiamyloid therapies: Reducing Aβ burden
• Tau-targeted approaches: Preventing tau aggregation

Regenerative Approaches

• Neurogenesis enhancement: Growth factor therapy
• Stem cell transplantation: Replacing lost DGCs
• Activity-dependent stimulation: Environmental enrichment

Biomarker Potential

• DGC-specific proteins in CSF (e.g., neurogranin)
• Imaging markers for DGC integrity
• Functional connectivity changes

See Also

• [Cell Types Index](/cell-types)

Background

The study of Vulnerable Dentate Gyrus Granule Cells In Neurodegeneration has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data