Dentate Gyrus Hilar Neurons in Neurodegeneration

Dentate Gyrus Hilar Neurons in Neurodegeneration

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Dentate Gyrus Hilar Neurons in Neurodegeneration</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:4023062](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4023062)</td>
</tr>
</table>

Dentate Gyrus Hilar Neurons In Neurodegeneration is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

The dentate gyrus hilus (CA4 region) contains specialized neurons that are selectively vulnerable in several neurodegenerative diseases, particularly Alzheimer's disease and temporal lobe epilepsy. [@fukumasu2021]

Overview

Dentate Gyrus Hilar Neurons in Neurodegeneration

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Dentate Gyrus Hilar Neurons in Neurodegeneration</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:4023062](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4023062)</td>
</tr>
</table>

Dentate Gyrus Hilar Neurons In Neurodegeneration is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

The dentate gyrus hilus (CA4 region) contains specialized neurons that are selectively vulnerable in several neurodegenerative diseases, particularly Alzheimer's disease and temporal lobe epilepsy. [@fukumasu2021]

Overview

The hilus (also called CA4) is the polymorphic layer of the dentate gyrus, containing diverse neuron types that serve as the main gateway for hippocampal circuit processing. [@jankord2010]

<!-- multi-taxonomy-enrichment -->

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

• Morphology: dentate gyrus neuron (source: Cell Ontology)
• Morphology can be inferred from Cell Ontology classification

External Database Links

• [Cell Ontology (CL:4023062)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4023062)
• [OBO Foundry (CL:4023062)](http://purl.obolibrary.org/obo/CL_4023062)
• [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/)

Hilar Neuron Types

Mossy Cells

• Morphology: Large cell bodies with extensive dendrites
• Function: Excitatory feedback to granule cells
• Markers: NPY, calretinin
• Vulnerability: Highly vulnerable in AD

Hilar Interneurons

• Types: HIPP, HICAP, MOPP cells
• Function: Inhibition of granule cells
• Markers: SOM, NPY, PV
• Preservation: Some types preserved in AD

Midget Cells

• Small neurons: GABAergic interneurons
• Function: Feedback inhibition
• Markers: Calbindin

Normal Function

Hippocampal Circuit

• Input: Mossy fiber input from granule cells
• Output: Feedback to molecular layer
• Processing: Pattern separation support

Memory Formation

• Computational role: Filtering redundant inputs
• Adult neurogenesis: Integration of new neurons

In Alzheimer's Disease

Mossy Cell Loss

• Early vulnerability: Mossy cells degenerate early
• Consequence: Disinhibition of granule cells
• Circuit dysfunction: Impaired pattern separation

Structural Changes

• Neuron loss: 40-70% reduction in AD
• Atrophy: Volume reduction of hilus
• Connection loss: Input/output disruption

Functional Implications

• Memory deficits: Especially spatial memory
• Epileptiform activity: Increased excitability
• Neurogenesis effects: Impact on new neurons

In Other Conditions

Temporal Lobe Epilepsy

• Selective vulnerability: Mossy cells die first
• Aberrant sprouting: Mossy fiber sprouting
• Hyperexcitability: Contributes to seizures

Aging

• Gradual decline: Normal age-related loss
• Functional changes: Memory impairment
• Increased vulnerability: To pathological insults

Molecular Mechanisms

Calcium Dysregulation

• Excitotoxicity: Excessive calcium influx
• Mitochondrial dysfunction: Energy failure
• Calpain activation: Proteolytic damage

Protein Aggregation

• Tau pathology: Neurofibrillary tangles
• Amyloid deposition: Limited in hilus
• Synaptic loss: Early synaptic dysfunction

Therapeutic Approaches

Neuroprotective Strategies

• Anticonvulsants: Prevent excitotoxicity
• Calcium channel blockers: Reduce calcium influx
• Neurotrophic factors: BDNF, GDNF

Circuit Restoration

• Stem cell transplantation: Replace lost neurons
• Optogenetic stimulation: Restore patterns
• Neuromodulation: Hippocampal stimulation

Cross-Links

• [Dentate Gyrus Granule Cells](/cell-types/dentate-gyrus-granule-cells)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Hippocampal CA1 Pyramidal Neurons](/cell-types/hippocampal-ca1-pyramidal-neurons)
• [Temporal Lobe Epilepsy](/diseases/epilepsy)
• [Hippocampal Circuit](/mechanisms/hippocampal-circuit)

Background

The study of Dentate Gyrus Hilar Neurons 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.

See Also

• [/diseases/alzheimers-disease](/diseases/alzheimers-disease)
• [Amyloid Hypothesis](/mechanisms/amyloid-hypothesis)
• [/mechanisms/tau-pathology](/mechanisms/tau-pathology)
• [APP Processing](/mechanisms/app-processing)
• [Amyloid Aggregation](/mechanisms/amyloid-aggregation)

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

Pathway Diagram

The following diagram shows the key molecular relationships involving Dentate Gyrus Hilar Neurons in Neurodegeneration discovered through SciDEX knowledge graph analysis: