Hippocampal Granule Neurons

Hippocampal Granule Neurons

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Hippocampal Granule Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000120](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000120](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0001031](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0001031)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0001032](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0001032)</td>
</tr>
</table>

Hippocampal Granule Neurons 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.

Description: Principal excitatory neurons of the dentate gyrus that encode contextual memory and are affected in Alzheimer's disease and temporal lobe epilepsy. [@adult2020]

Overview

Hippocampal Granule Neurons

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Hippocampal Granule Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000120](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000120](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0001031](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0001031)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0001032](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0001032)</td>
</tr>
</table>

Hippocampal Granule Neurons 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.

Description: Principal excitatory neurons of the dentate gyrus that encode contextual memory and are affected in Alzheimer's disease and temporal lobe epilepsy. [@adult2020]

Overview

Hippocampal granule neurons, also known as dentate granule cells (DGCs), are the principal excitatory neurons of the dentate gyrus. They are the first hippocampal circuit node processing cortical information and are critical for pattern separation, episodic memory, and spatial navigation. [@pattern2018]

<!-- taxonomy-enrichment --> [@granule2021]

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

Multi-Taxonomy Classification

Taxonomy Database Cross-References

External Database Links

• [Cell Ontology (CL:0000120)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)
• [OBO Foundry (CL:0000120)](http://purl.obolibrary.org/obo/CL_0000120)
• [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/)

Taxonomy & Classification

External Database Links

• [Cell Ontology (CL:0000120)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000120)
• [OBO Foundry (CL:0000120)](http://purl.obolibrary.org/obo/CL_0000120)
• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)

Anatomical Properties

Location and Morphology

• Region: Dentate gyrus, hippocampal formation
• Layer: Granule cell layer (stratum granulosum)
• Morphology: Small, densely packed cell bodies
• Dendrites: Extend into molecular layer
• Axons: Mossy fibers to CA3

Connectivity

• Input: Entorhinal cortex (perforant path)
• Output: CA3 pyramidal neurons (mossy fibers)
• Interneurons: Local inhibition
• Modulation: Cholinergic, GABAergic

Vulnerability in Disease

Alzheimer's Disease

• Early involvement: Entorhinal cortex (EC) input disrupted
• Functional deficits: Pattern separation impairment
• Structural changes: Volume reduction
• Synaptic loss: Perforant path degeneration

Temporal Lobe Epilepsy

• Granule cell sprouting: Aberrant mossy fiber growth
• Hyperexcitability: Network dysfunction
• Memory impairment: Co-morbidity

Other Conditions

• Post-traumatic stress: Hyperactive granule cells
• Normal aging: Subtle dysfunction

Molecular Characteristics

Markers

• Prox1: Dentate granule cell marker
• Calbindin: Calcium binding protein
• NeuN: Neuronal nuclear antigen
• DCX: Doublecortin (immature)

Receptors

• NMDA: Synaptic plasticity
• AMPA: Fast excitation
• GABAa: Inhibition
• mGluR: Modulation

Adult Neurogenesis

Dentate Neurogenesis

• Source: Neural stem cells in subgranular zone
• Rate: ~700 new neurons/day (human)
• Maturation: 4-6 weeks to integration
• Function: Pattern separation, memory

Dysregulation in Disease

• AD: Reduced neurogenesis
• Epilepsy: Aberrant neurogenesis
• Depression: Suppressed neurogenesis
• Exercise: Enhanced neurogenesis

Research Models

In Vitro

• Primary cultures: Dissociated dentate gyrus
• Organotypic slices: Preserve circuitry
• iPSC-derived: Protocols in development

In Vivo

• Transgenic mice: Reporter lines
• Ablation models: Radiation, toxins
• Optogenetic: Circuit manipulation

Therapeutic Implications

Enhancing Function

• Pattern separation training: Cognitive intervention
• Neurogenesis enhancement: Exercise, diet
• Pharmacological: Antidepressants, NSAIDs

Protecting Neurons

• Neuroprotective compounds: In development
• Anti-epileptic: Prevent sprouting
• Nerve growth factors: BDNF, NGF

Background

The study of Hippocampal Granule Neurons 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.

Cross-References

• [Hippocampus](/brain-regions/hippocampus)
• Dentate Gyrus
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• Memory Circuits
• [Adult Neurogenesis](/investment/adult-neurogenesis)

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/) - Gene database
• [UniProt](https://www.uniprot.org/) - Protein database

Pathway Diagram

The following diagram shows the key molecular relationships involving Hippocampal Granule Neurons discovered through SciDEX knowledge graph analysis: