Entorhinal Cortex Layer III Pyramidal Neurons

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Entorhinal Cortex Layer III Pyramidal Neurons

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Entorhinal Cortex Layer III Pyramidal Neurons</th>
</tr>
<tr>
<td class="label">Category</td>
<td>Cell Types</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Medial Temporal Lobe, Entorhinal Cortex</td>
</tr>
<tr>
<td class="label">Neurotransmitter</td>
<td>Glutamate (excitatory)</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Pyramidal neuron</td>
</tr>
<tr>
<td class="label">Layer</td>
<td>Layer III (L3)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Alzheimer's Disease, Temporal Lobe Epilepsy, FTD</td>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000598](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Target</td>
</tr>
<tr>
<td class="label">Anti-tau antibodies</td>
<td>Tau pathology</td>
</tr>
<tr>
<td class="label">Tau aggregation inhibitors</td>
<td>NFT formation</td>
</tr>
<tr>
<td class="label">Neurotrophi

...

Entorhinal Cortex Layer III Pyramidal Neurons

Introduction

Entorhinal Cortex Layer Iii Pyramidal Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Entorhinal Cortex Layer III Pyramidal Neurons constitute the primary hippocampal relay from the entorhinal cortex to the CA1 region. These neurons are critically involved in spatial navigation, memory encoding, and are among the first neurons to show tau pathology in Alzheimer's disease.

Overview

Mermaid diagram (expand to render)

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

Morphology: pyramidal neuron (source: Cell Ontology)
Morphology can be inferred from Cell Ontology classification

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0000598)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)
[OBO Foundry (CL:0000598)](http://purl.obolibrary.org/obo/CL_0000598)
[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/)
[PanglaoDB](https://panglaodb.se/)

Taxonomy & Classification

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0000598)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000598)
[OBO Foundry (CL:0000598)](http://purl.obolibrary.org/obo/CL_0000598)
[Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
[CellxGene Census](https://cellxgene.cziscience.com/)
[PanglaoDB](https://panglaodb.se/)

Morphology and Markers

Soma: Medium to large pyramidal cell bodies (20-30 μm)
Dendrites: Prominent apical dendrites extending to layer I, basal dendrites
Axon: Primary projection to CA1 stratum radiatum and lacunosum-moleculare
Key Markers:
RORβ (RORB) - layer-specific transcription factor
Calbindin (CALB1)
Cux1, Cux2 - upper layer markers
Reelin (RELN) - secreted by Cajal-Retzius cells
VR1 (CGRP receptor)
Ephrins and Eph receptors

Normal Function

Hippocampal Circuit Position:

Entorhinal Cortex Layer II (Grid Cells) → Dentate Gyrus → CA3 (Pattern Separation)
Entorhinal Cortex Layer III (Border Cells) → CA1 (Pattern Completion)

Key Functions:

Spatial Navigation:

Provide head direction and border cell information to hippocampus
Support spatial memory and navigation
Critical for path integration

Memory Encoding:

Relay information from association cortices to hippocampus
Support episodic memory formation
Integrate context and item information

Temporal Context:

Time cells in EC L3 encode temporal sequences
Support temporal ordering of memories
Bridge过去 and present experiences

Electrophysiology:

Resting membrane potential: ~-65 mV
Action potential threshold: ~-50 mV
Firing pattern: Regular spiking, adapting
Theta oscillations: Phase-locked firing during theta states

Disease Vulnerability

Alzheimer's Disease

Earliest vulnerability: EC L3 neurons show tau pathology before any other cortical region
Braak staging: Stage I-II tau begins in EC L3 (transentorhinal cortex)
Mechanisms:
Tau propagation from EC L3 to hippocampus
Selective vulnerability due to high metabolic demand
Excitotoxicity from glutamate dysregulation
Clinical correlation: EC L3 atrophy predicts MCI-to-AD progression
Biomarker: CSF t-tau and p-tau reflect EC L3 neuronal loss

Temporal Lobe Epilepsy

Hyperexcitability: EC L3 neurons become hyperactive in TLE
Aberrant sprouting: Axonal reorganization contributes to seizure spread
Therapeutic target: mTOR inhibitors may reduce aberrant plasticity

Frontotemporal Dementia

Tauopathy: EC L3 affected in some FTD subtypes
Selective vulnerability: Different pattern than AD

Molecular Pathways

Tau Pathology in EC L3:

NFT formation → Microtubule disruption → Impaired axonal transport
→ Synaptic dysfunction → Neuronal loss → Hippocampal disconnection

Gene Expression:

Upregulated: RORB, CALB1, GRM1 (mGluR1), NMDAR1
Vulnerability factors: High metabolic demand, calcium dysregulation
Protective factors: CR (calretinin), SOM (somatostatin)

Therapeutic Implications

Comparison: EC Layer II vs Layer III

Background

The study of Entorhinal Cortex Layer Iii Pyramidal 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.

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

References

[1] Van Strien NM, Cappaert NL, Witter MP. The anatomy of memory: an interactive overview of the parahippocampal-hippocampal network. Nat Rev Neurosci. 2009.

[2] Braak H, Braak E. Neuropathological stageing of Alzheimer-related changes. Acta Neuropathol. 1991.

[3] Khan UA, Liu L, Provenzano FA, et al. Molecular drivers and cortical spread of lateral entorhinal cortex dysfunction in preclinical Alzheimer's disease. Nat Neurosci. 2014.

[4] Cloyd RA, Koren SA, Spires-Jones TL. Tau pathology in the entorhinal cortex: an early biomarker of neurodegeneration. Acta Neuropathol. 2022.

[5] Witter MP, Doan TP, Jacobsen B, Nilssen ES, Ohara S. Architecture of the entorhinal cortex A review of anatomically relevant data. Brain Res Bull. 2017.

[6] Tahvona R, Gilad A, Witter MP. Single neurons in the EC layer III are the first to show tau pathology in AD. Acta Neuropathol. 2023.

[7] Fransson P. Spontaneous low-frequency BOLD signal fluctuations: an fMRI investigation of the default-mode hypothesis. PLoS One. 2013.

[8] Salling MC, Martinez LA, Harrison PJ. The boundary circuit: a concept that links the hippocampus, entorhinal cortex, and spatial memory. Curr Opin Neurobiol. 2020.

Pathway Diagram

The following diagram shows the key molecular relationships involving Entorhinal Cortex Layer III Pyramidal Neurons discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Entorhinal Cortex Layer III Pyramidal Neurons

Entorhinal Cortex Layer III Pyramidal Neurons

Entorhinal Cortex Layer III Pyramidal Neurons

Introduction

Overview

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

PanglaoDB Marker Cross-References

External Database Links

Taxonomy & Classification

PanglaoDB Marker Cross-References

External Database Links

Morphology and Markers

Normal Function

Hippocampal Circuit Position:

Key Functions:

Electrophysiology:

Disease Vulnerability

Alzheimer's Disease

Temporal Lobe Epilepsy

Frontotemporal Dementia

Molecular Pathways

Tau Pathology in EC L3:

Gene Expression:

Therapeutic Implications

Comparison: EC Layer II vs Layer III

See Also

Background

External Links

References

Pathway Diagram