Choroid Plexus Epithelial Cells - Expanded

Choroid Plexus Epithelial Cells - Expanded

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Choroid Plexus Epithelial Cells - Expanded</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000706](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000706](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:4301608](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4301608)</td>
</tr>
</table>

Introduction

Choroid Plexus Epithelial Cells Expanded 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

...

Choroid Plexus Epithelial Cells - Expanded

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Choroid Plexus Epithelial Cells - Expanded</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000706](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000706](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:4301608](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_4301608)</td>
</tr>
</table>

Introduction

Choroid Plexus Epithelial Cells Expanded 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

Choroid Plexus Epithelial Cells (CPECs) are specialized ependymal cells that form the blood-cerebrospinal fluid barrier (BCSFB). These cells are responsible for producing cerebrospinal fluid (CSF) and regulating the exchange of molecules between the blood and the CNS. [@johansson2013]

<!-- taxonomy-enrichment --> [@redzic2014]

<!-- multi-taxonomy-enrichment --> [@barake2018]

Multi-Taxonomy Classification

Taxonomy Database Cross-References

PanglaoDB Marker Cross-References

• Unknown (PanglaoDB):

External Database Links

• [Cell Ontology (CL:0000706)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)
• [OBO Foundry (CL:0000706)](http://purl.obolibrary.org/obo/CL_0000706)
• [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:0000706)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000706)
• [OBO Foundry (CL:0000706)](http://purl.obolibrary.org/obo/CL_0000706)
• [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/)

Cellular Architecture

Structure

• Location: Within choroid plexus villi in lateral, third, and fourth ventricles
• Morphology: Cuboidal epithelium with apical microvilli and basolateral infoldings
• Junctions: Tight junctions (claudin-1, claudin-2, occludin, ZO-1)
• Surface area: ~50% of total CSF-producing surface in humans

Key Proteins

• Transthyretin (TTR) — Primary CSF protein synthesized by CPECs
• Aquaporin 1 (AQP1) — Water channel for CSF secretion
• Na+/K+ ATPase — Ion transport
• Carbonic anhydrase II — CSF pH regulation
• Claudin-2 — Paracellular water channels

Primary Functions

CSF Production

• Produces ~500 mL of CSF daily in adults
• Active secretion via:

1. Na+/K+ ATPase pumping Na+ into CSF

Aquaporin-1 mediated water flow

Carbonic anhydrase activity

Cl- and HCO3- transport

Barrier Function

• Tight junctions prevent paracellular diffusion
• Selective transporter-mediated transcellular passage
• Protects CNS from blood-borne substances

Immune Surveillance

• CSF contains immune cells monitored by choroid plexus
• Gateway for peripheral immune cell entry
• Produces cytokines and chemokines

Role in Neurodegeneration

Alzheimer's Disease

Aβ clearance: Choroid plexus clears Aβ from CSF

TTR-Aβ interaction: Transthyretin binds Aβ, potential therapeutic

Barrier breakdown: Age-related BCSFB dysfunction

Inflammation: Increased pro-inflammatory cytokines

Parkinson's Disease

• Alpha-synuclein transport through CSF
• Choroid plexus as potential entry point for pathogens
• Altered protein clearance

Huntington's Disease

• Impaired CSF production
• Altered barrier permeability
• Reduced transthyretin levels

Amyotrophic Lateral Sclerosis

• Choroid plexus barrier dysfunction
• Altered immune cell trafficking
• CSF compositional changes

Multiple Sclerosis

• Altered BCSFB permeability
• Enhanced immune cell entry
• Cytokine dysregulation

Molecular Pathways

CSF Secretion

Inflammatory Pathways

• NF-κB activation: Pro-inflammatory cytokine production
• JAK/STAT signaling: Immune response modulation
• Complement activation: Alternative pathway involvement

Biomarker Potential

Choroid plexus-derived CSF biomarkers:

• Transthyretin: Decreased in AD, ALS
• Aβ isoforms: Diagnostic for AD
• Tau and p-tau: Neurodegeneration markers
• Cytokines: IL-6, TNF-α, IL-1β

Therapeutic Targets

Current Strategies

• Transthyretin stabilization: Diflunisal, tafamidis
• BCSFB modulation: Tight junction modifiers
• CSF flow enhancement: Surgical approaches

Emerging Approaches

• Gene therapy: AAV-mediated gene delivery
• Cell replacement: Stem cell-derived CPECs
• Nanoparticle delivery: Targeted CNS drug delivery via choroid plexus

Age-Related Changes

• Decreased CSF production (~0.07% per year)
• Tight junction integrity decline
• Reduced transepithelial transport
• Increased inflammation
• Choroid plexus calcification

Background

The study of Choroid Plexus Epithelial Cells Expanded 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.

Disease Associations

The choroid plexus produces CSF and is affected in Alzheimer's Disease, showing alterations in CSF dynamics and barrier function.

• [Blood-Brain Barrier](/mechanisms- [Microglia](/cell-types/microglia)barrier) Astrocytes
• [Microglia](/cell-types/microglia) Circumventricular Organs
• Cerebrospinal Fluid

External Links

• [Allen Brain Atlas: Choroid Plexus](https://portal.brain-map.org/)
• [CSF Research Foundation](https://www.csfresearchfoundation.org/)
• [Neuroscience Today: Choroid Plexus](https://neurosciencenews.com/choroid-plexus-1234/)