Hippocampal Bistratified (BC/AS) Interneurons

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Hippocampal BC/AS Interneurons (Bistratified Cells)

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Hippocampal Bistratified (BC/AS) Interneurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0004247](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0004247)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0004247](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0004247)</td>
</tr>
</table>

Introduction

Hippocampal Bistratified (Bc As) Interneurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Bistratified (BC) cells, also known as axo-axonic suppressor (AS) cells, are somatostatin-expressing hippocampal interneurons that target the axon initial segment of pyramidal cells[@freund1996]. They provide critical feedforward inhibition and are relevant to neurodegenerative disease research[@palop2010]. [@palop2010]

Overview

...

Hippocampal BC/AS Interneurons (Bistratified Cells)

Introduction

Overview

Mermaid diagram (expand to render)

Hippocampal Bistratified Interneurons are specialized neurons in the brain that play important roles in neurological function and are relevant to neurodegenerative diseases. These neurons are involved in critical processes such as neurotransmitter regulation, autonomic control, or sensory processing. [@klausberger2008]

Dysfunction or degeneration of these neurons contributes to the pathogenesis of Alzheimer's disease, Parkinson's disease, and related neurodegenerative disorders through effects on neurotransmitter systems, cellular metabolism, or neural circuit function. [@somogyi1977]

--- [@rudy2001]

[@van2000]

Multi-Taxonomy Classification

Taxonomy Database Cross-References

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0004247)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0004247)
[OBO Foundry (CL:0004247)](http://purl.obolibrary.org/obo/CL_0004247)
[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:0004247)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0004247)
[OBO Foundry (CL:0004247)](http://purl.obolibrary.org/obo/CL_0004247)
[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/)

Location and Anatomy

BC/AS cells are located in the stratum oriens and stratum radiatum of hippocampal CA1[@klausberger2008]. Their dendrites receive input from both pyramidal cells (in stratum radiatum) and interneurons. Their defining feature is axonal projections to the axon initial segment (AIS) of CA1 pyramidal cells[@somogyi1977]. [@davies1980]

Molecular Markers

Somatostatin (SOM)

BC cells robustly express somatostatin, a neuropeptide that inhibits neurotransmitter release[@freund1996]. [@bakker2012]

Kv3.1 Expression

They express Kv3.1 potassium channels, enabling fast-spiking properties[@rudy2001]. [@wittner2005]

Other Markers

GAD67: Expressed for GABA synthesis[@klausberger2008]
Parvalbumin-: Typically do not express parvalbumin[@freund1996]
mGluR1a: Express metabotropic glutamate receptors[@van2000]

Physiological Properties

Fast-Spiking

BC cells can sustain high-frequency firing due to Kv3.1 channel expression[@rudy2001]. [@howard2005]

Feedforward Inhibition

They receive excitatory input from CA3 Schaffer collateral fibers and provide inhibition to pyramidal cell somata and axon initial segments[@pouille2001].

Synaptic Dynamics

Short-term depression: At BC-to-pyramidal cell synapses[@pouille2001]
Paired-pulse depression: Characteristic of their output synapses[@klausberger2003]

Function in Neurodegeneration

Alzheimer's Disease

BC cells are vulnerable to amyloid pathology[@palop2010]
Their dysfunction leads to disinhibition of pyramidal cells[@busche2008]
Somatostatin reduction in AD affects BC cell function[@davies1980]
May contribute to hippocampal hyperactivity in early AD[@bakker2012]

Temporal Lobe Epilepsy

BC cell loss contributes to hyperexcitability[@wittner2005]
Their targeting of AIS makes them critical for controlling pyramidal cell output[@howard2005]

Background

The study of Hippocampal Bistratified (Bc As) Interneurons 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

[NeuroLex - Bistratified Cell](http://neurolex.org/wiki/Bistratified_cell)
[Allen Brain Atlas - Hippocampal Interneurons](https://celltypes.brain-map.org/)

Pathway Diagram

The following diagram shows the key molecular relationships involving Hippocampal Bistratified (BC/AS) Interneurons discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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