Infralimbic Cortex Pyramidal Neurons

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Infralimbic Cortex Pyramidal Neurons

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Infralimbic Cortex Pyramidal Neurons</th>
</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">Full Name</td>
<td>Infralimbic Cortex Pyramidal Neurons</td>
</tr>
<tr>
<td class="label">Abbreviation</td>
<td>IL</td>
</tr>
<tr>
<td class="label">Location</td>
<td>Medial prefrontal cortex, ventral to the prelimbic cortex, Brodmann area 32/25</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Glutamatergic pyramidal neurons</td>
</tr>
<tr>
<td class="label">Layer</td>
<td>Layer 2/3 and Layer 5</td>
</tr>
<tr>
<td class="label">Allen Atlas ID</td>
<td>Mouse: 170</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">CaMKIIα (Camk2a)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Vglut1 (Slc17a7)</td>
<td>High</td>
</tr>
<tr>
<td cl

...

Infralimbic Cortex Pyramidal Neurons

Introduction

Infralimbic Cortex 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.

Overview

Mermaid diagram (expand to render)

Infralimbic Cortex Pyramidal Neurons is a specialized neuronal population involved in emotion regulation and executive function. These neurons play critical roles in fear extinction, decision-making, and working memory and are vulnerable in various neurodegenerative diseases. [@sotresbayon2006]

Infralimbic Cortex (IL) Pyramidal Neurons

The Infralimbic Cortex (IL) is a medial prefrontal cortex region that plays a crucial role in emotional regulation, fear extinction, reward processing, and autonomic control. Located in the ventral portion of the prefrontal cortex, IL pyramidal neurons are key integrators of limbic and autonomic information. [@etkin2007]

[@holtzheimer2011]

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/)

Quick Facts

Morphology and Markers

Cellular Morphology

IL pyramidal neurons exhibit characteristic pyramidal morphology:

Triangular soma (15-25 μm diameter)
Apical dendrite extending toward the pial surface
Basal dendrites radiating laterally
Long apical shaft with extensive branching in Layer 1
Spiny dendrites receiving excitatory inputs

Molecular Markers

Key molecular markers for IL pyramidal neurons:

CaMKIIα - calcium/calmodulin-dependent protein kinase II, excitatory neuron marker
Vglut1 (Slc17a7) - vesicular glutamate transporter 1
Cux1 (Layer 2/3) - cut-like homeobox 1, upper layer marker
CTIP2 (Bcl11b) - Layer 5 marker
ER81 - transcription factor for subcortical projection neurons
FOXP2 - language/communication-related transcription factor

Normal Function

Fear Extinction

The Infralimbic Cortex is the primary cortical region for fear extinction:

Receives safety signals from the hippocampus and amygdala
Projects to the basal amygdala to inhibit fear responses
Critical for updating fear memories with new safety information
Lesions produce deficits in extinction recall

Emotional Regulation

IL plays a key role in regulating emotional responses:

Top-down control over amygdala reactivity
Inhibition of stress responses
Regulation of anxiety-like behaviors
Emotional processing of reward and punishment

Autonomic Control

Projects to hypothalamic autonomic centers
Regulates heart rate, blood pressure, and visceral function
Coordinates endocrine responses to stress
Mediates the cortical component of the autonomic nervous system

Reward Processing

Encodes reward prediction errors
Involved in reward-guided decision making
Projects to ventral striatum and pallidum
Modulates motivated behavior

Vulnerability in Neurodegenerative Diseases

Alzheimer's Disease

Early involvement: The IL shows early tau pathology in AD (Braak Stage III-IV)
Functional deficits: Reduced metabolism and hyperexcitability in early AD
Emotional symptoms: IL dysfunction contributes to anxiety, depression, and agitation
Autonomic dysfunction: Contributes to dysregulated stress responses and autonomic symptoms

Parkinson's Disease

Executive dysfunction: IL connectivity is disrupted, affecting decision-making
Impulse control disorders: IL dysfunction implicated in ICDs (gambling, shopping, hypersexuality) induced by dopamine agonists
Depression: IL hypometabolism common in PD depression
Autonomic symptoms: Contributes to autonomic dysfunction in PD

Frontotemporal Dementia

Primary target: The IL is heavily affected in behavioral variant FTD (bvFTD)
Disinhibition: IL degeneration contributes to impulsivity and inappropriate behavior
Emotional blunting: Loss of emotional regulation capacity
Loss of empathy: Social-emotional processing deficits

Huntington's Disease

Early involvement: IL shows early metabolic and functional changes
Emotional dysregulation: Contributes to irritability, aggression, and mood symptoms
Executive deficits: Disrupted prefrontal networks affect planning and decision-making

Transcriptomic Profile

Key differentially expressed genes in Infralimbic Cortex (from Allen Brain Atlas):

Therapeutic Implications

Transcranial Magnetic Stimulation

High-frequency rTMS to mPFC including IL may improve depression and anxiety
Target for treatment-resistant depression
Potential for cognitive enhancement in AD/PD

Deep Brain Stimulation

IL is being explored as a target for depression and OCD
Connections to downstream structures make it an attractive target

Pharmacological Approaches

SSRIs: Enhance IL function and fear extinction
NMDA antagonists: May enhance extinction learning
Dopamine agonists: Must be carefully managed to avoid ICDs

Connections

Afferent Inputs

Hippocampus (ventral CA1, subiculum)
Basolateral amygdala
Parabrachial nucleus (visceral sensory)
Thalamic mediodorsal nucleus

Efferent Projections

Basal amygdala (inhibitory control)
Ventral striatum (reward)
Hypothalamic nuclei (autonomic)
Periaqueductal gray (pain modulation)
Prelimbic Cortex Pyramidal Neurons
Anterior Cingulate Cortex Pyramidal Neurons
Medial Prefrontal Cortex
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Frontotemporal Dementia](/diseases/frontotemporal-dementia)

Background

The study of Infralimbic Cortex 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.

Disease Vulnerability

[Parkinson's Disease](/diseases/parkinsons-disease)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Frontotemporal Dementia](/diseases/frontotemporal-dementia)

References

[Prefrontal Cortex](/brain-regions/prefrontal-cortex)
Br- Parkinson's Disease
Executive Function Pathway

External Links

[BrainMaps Project](https://brainmaps.org/)
[Neuroscience Literature](https://pubmed.ncbi.nlm.nih.gov/)
[Allen Brain Atlas](https://brain-map.org/)

Pathway Diagram

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

Mermaid diagram (expand to render)

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