Mast Cells

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Mast Cells

Introduction

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Mast Cells

Introduction

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Mast Cells</th>
</tr>
<tr>
<td class="label">Category</td>
<td>Cell Types</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Meninges, Choroid Plexus, Perivascular Space</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Tissue-Resident Innate Immune Cells</td>
</tr>
<tr>
<td class="label">Neurotransmitter</td>
<td>Histamine, Serotonin, Heparin</td>
</tr>
<tr>
<td class="label">Key Markers</td>
<td>Tryptase, Chymase, FcεRI, c-Kit</td>
</tr>
<tr>
<td class="label">Vulnerability</td>
<td>Alzheimer's Disease, Parkinson's Disease, Multiple Sclerosis, Migraine</td>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000097](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000097)</td>
</tr>
<tr>
<td class="label">Database</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology</td>
<td>[CL:0000097](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000097)</td>
</tr>
<tr>
<td class="label">Gene/Protein</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">KIT</td>
<td>High</td>
</tr>
<tr>
<td class="label">TPSAB1</td>
<td>High</td>
</tr>
<tr>
<td class="label">TPSB2</td>
<td>High</td>
</tr>
<tr>
<td class="label">CPA3</td>
<td>High</td>
</tr>
<tr>
<td class="label">HDC</td>
<td>High</td>
</tr>
<tr>
<td class="label">FCER1A</td>
<td>High</td>
</tr>
<tr>
<td class="label">GATA2</td>
<td>High</td>
</tr>
<tr>
<td class="label">MRGPRX2</td>
<td>Medium</td>
</tr>
<tr>
<td class="label">Gene/Protein</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">KIT</td>
<td>High</td>
</tr>
<tr>
<td class="label">TPSAB1</td>
<td>High</td>
</tr>
<tr>
<td class="label">TPSB2</td>
<td>High</td>
</tr>
<tr>
<td class="label">CPA3</td>
<td>High</td>
</tr>
<tr>
<td class="label">HDC</td>
<td>High</td>
</tr>
<tr>
<td class="label">FCER1A</td>
<td>High</td>
</tr>
<tr>
<td class="label">GATA2</td>
<td>High</td>
</tr>
<tr>
<td class="label">MRGPRX2</td>
<td>Medium</td>
</tr>
</table>

Mast Cells is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Mast cells are tissue-resident immune cells that play crucial roles in allergy, inflammation, and innate immunity. In the central nervous system, mast cells reside in the meninges, choroid plexus, and perivascular spaces, where they contribute to neuroinflammation, blood-brain barrier regulation, and have been implicated in neurodegenerative diseases including Alzheimer's, Parkinson's, and multiple sclerosis. [@nautiyal2008]

Overview

Multi-Taxonomy Classification

Taxonomy Database Cross-References

PanglaoDB Marker Cross-References

Unknown (PanglaoDB):

External Database Links

[Cell Ontology (CL:0000097)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000097)
[OBO Foundry (CL:0000097)](http://purl.obolibrary.org/obo/CL_0000097)
[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:0000097)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000097)
[OBO Foundry (CL:0000097)](http://purl.obolibrary.org/obo/CL_0000097)
[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

Mast cells have distinctive features:

Granules: Electron-dense cytoplasmic granules containing histamine, heparin, tryptase, chymase
Receptors: FcεRI (IgE receptor), c-Kit (stem cell factor receptor)
Size: 10-15 μm diameter
Shape: Round to ovoid with short villous projections
Tissue Distribution: Meninges > Choroid Plexus > Perivascular spaces

Key Genes and Proteins

Normal Function

CNS mast cells serve important functions:

Allergic Response: IgE-mediated degranulation triggers inflammation

Blood-Brain Barrier: Regulate BBB permeability

Wound Healing: Release VEGF, FGF for angiogenesis

Innate Immunity: Recognize pathogens via TLRs

Neuroimmune Signaling: Communicate with microglia and neurons

Disease Involvement

Alzheimer's Disease

Amyloid Interaction: Mast cells can internalize Aβ
Neuroinflammation: Release pro-inflammatory cytokines
Tau Pathology: Histamine may promote tau phosphorylation
Therapeutic Target: Antihistamines as potential AD treatment

Parkinson's Disease

Alpha-Synuclein: Mast cells may interact with α-syn
Neuroinflammation: Contribute to dopaminergic neuron loss
Gut-Brain Axis: Gut mast cells may influence PD progression

Multiple Sclerosis

Demyelination: Mast cell proteases degrade myelin
Relapse Severity: Mast cell counts correlate with disease activity
Therapeutic Target: Mast cell stabilizers in MS treatment

Migraine

CGRP Release: Mast cells release calcitonin gene-related peptide
Vasodilation: Histamine contributes to migraine aura
Therapeutic Target: Mast cell inhibitors for migraine prevention

Molecular Mechanisms

Neuroinflammatory Signaling

Mast cells are potent neuroinflammation mediators:

Tryptase release: Mast cell tryptase activates PAR2 on neurons and astrocytes, triggering inflammatory cascades
Histamine signaling: Mast cell histamine affects blood-brain barrier permeability
Cytokine production: Mast cells produce TNF-α, IL-1β, IL-6, and CCL2, recruiting microglia

Oxidative Stress

Mast cells contribute to oxidative stress:

NADPH oxidase: Mast cell NADPH oxidase produces reactive oxygen species
Peroxidase activity: Myeloperoxidase generates hypochlorous acid

Blood-Brain Barrier Modulation

Mast cells directly affect BBB integrity:

Tight junction disruption: MMP-9 and tryptase degrade claudin-5 and occludin
Endothelial activation: VEGF from mast cells increases vascular permeability

Disease Involvement

Alzheimer's Disease

Mast cells play a role in Alzheimer's disease:

Amyloid interaction: Mast cells bind amyloid-beta via RAGE receptors
Neuroinflammation amplification: Mast cells amplify microglial IL-1β and TNF-α production
Plaque remodeling: Mast cell tryptase can degrade amyloid deposits

Parkinson's Disease

In Parkinson's disease:

BBB breakdown: Alpha-synuclein oligomers activate mast cells
Dopaminergic vulnerability: Mast cell histamine promotes dopaminergic neuron death
Gut-brain axis: Mast cells in the gut respond to alpha-synuclein aggregation

Multiple Sclerosis

Mast cells are implicated in multiple sclerosis:

Demyelination: Mast cell tryptase damages myelin
Autoimmune amplification: Mast cells present MOG antigens

Amyotrophic Lateral Sclerosis

Mast cells contribute to ALS:

Motor neuron inflammation: Mast cells cluster around motor neurons
Neuromuscular junction: Tryptase at the NMJ promotes axon degeneration

Therapeutic Implications

Drug Targets

Mast Cell Stabilizers: Cromolyn, ketotifen
Histamine Receptor Antagonists: H1R, H3R blockers
Tryptase Inhibitors: Protect against protease effects
c-Kit Inhibitors: Target mast cell survival

Clinical Applications

Migraine Prevention: Montelukast, cromolyn
MS Adjunct Therapy: Cromolyn in clinical trials
AD Research: Antihistamine epidemiology studies

Background

The study of Mast Cells 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

[Allen Brain Atlas: Mast Cells](https://mouse.brain-map.org/)

Pathway Diagram

The following diagram shows the key molecular relationships involving Mast Cells discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving Mast Cells discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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