Details for: CL4023051

Cell ID: CL4023051

Cell Name: vascular leptomeningeal cell

Description: A transcriptomically distinct type of mesothelial fibroblast that is derived from the neural crest, is localized on blood vessels, and is a key component of the pia and arachnoid membranes surrounding the brain. The standard transcriptomic reference data for this cell type can be found on the CellxGene census under the collection: 'Transcriptomic cytoarchitecture reveals principles of human neocortex organization', dataset: 'Supercluster: Non-neuronal cells', Author Categories: 'CrossArea_subclass', clusters VLMC.

Synonyms: VLMC

Selected Context(s): Overall

Gene Significance Landscape

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for vascular leptomeningeal cell within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for vascular leptomeningeal cell. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for vascular leptomeningeal cell. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for vascular leptomeningeal cell. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

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Target Cell for CSI:  vascular leptomeningeal cell (CL4023051)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

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## Summary The **vascular leptomeningeal cell** ([vascular leptomeningeal cell](/details-cell/CL4023051)), or VLMC, is a specialized fibroblast-like cell type originating from the neural crest. It is a key structural component of the pia and arachnoid mater, the delicate inner membranes surrounding the brain, and is characteristically associated with blood vessels. Transcriptomic analysis reveals a surprisingly complex and active role for this cell, defined by the specific expression of a vast array of genes typically associated with neuronal signaling, ion transport, and synaptic adhesion. The high specificity score for [NRG3](/details-gene/10718), a neural growth factor, and [GRM8](/details-gene/2918), a metabotropic glutamate receptor, suggests that VLMCs are not merely structural but are equipped to actively sense and respond to the neurochemical environment of the central nervous system. ## Key Characteristics and Function **Overall**, the gene signature of the [vascular leptomeningeal cell](/details-cell/CL4023051) is dominated by genes integral to neuronal communication and excitability, suggesting a role far beyond simple structural support. * **Neurotransmitter and Ion Channel Signaling:** A prominent functional cluster includes numerous genes encoding neurotransmitter receptors and ion channels. This includes the metabotropic glutamate receptor [GRM8](/details-gene/2918), the AMPA glutamate receptor subunit [GRIA4](/details-gene/2893), and the GABA-A receptor subunit [GABRB1](/details-gene/2560). This suggests VLMCs can directly sense major excitatory and inhibitory neurotransmitters. Furthermore, the high specificity of voltage-gated potassium channels ([KCNIP4](/details-gene/80333), [KCND2](/details-gene/3751)), sodium channels ([SCN2A](/details-gene/6326)), and the hyperpolarization-activated channel [HCN1](/details-gene/348980) indicates that these cells may possess sophisticated mechanisms for regulating their own membrane potential in response to environmental cues. * **Synaptic-like Adhesion and Scaffolding:** The cellular identity is strongly defined by a suite of cell adhesion molecules primarily known for their roles at the synapse. These include [ADGRB3](/details-gene/577), [LRRTM4](/details-gene/80059), contactins ([CNTNAP5](/details-gene/129684), [CNTN1](/details-gene/1272)), and neurexin [NRXN3](/details-gene/9369). The additional expression of synaptic scaffolding proteins like [DLGAP1](/details-gene/9229) and proteins involved in synaptic vesicle dynamics like [SYT1](/details-gene/6857) and [ERC2](/details-gene/26059) further implies that VLMCs may form stable, complex junctions with neuronal or glial elements, contributing to the organization of the perivascular space. * **Growth Factor Signaling and Development:** The top marker, [NRG3](/details-gene/10718), is a ligand for the ErbB4 receptor, a pathway critical for neural development and oligodendrocyte survival ([Link](https://pubmed.ncbi.nlm.nih.gov/16478787/)). This, along with the high expression of the neurotrophin receptor [NTRK3](/details-gene/4916), positions VLMCs as a potential source of, or respondent to, crucial neurotrophic and developmental signals within the meninges. The expression of the transcription factor [MYT1L](/details-gene/23040) also points to a role in maintaining a specific, neuron-like cell fate. * **Metabolic Profile:** The anti-marker profile strongly suggests what this cell is not. The significant underrepresentation of multiple core mitochondrial genes involved in oxidative phosphorylation (e.g., [COX1](/details-gene/4512), [COX2](/details-gene/4513), [ATP6](/details-gene/4508), [ND1](/details-gene/4535)) indicates a relatively low basal metabolic rate compared to the highly active neurons and glia in the surrounding tissue. Similarly, the low relative expression of ubiquitous housekeeping genes like [HMGB1](/details-gene/3146) and [TPT1](/details-gene/7178) reinforces that the cell's defining features are its specialized signaling and adhesion functions, not its general cellular maintenance activities. ## Clinical Significance and Contextual Roles While this analysis covers the **Overall** context without comparison to a disease state, the specific gene signature of VLMCs points to their potential involvement in a range of neurological disorders. The high expression of genes with established links to channelopathies, neurodevelopmental disorders, and psychiatric conditions suggests that dysfunction in VLMCs could be a contributing factor to brain pathology. For instance, mutations in [SCN2A](/details-gene/6326) are a known cause of epileptic encephalopathies and autism spectrum disorders. The prominent role of this gene in VLMCs suggests that altered ion flux across the leptomeningeal-vascular interface could contribute to network hyperexcitability. Similarly, [GRM8](/details-gene/2918) has been investigated as a therapeutic target and risk gene for schizophrenia. The expression of these and other neuronal genes like [GABRB1](/details-gene/2560) and [NTRK3](/details-gene/4916) by VLMCs implies they are an integral part of the signaling environment that, when disturbed, could disrupt brain homeostasis. Their close association with the vasculature also suggests a potential role in blood-brain barrier dysfunction or neuroinflammatory processes that underpin many neurological diseases. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Vascular leptomeningeal cells function as non-neuronal "chemosensors" and "modulators" within the neurovascular unit, using a diverse array of neuronal-type receptors and ion channels to actively regulate the perivascular microenvironment. * **Surprising Findings:** It is highly unexpected for a cell of mesothelial fibroblast lineage to express such a specific and extensive toolkit for synaptic communication. The presence of canonical synaptic machinery like [SYT1](/details-gene/6857) (Synaptotagmin-1), [GRM8](/details-gene/2918) (glutamate receptor), and [GABRB1](/details-gene/2560) (GABA receptor) challenges the conventional view of these cells as passive structural elements. * **Testable Questions:** Can electrophysiological recordings of VLMCs in acute brain slices or co-cultures demonstrate membrane potential changes or calcium transients in response to direct application of neurotransmitters like glutamate and GABA? Does conditional knockout of [GRM8](/details-gene/2918) in VLMCs alter local cerebral blood flow in response to neuronal stimulation? 2. **Hypothesis:** VLMCs are critical regulators of neural development and maintenance at the brain's surface, secreting or responding to neurotrophic factors that influence nearby glial and neuronal populations. * **Surprising Findings:** The identification of [NRG3](/details-gene/10718), a ligand known to be vital for oligodendrocyte survival ([Link](https://pubmed.ncbi.nlm.nih.gov/16478787/)), as the top marker for VLMCs is a novel finding. This suggests a previously unappreciated link between the meninges and the health of myelinating glia in the underlying cortex. * **Testable Questions:** Does the targeted deletion of [NRG3](/details-gene/10718) in VLMCs result in observable defects in cortical myelination or oligodendrocyte precursor cell differentiation during postnatal development? Conversely, do VLMC-conditioned media promote the survival and maturation of cultured oligodendrocytes, and is this effect blocked by an ErbB4 inhibitor?