Details for: CL0019018

Cell ID: CL0019018

Cell Name: blood vessel smooth muscle cell

Description: A smooth muscle cell that is part of any blood vessel.

Synonyms: smooth muscle cell of blood vessel

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

Contexts:

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 blood vessel smooth muscle 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 blood vessel smooth muscle 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 blood vessel smooth muscle 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 blood vessel smooth muscle 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.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  blood vessel smooth muscle cell (CL0019018)

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Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 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 [blood vessel smooth muscle cell](/details-cell/CL0019018) is a specialized contractile cell type integral to the structure and function of the vasculature. **Overall**, its gene significance profile highlights a core identity centered on cytoskeletal motor activity and calcium-dependent signaling, underscored by the high specificity of markers such as myosin light chain [MYL6](/details-gene/4637). Concurrently, the data reveal a pronounced signature of high metabolic activity, particularly in aerobic respiration, driven by numerous nuclear-encoded mitochondrial proteins. Intriguingly, the high `csi_z` score for [B2M](/details-gene/567), a component of the MHC class I complex, suggests a potentially significant, non-canonical role in immune surveillance within the blood vessel wall. ## Key Characteristics and Function The transcriptional identity of the [blood vessel smooth muscle cell](/details-cell/CL0019018) is defined by several key functional clusters. * **Contractile and Cytoskeletal Machinery:** The cell's primary function is defined by genes essential for contraction. [MYL6](/details-gene/4637) (CSI-Z: 10.92), a myosin alkali light chain, stands out as a top marker, confirming its role in microfilament motor activity [Link](https://doi.org/10.1016/s0021-9258(18)81895-6). This is complemented by high expression of genes regulating cytoskeletal dynamics, including [CFL1](/details-gene/1072) (cofilin), which is involved in actin filament turnover, and [MAP1B](/details-gene/4131), a microtubule-associated protein. This signature collectively points to a cell that is structurally robust and dynamically contractile. * **Calcium-Dependent Signaling:** Smooth muscle contraction is tightly regulated by intracellular calcium. This is reflected in the high specificity scores for multiple calcium ion binding proteins. [S100A6](/details-gene/6277) (CSI-Z: 9.69) and [TPT1](/details-gene/7178) (CSI-Z: 10.41) are prominent markers, suggesting their critical roles in mediating calcium signals that trigger the contractile apparatus. The significance of [CALM2](/details-gene/805) (calmodulin 2) further reinforces the centrality of calcium signaling pathways in this cell type's function. * **High Metabolic Activity and Energy Production:** The cell exhibits a strong signature of high metabolic demand, characterized by the specific expression of numerous nuclear-encoded components of the mitochondrial respiratory chain. Genes such as [NDUFA4](/details-gene/4697), [COX7C](/details-gene/1350), [UQCRB](/details-gene/7381), [ATP5F1E](/details-gene/514), and [COX6C](/details-gene/1345) all score as highly specific markers. This indicates a heavy reliance on aerobic respiration to generate the ATP required for sustained contractile tone and other cellular processes. * **Protein Homeostasis and Stress Response:** A high rate of protein synthesis and turnover appears to be a key feature, as indicated by the significance of ubiquitin genes ([UBC](/details-gene/7316), [UBB](/details-gene/7314)) and the translation elongation factor [EEF1B2](/details-gene/1933). Furthermore, the specific expression of [GSTP1](/details-gene/2950) (Glutathione S-Transferase Pi 1) and [SOD1](/details-gene/6647) (Superoxide Dismutase 1) suggests a robust capacity to handle reactive oxygen species, a common byproduct of high mitochondrial activity and a key factor in vascular environments. * **Immune System Interface:** The exceptional specificity of [B2M](/details-gene/567) (Beta-2-Microglobulin, CSI-Z: 11.43), an essential component of MHC class I molecules, is a striking feature for a non-hematopoietic cell. This suggests that antigen presentation may be a more specialized function of these cells than previously appreciated, potentially positioning them as important sentinels for reporting intracellular pathogens or stress signals to the adaptive immune system. The anti-marker profile provides critical context. Notably, several mitochondrially-encoded genes of the respiratory chain, such as [COX2](/details-gene/4513) and [COX3](/details-gene/4514), show negative CSI scores. This contrasts sharply with the positive scores for their nuclear-encoded counterparts and suggests a unique, tightly regulated stoichiometry of respiratory complex components in this cell type. ## Clinical Significance and Contextual Roles The gene signature of the [blood vessel smooth muscle cell](/details-cell/CL0019018) has direct implications for vascular health and disease. Its fundamental role in maintaining vascular tone means that dysregulation of its contractile machinery, governed by genes like [MYL6](/details-gene/4637) and calcium-binding proteins like [S100A6](/details-gene/6277), is central to the pathophysiology of hypertension and vasospastic disorders. The cell's high metabolic rate and reliance on mitochondrial function are critical for maintaining vascular integrity. However, this also makes it vulnerable to metabolic insults. The prominent expression of antioxidant enzymes like [GSTP1](/details-gene/2950) and [SOD1](/details-gene/6647) highlights an intrinsic defense mechanism against oxidative stress, a key driver of endothelial dysfunction and atherosclerosis. A failure in these protective systems could contribute to the development of vascular lesions. The unusually high specificity of [B2M](/details-gene/567) expression may be clinically significant in the context of vascular inflammation. In conditions such as atherosclerosis or viral infections affecting the vasculature (e.g., cytomegalovirus), these cells could act as prominent antigen-presenting cells, initiating or perpetuating local T cell-mediated inflammation. This could contribute to plaque instability in atherosclerosis or to the pathology of transplant vasculopathy, where immune recognition of vessel wall components is a key event. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Blood vessel smooth muscle cells utilize a distinct, imbalanced stoichiometry of mitochondrial respiratory subunits to fine-tune metabolic function.** * **Surprising Findings:** The most unexpected result is the diametrically opposed significance of nuclear- versus mitochondrial-encoded components of the electron transport chain. The high specificity of nuclear-encoded subunits like [NDUFA4](/details-gene/4697) and [COX7C](/details-gene/1350) contrasts with the negative significance of core mitochondrial-encoded subunits like [COX2](/details-gene/4513), [COX3](/details-gene/4514), and [ATP6](/details-gene/4508). This challenges the conventional view that all components of the respiratory chain are coordinately upregulated to meet high energy demand. * **Testable Questions:** Does the ratio of nuclear- to mitochondrial-encoded cytochrome c oxidase subunits change in [blood vessel smooth muscle cells](/details-cell/CL0019018) under hypoxic versus normoxic conditions, and how does this altered stoichiometry affect mitochondrial respiration efficiency and reactive oxygen species production? 2. **Hypothesis: Beyond a structural role, blood vessel smooth muscle cells function as specialized sentinels for the adaptive immune system within the vascular wall.** * **Surprising Findings:** The `csi_z` score for [B2M](/details-gene/567) is the highest of any gene marker provided, surpassing even canonical smooth muscle structural proteins. While MHC class I is expressed on nearly all nucleated cells, its extreme specificity in this context suggests its function is not merely housekeeping but a defining characteristic of this cell's identity, implying a specialized role in interacting with the immune system. * **Testable Questions:** Can virally infected or lipid-loaded [blood vessel smooth muscle cells](/details-cell/CL0019018) process and present antigens via MHC class I with sufficient efficiency to trigger proliferation and cytokine release from antigen-specific [CD8-positive, alpha-beta T cells](/details-cell/CL0000625) in an in vitro co-culture system?