Details for: CL1000413

Cell ID: CL1000413

Cell Name: endothelial cell of artery

Description: A blood vessel endothelial cell that is part of an arterial endothelium.

Synonyms: arterial endothelial cell

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 endothelial cell of artery 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 endothelial cell of artery. 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 endothelial cell of artery. 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 endothelial cell of artery. 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:  endothelial cell of artery (CL1000413)

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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 [endothelial cell of artery](/details-cell/CL1000413), also known as an arterial endothelial cell, is a specialized cell type forming the inner lining of arteries. **Overall**, the gene significance profile indicates that this cell is not merely a passive barrier but a highly active immunological and mechanosensitive interface. The high expression specificity of genes involved in antigen presentation, such as [B2M](/details-gene/567) and [HLA E](/details-gene/3133), underscores its role in vascular immune surveillance. Concurrently, a strong signature of cytoskeletal and calcium-binding protein genes, including multiple myosin light chains ([MYL12B](/details-gene/103910), [MYL12A](/details-gene/10627)), highlights its function in maintaining structural integrity and responding to the unique hemodynamic forces characteristic of the arterial environment. ## Key Characteristics and Function Analysis of top marker genes, ranked by expression specificity (`csi_z`), reveals several core functional clusters that define the arterial endothelial cell. * **Immune Surveillance and Antigen Presentation:** The most specific markers are components of the MHC class I antigen-presenting pathway. [B2M](/details-gene/567) (beta-2-microglobulin, CSI: 63.90) and the non-classical MHC molecule [HLA E](/details-gene/3133) (CSI: 62.09) exhibit exceptionally high specificity. This suggests that a primary, defining function of these cells is to continuously present endogenous peptides to circulating immune cells, likely playing a crucial role in monitoring for viral infections or cellular stress and interacting with both T cells and NK cells. * **Cytoskeletal Dynamics and Mechanotransduction:** A prominent group of highly specific genes is related to the cytoskeleton and cellular contractility. This includes multiple myosin regulatory light chains like [MYL12B](/details-gene/103910), [MYL12A](/details-gene/10627), and [MYL6](/details-gene/4637), as well as the actin-binding protein [CFL1](/details-gene/1072) (cofilin). This molecular machinery is essential for maintaining cell shape, managing cell-cell junctions, and transducing mechanical signals from blood flow (shear stress) into biochemical responses, which is critical for regulating vascular tone and remodeling. * **Calcium-Mediated Signaling:** The high specificity of calcium-binding proteins such as [S100A6](/details-gene/6277) (CSI: 51.66) and [CALM1](/details-gene/801) (calmodulin, CSI: 48.58) points to the central role of calcium as a second messenger in these cells. Calcium signaling in endothelial cells governs a wide range of functions, including the production of vasodilators like nitric oxide and the regulation of vascular permeability. * **High Metabolic and Biosynthetic Activity:** Several top markers are involved in fundamental cellular processes, suggesting a high basal metabolic rate. These include genes for iron storage ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)), protein ubiquitination ([UBC](/details-gene/7316)), protein transport ([SRP14](/details-gene/6727)), and translation ([EEF1D](/details-gene/1936)). The high specificity of translationally controlled tumor protein ([TPT1](/details-gene/7178), CSI: 56.55) is consistent with a cell type that must actively maintain its structural and functional integrity under constant physiological stress. * **Anti-Markers:** The genes with the lowest expression specificity are informative. For instance, the low `csi_z` score for the potent inflammatory cytokine [IL6](/details-gene/3569) suggests that, in a basal state, [endothelial cells of the artery](/details-cell/CL1000413) are not defining producers of this molecule. Similarly, the low specificity of the master endothelial transcription factor [ERG](/details-gene/2078) may indicate that while its expression is necessary, it is not uniquely high in this cell type compared to all others, reflecting its broad role across different endothelial subtypes. ## Clinical Significance and Contextual Roles The gene signature of arterial endothelial cells provides insights into their potential roles in vascular health and disease. The pronounced immune-related profile, dominated by [B2M](/details-gene/567) and [HLA E](/details-gene/3133), positions these cells as key players in vascular inflammation. In autoimmune diseases such as vasculitis, these cells could act as targets for autoreactive T cells. During viral infections, their ability to present viral antigens could trigger inflammatory responses that, if excessive, might contribute to endothelial dysfunction and vascular damage. The specific prominence of [HLA E](/details-gene/3133) suggests a specialized role in modulating NK cell activity within the vasculature, which could be critical in contexts like transplant rejection or atherosclerosis. The strong cytoskeletal signature ([MYL12B](/details-gene/103910), [CFL1](/details-gene/1072)) is directly relevant to atherosclerosis. Atherosclerosis preferentially develops in arterial regions with disturbed blood flow, which alters mechanical forces on the endothelium. The specific expression profile of these mechanosensitive genes likely represents an adaptation to high-flow arterial environments, and dysregulation of this machinery could be an early event in atherogenesis. Furthermore, the identification of [ITM2B](/details-gene/9445) as a specific marker is noteworthy. Mutations in this gene are known to cause familial British and Danish dementias, which are characterized by cerebral amyloid angiopathy ([Link](https://doi.org/10.1038/21637)). Its high specificity in arterial endothelial cells suggests a potential intrinsic role for these cells in the pathogenesis of certain neurovascular diseases involving protein aggregation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Arterial endothelial cells utilize the non-classical [HLA E](/details-gene/3133) pathway as a primary mechanism for immune surveillance, functioning to present a specific subset of peptides to maintain vascular tolerance and monitor for cellular stress, with a preferential role in regulating NK cell activation over conventional T cell responses. * **Surprising Findings:** The dominance of [HLA E](/details-gene/3133) over classical MHC class I molecules as a top specificity marker is unexpected. This suggests that the "immune face" of arterial endothelium is specialized for an immunoregulatory or innate-like monitoring function rather than broad adaptive immune antigen presentation. * **Testable Questions:** In co-culture systems, does shRNA-mediated knockdown of [HLA E](/details-gene/3133) in human arterial endothelial cells alter their susceptibility to NK cell-mediated lysis, and does this effect change when the endothelial cells are pre-treated with inflammatory cytokines like IFN-gamma? 2. **Hypothesis:** The highly specific expression of the calcium-binding protein [S100A6](/details-gene/6277) and multiple myosin light chains ([MYL12B](/details-gene/103910), [MYL12A](/details-gene/10627)) constitutes a specialized mechanotransduction module that allows arterial endothelial cells to translate high-shear stress into adaptive cytoskeletal stiffening and alignment, thereby preserving vascular integrity. * **Surprising Findings:** While the importance of mechanotransduction in endothelial cells is well-known, the high *specificity* (`csi_z`) of these particular components suggests they form a uniquely tuned toolkit for the arterial environment, distinguishing these cells from venous or capillary endothelium at a fundamental molecular level. * **Testable Questions:** Using atomic force microscopy, does CRISPR-Cas9-mediated knockout of [S100A6](/details-gene/6277) in cultured human arterial endothelial cells impair their ability to increase cortical stiffness and align in the direction of flow when exposed to physiological levels of laminar shear stress?