Details for: CL4033008

Cell ID: CL4033008

Cell Name: vein endothelial cell of respiratory system

Description: A(n) vein endothelial cell that is part of a(n) respiratory system.

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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Genes

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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 vein endothelial cell of respiratory system 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 vein endothelial cell of respiratory system. 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 vein endothelial cell of respiratory system. 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 vein endothelial cell of respiratory system. 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:  vein endothelial cell of respiratory system (CL4033008)

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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 [vein endothelial cell of respiratory system](/details-cell/CL4033008) is a specialized endothelial cell type lining the venous portion of the pulmonary vasculature. Based on its gene significance profile, this cell is not merely a passive conduit for blood but a highly active hub for post-transcriptional gene regulation, cytoskeletal dynamics, and immune surveillance. The high specificity scores (`csi_z`) for genes involved in RNA processing, such as the DEAD-box helicase [DDX5](/details-gene/1655), and immune modulation, like [HLA E](/details-gene/3133), suggest that its core identity is defined by its capacity to precisely control its molecular state and interact with the immune system. This positions it as a critical component in maintaining homeostasis at the blood-air barrier. ## Key Characteristics and Function **Overall**, the gene signature of the [vein endothelial cell of respiratory system](/details-cell/CL4033008) points towards a cell phenotype characterized by extensive regulation of gene expression, robust structural integrity, and active immune communication. * **RNA Processing and Transcriptional Regulation:** A dominant functional theme is the cell's investment in RNA biology. [DDX5](/details-gene/1655), the top marker by specificity (CSI Z-Score: 15.25), is an RNA helicase involved in alternative splicing and transcription regulation. This is strongly supported by the high significance of numerous other RNA-binding and processing genes, including the long non-coding RNA [NEAT1](/details-gene/283131), heterogeneous nuclear ribonucleoproteins ([HNRNPU](/details-gene/3192), [HNRNPA2B1](/details-gene/3181)), the splicing factor [SRSF5](/details-gene/6430), and the transcription coregulator [BTG1](/details-gene/694). This concerted signature suggests that fine-tuned control of mRNA splicing, stability, and export is a defining and crucial activity for these cells, likely enabling rapid adaptation to environmental cues. * **Cytoskeletal Dynamics and Cell Shape:** The cell exhibits a strong signature for maintaining and regulating its cytoskeleton. High specificity for myosin light chains ([MYL12A](/details-gene/10627), [MYL6](/details-gene/4637)) and the actin-depolymerizing factor [CFL1](/details-gene/1072) highlights the importance of cellular contractility and structural plasticity. This is consistent with the function of endothelial cells in regulating vascular tone, permeability, and responding to hemodynamic shear stress within the pulmonary veins. * **Immune and Inflammatory Modulation:** These cells appear to be actively engaged in immune dialogue. The high ranking of [HLA E](/details-gene/3133), a non-classical MHC class I molecule, suggests a primary role in regulating the activity of NK cells and a subset of T cells. Furthermore, the significance of [HMGB1](/details-gene/3146), a key alarmin released during cellular stress, and [TXNIP](/details-gene/10628), a regulator of the thioredoxin system and inflammasome activity, indicates that these cells are prepared to signal danger and modulate local inflammatory responses. * **Cellular Metabolism and Housekeeping:** High specificity for fundamental genes such as [GAPDH](/details-gene/2597), ferritin light and heavy chains ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)), and the mitochondrial gene [ND5](/details-gene/4540) underscores a high metabolic rate. The specific prominence of ferritin genes may point to a specialized role in iron handling within the lung, a critical process for both oxygen transport and managing oxidative stress. * **Anti-Markers:** The low significance of key Notch ligands, particularly [DLL4](/details-gene/54567) and [DLL1](/details-gene/28514), provides strong evidence that these cells are phenotypically distinct from arterial or angiogenic endothelial cells. This lack of a strong Notch signaling signature is consistent with a quiescent, mature venous identity, rather than a cell type actively involved in vessel sprouting or differentiation. ## Clinical Significance and Contextual Roles The gene profile of [vein endothelial cells of the respiratory system](/details-cell/CL4033008) implicates them in several physiological and pathological processes within the lung. The high specificity of [HMGB1](/details-gene/3146) expression is clinically relevant, as this protein is a well-established mediator in the pathogenesis of acute respiratory distress syndrome (ARDS) and sepsis. Its release from these endothelial cells could be a critical initiating event in lung inflammation and injury. The prominent role of iron-sequestering proteins [FTL](/details-gene/2512) and [FTH1](/details-gene/2495) suggests these cells may be involved in the response to pulmonary hemorrhage or iron-driven oxidative stress, which are features of various lung diseases. The unexpected high significance of [ITM2B](/details-gene/9445), a gene whose mutation is associated with familial British and Danish dementia ([Link](https://doi.org/10.1038/21637)), is intriguing. While its function in the lung endothelium is unknown, it is involved in processing of amyloid precursor protein, suggesting that these cells may have a role in handling or clearing protein aggregates from circulation, a function that could be compromised in systemic diseases. Finally, the strong [HLA E](/details-gene/3133) signature positions these cells as key regulators of immune cell trafficking and activation in the lung. Dysregulation of [HLA E](/details-gene/3133) expression could contribute to immune evasion by tumor cells or excessive inflammation during viral infections, making it a potential therapeutic target for lung cancer or viral pneumonia. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The defining characteristic of [vein endothelial cells of the respiratory system](/details-cell/CL4033008) is an advanced post-transcriptional regulatory network, orchestrated by RNA helicases ([DDX5](/details-gene/1655)) and lncRNAs ([NEAT1](/details-gene/283131)), which allows for rapid and precise modulation of the endothelial barrier and inflammatory responses to pathogens or hemodynamic changes. * **Surprising Findings:** The most specific molecular marker for this cell type is not a surface protein but an internal RNA-processing enzyme, [DDX5](/details-gene/1655). This suggests that the cell's unique identity is more defined by its regulatory capacity than by a static set of surface receptors. The high rank of [NEAT1](/details-gene/283131), a key component of nuclear paraspeckles, further implies that the spatial organization of transcription and RNA processing is a specialized feature. * **Testable Questions:** How does targeted inhibition of [DDX5](/details-gene/1655) in human pulmonary vein endothelial cells affect the alternative splicing of transcripts for key junctional proteins (e.g., VE-cadherin) or inflammatory cytokines following stimulation with lipopolysaccharide (LPS)? 2. **Hypothesis:** [Vein endothelial cells of the respiratory system](/details-cell/CL4033008) function as critical gatekeepers of immune homeostasis in the lung vasculature, primarily by expressing high levels of the NK cell-inhibitory ligand [HLA E](/details-gene/3133) to prevent unwarranted cytotoxicity, while retaining the ability to initiate inflammation via [HMGB1](/details-gene/3146) release upon significant stress or damage. * **Surprising Findings:** While endothelial cells are known to interact with immune cells, the exceptional specificity of [HLA E](/details-gene/3133) suggests this interaction is a primary, defining function rather than an ancillary one. Its prominence over classical antigen-presenting molecules (HLA-A, -B, -C) indicates a specialized role in innate, rather than adaptive, immune regulation. * **Testable Questions:** Does influenza virus infection of a co-culture system containing [vein endothelial cells of the respiratory system](/details-cell/CL4033008) and primary NK cells lead to a downregulation of endothelial [HLA E](/details-gene/3133) expression, thereby 'unmasking' the cells for NK-mediated clearance?