Details for: CL0009089

Cell ID: CL0009089

Cell Name: lung pericyte

Description: A pericyte cell that is part of a lung.

Synonyms: lung pericyte cell, pulmonary pericyte

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

Image representation

Depiction of lung pericyte
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for lung pericyte 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 lung pericyte. 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 lung pericyte. 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 lung pericyte. 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:  lung pericyte (CL0009089)

 Legend
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 A [lung pericyte](/details-cell/CL0009089) is a mesenchymal cell type integral to the microvasculature of the lung, where it envelops capillaries and post-capillary venules. The gene significance profile for this cell type is dominated by markers of exceptionally high metabolic activity, particularly genes involved in mitochondrial respiration and iron homeostasis, such as [B2M](/details-gene/567), [FTH1](/details-gene/2495), and [COX1](/details-gene/4512). This signature suggests that the [lung pericyte](/details-cell/CL0009089) is a metabolically demanding cell, likely reflecting its crucial roles in regulating capillary blood flow, maintaining the integrity of the blood-air barrier, and responding to the unique physiological stresses of the pulmonary environment. ## Key Characteristics and Function **Overall**, the gene expression profile of the [lung pericyte](/details-cell/CL0009089) points to a cell with a highly active and specialized metabolism, coupled with structural and signaling capabilities essential for its role in the pulmonary microvasculature. * **Mitochondrial Bioenergetics:** A prominent feature of [lung pericytes](/details-cell/CL0009089) is the high significance of numerous genes encoding components of the mitochondrial electron transport chain. This includes multiple cytochrome c oxidase subunits ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX4I2](/details-gene/84701)) and other complex components like [CYTB](/details-gene/4519) and [ND2](/details-gene/4536). The high Z-scores for these genes suggest that robust aerobic respiration is a defining and essential function, likely providing the ATP required for contractile functions and maintenance of vascular tone. The specific high significance of the lung-associated isoform [COX4I2](/details-gene/84701) ([Link](https://doi.org/10.1016/s0378-1119(01)00385-7)) points towards tissue-specific adaptation of metabolic machinery. * **Iron Homeostasis and Oxidative Stress Response:** The high significance of both ferritin heavy chain ([FTH1](/details-gene/2495)) and light chain ([FTL](/details-gene/2512)) underscores the importance of iron metabolism. This is likely coupled to the high demand for iron as a cofactor in mitochondrial cytochromes. Furthermore, the significance of [GSTP1](/details-gene/2950), a key enzyme in glutathione conjugation, suggests these cells are equipped to handle high levels of oxidative stress, a constant challenge within the oxygen-rich lung environment. * **Cytoskeletal Dynamics and Contractility:** The significant expression of genes involved in cytoskeletal function, such as myosin light chain ([MYL6](/details-gene/4637)) and cofilin ([CFL1](/details-gene/1072)), is consistent with the known contractile nature of pericytes. This function is critical for regulating capillary diameter and, consequently, local blood flow and perfusion. * **Core Cellular Processes:** A suite of highly significant genes points to robust housekeeping functions, including protein synthesis ([EEF1D](/details-gene/1936), [SRP14](/details-gene/6727)), protein turnover ([UBC](/details-gene/7316)), and fundamental metabolism ([GAPDH](/details-gene/2597)). The high significance of Beta-2-microglobulin ([B2M](/details-gene/567)) indicates constitutive expression of MHC class I molecules, suggesting a capacity for antigen presentation and interaction with the immune system. * **Anti-Markers:** The profile of anti-markers is notable. While many mitochondrial genes are top markers, several others, such as [COX7C](/details-gene/1350), [UQCRB](/details-gene/7381), [COX6C](/details-gene/1345), and [NDUFA4](/details-gene/4697), are significantly underrepresented. This dichotomy suggests that [lung pericytes](/details-cell/CL0009089) do not simply have more mitochondria, but rather possess respiratory chain complexes with a specific, and perhaps unique, subunit composition. The low significance of genes involved in RNA processing, like [HNRNPC](/details-gene/3183) and [RBM39](/details-gene/9584), may indicate specialized post-transcriptional regulatory networks compared to other cell types. ## Clinical Significance and Contextual Roles **Overall**, the gene profile highlights the [lung pericyte](/details-cell/CL0009089) as a central player in lung homeostasis and pathology. Its high metabolic rate makes it a potential point of failure during metabolic stress, hypoxia, or inflammation, all of which are features of common lung diseases such as pulmonary fibrosis, acute respiratory distress syndrome (ARDS), and pulmonary hypertension. The cell's apparent role in managing oxidative stress via [GSTP1](/details-gene/2950) is clinically relevant, as pericyte dysfunction and detachment are known to contribute to vascular leakage and inflammation in the lung. The constitutive expression of [B2M](/details-gene/567) suggests that [lung pericytes](/details-cell/CL0009089) could be active participants in pulmonary immune surveillance, potentially presenting viral or endogenous antigens to CD8+ T cells, thereby influencing the course of infections or autoimmune processes in the lung. The significance of [CDH19](/details-gene/28513) underscores the importance of cell-cell adhesion in maintaining the structural integrity of the capillary wall. Dysregulation of pericyte-endothelial adhesion is a critical step in pathological angiogenesis and vascular remodeling seen in chronic lung diseases and cancer. ## Potential Mechanisms and Research Directions 1. **Hypothesis: [Lung pericytes](/details-cell/CL0009089) utilize an isoform-specific configuration of the mitochondrial respiratory chain to adapt to the unique oxygen tensions of the pulmonary microenvironment.** The data reveal a striking pattern where specific mitochondrial complex subunits are highly significant markers (e.g., [COX1](/details-gene/4512), [COX4I2](/details-gene/84701)), while others are significant anti-markers (e.g., [COX5B](/details-gene/1329), [COX6C](/details-gene/1345), [COX7C](/details-gene/1350)). This suggests a specialized assembly of respiratory complexes, possibly to optimize efficiency or function across a wide range of oxygen levels encountered in the lung. * **Surprising Findings:** The simultaneous positive and negative significance of genes within the same KEGG pathway (oxidative phosphorylation) is unexpected. It argues against a simple global increase in mitochondrial mass and instead points to a qualitative, compositional specialization of the bioenergetic machinery in these cells. * **Testable Questions:** How does the efficiency and reactive oxygen species (ROS) production of mitochondria isolated from [lung pericytes](/details-cell/CL0009089) compare to those from pericytes of other organs (e.g., brain, kidney) under both normoxic and hypoxic conditions? Furthermore, does silencing the lung-enriched isoform [COX4I2](/details-gene/84701) alter pericyte contractility and survival during hypoxic challenge? 2. **Hypothesis: [Lung pericytes](/details-cell/CL0009089) function as metabolic gatekeepers of the alveolar-capillary barrier, coupling iron sequestration with detoxification pathways to mitigate oxidative damage.** The high significance of the major iron storage proteins ([FTH1](/details-gene/2495), [FTL](/details-gene/2512]) and the key detoxifying enzyme [GSTP1](/details-gene/2950) suggests a coordinated defense mechanism. In this model, pericytes actively sequester free iron, a potent catalyst of ROS production, while simultaneously neutralizing oxidants, thereby protecting the adjacent, delicate endothelial and epithelial cells. * **Surprising Findings:** While pericytes are known to be supportive cells, the prominence of iron metabolism and detoxification genes at a level defining the cell's identity suggests this protective role may be a primary, rather than secondary, function in the context of the lung. * **Testable Questions:** In an in-vitro co-culture model, does depleting [FTH1](/details-gene/2495) or [GSTP1](/details-gene/2950) in [lung pericytes](/details-cell/CL0009089) render adjacent lung endothelial cells more susceptible to apoptosis and permeability changes when exposed to oxidative stressors like cigarette smoke extract or hyperoxia?