Details for: CL0000077

Cell ID: CL0000077

Cell Name: mesothelial cell

Description: A flat, squamous-like epithelial cell of mesodermal origin. It forms the mesothelium, which lines the body's serous cavities including the pleural, peritoneal, and pericardial spaces. This cell plays a crucial role in synthesizing and secreting lubricants, such as glycosaminoglycans and surfactants, which minimize friction between adjacent tissues during movement.

Synonyms: mesotheliocyte

Selected Context(s): Overall

Gene Significance Landscape

Display Options
Score:
Display
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 mesothelial 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 mesothelial 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 mesothelial 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 mesothelial 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:  mesothelial cell (CL0000077)

 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.

Loading network (please wait)...

## Summary The [mesothelial cell](/details-cell/CL0000077) is a specialized epithelial cell of mesodermal origin that forms the lining of the body's serous cavities. The gene significance profile suggests its core identity is defined by an exceptionally high metabolic rate and a crucial role in immune surveillance. The top defining markers are dominated by components of the mitochondrial respiratory chain, such as [COX1](/details-gene/4512), and beta-2-microglobulin ([B2M](/details-gene/567)), the light chain of MHC class I molecules. This profile indicates that [mesothelial cells](/details-cell/CL0000077) are not merely a passive barrier but are highly active cells, critical for both maintaining a frictionless environment and interacting with the immune system. ## Key Characteristics and Function Analysis of the top marker genes, based on expression specificity (**Overall** context), reveals several core functional clusters that define the [mesothelial cell](/details-cell/CL0000077). * **Mitochondrial Respiration and High Energy Metabolism:** The most striking feature of the [mesothelial cell's](/details-cell/CL0000077) gene signature is the exceptional prominence of genes encoding components of the mitochondrial electron transport chain. Numerous subunits of Complex I ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [ND4](/details-gene/4538), [ND5](/details-gene/4540)), Complex III ([CYTB](/details-gene/4519)), and Complex IV ([COX1](/details-gene/4512), [COX2](/details-gene/4513)) are among the top markers. The high specificity scores ([csi_z](/)) for these genes suggest that the level of aerobic respiration in [mesothelial cells](/details-cell/CL0000077) is a uniquely defining characteristic compared to other cell types. This high metabolic activity is consistent with their primary function of synthesizing and secreting large quantities of lubricants like glycosaminoglycans. * **Antigen Presentation and Immune Surveillance:** The high significance of [B2M](/details-gene/567), an essential component of MHC class I molecules, underscores a key role in presenting endogenous antigens. This positions the [mesothelial cell](/details-cell/CL0000077) as a sentinel cell lining major body cavities, capable of signaling the presence of intracellular pathogens or malignant transformations to cytotoxic T lymphocytes. * **Cytoskeletal Organization and Membrane Integrity:** [EZR](/details-gene/7430) (Ezrin), a protein that links the cortical actin cytoskeleton to the plasma membrane, is a highly specific marker. This highlights the importance of structural integrity and the maintenance of cell shape and microvillar structures, which is critical for the function of a lining epithelium that must withstand mechanical forces and maintain a barrier. * **RNA Processing and Regulation:** The presence of long non-coding RNAs like [NEAT1](/details-gene/283131) and [SNHG29](/details-gene/125144), and the RNA helicase [DDX5](/details-gene/1655), points towards complex post-transcriptional gene regulation. This may be necessary to fine-tune the cell's synthetic and signaling functions. * **Polyamine Metabolism:** The high specificity of [SAT1](/details-gene/6303), the rate-limiting enzyme in polyamine catabolism, is notable. Polyamines are crucial for cell growth and differentiation, and tight regulation of their levels may be a key aspect of mesothelial homeostasis. The anti-marker profile is characterized by the low specificity of numerous genes involved in broad transcriptional regulation and chromatin modification, such as [ELF1](/details-gene/1997), [FOXP1](/details-gene/27086), and [CHD2](/details-gene/1106). This suggests that while these processes are active, they are not expressed at a uniquely high level that would define the cell's identity. Notably, the long non-coding RNA [LINC02877](/details-gene/152118) shows a strongly negative significance score, indicating it is specifically depleted in this cell type. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of [mesothelial cells](/details-cell/CL0000077) provides insight into their potential roles in pathology, particularly in the context of mesothelioma and peritoneal diseases. The prominent metabolic signature, defined by an arsenal of mitochondrial genes, suggests a high dependence on oxidative phosphorylation. This metabolic phenotype could represent a vulnerability in malignant mesothelioma, a cancer derived from these cells, potentially offering therapeutic targets distinct from those in cancers that rely more on glycolysis. The combination of a strong immune-surveillance potential ([B2M](/details-gene/567)) and structural integrity ([EZR](/details-gene/7430)) is clinically relevant. In cancer, downregulation of [B2M](/details-gene/567) is a known mechanism of immune evasion. Conversely, alterations in [EZR](/details-gene/7430) have been implicated in promoting metastasis by affecting cell adhesion and motility. The baseline expression of these genes in healthy [mesothelial cells](/details-cell/CL0000077) establishes a homeostatic state that is likely subverted during malignant transformation, leading to immune escape and dissemination of tumor cells within the serous cavities. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The uniquely high expression signature of mitochondrial respiratory chain genes (e.g., [COX1](/details-gene/4512), [ND5](/details-gene/4540)) in [mesothelial cells](/details-cell/CL0000077) is directly coupled to their specialized secretory function, providing the substantial ATP required for the synthesis and transport of lubricating molecules that maintain serosal integrity. This metabolic specialization could render them particularly susceptible to mitochondrial toxins or metabolic inhibitors. * **Surprising Findings:** The dominance of mitochondrial genes in a specificity-based analysis ([csi_z](/)) is unexpected for what might be considered a simple lining cell. This suggests that the bioenergetic capacity of [mesothelial cells](/details-cell/CL0000077) is not a mere housekeeping feature but a core specialization, distinguishing them from many other cell types. * **Testable Questions:** Does the targeted inhibition of oxidative phosphorylation in [mesothelial cell](/details-cell/CL0000077) cultures lead to a more profound and rapid decline in the secretion of hyaluronic acid and other glycosaminoglycans compared to other epithelial cell types, such as keratinocytes? 2. **Hypothesis:** [Mesothelial cells](/details-cell/CL0000077) function as a critical "first-line" immune sensor grid within serous cavities. Their high-level expression of [B2M](/details-gene/567) facilitates constant surveillance by cytotoxic T lymphocytes, while the robust cytoskeletal framework, indicated by [EZR](/details-gene/7430), may be essential for organizing the cell surface to ensure efficient and stable immunological synapse formation during antigen presentation. * **Surprising Findings:** For a non-professional antigen-presenting cell, the specificity score of [B2M](/details-gene/567) is remarkably high, ranking it as a top defining marker. This implies that antigen presentation may be a primary, rather than secondary, function of this cell type, critical for the immune homeostasis of the pleural, peritoneal, and pericardial spaces. * **Testable Questions:** Does siRNA-mediated knockdown of [EZR](/details-gene/7430) in [mesothelial cells](/details-cell/CL0000077) lead to a measurable reduction in the activation of antigen-specific [CD8-positive, alpha-beta T cells](/details-cell/CL0000625) in a co-culture assay, even when [B2M](/details-gene/567) expression remains unchanged?