Details for: CL0019022

Cell ID: CL0019022

Cell Name: endothelial cell of pericentral hepatic sinusoid

Description: An endothelial cell found in the centrilobular region hepatic sinusoid, near the central vein. The fenestrae of these cells are smaller but more numerous compared with those of endothelial cells near the periportal region of the hepatic sinusoid.

Synonyms: central venous hepatic sinusoidal endothelial cell, pericentral LSEC

Selected Context(s): Overall

Gene Significance Landscape

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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 endothelial cell of pericentral hepatic sinusoid 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 pericentral hepatic sinusoid. 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 pericentral hepatic sinusoid. 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 pericentral hepatic sinusoid. 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.
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Select a context for the target cell.
Target Cell for CSI:  endothelial cell of pericentral hepatic sinusoid (CL0019022)

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Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
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 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 pericentral hepatic sinusoid](/details-cell/CL0019022) is a specialized endothelial cell lining the liver sinusoids in the centrilobular region, adjacent to the central vein. Morphologically, these cells are distinguished by smaller but more numerous fenestrae compared to their periportal counterparts. **Overall**, the gene expression profile of this cell type is dominated by an exceptionally strong signature of mitochondrial genes, suggesting a state of high metabolic activity is a core, defining feature. This is complemented by the specific expression of genes involved in RNA processing, cytoskeletal organization, and innate immunity, which collectively support its critical roles in hepatic blood filtration and immune surveillance. ## Key Characteristics and Function The functional identity of the [endothelial cell of pericentral hepatic sinusoid](/details-cell/CL0019022) appears to be defined by several key biological processes, as indicated by its top marker genes. * **High Metabolic Activity:** The most prominent characteristic is a profound enrichment for genes involved in mitochondrial respiration. A large number of genes encoded by the mitochondrial genome show high expression specificity, including [ATP6](/details-gene/4508), [ND1](/details-gene/4535), [ND3](/details-gene/4537), [ND2](/details-gene/4536), [ND4](/details-gene/4538), [COX1](/details-gene/4512), and [CYTB](/details-gene/4519). This signature is further supported by nuclear-encoded mitochondrial components like [ATP5F1E](/details-gene/514) and [COX4I1](/details-gene/1327). This collective gene expression pattern is consistent with a high demand for ATP to fuel the cell's specialized functions, such as active transport and endocytosis. * **RNA Processing and Nuclear Organization:** The single most specific marker is the long non-coding RNA [NEAT1](/details-gene/283131), a core component of nuclear paraspeckles involved in post-transcriptional gene regulation. This is complemented by high specificity for RNA binding and splicing factors like [ARGLU1](/details-gene/55082), [RBM39](/details-gene/9584), and [HNRNPA2B1](/details-gene/3181). This suggests that complex, RNA-mediated regulatory networks are critical for establishing and maintaining the unique phenotype of these cells. * **Cytoskeletal Dynamics:** The specific expression of genes such as [MYL6](/details-gene/4637) (myosin light chain 6) and [CFL1](/details-gene/1072) (cofilin 1) points towards active cytoskeletal remodeling. This is essential for maintaining the unique architecture of these cells, particularly their characteristic fenestrae, which are crucial for the transfer of solutes and macromolecules between the sinusoidal blood and [hepatocytes](/details-cell/CL0000182). * **Innate Immunity and Scavenging:** These cells exhibit a distinct immunological profile. The high specificity scores for [FCN2](/details-gene/2220) and [FCN3](/details-gene/8547) (Ficolin-2 and Ficolin-3), which function as pattern recognition receptors in the lectin pathway of complement activation, underscore their role as scavenger cells that clear pathogens and cellular debris from the blood. The expression of [B2M](/details-gene/567), a component of MHC class I molecules, is also consistent with a role in antigen presentation and immune surveillance within the liver. * **Distinction from Parenchymal Cells:** The relatively low significance of genes encoding major plasma proteins typically synthesized by [hepatocytes](/details-cell/CL0000182), such as [ORM1](/details-gene/5004) and [APOA2](/details-gene/336), helps to molecularly distinguish these endothelial cells from the surrounding liver parenchyma. ## Clinical Significance and Contextual Roles **Overall**, the gene expression profile of pericentral hepatic sinusoidal endothelial cells highlights their central position in liver homeostasis and pathology. The profound metabolic signature suggests these cells are highly susceptible to metabolic stress or mitochondrial dysfunction, which are key factors in non-alcoholic fatty liver disease (NAFLD) and drug-induced liver injury that often exhibit zonal patterns. Their high energy state is likely required to support the detoxification activities of neighboring pericentral [hepatocytes](/details-cell/CL0000182). As key players in innate immunity, the specific expression of the ficolins [FCN2](/details-gene/2220) and [FCN3](/details-gene/8547) implicates them as first-line defenders against blood-borne pathogens and endotoxins. Dysfunction in this scavenging capacity can lead to systemic inflammation and is a critical event in the progression of liver fibrosis, where the loss of fenestrae ("capillarization") impairs their function. Furthermore, the expression of [HMGB1](/details-gene/3146), a potent damage-associated molecular pattern (DAMP), suggests these cells can actively participate in propagating sterile inflammation following hepatocellular injury. Disruption of cytoskeletal regulators like [MYL6](/details-gene/4637) and [CFL1](/details-gene/1072) may directly contribute to the defenestration observed in chronic liver disease and aging, which severely compromises liver function. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The exceptionally high and specific expression of a large suite of mitochondrial genome-encoded genes ([ATP6](/details-gene/4508), [ND1](/details-gene/4535), [ND2](/details-gene/4536)) indicates that pericentral hepatic sinusoidal endothelial cells possess an unusually high mitochondrial density and respiratory capacity. This heightened metabolic state is proposed to be a core specialization that powers their energy-demanding functions, including macromolecular scavenging via endocytosis and the dynamic cytoskeletal remodeling required for fenestrae maintenance. * **Surprising Findings:** It is remarkable that mitochondrial-encoded genes, often considered ubiquitous housekeeping genes, emerge as the most defining markers of specificity for this cell type. This suggests that the *quantitative* level of aerobic respiration is a primary determinant of this cell's unique identity, distinguishing it from other cells in the liver microenvironment. * **Testable Questions:** Does transmission electron microscopy of liver tissue reveal a significantly greater mitochondrial volume density in pericentral LSECs compared to periportal LSECs? Furthermore, would functional metabolic analysis (e.g., Seahorse assay) of isolated pericentral LSECs confirm a higher basal and maximal oxygen consumption rate relative to other endothelial subtypes? 2. **Hypothesis:** The status of the long non-coding RNA [NEAT1](/details-gene/283131) as the top specificity marker, along with other RNA processing factors like [ARGLU1](/details-gene/55082), suggests that post-transcriptional gene regulation via nuclear paraspeckle activity is a critical mechanism defining the specialized phenotype of pericentral LSECs. This regulatory layer may orchestrate the expression of zonally-specific proteins, including immune receptors ([FCN2](/details-gene/2220), [FCN3](/details-gene/8547)) and cytoskeletal components. * **Surprising Findings:** The prominence of a structural non-coding RNA as the most specific gene marker is unexpected and points towards a complex, RNA-centric regulatory hub, rather than a single transcription factor, as a master regulator of this cell's identity. * **Testable Questions:** Does siRNA-mediated knockdown of [NEAT1](/details-gene/283131) in an in-vitro LSEC model lead to a quantifiable change in the expression of other key pericentral markers like [FCN2](/details-gene/2220)? Additionally, does super-resolution microscopy show a higher abundance or distinct organization of nuclear paraspeckles in pericentral LSECs compared to other liver cell populations?