Details for: CL0002410

Cell ID: CL0002410

Cell Name: pancreatic stellate cell

Description: A cell that is found in the periacinar space of the exocrine pancreas and in perivascular and periductal regions of the pancreas, and has long cytoplasmic processes that encircle the base of the acinus. Expresses several intermediate filament proteins including vimentin and nestin. Shares many of the characteristics of hepatatic stellate cells, but not stellate cells of the central nervous system. Upon activation, this cell type undergoes morphological and gene expression changes that make the cell suggestive of being a type of myofibroblast.

Synonyms: PaSC, pancreas stellate cell

Selected Context(s): Overall

Gene Significance Landscape

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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 pancreatic stellate 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 pancreatic stellate 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 pancreatic stellate 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 pancreatic stellate 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:  pancreatic stellate cell (CL0002410)

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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 [pancreatic stellate cell](/details-cell/CL0002410) (PaSC) is a periacinar cell type within the exocrine pancreas, characterized by long cytoplasmic processes. The provided gene significance profile suggests that these cells are defined by an exceptionally high level of metabolic activity and a robust cytoskeletal infrastructure. The prominence of numerous mitochondrial respiratory chain components as top markers underscores a high energy demand, likely fueling the cell's myofibroblast-like functions, including protein synthesis and contractility, which are central to its role in tissue homeostasis and pathology. This profile is consistent with a cell that is metabolically primed for activation and matrix remodeling upon injury. ## Key Characteristics and Function **Overall**, the gene expression landscape of the [pancreatic stellate cell](/details-cell/CL0002410) is dominated by several distinct functional clusters, painting a picture of a cell with high bioenergetic capacity, a prominent contractile apparatus, and significant roles in protein and iron metabolism. * **Mitochondrial Bioenergetics:** A remarkably large number of the most specific marker genes for this cell type are core components of the mitochondrial electron transport chain. This includes multiple NADH:ubiquinone oxidoreductase subunits such as '[ND2](/details-gene/4536)', '[ND1](/details-gene/4535)', '[ND4](/details-gene/4538)', '[ND3](/details-gene/4537)', and '[NDUFA4](/details-gene/4697)', as well as cytochrome c oxidase subunit '[COX2](/details-gene/4513)' and cytochrome b '[CYTB](/details-gene/4519)'. The high specificity (high `csi_z` scores) of this entire pathway suggests that an elevated state of aerobic respiration is a defining feature of PaSCs, providing the necessary energy for their complex biological functions. * **Myofibroblast and Cytoskeletal Features:** Consistent with their description as having a myofibroblast-like potential, PaSCs show highly specific expression of genes involved in the cytoskeletal and contractile machinery. Key markers include '[MYL6](/details-gene/4637)' (myosin light chain 6) and '[MYL12A](/details-gene/10627)' (myosin regulatory light chain 12A), which are integral to actomyosin contractility. The actin-binding protein cofilin 1 ('[CFL1](/details-gene/1072)') further supports a role in dynamic cytoskeletal remodeling. * **Protein Synthesis and Metabolism:** The top marker, '[SRP14](/details-gene/6727)', is a component of the signal recognition particle essential for targeting secretory proteins to the endoplasmic reticulum, indicating a high capacity for protein synthesis and secretion. This is complemented by the high expression of '[UBE2D3](/details-gene/7323)', an E2 ubiquitin-conjugating enzyme, and '[DDX5](/details-gene/1655)', an RNA helicase, suggesting active protein turnover and post-transcriptional regulation. * **Iron Homeostasis and Stress Response:** PaSCs specifically express high levels of ferritin heavy and light chains, '[FTH1](/details-gene/2495)' and '[FTL](/details-gene/2512)', respectively. This points to a crucial role in iron storage and management, which is tightly linked to the high metabolic rate (iron being a key cofactor for mitochondrial enzymes) and the mitigation of oxidative stress. The expression of antioxidant enzymes like '[PRDX1](/details-gene/5052)' and the damage-associated molecular pattern (DAMP) protein '[HMGB1](/details-gene/3146)' further suggests these cells are equipped to handle and respond to cellular stress. The anti-marker profile helps refine the cell's identity. The low significance of genes like '[SPINK1](/details-gene/6690)', a pancreatic secretory trypsin inhibitor characteristic of acinar cells, confirms its distinct lineage from the exocrine secretory compartment. Similarly, the low specificity of the endothelial marker '[VWF](/details-gene/7450)' distinguishes it from vascular cells. ## Clinical Significance and Contextual Roles Although the analysis is performed in an **Overall** context without a direct disease comparison, the key marker genes strongly implicate [pancreatic stellate cells](/details-cell/CL0002410) in the pathogenesis of pancreatic diseases, particularly fibrosis and cancer. The activation of PaSCs into a proliferative, migratory, and extracellular matrix-secreting myofibroblast phenotype is a central event in the development of pancreatic fibrosis, a common feature of chronic pancreatitis and a key component of the desmoplastic stroma in pancreatic ductal adenocarcinoma. The highly specific expression of contractile proteins like '[MYL6](/details-gene/4637)' and '[MYL12A](/details-gene/10627)' provides a molecular basis for the tissue contracture and increased stromal stiffness observed in these conditions. Furthermore, the high expression of '[HMGB1](/details-gene/3146)', a potent alarmin released by stressed or necrotic cells, positions PaSCs as potential key players in initiating and sustaining sterile inflammation within the pancreas. Release of '[HMGB1](/details-gene/3146)' could create a feed-forward loop, promoting further PaSC activation and recruitment of immune cells. The robust iron-sequestering machinery ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) and antioxidant capacity ([PRDX1](/details-gene/5052)) may represent a protective mechanism that, when overwhelmed, could contribute to disease progression through iron-mediated oxidative damage. The prominent bioenergetic signature suggests that targeting the metabolic vulnerabilities of activated PaSCs could be a therapeutic strategy for disrupting pancreatic fibrosis. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The profound and specific enrichment of genes for the mitochondrial respiratory chain suggests that the high bioenergetic state of [pancreatic stellate cells](/details-cell/CL0002410) is not merely a housekeeping function but a core component of their identity that is required to fuel the energetically demanding processes of activation, including massive extracellular matrix protein synthesis and contraction, which drive pancreatic fibrosis. * **Surprising Findings:** It is striking that nearly a third of the top 20 marker genes are dedicated to mitochondrial respiration. This overrepresentation implies that metabolic state is as fundamental to this cell's identity as its better-known cytoskeletal and secretory properties. * **Testable Questions:** Does selective pharmacological inhibition of the electron transport chain (e.g., using metformin or rotenone) specifically suppress the activation of primary human PaSCs in vitro, as measured by alpha-SMA expression, collagen secretion, and migratory capacity? 2. **Hypothesis:** The constitutive high expression of the alarmin '[HMGB1](/details-gene/3146)' and robust antioxidant systems like '[PRDX1](/details-gene/5052)' indicates that [pancreatic stellate cells](/details-cell/CL0002410) are professional "sentinels" of the pancreatic microenvironment, primed to both sense and initiate inflammatory responses to tissue injury. We hypothesize that PaSCs act as a critical hub, integrating stress signals and releasing DAMPs like '[HMGB1](/details-gene/3146)' to orchestrate the early inflammatory and fibrotic cascade in pancreatitis. * **Surprising Findings:** While PaSCs are known responders to inflammation, the high intrinsic expression of a key inflammatory initiator like '[HMGB1](/details-gene/3146)' suggests they may play a more proactive role in triggering inflammation than previously appreciated. * **Testable Questions:** In an in vivo model of acute pancreatitis, does conditional knockout of '[HMGB1](/details-gene/3146)' specifically in [pancreatic stellate cells](/details-cell/CL0002410) reduce the initial influx of neutrophils and macrophages and ameliorate the severity of fibrosis?