Details for: CL0008035

Cell ID: CL0008035

Cell Name: microcirculation associated smooth muscle cell

Description: Any vascular associated smooth muscle cell that is part of some microcirculatory vessel.

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 microcirculation associated smooth muscle 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 microcirculation associated smooth muscle 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 microcirculation associated smooth muscle 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 microcirculation associated smooth muscle 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:  microcirculation associated smooth muscle cell (CL0008035)

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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 **microcirculation associated smooth muscle cell** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)) is a specialized vascular smooth muscle cell integral to the structure and function of microcirculatory vessels. Based on its gene significance profile, this cell is characterized by two predominant features: a highly developed contractile apparatus, exemplified by the top marker gene [MYL6](/details-gene/4637), and an exceptionally prominent bioenergetic machinery dedicated to aerobic respiration. The unique co-expression of genes for both sustained contraction and high-capacity ATP production underscores its critical role in the precise and continuous regulation of local blood flow and vascular resistance. ## Key Characteristics and Function The functional identity of the **microcirculation associated smooth muscle cell** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)) is defined by several distinct clusters of highly significant genes. * **Contractile and Cytoskeletal Machinery:** The most significant nuclear-encoded gene, [MYL6](/details-gene/4637) (Myosin Light Chain 6), is a fundamental component of the smooth muscle myosin motor complex. Its premier status (CSI: 35.05) highlights contractility as a core function, essential for modulating the diameter of arterioles and capillaries. The significance of [CALM1](/details-gene/801), encoding calmodulin, further supports this, as calmodulin is a primary calcium sensor that initiates the cascade leading to smooth muscle contraction. * **Bioenergetic Specialization:** A striking feature of this cell type is the profound and specific expression of numerous genes encoding components of the mitochondrial electron transport chain. Genes such as [ATP6](/details-gene/4508), [CYTB](/details-gene/4519), [ND4](/details-gene/4538), [COX2](/details-gene/4513), and others involved in oxidative phosphorylation exhibit extremely high Cell Significance Index (CSI) scores. **Overall**, this signature suggests that the cell's most distinguishing metabolic characteristic is its immense capacity for aerobic respiration. This is consistent with the high and sustained energy demand required to maintain vascular tone and respond to vasoactive signals. * **Metabolic Support and Homeostasis:** The high significance of ferritin light and heavy chain genes ([FTL](/details-gene/2512) and [FTH1](/details-gene/2495)) points to a robust system for iron storage and management. Iron is an essential cofactor for the cytochromes and iron-sulfur clusters of the mitochondrial respiratory complexes, indicating that iron homeostasis is tightly linked to the cell's bioenergetic capacity. Additionally, the high expression of housekeeping genes like [GAPDH](/details-gene/2597) suggests that glycolysis provides the necessary substrate for the dominant mitochondrial metabolism. * **Signaling and Immune Interaction:** The cell expresses significant levels of [B2M](/details-gene/567), a component of MHC class I molecules, suggesting a capacity for antigen presentation and interaction with the adaptive immune system, potentially surveying the local tissue microenvironment. Furthermore, the high significance of [HMGB1](/details-gene/3146), a known damage-associated molecular pattern (DAMP), suggests these cells may play a role in signaling tissue stress or injury to initiate inflammatory or repair processes. The unexpected high ranking of [ITM2B](/details-gene/9445), a gene linked to amyloid processing in familial dementias ([Link](https://doi.org/10.1038/21637)), hints at a potential role in vascular protein aggregation pathologies. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of the **microcirculation associated smooth muscle cell** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)) suggests its dysfunction could be central to a wide range of microvascular pathologies. Its profound reliance on oxidative phosphorylation makes it a potential target for diseases involving mitochondrial dysfunction, such as diabetic microangiopathy or ischemia-reperfusion injury. Impaired energy production in these cells could lead to a failure in maintaining appropriate vascular tone, contributing to tissue hypoperfusion or hypertension. The high significance of [ITM2B](/details-gene/9445) is particularly noteworthy. Mutations in this gene are causative for familial British dementia and familial Danish dementia, both characterized by cerebral amyloid angiopathy ([Link](https://doi.org/10.1038/21637); [Link](https://doi.org/10.1073/pnas.080076097)). Its specific expression in microcirculation smooth muscle cells may indicate that these cells are a key site for the production and deposition of pathogenic amyloid peptides, directly linking vascular smooth muscle cell biology to neurodegenerative disease. This suggests that vascular amyloidosis in these conditions may originate from, or be exacerbated by, dysfunction within this specific cell type. Similarly, the prominent expression of [HMGB1](/details-gene/3146) positions these cells as potential initiators of sterile inflammation in the microvasculature. Upon cellular stress or damage, the release of [HMGB1](/details-gene/3146) could recruit immune cells and propagate an inflammatory response, contributing to the pathogenesis of vasculitis or chronic inflammatory diseases. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The exceptional metabolic signature of **microcirculation associated smooth muscle cells** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)), defined by the highly specific expression of mitochondrial respiratory chain components, renders them uniquely susceptible to systemic metabolic insults (e.g., hyperglycemia, hypoxia) or mitochondrial toxins. This positions them as a primary locus of failure in the pathogenesis of microvascular diseases. * **Surprising Findings:** The expression specificity (CSI Z-score) of multiple mitochondrial-encoded genes ([ATP6](/details-gene/4508), [CYTB](/details-gene/4519)) is nearly identical to, or surpasses, that of many canonical nuclear-encoded structural proteins like [MYL6](/details-gene/4637). This suggests that the cell's metabolic identity is as defining and unique as its contractile function when compared across all cell types. * **Testable Questions:** In a mouse model of type 2 diabetes, do **microcirculation associated smooth muscle cells** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)) in tissues like the retina or kidney exhibit earlier signs of mitochondrial stress (e.g., increased reactive oxygen species, altered mitochondrial morphology) and functional impairment (e.g., reduced vasoreactivity) compared to smooth muscle cells from larger vessels like the aorta? 2. **Hypothesis:** Beyond regulating blood flow, **microcirculation associated smooth muscle cells** ([microcirculation associated smooth muscle cell](/details-cell/CL0008035)) function as critical hubs for processing and potentially accumulating pathogenic protein aggregates within the vessel wall. The specific high-level expression of [ITM2B](/details-gene/9445) indicates a specialized role in handling its protein product, which under certain genetic or environmental conditions, could lead to local amyloid deposition and initiate cerebral amyloid angiopathy. * **Surprising Findings:** The identification of a gene ([ITM2B](/details-gene/9445)) so strongly and specifically linked to rare neurodegenerative amyloidopathies as a top marker in a vascular smooth muscle cell is unexpected. It suggests a potential shared pathogenic mechanism between neurovascular and parenchymal amyloid diseases that is rooted in the biology of this specific cell type. * **Testable Questions:** Does the targeted knockout or overexpression of [ITM2B](/details-gene/9445) specifically in murine vascular smooth muscle cells alter the integrity of the blood-brain barrier or affect the perivascular clearance of other amyloidogenic proteins, such as amyloid-beta, in models of Alzheimer's disease?