Details for: CL0002145

Cell ID: CL0002145

Cell Name: ciliated columnar cell of tracheobronchial tree

Description: A multi-ciliated epithelial cell located in the trachea and bronchi, characterized by a columnar shape and motile cilia on its apical surface. These cilia facilitate mucociliary clearance by moving mucus and trapped particles toward the pharynx.

Synonyms: ciliated columnar cell of tracheobronchial tree

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 ciliated columnar cell of tracheobronchial tree 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 ciliated columnar cell of tracheobronchial tree. 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 ciliated columnar cell of tracheobronchial tree. 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 ciliated columnar cell of tracheobronchial tree. 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.

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Target Cell for CSI:  ciliated columnar cell of tracheobronchial tree (CL0002145)

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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
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 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 [ciliated columnar cell of the tracheobronchial tree](/details-cell/CL0002145) is a highly specialized epithelial cell central to the mucociliary clearance mechanism of the respiratory system. Gene significance analysis reveals a profile dominated by two core functions: immense metabolic activity and robust cytoprotective capabilities. The striking co-expression of a vast suite of mitochondrial genes, essential for energy production, alongside potent antioxidant and detoxification enzymes such as [GSTP1](/details-gene/2950), suggests this cell is not merely a mechanical sweeper but a high-energy metabolic hub that serves as a critical first line of defense against oxidative stress from inhaled environmental agents. ## Key Characteristics and Function The transcriptional identity of the [ciliated columnar cell of the tracheobronchial tree](/details-cell/CL0002145) is defined by several key functional clusters that underscore its physiological roles. * **High-Energy Metabolic Engine:** A remarkably large number of top-ranking markers are components of the mitochondrial electron transport chain. This includes multiple NADH dehydrogenase subunits ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND3](/details-gene/4537), [ND4](/details-gene/4538)), cytochrome c oxidase subunits ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX3](/details-gene/4514)), cytochrome b ([CYTB](/details-gene/4519)), and ATP synthase ([ATP6](/details-gene/4508)). The high specificity scores (**Overall** `csi_z` > 37 for all) for these genes strongly indicate that this cell type possesses an exceptionally high and specialized capacity for aerobic respiration. This is consistent with the immense ATP demand required to power the continuous, coordinated beating of motile cilia for mucociliary transport. * **Antioxidant and Detoxification Shield:** The most specific marker for this cell is [GSTP1](/details-gene/2950), a key enzyme in the conjugation and detoxification of a wide range of xenobiotics and products of oxidative stress. This is complemented by the high significance of other cytoprotective genes, including superoxide dismutase ([SOD1](/details-gene/6647)), peroxiredoxin 1 ([PRDX1](/details-gene/5052)), and ferritin heavy chain ([FTH1](/details-gene/2495)), which manages iron to prevent the generation of free radicals. This signature highlights the cell's crucial role as a barrier, actively neutralizing harmful inhaled pollutants, allergens, and pathogens. * **Calcium-Dependent Regulation:** The high significance scores for calmodulin genes ([CALM1](/details-gene/801) and [CALM2](/details-gene/805)) and another calcium-binding protein ([S100A6](/details-gene/6277)) point to the central role of calcium signaling in regulating this cell's function. Intracellular calcium concentration is a known critical regulator of ciliary beat frequency and pattern. The prominence of these genes suggests a sophisticated machinery for sensing and responding to signals that modulate mucociliary clearance rates. * **Anti-Markers:** The provided anti-markers, such as the salivary enzyme [AMY1A](/details-gene/276) and genes associated with ciliary assembly like [CFAP206](/details-gene/154313) and [DNAH3](/details-gene/55567), have low statistical significance (p-value > 0.6). While caution is warranted, the lack of a strong signal for some core ciliary structural genes may suggest that while these components are essential, their expression is not as uniquely high in this cell type compared to other ciliated cells in the body. The cell's defining signature appears to be less about the basic ciliary structure and more about the specialized systems that fuel and protect it. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of the [ciliated columnar cell of the tracheobronchial tree](/details-cell/CL0002145) implicates it as a key player in the pathogenesis of respiratory diseases linked to environmental exposures and oxidative stress. The extremely high specificity of detoxification enzymes, particularly [GSTP1](/details-gene/2950), suggests that the functional integrity of this cell type is paramount in protecting the lungs from airborne toxins and carcinogens, such as those found in cigarette smoke and air pollution. Alterations in the expression or function of [GSTP1](/details-gene/2950) within these cells could modulate individual susceptibility to lung cancer and chronic obstructive pulmonary disease (COPD). Furthermore, the cell's profound reliance on mitochondrial energy production makes it potentially vulnerable to mitochondrial dysfunction. Given that many inhaled toxicants can impair mitochondrial function, damage to this cellular powerhouse could lead to reduced ciliary beat frequency, impaired mucociliary clearance, and subsequent mucus accumulation and chronic infection, hallmarks of diseases like cystic fibrosis and chronic bronchitis. The high expression of [SOD1](/details-gene/6647), a gene whose mutations are linked to familial amyotrophic lateral sclerosis, underscores the cell's critical need to manage superoxide radicals, a natural byproduct of its intense oxidative phosphorylation. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The dominant cytoprotective gene signature, led by [GSTP1](/details-gene/2950), is a specialized adaptation of tracheobronchial ciliated cells to function as a "detoxification barrier." This role is as critical as its mechanical function, actively neutralizing inhaled xenobiotics to protect the underlying lung parenchyma from injury and inflammation. * **Surprising Findings:** The premier marker for a cell defined by its motile cilia is not a structural or motor protein, but an enzyme for glutathione conjugation. This finding re-contextualizes the ciliated cell from a simple mechanical brush to a sophisticated biochemical shield, suggesting its detoxification capacity is a highly specific and defining feature. * **Testable Questions:** In an air-liquid interface culture model of primary human tracheobronchial epithelial cells, does siRNA-mediated knockdown of [GSTP1](/details-gene/2950) in ciliated cells increase the levels of DNA adducts and inflammatory cytokine secretion ([IL-8](/details-gene/3576), [IL-6](/details-gene/3569)) following exposure to a standardized dose of cigarette smoke extract? 2. **Hypothesis:** The specific, high-level expression of mitochondrial respiratory chain genes is tightly co-regulated with calcium signaling pathways ([CALM1](/details-gene/801), [CALM2](/details-gene/805)) to create a dedicated, high-capacity ATP generation system. This system is not for general housekeeping but is specifically architected to provide rapid, on-demand energy to fuel the calcium-dependent modulation of ciliary beating required for an effective physiological response to stimuli. * **Surprising Findings:** While metabolically essential, the sheer number and high specificity ranks of mitochondrial genes ([ND1](/details-gene/4535), [COX1](/details-gene/4512), etc.) are overwhelming, suggesting energy production is a more distinguishing feature of this cell than the ciliary apparatus itself. This implies that the regulation of ciliary fuel supply may be a key point of functional specialization among different ciliated cell types. * **Testable Questions:** Using live-cell imaging and Seahorse metabolic analysis, does stimulation of ciliated cells with a calcium ionophore like A23187 lead to a concurrent, calmodulin-dependent spike in both ciliary beat frequency and the mitochondrial oxygen consumption rate?