Details for: CL0000453

Cell ID: CL0000453

Cell Name: Langerhans cell

Description: Originally described in the dendritic cell ontology (DC_CL:0000021 )(PMID:19243617). These cells are also CD1a-high, CD14-negative, CD207-positive (langerin), CD324-positive (E-cadherin), and DCIR-positive. They reside in the epidermis.

Synonyms: LC

Selected Context(s): Overall

Gene Significance Landscape

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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 Langerhans 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 Langerhans 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 Langerhans 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 Langerhans 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:  Langerhans cell (CL0000453)

 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.

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## Summary The [Langerhans cell](/details-cell/CL0000453) is a specialized immune cell residing in the epidermis, characterized by the expression of CD207 (langerin) and CD1a. The provided gene significance data, based on expression specificity (**Overall** context `csi_z` score), paints a picture of a cell with an exceptionally high basal metabolic rate and protein synthesis capacity. The most defining genes are not immune-specific signaling molecules but rather core components of mitochondrial respiration ([COX2](/details-gene/4513), [COX1](/details-gene/4512)) and iron homeostasis ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)), suggesting that a state of heightened metabolic readiness is a fundamental aspect of its identity as an epidermal sentinel. This is complemented by the high specificity of genes involved in antigen presentation, such as [B2M](/details-gene/567) and [HLA DPA1](/details-gene/3113), confirming its primary function as a professional antigen-presenting cell (APC). ## Key Characteristics and Function Analysis of the top marker genes, ranked by expression specificity, reveals several core functional clusters that define the [Langerhans cell](/details-cell/CL0000453). * **High Energy Metabolism:** A striking number of top markers are components of the mitochondrial electron transport chain, including [COX2](/details-gene/4513), [COX1](/details-gene/4512), [CYTB](/details-gene/4519), and [ATP6](/details-gene/4508), as well as ATP synthase subunit [ATP5F1E](/details-gene/514). The high specificity scores for these genes suggest that [Langerhans cells](/details-cell/CL0000453) possess a uniquely high capacity for oxidative phosphorylation compared to other cell types in this dataset. This high energy state is likely required to fuel their constant immune surveillance, motility within the epidermis, and rapid activation upon encountering pathogens. * **Iron Homeostasis and Protein Synthesis:** The two most specific markers are [FTH1](/details-gene/2495) and [FTL](/details-gene/2512), the heavy and light chains of ferritin, respectively. This points to a critical role for iron sequestration and management. This may serve to limit iron availability to invading microbes or to mitigate oxidative stress. This metabolic theme is further supported by the high specificity of genes involved in protein synthesis and RNA processing, such as [PABPC1](/details-gene/26986), [EEF1B2](/details-gene/1933), and [NPM1](/details-gene/4869), consistent with the high turnover of proteins required for antigen processing and presentation. * **Antigen Presentation and Immune Function:** The cell's canonical role as an APC is confirmed by the high specificity scores for [B2M](/details-gene/567), a component of the MHC class I complex, and [HLA DPA1](/details-gene/3113), an MHC class II alpha chain. The high rank of [B2M](/details-gene/567) in particular underscores the importance of the MHC class I pathway in these cells. * **Cytoskeletal Dynamics:** Genes involved in cytoskeletal organization, such as [CFL1](/details-gene/1072) (cofilin 1) and myosin light chains ([MYL12A](/details-gene/10627), [MYL6](/details-gene/4637)), are also among the top specific markers. This is consistent with the cell's requirement for motility to survey its epidermal environment and migrate to draining lymph nodes to initiate adaptive immune responses. The **Anti_Markers** profile helps to refine the cell's identity. The low significance of genes associated with other hematopoietic lineages, such as the granulocyte colony-stimulating factor receptor [CSF3R](/details-gene/1441) and the scavenger receptor [SCARF1](/details-gene/8578), confirms its distinction from myeloid phagocytes like neutrophils and some macrophage subsets. ## Clinical Significance and Contextual Roles While this analysis is based on a single **Overall** context, the unique gene signature of [Langerhans cells](/details-cell/CL0000453) has significant clinical implications. Their high metabolic state suggests they may be particularly vulnerable to metabolic poisons or nutrient deprivation, which could impair skin immunity. The prominent role of ferritin ([FTH1](/details-gene/2495), [FTL](/details-gene/2512)) suggests a potential link between skin iron disorders and immune function. As potent APCs, [Langerhans cells](/details-cell/CL0000453) are central to skin pathologies, including allergic contact dermatitis, psoriasis, and skin cancer immunosurveillance. The high expression of [B2M](/details-gene/567) is clinically relevant, as mutations or loss of [B2M](/details-gene/567) is a mechanism by which tumor cells evade T-cell mediated cytotoxicity. Therefore, the functional integrity of the antigen presentation machinery in [Langerhans cells](/details-cell/CL0000453) is likely critical for controlling cutaneous malignancies. The data suggest that the metabolic fitness of these cells, driven by mitochondrial and iron-related genes, is an inseparable component of their immune-surveillance capabilities. ## Potential Mechanisms and Research Directions 1. **Hypothesis: [Langerhans cells](/details-cell/CL0000453) are maintained in a state of "metabolic priming" essential for rapid immune activation.** The unique co-expression of highly specific markers for both mitochondrial respiration ([COX1](/details-gene/4512), [COX2](/details-gene/4513)) and protein synthesis machinery ([PABPC1](/details-gene/26986)) suggests these cells exist in a state of heightened readiness. This metabolic poise may allow them to quickly ramp up antigen processing and cytokine production, and to fuel their energy-intensive migration to lymph nodes upon encountering a pathogen, without first needing to undergo extensive metabolic reprogramming. * **Surprising Findings:** The most specific genetic markers for this sentinel immune cell are not classical immune receptors or cytokines, but rather ubiquitous genes involved in core metabolism. This finding suggests that for [Langerhans cells](/details-cell/CL0000453), their functional state is so metabolically demanding that these "housekeeping" pathways become their most distinguishing feature relative to other cells. * **Testable Questions:** Does selective inhibition of mitochondrial complex IV (cytochrome c oxidase) in skin explants delay the migration of [Langerhans cells](/details-cell/CL0000453) from the epidermis and reduce their ability to upregulate co-stimulatory molecules (e.g., CD80/CD86) in response to a defined inflammatory stimulus such as lipopolysaccharide? 2. **Hypothesis: Ferritin-mediated iron sequestration is a specialized protective and immunomodulatory function of epidermal [Langerhans cells](/details-cell/CL0000453).** The extraordinary specificity of ferritin heavy ([FTH1](/details-gene/2495)) and light chains ([FTL](/details-gene/2512)) suggests a role beyond simple iron storage. This intense iron-sequestering activity may serve a dual purpose: 1) creating an iron-poor microenvironment to inhibit the growth of invading bacteria and fungi (nutritional immunity), and 2) protecting the cell and surrounding keratinocytes from iron-catalyzed reactive oxygen species (ROS) generated by UV radiation exposure in the epidermis. * **Surprising Findings:** Genes for iron metabolism show greater expression specificity than key components of the MHC class II antigen presentation pathway, such as [HLA DPA1](/details-gene/3113). This implies that while antigen presentation is a defining function, the unique magnitude of iron handling is an even more distinctive characteristic of [Langerhans cells](/details-cell/CL0000453) in their native tissue environment. * **Testable Questions:** Using high-resolution spatial transcriptomics or in situ hybridization on skin biopsies, is the expression of [FTH1](/details-gene/2495) and [FTL](/details-gene/2512) in [Langerhans cells](/details-cell/CL0000453) significantly higher than in other dermal immune cells? Furthermore, does siRNA-mediated knockdown of [FTH1](/details-gene/2495) in a [Langerhans cell](/details-cell/CL0000453)-like cell line increase their susceptibility to oxidative stress-induced apoptosis?