Details for: CL0002393

Cell ID: CL0002393

Cell Name: intermediate monocyte

Description: A monocyte that has characteristics of both patrolling and inflammatory monocytes.

Selected Context(s): Overall

Gene Significance Landscape

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Score:
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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 intermediate monocyte 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 intermediate monocyte. 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 intermediate monocyte. 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 intermediate monocyte. 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:  intermediate monocyte (CL0002393)

 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 [intermediate monocyte](/details-cell/CL0002393) is a myeloid lineage cell defined as having characteristics of both classical (inflammatory) and non-classical (patrolling) monocytes. The gene significance profile, based on expression specificity (**Overall** context), strongly suggests a primary and defining role in iron homeostasis. The exceptional z-score CSIs for ferritin light and heavy chain genes, [FTL](/details-gene/2512) (CSI: 79.23) and [FTH1](/details-gene/2495) (CSI: 67.17), indicate that iron storage is a uniquely prominent feature of this cell type. This is complemented by a signature of high metabolic activity, evidenced by the specific expression of numerous mitochondrial genes involved in aerobic respiration, suggesting these cells are metabolically primed for active immune functions. ## Key Characteristics and Function Analysis of top marker genes reveals several interconnected functional themes that characterize the [intermediate monocyte](/details-cell/CL0002393). * **Iron Sequestration and Metabolism:** The most specific markers for this cell type are [FTL](/details-gene/2512) and [FTH1](/details-gene/2495), which encode the light and heavy subunits of ferritin, the primary intracellular iron storage protein. Their high z-score CSIs suggest that a core function of intermediate monocytes is to sequester and manage iron, a process critical for both host defense (limiting iron availability to pathogens) and preventing iron-induced oxidative damage during inflammation. * **High Energy Metabolism:** A large cluster of top markers consists of genes encoding components of the mitochondrial electron transport chain, including [COX1](/details-gene/4512), [COX2](/details-gene/4513), [ND4](/details-gene/4538), [ND1](/details-gene/4535), and [ND2](/details-gene/4536), as well as ATP synthase subunit [ATP5F1E](/details-gene/514). This signature of high mitochondrial gene expression points to a reliance on oxidative phosphorylation and a state of high metabolic readiness, likely fueling energy-intensive processes such as phagocytosis, antigen presentation, and cytokine production. * **Polyamine Regulation:** The high specificity of [SAT1](/details-gene/6303) and [OAZ1](/details-gene/4946) indicates a uniquely regulated polyamine metabolism. [SAT1](/details-gene/6303) is the rate-limiting enzyme in polyamine catabolism, a pathway linked to cell proliferation, apoptosis, and inflammatory responses. This suggests that intermediate monocytes possess a distinct mechanism for controlling these fundamental cellular processes. * **Antigen Presentation and Immune Interaction:** The presence of [B2M](/details-gene/567) (Beta-2-microglobulin), an essential component of MHC class I molecules, and the non-classical MHC molecule [HLA E](/details-gene/3133) as specific markers is consistent with a role in immune surveillance. HLA-E typically presents a restricted set of peptides to NK cells and a subset of T cells, suggesting intermediate monocytes may be involved in modulating innate and adaptive immune responses through this specialized pathway. * **Negative Markers:** The lack of specificity for genes involved in common RNA processing and splicing, such as [HNRNPU](/details-gene/3192) and [SRSF5](/details-gene/6430), does not imply these processes are absent but rather that they are not distinguishing features of this cell type compared to others. This reinforces that the unique identity of the [intermediate monocyte](/details-cell/CL0002393) is more defined by its specialized metabolic and iron-handling machinery than by unique transcriptional regulation programs. ## Clinical Significance and Contextual Roles **Overall**, the gene profile of the [intermediate monocyte](/details-cell/CL0002393) implicates it as a key player in conditions involving inflammation, iron dysregulation, and high metabolic demand. The pronounced iron-handling signature ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) suggests a crucial role in the pathophysiology of diseases characterized by iron overload or sequestration, such as atherosclerosis, chronic kidney disease, and the "anemia of inflammation". In these conditions, intermediate monocytes may contribute to either protective iron sequestration within tissues like atherosclerotic plaques or pathological iron retention that limits erythropoiesis. Their high metabolic rate, driven by mitochondrial activity, could make them significant contributors to the production of reactive oxygen species (ROS) in inflammatory microenvironments, further influencing disease progression. The specific expression of [SAT1](/details-gene/6303) points to a potential role in cancer biology, where polyamine metabolism is often dysregulated to support rapid cell growth. Intermediate monocytes within the tumor microenvironment could influence tumor progression by modulating local polyamine levels. Furthermore, the role of [B2M](/details-gene/567) and [HLA E](/details-gene/3133) suggests these cells are active participants in immune surveillance, and their dysregulation could impact anti-tumor immunity or responses to infection. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Intermediate monocytes function as specialized iron-recycling depots within the circulatory system, crucial for managing iron bioavailability during inflammatory stress and red blood cell turnover. Their identity is more fundamentally defined by this metabolic role than by a transitional inflammatory state. * **Surprising Findings:** The overwhelming specificity of ferritin complex genes ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) surpasses that of any classical immune signaling molecules or surface markers. This suggests that the cell's role in iron biology may be its primary, rather than secondary, function. * **Testable Questions:** In an in vitro co-culture system, do [intermediate monocyte](/details-cell/CL0002393)s more efficiently phagocytose and process senescent red blood cells compared to classical or non-classical monocytes, and does this lead to a greater upregulation of [FTL](/details-gene/2512) and [FTH1](/details-gene/2495)? 2. **Hypothesis:** The highly specific expression of [SAT1](/details-gene/6303) acts as a metabolic checkpoint in intermediate monocytes, directing their high energetic potential towards distinct functional outcomes. Upregulation of [SAT1](/details-gene/6303) and subsequent polyamine catabolism may prime the cell for a pro-resolving or tissue-repair phenotype, while its inhibition favors a sustained pro-inflammatory response. * **Surprising Findings:** The identification of a key enzyme in polyamine metabolism, [SAT1](/details-gene/6303), as a top-ranking specific marker for a monocyte subset is unexpected. This highlights a potentially novel axis of metabolic regulation in myeloid cells that has not been extensively studied in this context. * **Testable Questions:** Does siRNA-mediated knockdown of [SAT1](/details-gene/6303) in human intermediate monocytes, followed by stimulation with IFN-gamma, alter the balance of secreted M1 (e.g., TNF-alpha) versus M2 (e.g., IL-10) cytokines?