Details for: CL0000861

Cell ID: CL0000861

Cell Name: elicited macrophage

Description: Markers: CD11b+, CD68+; Mouse: F4/80+; role or process: immune, inflammation (inflammatory response).

Synonyms: free macrophage, wandering histiocyte

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 elicited macrophage 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 elicited macrophage. 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 elicited macrophage. 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 elicited macrophage. 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:  elicited macrophage (CL0000861)

 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 [elicited macrophage](/details-cell/CL0000861) is a terminally differentiated myeloid cell type central to the inflammatory response. Characterized by surface markers such as CD11b and CD68, these cells are recruited to sites of inflammation where they perform essential immune functions. Based on gene significance analysis, the molecular profile of the [elicited macrophage](/details-cell/CL0000861) is overwhelmingly dominated by genes involved in iron homeostasis, particularly the ferritin light and heavy chain subunits, [FTL](/details-gene/2512) and [FTH1](/details-gene/2495). This defining feature suggests a primary role in managing iron sequestration, a critical process for both controlling pathogen growth and mitigating local oxidative stress during an inflammatory event. ## Key Characteristics and Function **Overall**, the gene expression landscape of the [elicited macrophage](/details-cell/CL0000861) points to a cell that is highly metabolically active and primed for robust immune and homeostatic functions. The top marker genes can be organized into several key functional clusters: * **Iron Metabolism:** The most significant and defining markers for this cell type are [FTL](/details-gene/2512) (CSI: 132.70) and [FTH1](/details-gene/2495) (CSI: 122.58). These genes encode the subunits of ferritin, the primary intracellular iron storage protein. Their exceptional specificity suggests that a core function of elicited macrophages is to sequester free iron from the microenvironment. This action serves a dual purpose: depriving invading microbes of an essential nutrient and protecting host tissues from iron-catalyzed oxidative damage. * **High Metabolic Activity and Energy Production:** A large cohort of the top markers are components of the mitochondrial electron transport chain and ATP synthesis machinery. These include genes encoding subunits of cytochrome c oxidase ([COX1](/details-gene/4512), [COX2](/details-gene/4513), [COX4I1](/details-gene/1327)), NADH dehydrogenase ([ND1](/details-gene/4535), [ND2](/details-gene/4536)), cytochrome b ([CYTB](/details-gene/4519)), and ATP synthase ([ATP5F1E](/details-gene/514), [ATP5MG](/details-gene/10632)). The high significance of these genes indicates a reliance on oxidative phosphorylation to generate the substantial ATP required to fuel energy-intensive processes such as phagocytosis, motility, and the synthesis of inflammatory mediators. * **Polyamine Metabolism and Regulation:** The high ranking of [SAT1](/details-gene/6303), the rate-limiting enzyme in polyamine catabolism, and [OAZ1](/details-gene/4946), an inhibitor of polyamine synthesis, points to the tight and dynamic regulation of intracellular polyamines. Polyamines are crucial for cell growth, differentiation, and the regulation of inflammation, and this signature suggests their metabolism is a key axis of control in elicited macrophage function. * **Cytoskeletal Dynamics and Motility:** Genes such as [MYL6](/details-gene/4637) (myosin light chain 6) and [CFL1](/details-gene/1072) (cofilin 1) underscore the importance of the cytoskeleton. These proteins are essential for cell motility, phagocytosis, and the dramatic morphological changes macrophages undergo upon activation and migration into tissues. * **Antigen Presentation:** The high significance of [B2M](/details-gene/567), the light chain of MHC class I molecules, highlights the role of elicited macrophages in presenting endogenous antigens. This function is a critical bridge between the innate and adaptive immune systems, enabling the activation of cytotoxic T cells. * **General Cellular Machinery:** The presence of genes like [GAPDH](/details-gene/2597), [YBX1](/details-gene/4904), and [TPT1](/details-gene/7178) among the top markers, while often associated with 'housekeeping' functions, suggests that the entire transcriptional and translational machinery of the cell is operating at a high level to support its activated state. ## Clinical Significance and Contextual Roles The gene signature of the [elicited macrophage](/details-cell/CL0000861) has direct implications for various pathological states, particularly those involving chronic inflammation, infection, and cancer. The profound upregulation of iron-sequestering machinery ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) is clinically relevant to the anemia of chronic disease, a condition where systemic inflammation leads to iron retention within macrophages, limiting its availability for erythropoiesis. In the context of infection, this iron-hoarding phenotype is a key host defense mechanism. Conversely, within the tumor microenvironment, tumor-associated macrophages can exhibit altered iron handling that may either suppress or promote tumor growth, making these pathways a potential therapeutic target. The high metabolic rate, evidenced by the suite of mitochondrial genes, indicates that these cells are major consumers of energy and nutrients in inflamed tissues. Targeting macrophage metabolism is an emerging therapeutic strategy for inflammatory diseases and cancer. Furthermore, the prominence of polyamine-regulating genes like [SAT1](/details-gene/6303) is significant, as polyamine metabolism is a well-established target in oncology. The expression of [B2M](/details-gene/567) is clinically important as its serum levels are used as a prognostic marker in some hematological malignancies. The expression of calcium-binding proteins like [S100A6](/details-gene/6277) is also noteworthy, as members of the S100 family are frequently dysregulated in inflammatory conditions and cancers, acting as damage-associated molecular patterns (DAMPs) or regulators of cell proliferation. ## Potential Mechanisms and Research Directions 1. **Hypothesis: Elicited macrophages act as primary regulators of microenvironmental iron homeostasis, a role that defines their core inflammatory function.** The data strongly suggest that iron sequestration via ferritin is not merely one of many functions but a central, defining characteristic of this cell state, likely overriding other classical immune functions in terms of gene expression specificity. * **Surprising Findings:** The overwhelming dominance of [FTL](/details-gene/2512) and [FTH1](/details-gene/2495) in the Z-score analysis is striking. While macrophages are known iron handlers, this data suggests this function is their most unique and specific program compared to other cell types, potentially more so than cytokine or chemokine production in this **Overall** context. * **Testable Questions:** How does the specific deletion of [FTH1](/details-gene/2495) in myeloid cells impact the progression of bacterial vs. viral infections in vivo, and does this alter the local inflammatory cytokine milieu? 2. **Hypothesis: Elicited macrophages undergo a specific remodeling of the mitochondrial respiratory chain to balance high ATP demand with the regulation of reactive oxygen species (ROS) signaling.** The gene signature points to a highly active state of oxidative phosphorylation, but with a potentially unique stoichiometry of electron transport chain (ETC) components. * **Surprising Findings:** It is paradoxical that while numerous genes for mitochondrial ETC complexes are highly significant markers (e.g., [COX1](/details-gene/4512), [COX2](/details-gene/4513), [ND1](/details-gene/4535)), other genes encoding subunits of the same complexes (e.g., `COX3`, `ATP6`) appear as anti-markers with negative effect sizes. This cannot be explained by a simple increase in mitochondrial biogenesis and may indicate a selective, functional remodeling of the respiratory supercomplexes. * **Testable Questions:** Does the composition and supercomplex organization of the ETC in elicited macrophages differ from that of resident tissue macrophages, and how does this putative remodeling affect ATP/ROS output and subsequent inflammasome activation?