Details for: CL0000235

Cell ID: CL0000235

Cell Name: macrophage

Description: Morphology: Diameter 30_M-80 _M, abundant cytoplasm, low N/C ratio, eccentric nucleus. Irregular shape with pseudopods, highly adhesive. Contain vacuoles and phagosomes, may contain azurophilic granules; markers: Mouse & Human: CD68, in most cases CD11b. Mouse: in most cases F4/80+; role or process: immune, antigen presentation, & tissue remodelling; lineage: hematopoietic, myeloid.

Synonyms: histiocyte

Selected Context(s): Overall

Gene Significance Landscape

Display Options
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 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 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 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 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:  macrophage (CL0000235)

 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.

Loading network (please wait)...

## Summary The [macrophage](/details-cell/CL0000235), also known as a [histiocyte](/details-cell/CL0000235), is a key myeloid hematopoietic cell essential for innate immunity, antigen presentation, and tissue remodeling. The gene significance profile, based on expression specificity (**Overall** context), highlights a cell defined not only by its classical immune functions but also by a highly active metabolic state, particularly in iron homeostasis and energy production. The top-ranking marker, [TPT1](/details-gene/7178), a translationally controlled tumor protein, suggests that a state of readiness for rapid protein synthesis is a uniquely defining characteristic of this cell type. ## Key Characteristics and Function Analysis of top marker genes, ranked by their specific expression using Z-scores, reveals several core functional clusters that define the [macrophage](/details-cell/CL0000235). * **Metabolic and Bioenergetic Hub:** A prominent feature is the high specificity of genes involved in core metabolic processes. This includes multiple components of the mitochondrial electron transport chain, such as [COX1](/details-gene/4512), [ND1](/details-gene/4535), [ND2](/details-gene/4536), and [ND4](/details-gene/4538), as well as ATP synthase subunit [ATP5F1E](/details-gene/514). This signature indicates a high state of aerobic respiration, likely necessary to fuel energy-intensive processes like phagocytosis, cytokine production, and cell motility. * **Iron Homeostasis and Sequestration:** The high significance of both ferritin light chain ([FTL](/details-gene/2512)) and heavy chain ([FTH1](/details-gene/2495)) underscores the central role of iron management in macrophage identity. This is consistent with their function in recycling iron from senescent erythrocytes and regulating its availability, which can also serve as a host defense mechanism by limiting iron for microbial growth. * **Innate and Adaptive Immune Interface:** As expected, genes related to immune function are significant markers. [B2M](/details-gene/567), a component of MHC class I molecules, [HLA-DPA1](/details-gene/3113), an MHC class II alpha chain, and [C1QB](/details-gene/713), a component of the classical complement pathway, highlight the macrophage's crucial role in antigen presentation to [T-cells](/details-cell/CL0000084) and initiating complement-mediated defense. * **Translational and Post-Transcriptional Regulation:** The top marker, [TPT1](/details-gene/7178), along with significant scores for polyamine metabolism genes ([SAT1](/details-gene/6303), [OAZ1](/details-gene/4946)) and RNA-binding proteins ([PABPC1](/details-gene/26986), [HNRNPA2B1](/details-gene/3181), [YBX1](/details-gene/4904)), suggests that post-transcriptional control is a defining feature. This may enable macrophages to rapidly alter their proteome in response to environmental cues without the delay of de novo transcription. * **Cytoskeletal Dynamics:** The specific expression of genes like cofilin 1 ([CFL1](/details-gene/1072)) and myosin light chain 6 ([MYL6](/details-gene/4637)) is consistent with the macrophage's described morphology, requiring dynamic cytoskeletal rearrangement for its characteristic phagocytic activity, adhesion, and motility. The anti-marker profile further refines the macrophage's identity by demonstrating a lack of expression of genes specific to other lineages. For instance, the low significance of astrocyte marker [GFAP](/details-gene/2670), erythroid markers ([ALAS2](/details-gene/212), [HBZ](/details-gene/3050)), and muscle-specific myosins ([MYH6](/details-gene/4624), [MYL7](/details-gene/58498)) confirms its distinct myeloid hematopoietic origin. ## Clinical Significance and Contextual Roles **Overall**, the gene profile points to a cell type deeply integrated into systemic health. The high expression of iron-managing proteins ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) implicates macrophages in diseases of iron overload or deficiency. The significance of [B2M](/details-gene/567) is clinically relevant, as its levels are often monitored in certain hematological malignancies. Furthermore, the presence of [ITM2B](/details-gene/9445), a gene associated with familial British and Danish dementias ([Link](https://doi.org/10.1038/21637)), suggests a potential link between macrophage-like microglia and neurodegenerative amyloid-related pathologies. While this dataset provides a general overview, the specific roles of macrophages are highly context-dependent, varying dramatically between healthy tissue surveillance, acute inflammation, chronic disease, and cancer. The presented profile likely represents an aggregate of these diverse states. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The status of [TPT1](/details-gene/7178) as the top specificity marker, along with other highly-ranked genes involved in polyamine metabolism ([SAT1](/details-gene/6303)) and RNA binding ([PABPC1](/details-gene/26986)), suggests that a macrophage's identity is defined less by a static cell surface signature and more by its capacity for rapid, post-transcriptional reprogramming in response to stimuli. * **Surprising Findings:** It is notable that a protein involved in translational control, [TPT1](/details-gene/7178), is more uniquely expressed in [macrophages](/details-cell/CL0000235) than classical immune markers like MHC components or complement factors in this analysis. This may indicate that the *potential* to rapidly synthesize new proteins is a more fundamental defining feature than the steady-state expression of any single immune receptor. * **Testable Questions:** Does knockdown of [TPT1](/details-gene/7178) or pharmacological inhibition of the polyamine pathway impair the ability of macrophages to polarize into M1 or M2 phenotypes upon stimulation with IFN-gamma/LPS or IL-4, respectively? 2. **Hypothesis:** The strong co-expression signature of ferritin subunits ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) and numerous mitochondrial components ([COX1](/details-gene/4512), [ND1](/details-gene/4535)) posits that iron handling is fundamentally linked to the bioenergetic state of the [macrophage](/details-cell/CL0000235), where iron sequestration serves a dual role in host defense and as a critical co-factor for its high metabolic activity. * **Surprising Findings:** The expression specificity of ferritin genes is higher than that of key antigen presentation ([HLA-DPA1](/details-gene/3113)) and complement ([C1QB](/details-gene/713)) genes. This elevates iron metabolism from a supportive function to a primary, identity-defining characteristic on par with its more recognized immunological roles. * **Testable Questions:** In response to pathogen exposure, is the upregulation of ferritin expression primarily driven by inflammatory signals to sequester iron from microbes, or by an increased metabolic demand for iron-sulfur clusters required for enhanced oxidative phosphorylation?