Details for: CL1000698

Cell ID: CL1000698

Cell Name: kidney resident macrophage

Description: A tissue-resident macrophage that is part of some kidney.

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 kidney resident 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 kidney resident 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 kidney resident 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 kidney resident 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:  kidney resident macrophage (CL1000698)

 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 [kidney resident macrophage](/details-cell/CL1000698) is a tissue-resident macrophage that is part of some kidney. **Overall**, its molecular identity is powerfully defined by genes essential for antigen presentation, suggesting a primary role as a professional antigen-presenting cell (APC) within the renal microenvironment. The high expression specificity of a complete suite of HLA class I ([B2M](/details-gene/567), [HLA B](/details-gene/3106)) and class II ([HLA DRA](/details-gene/3122), [HLA DRB1](/details-gene/3123), [CD74](/details-gene/972)) molecules underscores its specialization in immune surveillance and communication with the adaptive immune system. ## Key Characteristics and Function The gene significance profile of the [kidney resident macrophage](/details-cell/CL1000698) points towards a cell specialized in immune sensing, antigen processing, and homeostatic regulation. * **Antigen Presentation Machinery:** The most prominent feature of this cell is the highly specific expression of numerous genes involved in both MHC class I and class II antigen presentation pathways. High Z-scores for beta-2-microglobulin ([B2M](/details-gene/567)) and classical class I loci like [HLA B](/details-gene/3106) and [HLA C](/details-gene/3107) indicate a capacity to present endogenous antigens to [CD8-positive, alpha-beta T cells](/details-cell/CL0000625). Even more striking is the comprehensive signature of the MHC class II pathway, including the alpha ([HLA DRA](/details-gene/3122), [HLA DPA1](/details-gene/3113), [HLA DQA1](/details-gene/3117)) and beta ([HLA DRB1](/details-gene/3123), [HLA DPB1](/details-gene/3115)) chains, as well as the invariant chain [CD74](/details-gene/972), which is crucial for class II molecule assembly and loading. This complete molecular toolkit establishes its role as a key initiator of [CD4-positive, alpha-beta T cell](/details-cell/CL0000624) responses within the kidney. * **Innate Immune Function and Phagocytosis:** Beyond antigen presentation, this cell expresses specific markers of classical macrophage function. These include genes associated with immune cell activation ([AIF1](/details-gene/199)), signaling through activating receptors ([TYROBP](/details-gene/7305), [FCER1G](/details-gene/2207)), and interaction with the complement system ([C1QA](/details-gene/712), [C1QB](/details-gene/713)). The specific expression of [CYBA](/details-gene/1535), a component of the NADPH oxidase 2 complex, suggests a capacity for producing reactive oxygen species (ROS) as part of a phagocytic or inflammatory response. * **Metabolic and Homeostatic Roles:** The cell exhibits a strong signature for iron homeostasis, with high Z-scores for ferritin light chain ([FTL](/details-gene/2512)) and heavy chain ([FTH1](/details-gene/2495)). This points to a significant role in sequestering and managing iron within the kidney, a process critical for preventing iron-induced oxidative damage. Furthermore, the specific expression of the protease inhibitor [CST3](/details-gene/1471) (Cystatin C) and the antioxidant enzyme [GPX1](/details-gene/2876) suggests these macrophages contribute to tissue protection and the resolution of inflammation. * **Defining Negative Markers:** The anti-marker profile is characterized by the significant negative Z-scores for numerous mitochondrially-encoded genes involved in oxidative phosphorylation (e.g., [ND1](/details-gene/4535), [COX1](/details-gene/4512), [ATP6](/details-gene/4508)). This does not imply a lack of mitochondria, but rather that high-level expression of these genes is not a *specific* feature of this cell compared to metabolically active renal epithelial cells. The low specificity of ubiquitously expressed housekeeping genes like [GAPDH](/details-gene/2597) and [UBC](/details-gene/7316) further validates that the top markers represent a unique and defining transcriptional program for this cell type. ## Clinical Significance and Contextual Roles Although this analysis is based on an **Overall** context, the specific gene signature of the [kidney resident macrophage](/details-cell/CL1000698) has direct implications for kidney health and disease. The profound emphasis on HLA molecule expression suggests these cells are central players in renal immune responses. In the context of kidney transplantation, they are likely key instigators of allograft rejection by presenting donor-derived peptides to recipient T cells. In autoimmune diseases such as lupus nephritis, they may present self-antigens, perpetuating the inflammatory cascade. The cell's prominent iron-handling machinery ([FTL](/details-gene/2512), [FTH1](/details-gene/2495)) is highly relevant to acute kidney injury (AKI), where dysregulated iron metabolism is a known driver of tubular damage. These resident macrophages may play a dual role, either protecting the tissue by sequestering toxic free iron or contributing to injury through ferroptosis-related pathways. Notably, the high expression specificity of [CST3](/details-gene/1471) (Cystatin C), a widely used clinical biomarker for estimating glomerular filtration rate (eGFR), suggests that [kidney resident macrophages](/details-cell/CL1000698) could be a significant source of this protein. A mutation in the [CST3](/details-gene/1471) gene is associated with a hereditary form of amyloid angiopathy leading to stroke ([Link](https://pubmed.ncbi.nlm.nih.gov/2541223/)), highlighting the systemic importance of this macrophage-associated gene. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** Kidney resident macrophages are the primary sentinels and professional APCs of the renal parenchyma, responsible for initiating and shaping local adaptive T-cell responses during infection, autoimmunity, and transplant rejection. * **Surprising Findings:** The exceptional breadth of highly specific HLA molecules, including multiple class I and class II isotypes. This suggests a constitutive "readiness" to present a wide variety of antigens, rather than an induced state, distinguishing it as a uniquely specialized immune surveillance cell in the kidney. * **Testable Questions:** In a murine model of autoimmune glomerulonephritis, does the conditional depletion of resident macrophages specifically expressing MHC class II (e.g., using CX3CR1-CreERT2; I-A/I-E-fl/fl mice) prevent the intra-renal activation and proliferation of pathogenic CD4+ T cells? 2. **Hypothesis:** Through the coordinated expression of iron-sequestering proteins and ROS-generating enzymes, kidney resident macrophages act as critical regulators of oxidative homeostasis, with a role that can be either protective or pathogenic depending on the nature of the renal insult. * **Surprising Findings:** The concurrent high specificity of genes for both iron storage ([FTL](/details-gene/2512)) and oxidative burst ([CYBA](/details-gene/1535)). This implies that the cell is poised to execute two opposing functions related to iron and oxidative stress, suggesting the existence of a tightly regulated molecular switch that dictates its functional output. * **Testable Questions:** Using single-cell RNA sequencing and spatial transcriptomics on kidney tissue from an ischemia-reperfusion injury model, do [kidney resident macrophages](/details-cell/CL1000698) exhibit distinct transcriptional states correlating with either high-[FTL](/details-gene/2512) (pro-survival/sequestration) or high-[CYBA](/details-gene/1535) (pro-inflammatory/ROS production) expression, and how do these states correlate with the degree of adjacent tubular injury?