Details for: CL1000850

Cell ID: CL1000850

Cell Name: macula densa epithelial cell

Description: An epithelial cell that is part of the macula densa, characterized by a tightly packed arrangement, apically positioned nuclei, and prominent primary cilia, creating a distinctive 'dense spot' appearance under microscopy. It is involved in regulating renal blood flow, glomerular filtration rate, and renin release.

Synonyms: macula densa cell

Selected Context(s): Overall

Gene Significance Landscape

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Genes

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Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Image representation

Depiction of macula densa epithelial cell
Courtesy of SwissBioPics

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for macula densa epithelial 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 macula densa epithelial 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 macula densa epithelial 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 macula densa epithelial 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:  macula densa epithelial cell (CL1000850)

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Nodes (Genes):
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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 [macula densa epithelial cell](/details-cell/CL1000850) is a specialized cell type within the kidney's juxtaglomerular apparatus, critical for regulating renal blood flow and glomerular filtration rate. Based on its gene significance profile, this cell is characterized by an exceptionally high metabolic rate and an intense focus on ion transport. The prominent expression specificity of Na+/K+ ATPase subunits, such as [ATP1A1](/details-gene/476), and the kidney-specific glycoprotein [UMOD](/details-gene/7369), underscores its primary function as a highly active chemosensor, monitoring the sodium chloride concentration of the tubular fluid. ## Key Characteristics and Function Analysis of the top marker genes for the [macula densa epithelial cell](/details-cell/CL1000850) in the **Overall** context reveals several core functional clusters that define its specialized physiological role. * **Intense Ion Transport:** The most defining characteristic is the cell's machinery for ion transport. [ATP1A1](/details-gene/476) and [ATP1B1](/details-gene/481), the alpha-1 and beta-1 subunits of the Na+/K+-ATPase pump, are among the top markers. This is consistent with the cell's known function in sensing luminal NaCl concentration, a process dependent on basolateral ion pumping to maintain the electrochemical gradients necessary for apical ion entry. * **High Metabolic Activity:** The cell exhibits a strong signature of high energy demand, likely to fuel its ion transport activities. A large number of genes involved in oxidative phosphorylation show significant expression specificity, including multiple subunits of the NADH dehydrogenase complex ([ND1](/details-gene/4535), [ND2](/details-gene/4536), [ND4](/details-gene/4538)), ATP synthase ([ATP6](/details-gene/4508), [ATP5F1B](/details-gene/506)), and cytochrome c oxidase ([COX1](/details-gene/4512), [COX7C](/details-gene/1350)). The high specificity of [LDHB](/details-gene/3945) also suggests a significant role for lactate metabolism, perhaps to buffer against fluctuations in energy demand. * **Renal-Specific Identity and Immunomodulation:** The high CSI for [UMOD](/details-gene/7369) (Tamm-Horsfall glycoprotein) firmly establishes the cell's renal identity. Beyond its role as a secreted protein, publications suggest it may function as a "renal ligand for lymphokines" ([Link](https://doi.org/10.1126/science.3498215)), indicating a potential immunomodulatory role. This is complemented by the expression of [B2M](/details-gene/567) (Beta-2-microglobulin), a component of MHC class I molecules, and [CD59](/details-gene/966), an inhibitor of the complement membrane attack complex, suggesting a capacity for immune interaction and self-protection. * **Signaling and Structural Integrity:** The profile includes genes involved in cell signaling and structure, such as [PEBP1](/details-gene/5037), an inhibitor of the Raf/MAPK pathway, and [PSAP](/details-gene/5660), which is involved in sphingolipid metabolism. The presence of [APP](/details-gene/351) may indicate roles in cell adhesion or signaling beyond its well-known context in Alzheimer's disease. The anti-marker profile lacks strong negative markers for other specific lineages, reinforcing that the [macula densa epithelial cell](/details-cell/CL1000850) is a highly specialized cell whose transcriptional program is dominated by its primary functions rather than the active suppression of alternate fates. ## Clinical Significance and Contextual Roles As only an **Overall** context is provided, a dynamic analysis is not possible. However, the top marker genes have significant clinical implications. Mutations in [UMOD](/details-gene/7369) are directly causative for autosomal dominant tubulointerstitial kidney diseases, including medullary cystic kidney disease 2 and familial juvenile hyperuricemic nephropathy, as established in a key study ([Link](https://doi.org/10.1136/jmg.39.12.882)). The high specificity of [UMOD](/details-gene/7369) in [macula densa cells](/details-cell/CL1000850) suggests this cell type could be a critical site for the initiation or progression of these pathologies. The prominent expression of [ATP1A1](/details-gene/476) is also clinically relevant, as this pump is the target for cardiac glycosides like digoxin. While therapeutic effects are focused on the heart, this data suggests that such drugs could have direct, and potentially underappreciated, effects on renal autoregulation via the macula densa. Furthermore, the cell's profound reliance on mitochondrial function, highlighted by the suite of top mitochondrial gene markers, suggests a heightened vulnerability to mitochondrial toxins or systemic metabolic diseases like diabetes, which can impair mitochondrial function and contribute to diabetic nephropathy. The expression of [APP](/details-gene/351), the amyloid precursor protein, is notable, though its specific role in renal physiology versus its well-documented role in neurodegeneration remains to be elucidated. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The strong co-expression of genes for oxidative phosphorylation (e.g., [COX1](/details-gene/4512), [ND1](/details-gene/4535)) and anaerobic glycolysis ([LDHB](/details-gene/3945)) suggests that the [macula densa epithelial cell](/details-cell/CL1000850) utilizes a flexible, hybrid metabolic system to meet the intense and fluctuating ATP demands of NaCl sensing and signaling. This metabolic plasticity may be crucial for maintaining renal autoregulation across a range of physiological states. * **Surprising Findings:** The high CSI for [LDHB](/details-gene/3945) is unexpected in a cell presumed to operate under aerobic conditions with high mitochondrial density. This may indicate that lactate production is not just a byproduct but an integral part of its bioenergetic or signaling functions, perhaps allowing for more rapid ATP production than oxidative phosphorylation alone can provide during acute changes in tubular flow. * **Testable Questions:** How does acute inhibition of lactate dehydrogenase via a specific inhibitor (e.g., oxamate) affect the macula densa's signaling response (e.g., ATP release, calcium signaling) to a rapid increase in luminal NaCl concentration? 2. **Hypothesis:** The [macula densa epithelial cell](/details-cell/CL1000850) functions as a local immune sentinel, using the secretion of [UMOD](/details-gene/7369) in concert with surface molecules like [B2M](/details-gene/567) and [CD59](/details-gene/966) to communicate tubular health status to adjacent immune cells and protect itself from complement-mediated damage. This suggests a more integrated role for the cell in coordinating renal function with local immune surveillance. * **Surprising Findings:** The combination of a highly specific secreted immunomodulator ([UMOD](/details-gene/7369)), a core component of antigen presentation ([B2M](/details-gene/567)), and a complement inhibitor ([CD59](/details-gene/966)) within a single, non-professional immune cell's top markers suggests a sophisticated, localized immune-regulatory hub. This role is not traditionally emphasized in descriptions of macula densa function, which focus on hemodynamics. * **Testable Questions:** Using in-situ imaging or single-cell spatial transcriptomics, do [macula densa epithelial cells](/details-cell/CL1000850) show direct physical proximity or ligand-receptor pairing with specific subsets of renal-resident lymphocytes or myeloid cells, and does this interaction change during acute kidney injury?