Details for: CL0000650

Cell ID: CL0000650

Cell Name: mesangial cell

Description: Do all of these cells really develop from some mesenchymal stem cell?

Synonyms: kidney mesangial cell

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 mesangial 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 mesangial 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 mesangial 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 mesangial 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:  mesangial cell (CL0000650)

 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 [mesangial cell](/details-cell/CL0000650) is a specialized cell type located within the renal glomerulus, positioned between the capillary loops. Based on its gene significance profile, this cell is characterized by a high degree of activity in fundamental cellular processes, particularly RNA processing, protein synthesis, and ion transport. The strong Z-score significance ([PABPC1](/details-gene/26986), [HNRNPH3](/details-gene/3189)) of genes involved in RNA metabolism suggests a critical role in tightly regulating the synthesis of proteins, likely including extracellular matrix components and contractile elements. Concurrently, the prominence of genes related to calcium signaling ([CACNA1C](/details-gene/775), [SLC8A1](/details-gene/6546)) and cytoskeletal function ([MYL6](/details-gene/4637)) underscores its well-established contractile function, which is pivotal for regulating glomerular filtration rate. ## Key Characteristics and Function **Overall**, the gene expression landscape of the [mesangial cell](/details-cell/CL0000650) reveals a multifaceted cell with key roles in structural maintenance, physiological regulation, and intercellular communication within the glomerulus. The top markers, identified by expression specificity (Z-score), can be grouped into several functional clusters. * **RNA and Protein Homeostasis:** A dominant feature of the [mesangial cell](/details-cell/CL0000650) is the high significance of genes involved in RNA binding, splicing, and protein turnover. Top markers include [PABPC1](/details-gene/26986) (poly(A)-binding protein), [HNRNPH3](/details-gene/3189) (heterogeneous nuclear ribonucleoprotein), [SERBP1](/details-gene/26135), and [MBNL1](/details-gene/4154). This, coupled with the significance of proteostasis components like [UBB](/details-gene/7314) (ubiquitin B) and [VCP](/details-gene/7415), suggests a high metabolic rate and continuous remodeling of its proteome and the surrounding extracellular matrix, a process central to both normal glomerular function and pathology. * **Contractility and Ion Transport:** The cell's identity is strongly linked to its contractile capabilities. This is supported by the significant expression of [MYL6](/details-gene/4637), a myosin light chain essential for muscle contraction. This function is tightly regulated by intracellular calcium, and accordingly, genes encoding key ion channels and transporters like [CACNA1C](/details-gene/775) (L-type voltage-gated calcium channel) and [SLC8A1](/details-gene/6546) (sodium/calcium exchanger) are defining markers. This machinery allows the cell to respond to vasoactive signals and modulate blood flow through the glomerular capillaries. * **Signaling and Immune Interaction:** [Mesangial cells](/details-cell/CL0000650) appear to be active participants in local signaling networks. The high significance of [B2M](/details-gene/567), a component of MHC class I molecules, is consistent with a role in antigen presentation and immune surveillance. Furthermore, the expression of the chemokine [CXCL12](/details-gene/6387) indicates a capacity to recruit and communicate with immune cells. Other significant markers like [CD63](/details-gene/967) (a tetraspanin involved in vesicle trafficking) and [FBLN5](/details-gene/10516) (an integrin-binding protein) highlight its interaction with other cells and the extracellular matrix. * **Cell Cycle and Chromatin Regulation:** The presence of markers such as [ENSA](/details-gene/2029), an inhibitor of protein phosphatase involved in the mitotic cell cycle, and [NASP](/details-gene/4678), a histone-binding protein, suggests a latent capacity for proliferation. This is clinically relevant, as mesangial cell proliferation is a hallmark of several forms of glomerulonephritis. The anti-marker profile helps refine the cell's identity. The low significance of genes like [COL5A2](/details-gene/1290) suggests that while mesangial cells manage the matrix, they may not be the primary source for all fibrillar collagen types found in the kidney. Similarly, the low ranking of ubiquitous housekeeping genes like [GAPDH](/details-gene/2597) and general transcription factors ([JUNB](/details-gene/3726)) is expected, as the Z-score metric specifically highlights genes with unique expression patterns rather than those expressed broadly at high levels. ## Clinical Significance and Contextual Roles The gene signature of the [mesangial cell](/details-cell/CL0000650) directly relates to its established roles in kidney health and disease. Its function as a structural and regulatory hub makes it a central player in pathologies affecting the glomerulus. * **Glomerulosclerosis and Diabetic Nephropathy:** The pronounced signature of RNA and protein synthesis machinery ([PABPC1](/details-gene/26986), [UBB](/details-gene/7314)) is highly relevant to diseases characterized by excessive extracellular matrix deposition, such as diabetic nephropathy. Dysregulation of these pathways likely contributes to the overproduction of matrix proteins, leading to scarring (sclerosis) and loss of filtration function. * **Glomerulonephritis:** The expression of immune-related genes like [B2M](/details-gene/567) and the chemokine [CXCL12](/details-gene/6387) supports the role of mesangial cells in initiating and perpetuating inflammatory responses within the glomerulus. They can act as non-professional antigen-presenting cells and, through chemokine secretion, recruit leukocytes, contributing to the inflammation seen in various forms of glomerulonephritis. * **Regulation of Blood Pressure and Filtration:** The contractile apparatus, marked by [MYL6](/details-gene/4637) and regulated by calcium channels like [CACNA1C](/details-gene/775), is fundamental to controlling the glomerular filtration surface area. Dysfunction in this system can contribute to altered renal hemodynamics, impacting systemic blood pressure and the kidney's ability to filter waste products effectively. The G-protein alpha subunit encoded by [GNAS](/details-gene/2778), also a significant marker, is a key transducer for many vasoactive hormones that act on mesangial cells. ## Potential Mechanisms and Research Directions 1. **Hypothesis:** The constellation of highly significant RNA-binding proteins ([PABPC1](/details-gene/26986), [HNRNPH3](/details-gene/3189), [SERBP1](/details-gene/26135)) constitutes a post-transcriptional "regulon" that governs the expression of matrix and pro-inflammatory proteins. In disease states like diabetic nephropathy, this regulon may be hijacked by hyperglycemia-induced signals, leading to the stabilization and enhanced translation of mRNAs encoding fibrotic and inflammatory factors. * **Surprising Findings:** It is notable that the most specific markers for this cell are not the final effector proteins (e.g., collagens) but rather the upstream machinery controlling protein expression. This suggests that the cell's identity is defined more by its regulatory potential than its static structural components, pointing towards RNA metabolism as a key therapeutic target. * **Testable Questions:** In a human mesangial cell culture model, does high glucose treatment alter the binding affinity of [PABPC1](/details-gene/26986) to the poly(A) tails of mRNAs for fibronectin or TGF-beta? Can immunoprecipitation of [PABPC1](/details-gene/26986) followed by RNA-sequencing (RIP-Seq) identify a specific set of target mRNAs that are dysregulated under disease-mimicking conditions? 2. **Hypothesis:** The L-type calcium channel [CACNA1C](/details-gene/775) acts as a critical integration point for diverse signals (e.g., mechanical stretch, hormones, inflammatory chemokines like [CXCL12](/details-gene/6387)) to modulate mesangial cell contractility. This channel's activity may not only regulate glomerular blood flow but also trigger downstream calcium-dependent signaling cascades that influence gene expression related to proliferation and fibrosis. * **Surprising Findings:** The high specificity of [CACNA1C](/details-gene/775), a channel traditionally studied in detail in cardiomyocytes and neurons, for [mesangial cells](/details-cell/CL0000650) within the kidney context is unexpected. It implies that pharmacological agents targeting this channel, developed for cardiovascular conditions, may have unappreciated and direct effects on renal hemodynamics and pathology. * **Testable Questions:** Using live-cell calcium imaging, does the application of [CXCL12](/details-gene/6387) to cultured mesangial cells induce intracellular calcium transients, and can these transients be blocked by specific L-type calcium channel antagonists like nifedipine? Furthermore, does chronic stimulation of [CACNA1C](/details-gene/775) channels lead to the activation of pro-fibrotic transcription factors such as NFAT (Nuclear Factor of Activated T-cells)?