GO:0072125 negative regulation of glomerular mesangial cell proliferation: Signaling Mechanisms, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0072125 describes any biological process that decreases the frequency, rate, or extent of glomerular mesangial cell proliferation.
• Mesangial cell proliferation is a hallmark of IgA nephropathy and diabetic nephropathy, making this GO term directly relevant to kidney disease research.
• Key negative regulators include TRIM40, microRNA-451, microRNA-382, ganglioside GM3, platelet factor 4, and endothelin signaling components.
• The process is often studied through ER stress, inflammasome inactivation, and microRNA-mediated repression of proliferative signaling.
• CRISPR knockout, point mutation, knock-in, and overexpression models are essential for causally linking candidate genes to mesangial cell proliferation control.
• Understanding this process can reveal therapeutic targets for chronic kidney disease and glomerulosclerosis.
Description
Glomerular mesangial cells are specialized pericytes that provide structural support to the glomerular capillary tuft and regulate filtration. Under pathological conditions, mesangial cells can proliferate excessively, leading to glomerulosclerosis and loss of kidney function. The Gene Ontology term GO:0072125, negative regulation of glomerular mesangial cell proliferation, captures the biological processes that restrain this proliferation. This term is critical for researchers studying kidney disease because mesangial cell hyperplasia is a common feature of IgA nephropathy and diabetic nephropathy. Understanding the molecular brakes on mesangial cell proliferation may identify new therapeutic strategies to prevent or slow chronic kidney disease progression. Several studies have identified specific negative regulators, including TRIM40, which inhibits IgA1-induced proliferation by inactivating the NLRP3 inflammasome, and microRNA-451, which suppresses proliferation through downregulation of PSMD11 and NF-kappaB p65. Other factors such as ganglioside GM3 and platelet factor 4 also negatively regulate mesangial cell proliferation. This article synthesizes the current knowledge on GO:0072125, covering its definition, mechanisms, key genes, disease relevance, and research methods.
negative regulation of glomerular mesangial cell proliferation At A Glance
| GO ID | GO:0072125 |
|---|---|
| GO term | negative regulation of glomerular mesangial cell proliferation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Decreases the frequency, rate or extent of glomerular mesangial cell proliferation |
| Related cell type | Glomerular mesangial cell |
| Associated diseases | IgA nephropathy, diabetic nephropathy, glomerulosclerosis |
| Key negative regulators | TRIM40, microRNA-451, microRNA-382, ganglioside GM3, platelet factor 4, endothelin signaling |
What Is GO:0072125?
GO:0072125 is defined as any process that decreases the frequency, rate or extent of glomerular mesangial cell proliferation. In other words, it encompasses all molecular and cellular events that put the brakes on the division of mesangial cells within the glomerulus. This includes signaling pathways, transcriptional repression, microRNA-mediated silencing, and protein degradation mechanisms that ultimately reduce the number of proliferating mesangial cells.
Why Is negative regulation of glomerular mesangial cell proliferation Important in Cell Biology?
GO:0072125 is important because uncontrolled mesangial cell proliferation is a central pathological mechanism in several kidney diseases, including IgA nephropathy and diabetic nephropathy. Identifying the negative regulators of this process can provide therapeutic targets to halt or reverse glomerular injury. Moreover, understanding how these brakes fail in disease can lead to biomarkers for early diagnosis and progression.
• Mesangial cell proliferation is a hallmark of IgA nephropathy and diabetic nephropathy.
• Negative regulation of proliferation prevents glomerulosclerosis and kidney failure.
• TRIM40 inhibits IgA1-induced mesangial cell proliferation via NLRP3 inflammasome inactivation.
• MicroRNA-451 suppresses inflammation and proliferation through PSMD11 and NF-kappaB p65.
• MicroRNA-382 repression reduces proliferation and extracellular matrix accumulation via FoxO1.
• Ganglioside GM3 negatively regulates proliferation in high glucose-treated mesangial cells.
• Platelet factor 4 inhibits mesangial cell proliferation.
• Endothelin signaling modulates protein kinases in mesangial cells.
• ER stress via EIF2alpha/ATF4 pathway enhances proliferation, highlighting the need for negative regulation.
• Lysophosphatidic acid increases proliferation via Rac1/MAPK/KLF5, showing the balance of positive and negative signals.
What Happens During negative regulation of glomerular mesangial cell proliferation?
Initiation of negative regulatory signals
In simple terms: The process starts when a signal tells the mesangial cell to stop dividing.
Negative regulation can be initiated by extracellular cues such as platelet factor 4, ganglioside GM3, or endothelin, which activate specific receptors and intracellular pathways. For example, platelet factor 4 directly inhibits mesangial cell proliferation in vitro and in vivo. Ganglioside GM3, a glycosphingolipid, negatively regulates proliferation in high glucose-treated mesangial cells. Endothelin signaling also modulates protein kinases that can influence proliferation.
Intracellular signaling cascades
In simple terms: Inside the cell, a chain of molecular events transmits the stop signal.
Upon receptor activation, intracellular kinases and phosphatases are engaged. Endothelin signaling regulates protein kinases in glomerular mesangial cells, which can lead to inhibition of proliferative pathways. The ER stress pathway involving EIF2alpha/ATF4 can enhance proliferation via cyclin D1, but negative regulators may counteract this by suppressing cyclin D1 or activating cell cycle inhibitors. MicroRNAs such as miR-451 and miR-382 act post-transcriptionally to downregulate proliferative genes.
Transcriptional and post-transcriptional repression
In simple terms: The cell reduces the production of proteins that drive division.
Negative regulation often involves reducing the expression of genes that promote proliferation. For instance, microRNA-451 downregulates PSMD11 and NF-kappaB p65, leading to decreased inflammation and proliferation. Repression of microRNA-382 inhibits mesangial cell proliferation and extracellular matrix accumulation via FoxO1 in diabetic nephropathy. TRIM40 inhibits IgA1-induced proliferation by ubiquitinating and inactivating the NLRP3 inflammasome.
Inhibition of cell cycle progression
In simple terms: The cell cycle is halted, preventing the cell from dividing.
Ultimately, negative regulation leads to cell cycle arrest. This can occur through downregulation of cyclins and cyclin-dependent kinases, or upregulation of cyclin-dependent kinase inhibitors. For example, the EIF2alpha/ATF4 pathway enhances proliferation via cyclin D1, so negative regulators may suppress cyclin D1. The exact mechanisms by which specific negative regulators halt the cell cycle in mesangial cells are still being elucidated, but likely involve modulation of cyclin D1, CDK4/6, and p27.
Resolution of proliferation and matrix accumulation
In simple terms: The stop signal reduces cell numbers and prevents scarring.
Effective negative regulation reduces mesangial cell number and extracellular matrix accumulation, preventing glomerulosclerosis. For example, TRIM40 inhibits proliferation and likely reduces matrix deposition. MicroRNA-382 repression reduces both proliferation and extracellular matrix accumulation. Thus, negative regulation of mesangial cell proliferation is tightly linked to the control of glomerular scarring.
Key Genes Involved in GO:0072125 negative regulation of glomerular mesangial cell proliferation
The following genes and proteins have been experimentally implicated in the negative regulation of glomerular mesangial cell proliferation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TRIM40 | Inhibits IgA1-induced proliferation by ubiquitinating NLRP3 inflammasome | Potential therapeutic target in IgA nephropathy |
| MIR451 | Downregulates PSMD11 and NF-kappaB p65 to inhibit inflammation and proliferation | MicroRNA-based therapy for mesangial proliferative diseases |
| MIR382 | Repression inhibits proliferation and ECM accumulation via FoxO1 | Target in diabetic nephropathy |
| FoxO1 | Transcription factor mediating anti-proliferative effects of miR-382 repression | Downstream effector in diabetic nephropathy |
| PSMD11 | Proteasome subunit downregulated by miR-451 | Inflammation and proliferation control |
| NF-kappaB p65 | Transcription factor downregulated by miR-451 | Inflammatory and proliferative signaling |
| NLRP3 | Inflammasome inactivated by TRIM40 | Innate immunity and proliferation |
| GM3 synthase (ST3GAL5) | Synthesizes ganglioside GM3, which negatively regulates proliferation | Metabolic control of mesangial cell growth |
| PF4 | Platelet factor 4 inhibits mesangial cell proliferation | Endogenous inhibitor |
| EDN1 | Endothelin-1 modulates protein kinases in mesangial cells | Vasoactive regulation of proliferation |
| EIF2AK3 (PERK) | ER stress kinase that can enhance proliferation via ATF4 | Context-dependent regulation |
| ATF4 | Transcription factor downstream of EIF2alpha that enhances proliferation via cyclin D1 | ER stress response |
| CCND1 | Cyclin D1, target of negative regulation to halt cell cycle | Cell cycle control |
| LPAR1 | Lysophosphatidic acid receptor that increases proliferation via Rac1/MAPK/KLF5 | Positive regulator, counteracted by negative regulators |
| RAC1 | Small GTPase mediating LPA-induced proliferation | Signaling node |
| KLF5 | Transcription factor downstream of LPA promoting proliferation | Potential target for inhibition |
| MAPK1/3 | ERK kinases in LPA signaling | Proliferative pathway |
How Is negative regulation of glomerular mesangial cell proliferation Regulated?
The negative regulation of glomerular mesangial cell proliferation is itself regulated by multiple mechanisms. Extracellular factors such as platelet factor 4 and ganglioside GM3 can activate inhibitory pathways. Intracellularly, microRNAs like miR-451 and miR-382 fine-tune the expression of proliferative genes. The ER stress response, via EIF2alpha/ATF4, can either promote or inhibit proliferation depending on context, indicating a complex regulatory network. Inflammasome inactivation by TRIM40 also serves as a regulatory node. Additionally, endothelin signaling modulates protein kinases that can influence proliferation. These regulatory layers ensure that mesangial cell proliferation is tightly controlled under normal conditions and becomes dysregulated in disease.
negative regulation of glomerular mesangial cell proliferation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TRIM40 | IgA nephropathy | Knockout mouse or cell line to assess proliferation and inflammasome activation |
| MIR382 | Diabetic nephropathy | Overexpression or knockout in mesangial cells under high glucose |
| MIR451 | Inflammatory kidney disease | Knockout or overexpression in mesangial cells |
| ST3GAL5 | Diabetic nephropathy | Knockout mice to study GM3 synthesis and proliferation |
| PF4 | Glomerulosclerosis | Exogenous administration in mesangial cell cultures or animal models |
IgA nephropathy
IgA nephropathy is characterized by mesangial cell proliferation and matrix expansion. TRIM40 inhibits IgA1-induced proliferation by inactivating the NLRP3 inflammasome, suggesting that loss of TRIM40 function may contribute to disease. The EIF2alpha/ATF4 pathway enhances proliferation via cyclin D1 during ER stress in IgA nephropathy, indicating that negative regulators that counteract this pathway could be therapeutic.
Diabetic nephropathy
In diabetic nephropathy, high glucose promotes mesangial cell proliferation and extracellular matrix accumulation. Repression of microRNA-382 inhibits proliferation and ECM accumulation via FoxO1 in mice with diabetic nephropathy. Ganglioside GM3 negatively regulates proliferation in high glucose-treated mesangial cells, suggesting a protective role. Lysophosphatidic acid increases proliferation via Rac1/MAPK/KLF5 in models of diabetic nephropathy, highlighting the balance between positive and negative signals.
Glomerulosclerosis
Excessive mesangial cell proliferation leads to glomerulosclerosis, a common endpoint of chronic kidney disease. Negative regulators such as platelet factor 4 inhibit mesangial cell proliferation and may prevent sclerosis. MicroRNA-451 inhibits inflammation and proliferation, potentially slowing sclerotic changes. Thus, enhancing negative regulatory pathways could be a strategy to combat glomerulosclerosis.
From negative regulation of glomerular mesangial cell proliferation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate mesangial cell proliferation? | CRISPR knockout of gene X in mesangial cell line, followed by proliferation assay |
| Does a specific point mutation in gene X affect its anti-proliferative function? | Point mutation knock-in via CRISPR in mesangial cells |
| Does overexpression of gene X inhibit proliferation? | CRISPR-mediated overexpression or lentiviral overexpression in mesangial cells |
| Does tagging gene X with a fluorescent marker affect its localization and function? | Knock-in of fluorescent tag using CRISPR |
| Which genes are essential for negative regulation? | Genome-wide CRISPR library screening in mesangial cells under proliferative conditions |
| What are the transcriptomic changes upon negative regulation? | RNA-seq after CRISPR activation or knockout of candidate regulators |
How to Study the negative regulation of glomerular mesangial cell proliferation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of gene function | Test if gene is required for negative regulation |
| CRISPR point mutation | Effect of specific amino acid change | Dissect functional domains |
| CRISPR knock-in | Tagged or reporter gene expression | Track localization or interactions |
| Overexpression | Gain of function | Test if gene is sufficient to inhibit proliferation |
| RNA-seq | Transcriptome changes | Identify downstream pathways |
| BrdU/EdU assay | DNA synthesis | Quantify proliferation |
| Western blot | Protein expression and phosphorylation | Validate signaling changes |
| Co-IP | Protein-protein interactions | Identify complexes |
CRISPR knockout and proliferation assays
CRISPR knockout of candidate negative regulators in glomerular mesangial cells followed by BrdU or EdU incorporation assays can determine whether the gene is required to restrain proliferation. For example, knocking out TRIM40 would test its role in IgA1-induced proliferation.
MicroRNA mimic and inhibitor studies
Transfection of microRNA mimics (e.g., miR-451, miR-382) or inhibitors can modulate negative regulation. Proliferation and target gene expression (e.g., PSMD11, FoxO1) can be measured.
RNA sequencing and bioinformatics
RNA-seq after CRISPR knockout or overexpression of candidate genes can reveal transcriptomic changes underlying negative regulation. Pathway analysis can identify downstream effectors such as NF-kappaB or FoxO1.
Protein interaction and ubiquitination assays
Co-immunoprecipitation and ubiquitination assays can elucidate mechanisms, such as TRIM40-mediated ubiquitination of NLRP3. Western blotting for cyclin D1 can assess cell cycle effects.
How CRISPR Can Be Used to Study GO:0072125 negative regulation of glomerular mesangial cell proliferation
Knockout
CRISPR knockout of candidate negative regulators (e.g., TRIM40, MIR451, MIR382) in mesangial cell lines or primary cells can determine whether loss of function increases proliferation. This is a direct way to test causality.
Point Mutation
Introducing specific point mutations (e.g., in the RING domain of TRIM40 or in the catalytic site of a kinase) can dissect which domains are required for negative regulation. This helps distinguish between scaffolding and enzymatic functions.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) or epitope tags (e.g., HA) into endogenous loci allows real-time tracking of protein localization and interaction without overexpression artifacts. This can be applied to genes like FoxO1 or NF-kappaB p65.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of negative regulators can test whether increased dosage inhibits mesangial cell proliferation. This is useful for validating therapeutic potential.
How EDITGENE Supports negative regulation of glomerular mesangial cell proliferation Research
Researchers studying negative regulation of glomerular mesangial cell proliferation-related genes often need to determine whether a candidate gene is causally involved in restraining mesangial cell division. EDITGENE provides a comprehensive suite of CRISPR services to enable such investigations, from knockout to precise point mutations and library screening.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of glomerular mesangial cell proliferation research.
Frequently Asked Questions About negative regulation of glomerular mesangial cell proliferation
What is GO:0072125?
GO:0072125 is a Gene Ontology term for any process that decreases the frequency, rate or extent of glomerular mesangial cell proliferation.
What genes are involved in negative regulation of glomerular mesangial cell proliferation?
Key genes include TRIM40, MIR451, MIR382, FoxO1, PSMD11, NF-kappaB p65, NLRP3, ST3GAL5, PF4, and EDN1.
How is negative regulation of mesangial cell proliferation studied?
Common methods include CRISPR knockout, microRNA mimics/inhibitors, RNA-seq, and proliferation assays like BrdU/EdU.
Why is negative regulation of mesangial cell proliferation important in kidney disease?
Loss of negative regulation leads to excessive mesangial cell proliferation, contributing to IgA nephropathy, diabetic nephropathy, and glomerulosclerosis.
What role does TRIM40 play in mesangial cell proliferation?
TRIM40 inhibits IgA1-induced proliferation by ubiquitinating and inactivating the NLRP3 inflammasome.
How does microRNA-451 affect mesangial cells?
MicroRNA-451 inhibits inflammation and proliferation by downregulating PSMD11 and NF-kappaB p65.
What is the role of ganglioside GM3 in mesangial cells?
Ganglioside GM3 negatively regulates proliferation in high glucose-treated glomerular mesangial cells.
Can platelet factor 4 inhibit mesangial cell proliferation?
Yes, platelet factor 4 has been shown to inhibit mesangial cell proliferation.
What signaling pathways are involved in negative regulation of mesangial cell proliferation?
Pathways include endothelin signaling, ER stress via EIF2alpha/ATF4, and microRNA-mediated repression.
What CRISPR models are available for studying this process?
EDITGENE offers knockout, point mutation, knock-in, overexpression, and library screening services for mesangial cell research.
Conclusion
GO:0072125, negative regulation of glomerular mesangial cell proliferation, is a critical biological process that restrains mesangial cell division and prevents glomerular disease. Key negative regulators such as TRIM40, microRNA-451, microRNA-382, ganglioside GM3, and platelet factor 4 have been identified through experimental studies. Understanding these mechanisms offers potential therapeutic avenues for IgA nephropathy, diabetic nephropathy, and glomerulosclerosis. CRISPR-based models are indispensable for dissecting the causal roles of these genes. EDITGENE provides comprehensive CRISPR services to support such research.
References
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- 2. Kim D et al.. 2019. Lysophosphatidic acid increases mesangial cell proliferation in models of diabetic nephropathy via Rac1/MAPK/KLF5 signaling.. Exp Mol Med 51(2):1-10 PMID: 30770784
- 3. Shen J et al.. 2021. TRIM40 inhibits IgA1-induced proliferation of glomerular mesangial cells by inactivating NLRP3 inflammasome through ubiquitination.. Mol Immunol 140:225-232 PMID: 34763147
- 4. Wang S et al.. 2018. Repression of microRNA-382 inhibits glomerular mesangial cell proliferation and extracellular matrix accumulation via FoxO1 in mice with diabetic nephropathy.. Cell Prolif 51(5):e12462 PMID: 29701296
- 5. Rho YI et al.. 2004. Mechanism for the negative regulation of cell proliferation by ganglioside GM3 in high glucose-treated glomerular mesangial cells.. Life Sci 75(1):51-62 PMID: 15102521
- 6. Wei H et al.. 2019. MicroRNA-451 inhibits inflammation and proliferation of glomerular mesangial cells through down-regulating PSMD11 and NF-κB p65.. Biosci Rep 39(10) PMID: 31652441
- 7. Barnes JL et al.. 1996. Inhibition of mesangial cell proliferation by platelet factor 4.. J Am Soc Nephrol 7(7):991-8 PMID: 8829113
- 8. Sorokin A et al.. 2002. Endothelin signalling and regulation of protein kinases in glomerular mesangial cells.. Clin Sci (Lond) 103 Suppl 48:132S-136S PMID: 12193071
