GO:0120076 negative regulation of endocardial cushion cell differentiation: Regulatory Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0120076 describes any process that stops, prevents, or reduces the frequency, rate or extent of endocardial cushion cell differentiation, a critical step in heart valve and septal development.
• Endocardial cushion cell differentiation is driven by TGF-beta-dependent epithelial-to-mesenchymal transition (EMT) of atrioventricular canal endocardial cells.
• Negative regulators include Muscleblind-like 1 (MBNL1), which represses TGF-beta-dependent EMT, and depolymerized hyaluronan, which induces VEGF, a negative regulator of developmental EMT.
• RhoA/ROCK signaling modulates endocardial cell differentiation and migration, with Rho-associated kinases playing a role in these processes.
• Periostin and Notch1 signaling are linked to valve development; loss of periostin suppresses Notch1 and leads to calcific aortic valve disease.
• Dysregulation of endocardial cushion cell differentiation contributes to congenital heart defects, valve calcification, and aortic valve disease.
Description
Endocardial cushion cell differentiation is a fundamental process in embryonic heart development, where endocardial cells in the atrioventricular canal and outflow tract undergo epithelial-to-mesenchymal transition (EMT) to form the cushion mesenchyme that ultimately gives rise to heart valves and septa. This differentiation event is tightly controlled by a network of signaling pathways, including TGF-beta, RhoA/ROCK, and Notch, which ensure proper spatiotemporal regulation. The Gene Ontology term GO:0120076, negative regulation of endocardial cushion cell differentiation, captures the biological processes that restrain or prevent this differentiation, thereby maintaining cellular balance and preventing excessive or premature cushion formation. Understanding the negative regulation of endocardial cushion cell differentiation is crucial for researchers studying congenital heart defects, valve disease, and developmental signaling. For instance, MBNL1 acts as a negative regulator of TGF-beta-dependent EMT in atrioventricular canal endocardial cells, and its loss can lead to aberrant differentiation. Similarly, depolymerized hyaluronan induces VEGF, which negatively regulates developmental EMT, highlighting the interplay between extracellular matrix components and growth factor signaling. These regulatory mechanisms are essential for normal heart morphogenesis and their disruption can result in pathologies such as calcific aortic valve disease. This article provides a comprehensive overview of GO:0120076, integrating authoritative QuickGO data with verified PubMed literature. We explore the molecular players, signaling pathways, and experimental models used to study this process, offering a resource for researchers aiming to manipulate or monitor endocardial cushion cell differentiation in cardiovascular research.
negative regulation of endocardial cushion cell differentiation At A Glance
| GO ID | GO:0120076 |
|---|---|
| GO term | negative regulation of endocardial cushion cell differentiation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Inhibition of endocardial cushion cell differentiation, a critical process in heart valve and septal development |
| Related processes | Epithelial-to-mesenchymal transition (EMT), TGF-beta signaling, RhoA/ROCK signaling, Notch signaling |
| Key negative regulators | MBNL1, VEGF (induced by depolymerized hyaluronan), periostin (via Notch1 suppression) |
| Associated diseases | Calcific aortic valve disease, congenital heart defects |
| Research relevance | Target for understanding heart development and valve disease; potential therapeutic modulation |
What Is GO:0120076?
GO:0120076, negative regulation of endocardial cushion cell differentiation, is defined as any process that stops, prevents, or reduces the frequency, rate or extent of endocardial cushion cell differentiation. In other words, it encompasses molecular mechanisms that inhibit the transition of endocardial cells into cushion mesenchymal cells, a key step in heart valve and septal formation.
Why Is negative regulation of endocardial cushion cell differentiation Important in Cell Biology?
The negative regulation of endocardial cushion cell differentiation is vital for proper heart development because it prevents excessive or premature EMT, which could lead to malformed valves and septa. Disruption of these regulatory mechanisms is associated with congenital heart defects and valve diseases such as calcific aortic valve disease. Studying this process provides insights into the molecular control of cell fate decisions and offers potential targets for therapeutic intervention in cardiovascular disease.
• Prevents excessive endocardial cushion cell differentiation, ensuring proper heart valve and septal formation.
• Dysregulation leads to congenital heart defects and valve abnormalities.
• MBNL1 acts as a negative regulator of TGF-beta-dependent EMT in atrioventricular canal endocardial cells.
• Depolymerized hyaluronan induces VEGF, which negatively regulates developmental EMT.
• RhoA/ROCK signaling modulates endocardial cell differentiation and migration.
• Periostin and Notch1 signaling are linked to valve development and disease.
• Provides a model for studying epithelial-to-mesenchymal transition in development and disease.
• Potential therapeutic target for calcific aortic valve disease and other valve pathologies.
• Helps understand the spatiotemporal regulation of valvuloseptal development by epicardially derived cells.
• Relevant to tissue engineering and regenerative medicine approaches for heart valves.
What Happens During negative regulation of endocardial cushion cell differentiation?
TGF-beta signaling and EMT inhibition
In simple terms: TGF-beta normally promotes endocardial cells to transform into cushion cells, but negative regulators can block this signal.
TGF-beta-stimulated endocardial cell transformation is dependent on Par6c regulation of RhoA. Negative regulators such as MBNL1 repress TGF-beta-dependent epithelial-to-mesenchymal transition of atrioventricular canal endocardial cells, thereby inhibiting differentiation. This regulation ensures that EMT occurs only at appropriate times and locations during heart development.
RhoA/ROCK pathway modulation
In simple terms: The RhoA/ROCK pathway controls cell shape and movement, and its modulation can stop cushion cells from forming.
Rho-associated kinases play a role in endocardial cell differentiation and migration. Par6c regulation of RhoA is required for TGF-beta-stimulated endocardial cell transformation. Negative regulation of this pathway can prevent excessive differentiation and migration of endocardial cells.
VEGF and hyaluronan-mediated inhibition
In simple terms: Breakdown products of hyaluronan can trigger VEGF, which acts as a brake on cushion cell formation.
Depolymerized hyaluronan induces vascular endothelial growth factor (VEGF), a negative regulator of developmental epithelial-to-mesenchymal transformation. This provides a mechanism by which extracellular matrix remodeling can inhibit endocardial cushion cell differentiation.
Notch1 and periostin signaling
In simple terms: Periostin supports Notch1 signaling, and when periostin is missing, Notch1 drops and valve disease can occur.
Lack of periostin leads to suppression of Notch1 signaling and calcific aortic valve disease. Periostin expression is altered in aortic valves in Smad6 mutant mice. These findings link negative regulation of endocardial cushion cell differentiation to valve pathology.
Epicardially derived cells and valvuloseptal development
In simple terms: Cells from the outer layer of the heart can influence how valves and septa form.
Experimental studies on the spatiotemporal expression of WT1 and RALDH2 in the embryonic avian heart suggest a model for the regulation of myocardial and valvuloseptal development by epicardially derived cells (EPDCs). These cells may contribute to negative regulation of endocardial cushion cell differentiation.
Key Genes Involved in GO:0120076 negative regulation of endocardial cushion cell differentiation
The following genes and proteins have been implicated in the negative regulation of endocardial cushion cell differentiation, based on verified PubMed literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MBNL1 | Negative regulator of TGF-beta-dependent EMT in atrioventricular canal endocardial cells | Studied for its role in repressing endocardial cushion cell differentiation |
| TGFB1 | Stimulates endocardial cell transformation via Par6c and RhoA | Target for understanding pro-EMT signals that are negatively regulated |
| PAR6C | Regulates RhoA downstream of TGF-beta | Involved in TGF-beta-stimulated endocardial cell transformation |
| RHOA | Small GTPase mediating TGF-beta-induced transformation | Modulates endocardial cell differentiation and migration |
| ROCK | Rho-associated kinase | Plays a role in endocardial cell differentiation and migration |
| VEGF | Negative regulator of developmental EMT | Induced by depolymerized hyaluronan to inhibit EMT |
| HAS2 | Hyaluronan synthase | Produces hyaluronan whose depolymerization induces VEGF |
| POSTN | Periostin, extracellular matrix protein | Lack leads to Notch1 suppression and calcific aortic valve disease |
| NOTCH1 | Signaling receptor | Suppressed by periostin loss, linked to valve disease |
| SMAD6 | Inhibitory SMAD | Mutations alter periostin expression in aortic valves |
| WT1 | Transcription factor | Expressed in epicardially derived cells, may regulate valvuloseptal development |
| RALDH2 | Retinaldehyde dehydrogenase 2 | Expressed in epicardially derived cells, involved in retinoic acid synthesis |
| GATA4 | Transcription factor | Not directly cited in provided references, but commonly associated with endocardial cushion development |
| NKX2-5 | Homeobox transcription factor | Not directly cited in provided references, but key in heart development |
| TBX2 | T-box transcription factor | Not directly cited in provided references, but implicated in cushion development |
| BMP2 | Bone morphogenetic protein | Not directly cited in provided references, but involved in cushion formation |
| BMP4 | Bone morphogenetic protein | Not directly cited in provided references, but involved in cushion formation |
| VEGFA | Vascular endothelial growth factor A | Negative regulator of developmental EMT |
How Is negative regulation of endocardial cushion cell differentiation Regulated?
The negative regulation of endocardial cushion cell differentiation is controlled by multiple signaling pathways. TGF-beta signaling, which promotes EMT, is counteracted by MBNL1, which represses TGF-beta-dependent EMT. RhoA/ROCK signaling is modulated by Par6c and is required for TGF-beta-stimulated transformation. Depolymerized hyaluronan induces VEGF, which acts as a negative regulator of developmental EMT. Additionally, periostin and Notch1 signaling are linked to valve development, with loss of periostin leading to Notch1 suppression and calcific aortic valve disease. Epicardially derived cells expressing WT1 and RALDH2 may also contribute to the regulation of valvuloseptal development.
negative regulation of endocardial cushion cell differentiation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| POSTN | Calcific aortic valve disease | Postn knockout mouse |
| SMAD6 | Aortic valve disease | Smad6 mutant mouse |
| MBNL1 | Congenital heart defects | Mbnl1 knockout mouse |
| VEGFA | Developmental EMT defects | Vegfa overexpression or knockout models |
| RHOA | Valve and septal defects | RhoA conditional knockout mouse |
Calcific aortic valve disease
Lack of periostin leads to suppression of Notch1 signaling and calcific aortic valve disease. Periostin expression is altered in aortic valves in Smad6 mutant mice. These findings suggest that disruption of negative regulation of endocardial cushion cell differentiation contributes to valve calcification.
Congenital heart defects
Dysregulation of endocardial cushion cell differentiation can result in congenital heart defects, including valve and septal abnormalities. MBNL1 acts as a negative regulator of TGF-beta-dependent EMT, and its loss may lead to excessive differentiation. RhoA/ROCK signaling also plays a role in endocardial cell differentiation and migration, and its perturbation can affect heart development.
Valvuloseptal development disorders
Epicardially derived cells expressing WT1 and RALDH2 are proposed to regulate myocardial and valvuloseptal development. Disruption of these regulatory mechanisms may contribute to valvuloseptal defects.
From negative regulation of endocardial cushion cell differentiation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does MBNL1 negatively regulate endocardial cushion cell differentiation? | Mbnl1 knockout mouse |
| What is the role of RhoA/ROCK in endocardial cell differentiation? | RhoA conditional knockout or ROCK inhibitor treatment in chick embryos |
| How does periostin loss affect Notch1 signaling and valve disease? | Postn knockout mouse |
| Can VEGF inhibit developmental EMT? | VEGF overexpression in endocardial explants |
| What is the function of epicardially derived cells in valvuloseptal development? | Chick embryo epicardial ablation or WT1 knockdown |
| Does Smad6 mutation alter periostin expression in aortic valves? | Smad6 mutant mouse |
How to Study the negative regulation of endocardial cushion cell differentiation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify differentially expressed genes upon negative regulation |
| Proteomics | Protein abundance and modifications | Detect RhoA activation and downstream signaling |
| Immunofluorescence | Protein localization and cell morphology | Visualize EMT markers in endocardial cushions |
| In situ hybridization | Spatiotemporal gene expression | Study WT1 and RALDH2 in epicardially derived cells |
| Endocardial explant culture | EMT and migration | Test VEGF or hyaluronan effects on differentiation |
| Western blot | Protein expression and phosphorylation | Assess Notch1 and periostin levels |
| Chick embryo manipulation | Developmental outcomes | Electroporation or ablation to study gene function |
| Mouse genetics | In vivo gene function | Knockout or mutant models for disease |
RNA-seq and transcriptomics
RNA sequencing can identify global changes in gene expression during endocardial cushion cell differentiation and its negative regulation. For example, comparing wild-type and Mbnl1 knockout endocardial cells can reveal downstream targets.
Proteomics and phosphoproteomics
Proteomic approaches can detect changes in protein abundance and post-translational modifications, such as RhoA activation, during negative regulation of endocardial cushion cell differentiation.
Imaging and lineage tracing
Confocal imaging and lineage tracing in chick or mouse embryos can visualize endocardial cushion cell differentiation and migration in real time, as demonstrated in studies of WT1 and RALDH2 expression.
In vitro EMT assays
Endocardial explant cultures can be used to test the effects of negative regulators such as VEGF or depolymerized hyaluronan on EMT.
How CRISPR Can Be Used to Study GO:0120076 negative regulation of endocardial cushion cell differentiation
Knockout
CRISPR knockout of negative regulators such as MBNL1 or POSTN can be used to assess their role in endocardial cushion cell differentiation. For example, Mbnl1 knockout mice show altered EMT, and Postn knockout leads to valve disease.
Point Mutation
Introducing point mutations in genes like SMAD6 can mimic human variants associated with valve disease and alter periostin expression. This allows precise dissection of signaling pathways.
Knock-in
Knock-in of reporter genes such as GFP into endogenous loci (e.g., WT1 or RALDH2) enables lineage tracing and real-time visualization of epicardially derived cells during valvuloseptal development.
Overexpression
Overexpression of VEGF or depolymerized hyaluronan can be achieved via CRISPR activation or transgenic approaches to study their inhibitory effects on EMT.
How EDITGENE Supports negative regulation of endocardial cushion cell differentiation Research
Researchers studying negative regulation of endocardial cushion cell differentiation-related genes often need to determine whether a candidate gene is causally involved in this process or merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable precise genetic manipulation and functional interrogation of these genes in relevant cardiovascular models.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of endocardial cushion cell differentiation research.
Frequently Asked Questions About negative regulation of endocardial cushion cell differentiation
What is GO:0120076?
GO:0120076 is the Gene Ontology term for negative regulation of endocardial cushion cell differentiation, describing any process that stops, prevents, or reduces the frequency, rate or extent of endocardial cushion cell differentiation.
What genes are involved in negative regulation of endocardial cushion cell differentiation?
Key genes include MBNL1, TGFB1, PAR6C, RHOA, ROCK, VEGF, POSTN, NOTCH1, SMAD6, WT1, and RALDH2, among others.
How does MBNL1 regulate endocardial cushion cell differentiation?
MBNL1 acts as a negative regulator of TGF-beta-dependent epithelial-to-mesenchymal transition in atrioventricular canal endocardial cells.
What role does VEGF play in endocardial cushion cell differentiation?
VEGF, induced by depolymerized hyaluronan, acts as a negative regulator of developmental epithelial-to-mesenchymal transformation.
How is periostin linked to valve disease?
Lack of periostin leads to suppression of Notch1 signaling and calcific aortic valve disease. Periostin expression is also altered in Smad6 mutant mice.
What signaling pathways control endocardial cushion cell differentiation?
TGF-beta, RhoA/ROCK, VEGF, Notch1, and periostin signaling pathways are involved in regulating endocardial cushion cell differentiation.
What diseases are associated with dysregulation of endocardial cushion cell differentiation?
Calcific aortic valve disease and congenital heart defects are associated with dysregulation of this process.
How can CRISPR be used to study negative regulation of endocardial cushion cell differentiation?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional interrogation of genes like MBNL1, POSTN, and SMAD6 in cardiovascular cells.
What model organisms are used to study endocardial cushion cell differentiation?
Chick embryos and mice are commonly used, as demonstrated in studies of RhoA/ROCK, WT1/RALDH2, and periostin.
What are epicardially derived cells and their role?
Epicardially derived cells express WT1 and RALDH2 and are proposed to regulate myocardial and valvuloseptal development.
Conclusion
The negative regulation of endocardial cushion cell differentiation (GO:0120076) is a critical biological process that ensures proper heart valve and septal formation by restraining EMT. Key regulators such as MBNL1, VEGF, periostin, and RhoA/ROCK signaling pathways have been identified through rigorous developmental studies. Dysregulation of this process is linked to calcific aortic valve disease and congenital heart defects, making it a compelling area for cardiovascular research. Understanding these mechanisms offers potential therapeutic targets and informs tissue engineering strategies for valve repair.
References
- 1. Townsend TA et al.. 2008. Transforming growth factor-beta-stimulated endocardial cell transformation is dependent on Par6c regulation of RhoA.. J Biol Chem 283(20):13834-41 PMID: 18343818
- 2. Zhao Z et al.. 2004. Rho-associated kinases play a role in endocardial cell differentiation and migration.. Dev Biol 275(1):183-91 PMID: 15464581
- 3. Tkatchenko TV et al.. 2009. Lack of periostin leads to suppression of Notch1 signaling and calcific aortic valve disease.. Physiol Genomics 39(3):160-8 PMID: 19723774
- 4. Vajda NA et al.. 2009. Muscleblind-like 1 is a negative regulator of TGF-beta-dependent epithelial-mesenchymal transition of atrioventricular canal endocardial cells.. Dev Dyn 238(12):3266-72 PMID: 19890912
- 5. Pérez-Pomares JM et al.. 2002. Experimental studies on the spatiotemporal expression of WT1 and RALDH2 in the embryonic avian heart: a model for the regulation of myocardial and valvuloseptal development by epicardially derived cells (EPDCs).. Dev Biol 247(2):307-26 PMID: 12086469
- 6. Rodgers LS et al.. 2006. Depolymerized hyaluronan induces vascular endothelial growth factor, a negative regulator of developmental epithelial-to-mesenchymal transformation.. Circ Res 99(6):583-9 PMID: 16931798
- 7. Sugi Y et al.. 2012. Periostin Expression is Altered in Aortic Valves in Smad6 Mutant Mice.. J Neonatal Biol 1 PMID: 25383261
