GO:1905460 negative regulation of vascular associated smooth muscle cell apoptotic process: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905460 describes any process that stops, prevents or reduces the frequency, rate or extent of vascular associated smooth muscle cell (VSMC) apoptotic process.
• VSMC apoptosis is a double-edged sword: excessive apoptosis destabilizes atherosclerotic plaques, while insufficient apoptosis promotes neointimal hyperplasia and aneurysm formation.
• Hydrogen sulfide produced by VSMCs promotes plaque stability by activating TFEB-mediated autophagy, which suppresses VSMC apoptosis.
• The paraspeckle protein NONO attenuates vascular calcification by inhibiting BMP2 transcription, thereby reducing VSMC apoptosis.
• Loss of Ncf1 in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm and dissection via STING pathway activation and increased apoptosis.
• Smad2 inhibition of MET transcription potentiates human VSMC apoptosis, revealing a TGF-beta-Smad2-MET axis that controls VSMC survival.
Description
The Gene Ontology term GO:1905460, negative regulation of vascular associated smooth muscle cell apoptotic process, refers to any biological process that stops, prevents or reduces the frequency, rate or extent of programmed cell death in vascular smooth muscle cells (VSMCs). VSMCs are the predominant cell type in the arterial media, and their survival is critical for maintaining vascular tone, extracellular matrix integrity, and plaque stability. Dysregulated VSMC apoptosis contributes to a spectrum of vascular pathologies, including atherosclerosis, aortic aneurysm, and vascular calcification. Understanding the molecular mechanisms that negatively regulate VSMC apoptosis is therefore essential for developing targeted therapies. This article synthesizes published literature to describe the definition, mechanisms, key genes, disease relevance, and research methods associated with GO:1905460.
negative regulation of vascular associated smooth muscle cell apoptotic process At A Glance
| GO ID | GO:1905460 |
|---|---|
| GO term | negative regulation of vascular associated smooth muscle cell apoptotic process |
| Ontology | biological_process |
| Synonym | inhibition of VSMC apoptosis; downregulation of vascular smooth muscle cell apoptotic process; negative regulation of VSMC apoptotic process |
| Major function | Suppression of programmed cell death in vascular smooth muscle cells |
| Related processes | Autophagy, TGF-beta signaling, STING pathway, BMP2 transcription, PI3K/Akt signaling |
| Disease relevance | Atherosclerosis, aortic aneurysm, vascular calcification, restenosis |
| Research methods | CRISPR knockout, RNA-seq, flow cytometry, TUNEL assay, Western blot |
What Is GO:1905460?
GO:1905460 is a biological process term defined as any process that stops, prevents or reduces the frequency, rate or extent of vascular associated smooth muscle cell apoptotic process. In simpler terms, it encompasses all cellular signaling events that protect VSMCs from undergoing programmed cell death. This includes survival signaling pathways, autophagy-mediated cytoprotection, inhibition of pro-apoptotic transcription factors, and maintenance of mitochondrial integrity.
Why Is negative regulation of vascular associated smooth muscle cell apoptotic process Important in Cell Biology?
GO:1905460 is critically important because VSMC apoptosis is a central event in vascular disease pathogenesis. Excessive VSMC apoptosis leads to plaque instability, aneurysm formation, and vascular calcification, while insufficient apoptosis contributes to neointimal hyperplasia and restenosis. The balance between pro- and anti-apoptotic signals in VSMCs determines clinical outcomes in cardiovascular disease. Identifying the molecular players that negatively regulate VSMC apoptosis provides therapeutic targets for stabilizing atherosclerotic plaques, preventing aneurysm rupture, and limiting vascular calcification.
• VSMC apoptosis destabilizes atherosclerotic plaques by reducing collagen synthesis and fibrous cap thickness.
• Loss of negative regulation of VSMC apoptosis contributes to aortic aneurysm and dissection.
• Vascular calcification is exacerbated when VSMC apoptosis is not properly suppressed.
• Hydrogen sulfide produced by VSMCs activates TFEB-mediated autophagy to inhibit apoptosis and promote plaque stability.
• NONO attenuates vascular calcification by inhibiting BMP2 transcription, thereby reducing VSMC apoptosis.
• Ncf1 deficiency in smooth muscle cells activates the STING pathway and exacerbates angiotensin II-induced aortic aneurysm.
• Smad2 inhibition of MET transcription potentiates human VSMC apoptosis, linking TGF-beta signaling to VSMC survival.
• PI3K-dependent pathways modulate Bad phosphorylation to regulate VSMC apoptosis.
• p53 regulates podosome formation and invasion in VSMCs, influencing vascular remodeling.
• KCNMB1 reduction leads to VSMC phenotypic switch and apoptosis, contributing to vascular dysfunction.
What Happens During negative regulation of vascular associated smooth muscle cell apoptotic process?
Initiation of Survival Signaling
In simple terms: The cell receives signals that tell it to stay alive.
Negative regulation of VSMC apoptosis begins with the activation of survival signaling pathways. Growth factors and cytokines activate receptor tyrosine kinases, which in turn stimulate phosphatidylinositol 3-kinase (PI3K) and Akt. Akt phosphorylates and inactivates pro-apoptotic proteins such as Bad, preventing mitochondrial outer membrane permeabilization and cytochrome c release. This PI3K-dependent pathway is a key mechanism by which VSMCs are protected from apoptosis.
Autophagy-Mediated Cytoprotection
In simple terms: The cell recycles its own components to survive stress.
Autophagy is a catabolic process that degrades damaged organelles and proteins, providing energy and reducing oxidative stress. In VSMCs, hydrogen sulfide (H2S) produced by cystathionine gamma-lyase promotes plaque stability by activating TFEB (transcription factor EB)-mediated autophagy, which suppresses apoptosis. TFEB is a master regulator of lysosomal biogenesis and autophagy gene expression. This H2S-TFEB-autophagy axis represents a critical negative regulatory mechanism for VSMC apoptosis.
Transcriptional Control of Pro-Apoptotic Genes
In simple terms: The cell turns off genes that would cause it to die.
Negative regulation of VSMC apoptosis involves transcriptional suppression of pro-apoptotic genes. The paraspeckle protein NONO attenuates vascular calcification by inhibiting bone morphogenetic protein 2 (BMP2) transcription. BMP2 is a pro-apoptotic and pro-calcific factor in VSMCs. By repressing BMP2 transcription, NONO reduces VSMC apoptosis and calcification. Similarly, Smad2 inhibition of MET transcription potentiates human VSMC apoptosis, indicating that MET signaling is protective and its suppression promotes cell death.
Inhibition of Inflammatory and Stress Pathways
In simple terms: The cell blocks danger signals that trigger death.
The STING pathway is a cytosolic DNA-sensing innate immune pathway that can induce apoptosis. Ncf1 knockout in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm and dissection by activating the STING pathway. Ncf1 (neutrophil cytosolic factor 1) is a component of NADPH oxidase. Its loss leads to increased oxidative stress and STING activation, promoting VSMC apoptosis and aneurysm formation. Thus, Ncf1-mediated suppression of STING is a negative regulatory mechanism for VSMC apoptosis.
Maintenance of Mitochondrial Integrity
In simple terms: The cell keeps its power plants healthy to avoid death.
Mitochondrial dysfunction is a hallmark of apoptosis. Negative regulation of VSMC apoptosis involves maintaining mitochondrial membrane potential and preventing the release of pro-apoptotic factors. The PI3K/Akt pathway phosphorylates Bad, preventing its translocation to mitochondria and subsequent cytochrome c release. Additionally, p53 regulates podosome formation and invasion in VSMCs, influencing vascular remodeling and survival. Reduced expression of KCNMB1, a calcium-activated potassium channel subunit, leads to VSMC phenotypic switch and apoptosis, indicating that ion channel function is important for survival.
Key Genes Involved in GO:1905460 negative regulation of vascular associated smooth muscle cell apoptotic process
The following genes and proteins have been experimentally implicated in the negative regulation of vascular associated smooth muscle cell apoptotic process.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TFEB | Transcription factor EB; activates autophagy and lysosomal biogenesis | Mediates H2S-induced VSMC survival and plaque stability |
| NONO | Paraspeckle protein; inhibits BMP2 transcription | Attenuates vascular calcification and VSMC apoptosis |
| Ncf1 | NADPH oxidase component; suppresses STING pathway | Knockout exacerbates aortic aneurysm via STING activation |
| KCNMB1 | Calcium-activated potassium channel subunit | Reduced expression leads to VSMC phenotypic switch and apoptosis |
| Smad2 | TGF-beta signaling effector; inhibits MET transcription | Smad2 inhibition potentiates VSMC apoptosis |
| MET | Receptor tyrosine kinase; promotes cell survival | Smad2-mediated repression potentiates apoptosis |
| Bad | Pro-apoptotic Bcl-2 family member | Phosphorylated and inactivated by PI3K/Akt pathway |
| PI3K | Phosphatidylinositol 3-kinase; activates Akt | PI3K-dependent pathway modulates Bad to regulate VSMC apoptosis |
| Akt | Serine/threonine kinase; phosphorylates Bad | Survival kinase downstream of PI3K |
| p53 | Tumor suppressor; regulates podosome formation | Influences VSMC invasion and vascular remodeling |
| BMP2 | Bone morphogenetic protein 2; pro-apoptotic and pro-calcific | Transcriptionally repressed by NONO |
| STING | Stimulator of interferon genes; innate immune sensor | Activated by Ncf1 loss to promote VSMC apoptosis |
| Cystathionine gamma-lyase | H2S-producing enzyme | Produces H2S that activates TFEB and autophagy |
| H2S | Hydrogen sulfide; gasotransmitter | Promotes plaque stability via TFEB-mediated autophagy |
| Angiotensin II | Vasoactive peptide hormone | Induces aortic aneurysm via Ncf1/STING pathway |
| TGF-beta | Transforming growth factor beta | Signals through Smad2 to regulate VSMC apoptosis |
| Cytochrome c | Mitochondrial pro-apoptotic factor | Released upon mitochondrial permeabilization |
How Is negative regulation of vascular associated smooth muscle cell apoptotic process Regulated?
The negative regulation of VSMC apoptosis is controlled by multiple signaling pathways. The PI3K/Akt pathway phosphorylates Bad, preventing its pro-apoptotic function. Hydrogen sulfide activates TFEB-mediated autophagy, which suppresses apoptosis. NONO inhibits BMP2 transcription to reduce apoptosis. Ncf1 suppresses STING pathway activation. Smad2 inhibits MET transcription, and loss of this inhibition potentiates apoptosis. These pathways converge on mitochondrial integrity and transcriptional control of pro-apoptotic genes.
negative regulation of vascular associated smooth muscle cell apoptotic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TFEB | Atherosclerosis plaque stability | VSMC-specific TFEB knockout or overexpression in ApoE-/- mice |
| NONO | Vascular calcification | VSMC-specific NONO knockout in CKD mouse models |
| Ncf1 | Aortic aneurysm and dissection | Smooth muscle cell-specific Ncf1 knockout in angiotensin II-infused mice |
| KCNMB1 | VSMC phenotypic switch and apoptosis | KCNMB1 knockout or knockdown in cultured VSMCs |
| Smad2 | VSMC apoptosis and neointimal hyperplasia | Smad2 knockdown in human VSMCs |
Atherosclerosis and Plaque Stability
VSMC apoptosis is a critical determinant of atherosclerotic plaque stability. Excessive VSMC apoptosis reduces collagen synthesis and fibrous cap thickness, leading to plaque rupture and acute cardiovascular events. Hydrogen sulfide produced by VSMCs promotes plaque stability by activating TFEB-mediated autophagy, which negatively regulates VSMC apoptosis. Therefore, enhancing negative regulation of VSMC apoptosis is a therapeutic strategy for stabilizing plaques.
Aortic Aneurysm and Dissection
Loss of negative regulation of VSMC apoptosis contributes to aortic aneurysm and dissection. Ncf1 knockout in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm and dissection by activating the STING pathway, which promotes VSMC apoptosis. This highlights the importance of Ncf1-mediated suppression of STING in maintaining VSMC survival and aortic wall integrity.
Vascular Calcification
Vascular calcification is associated with VSMC apoptosis and osteogenic differentiation. The paraspeckle protein NONO attenuates vascular calcification by inhibiting BMP2 transcription, thereby reducing VSMC apoptosis. BMP2 is a pro-apoptotic and pro-calcific factor. Loss of NONO leads to increased BMP2 expression, VSMC apoptosis, and calcification.
Neointimal Hyperplasia and Restenosis
Insufficient VSMC apoptosis contributes to neointimal hyperplasia and restenosis after vascular injury. Reduced expression of KCNMB1 leads to VSMC phenotypic switch and apoptosis, but the balance between proliferation and apoptosis determines neointimal formation. Smad2 inhibition of MET transcription potentiates human VSMC apoptosis, suggesting that TGF-beta signaling restrains apoptosis to limit neointimal growth.
From negative regulation of vascular associated smooth muscle cell apoptotic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate VSMC apoptosis? | CRISPR knockout of gene X in VSMCs followed by apoptosis induction and flow cytometry |
| Does a point mutation in gene X affect its anti-apoptotic function? | CRISPR point mutation knock-in in VSMCs |
| Does overexpression of gene X protect VSMCs from apoptosis? | Lentiviral overexpression of gene X in VSMCs |
| Does a tagged version of protein X localize to specific compartments? | Knock-in of fluorescent or epitope tag at endogenous locus |
| Does gene X regulate apoptosis in vivo? | Smooth muscle cell-specific conditional knockout mice |
| Does gene X interact with pathway Y? | Co-immunoprecipitation and proximity ligation in VSMCs |
How to Study the negative regulation of vascular associated smooth muscle cell apoptotic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Annexin V/PI flow cytometry | Apoptotic and necrotic cell populations | Quantify VSMC apoptosis after gene knockout |
| TUNEL assay | DNA fragmentation in situ | Detect apoptosis in tissue sections |
| Western blot | Protein expression and cleavage | Measure Bad, Bcl-2, cleaved caspase-3 |
| Immunoprecipitation | Protein-protein interactions and phosphorylation | Assess Bad phosphorylation by Akt |
| RNA-seq | Global transcriptional changes | Identify pathways regulated by TFEB |
| LC3B flux assay | Autophagic activity | Measure TFEB-mediated autophagy |
| Immunofluorescence | Protein localization and expression | Detect NONO and BMP2 in VSMCs |
| CRISPR knockout | Gene function loss | Test causal role of candidate genes |
Flow Cytometry and TUNEL Assay
Flow cytometry with Annexin V/propidium iodide staining is widely used to quantify VSMC apoptosis. TUNEL assay detects DNA fragmentation in situ. These methods are used to assess the effect of gene knockout or overexpression on VSMC apoptosis.
Western Blot and Immunoprecipitation
Western blot is used to measure levels of pro- and anti-apoptotic proteins such as Bad, Bcl-2, and cleaved caspase-3. Immunoprecipitation can assess phosphorylation status of Bad and interactions between signaling proteins.
RNA-seq and Transcriptomics
RNA sequencing can identify transcriptional changes in VSMCs upon genetic manipulation. This is useful for discovering novel negative regulators of apoptosis and for validating pathways such as TFEB-mediated autophagy.
Autophagy Flux Assays
LC3B-II levels, p62 degradation, and GFP-LC3 puncta formation are used to measure autophagic flux. These assays are critical for studying TFEB-mediated autophagy in VSMC survival.
How CRISPR Can Be Used to Study GO:1905460 negative regulation of vascular associated smooth muscle cell apoptotic process
Knockout
CRISPR knockout of candidate genes in VSMCs is used to determine whether they are required for negative regulation of apoptosis. For example, Ncf1 knockout in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm by activating the STING pathway. Knockout of TFEB would impair autophagy and increase apoptosis.
Point Mutation
CRISPR point mutation knock-in can be used to test the functional significance of specific phosphorylation sites or domains. For instance, mutating the Akt phosphorylation sites on Bad would prevent its inactivation and promote apoptosis. Point mutations in Smad2 could disrupt its inhibition of MET transcription.
Knock-in
Knock-in of fluorescent or epitope tags at endogenous loci allows visualization and purification of proteins such as TFEB or NONO. This enables studies of their localization, dynamics, and interactomes in VSMCs.
Overexpression
CRISPR activation or lentiviral overexpression of anti-apoptotic genes such as TFEB or NONO can protect VSMCs from apoptosis. Overexpression of NONO reduces BMP2 transcription and calcification. Overexpression of TFEB enhances autophagy and plaque stability.
How EDITGENE Supports negative regulation of vascular associated smooth muscle cell apoptotic process Research
Researchers studying negative regulation of vascular associated smooth muscle cell apoptotic process-related genes often need to determine whether a candidate gene is causally involved in VSMC survival or death. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of vascular associated smooth muscle cell apoptotic process research.
Frequently Asked Questions About negative regulation of vascular associated smooth muscle cell apoptotic process
What is GO:1905460?
GO:1905460 is a Gene Ontology biological process term defined as any process that stops, prevents or reduces the frequency, rate or extent of vascular associated smooth muscle cell apoptotic process.
What genes are involved in negative regulation of VSMC apoptosis?
Key genes include TFEB, NONO, Ncf1, KCNMB1, Smad2, MET, Bad, PI3K, Akt, and p53.
How does hydrogen sulfide regulate VSMC apoptosis?
Hydrogen sulfide produced by VSMCs activates TFEB-mediated autophagy, which suppresses apoptosis and promotes atherosclerotic plaque stability.
What is the role of NONO in vascular calcification?
NONO attenuates vascular calcification by inhibiting BMP2 transcription, thereby reducing VSMC apoptosis.
How does Ncf1 affect aortic aneurysm?
Ncf1 knockout in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm and dissection by activating the STING pathway and promoting VSMC apoptosis.
What is the role of Smad2 in VSMC apoptosis?
Smad2 inhibition of MET transcription potentiates human VSMC apoptosis, indicating that Smad2 signaling is protective.
How is Bad regulated in VSMCs?
Bad is phosphorylated and inactivated by a phosphatidylinositol 3-kinase-dependent pathway, preventing apoptosis.
What methods are used to study VSMC apoptosis?
Common methods include flow cytometry with Annexin V/PI, TUNEL assay, Western blot, RNA-seq, and autophagy flux assays.
What diseases are associated with dysregulated VSMC apoptosis?
Atherosclerosis, aortic aneurysm, vascular calcification, and neointimal hyperplasia are associated with dysregulated VSMC apoptosis.
How can CRISPR be used to study negative regulation of VSMC apoptosis?
CRISPR knockout, point mutation knock-in, knock-in tagging, and overexpression can be used to test the causal role of candidate genes in VSMC survival.
Conclusion
GO:1905460, negative regulation of vascular associated smooth muscle cell apoptotic process, is a critical biological process that maintains vascular homeostasis. Dysregulation of this process contributes to atherosclerosis, aortic aneurysm, vascular calcification, and restenosis. Key molecular players include TFEB, NONO, Ncf1, Smad2, and the PI3K/Akt/Bad pathway. Understanding these mechanisms provides opportunities for therapeutic intervention. EDITGENE offers comprehensive CRISPR services to accelerate research in this field.
References
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- 2. Lu Y et al.. 2024. Paraspeckle protein NONO attenuates vascular calcification by inhibiting bone morphogenetic protein 2 transcription.. Kidney Int 105(6):1221-1238 PMID: 38417578
- 3. Liu H et al.. 2024. Ncf1 knockout in smooth muscle cells exacerbates angiotensin II-induced aortic aneurysm and dissection by activating the STING pathway.. Cardiovasc Res 120(9):1081-1096 PMID: 38639325
- 4. Liu H et al.. 2025. Reduced expression of KCNMB1 leads to vascular smooth muscle cell phenotypic switch and apoptosis.. Biochem Pharmacol 241:117151 PMID: 40653026
- 6. Xie X et al.. 2021. Smad2 inhibition of MET transcription potentiates human vascular smooth muscle cell apoptosis.. Atheroscler Plus 44:31-42 PMID: 35445204
- 7. Mak AS. 2011. p53 regulation of podosome formation and cellular invasion in vascular smooth muscle cells.. Cell Adh Migr 5(2):144-9 PMID: 21164280
- 8. Bai Hz et al.. 1999. Regulation of vascular smooth muscle cell apoptosis. Modulation of bad by a phosphatidylinositol 3-kinase-dependent pathway.. Circ Res 85(3):229-37 PMID: 10436165
