GO:0034390 smooth muscle cell apoptotic process: Vascular Remodeling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034390 describes the apoptotic process occurring in smooth muscle cells, which are non-striated, elongated cells lining the digestive tract, uterus, and blood vessels.
• Vascular smooth muscle cell apoptosis is a central driver of aortic dissection, abdominal aortic aneurysm, and atherosclerosis, and is tightly regulated by ER stress, RhoA/YAP, MAPK14, and TFEB signaling.
• EDIL3/Del-1 promotes internalization and degradation of apoptotic vascular smooth muscle cells, and its failure contributes to aortic dissection.
• Oral pathogens can aggravate atherosclerosis by inducing smooth muscle cell apoptosis while repressing macrophage efferocytosis.
• Key genes in this process include ATF3, ATF4, MAPK14, TFEB, YAP, and EDIL3, which serve as candidate targets for CRISPR knockout, knock-in, and overexpression studies.
• CRISPR-based models enable causal testing of these genes in smooth muscle cell apoptosis and related vascular diseases.
Description
Smooth muscle cell apoptotic process (GO:0034390) is defined as any apoptotic process in a smooth muscle cell, where smooth muscle consists of non-striated, elongated, spindle-shaped cells found lining the digestive tract, uterus, and blood vessels. Apoptosis of these cells is a genetically controlled form of programmed cell death that is essential for normal vascular remodeling but becomes pathological when dysregulated. In the vasculature, excessive or defective smooth muscle cell apoptosis contributes to diseases such as aortic dissection, abdominal aortic aneurysm (AAA), atherosclerosis, and restenosis. Research into GO:0034390 has revealed that smooth muscle cell apoptosis is not a passive event but is actively regulated by multiple signaling pathways, including endoplasmic reticulum (ER) stress, RhoA/YAP signaling, MAPK14-dependent transcriptional programs, and TFEB-mediated autophagy-lysosomal function. For example, inhibition of PERK/ATF4 ER stress signaling in vascular smooth muscle cells protects against abdominal aortic aneurysms, while spatiotemporal ATF3 expression determines vascular smooth muscle cell fate in AAA. These findings highlight the importance of understanding the molecular switches that control smooth muscle cell apoptosis. The clearance of apoptotic smooth muscle cells is equally important. EDIL3/Del-1 enhances internalization and degradation of apoptotic vascular smooth muscle cells, and its deficiency predisposes to aortic dissection. Conversely, oral pathogens can aggravate atherosclerosis by inducing smooth muscle cell apoptosis and repressing macrophage efferocytosis. Thus, GO:0034390 encompasses both the intrinsic death machinery and the subsequent clearance mechanisms that together determine tissue outcomes. This article provides a research-grade overview of the definition, mechanisms, key genes, disease links, and experimental methods for studying smooth muscle cell apoptotic process.
smooth muscle cell apoptotic process At A Glance
| GO ID | GO:0034390 |
|---|---|
| GO term | smooth muscle cell apoptotic process |
| Ontology | biological_process |
| Synonym | SMC apoptosis; smooth muscle cell apoptosis; programmed cell death of smooth muscle cells by apoptosis |
| Major function | Regulated cell death of smooth muscle cells in vascular, digestive, and uterine tissues |
| Definition | Any apoptotic process in a smooth muscle cell; smooth muscle consists of non-striated, elongated, spindle-shaped cells found lining the digestive tract, uterus, and blood vessels |
| Related diseases | Aortic dissection, abdominal aortic aneurysm, atherosclerosis, restenosis |
| Key signaling pathways | ER stress (PERK/ATF4), RhoA/YAP, MAPK14, TFEB, EDIL3/Del-1 |
What Is GO:0034390?
GO:0034390, smooth muscle cell apoptotic process, refers to any apoptotic process that takes place in a smooth muscle cell. Smooth muscle cells are non-striated, elongated, spindle-shaped cells that line the digestive tract, uterus, and blood vessels. The term encompasses the biochemical and morphological changes of apoptosis, including cell shrinkage, membrane blebbing, and DNA fragmentation, specifically within this cell type. It is a biological process term in the Gene Ontology, with synonyms including SMC apoptosis, smooth muscle cell apoptosis, and programmed cell death of smooth muscle cells by apoptosis.
Why Is smooth muscle cell apoptotic process Important in Cell Biology?
Smooth muscle cell apoptotic process is critically important because dysregulated apoptosis of smooth muscle cells is a hallmark of major vascular diseases. In abdominal aortic aneurysm, vascular smooth muscle cell apoptosis weakens the aortic wall, leading to dilation and rupture. In aortic dissection, impaired clearance of apoptotic smooth muscle cells contributes to tissue destruction. In atherosclerosis, pathogen-induced smooth muscle cell apoptosis exacerbates plaque instability. In restenosis after stent placement, inhibition of RhoA/YAP signaling reduces smooth muscle cell apoptosis and restenosis. Therefore, understanding GO:0034390 provides mechanistic insight into disease pathogenesis and identifies potential therapeutic targets.
• Smooth muscle cell apoptosis is a key driver of abdominal aortic aneurysm pathogenesis.
• Impaired clearance of apoptotic vascular smooth muscle cells contributes to aortic dissection.
• Oral pathogens can induce smooth muscle cell apoptosis and aggravate atherosclerosis.
• RhoA inhibitor-eluting stents attenuate restenosis by inhibiting YAP signaling and smooth muscle cell apoptosis.
• ER stress signaling through PERK/ATF4 promotes smooth muscle cell apoptosis in AAA.
• ATF3 expression dynamics determine vascular smooth muscle cell fate in AAA.
• MAPK14 converges on transcriptional machinery to promote vascular smooth muscle cell degeneration.
• TFEB activation protects against AAA by modulating vascular smooth muscle cell function.
• EDIL3/Del-1 enhances internalization and degradation of apoptotic vascular smooth muscle cells.
• Targeting smooth muscle cell apoptosis pathways offers therapeutic potential for vascular diseases.
What Happens During smooth muscle cell apoptotic process?
Initiation of Apoptosis in Smooth Muscle Cells
In simple terms: The cell receives a death signal that starts the self-destruction program.
Apoptosis in smooth muscle cells can be initiated by intrinsic stressors such as ER stress, oxidative stress, or extrinsic signals from the microenvironment. In vascular smooth muscle cells, PERK/ATF4 ER stress signaling is activated in response to stress and promotes apoptosis, contributing to abdominal aortic aneurysm. Spatiotemporal expression of ATF3, a stress-responsive transcription factor, determines whether vascular smooth muscle cells survive or undergo apoptosis in AAA. These initiation events involve transcriptional reprogramming that tips the balance toward cell death.
Mitochondrial Outer Membrane Permeabilization and Caspase Activation
In simple terms: The mitochondria release factors that activate executioner enzymes.
Following initiation, the intrinsic apoptotic pathway involves mitochondrial outer membrane permeabilization, release of cytochrome c, and activation of caspases. In smooth muscle cells, this cascade is regulated by Bcl-2 family proteins and can be modulated by signaling pathways such as RhoA/YAP. Inhibition of RhoA signaling with an inhibitor-eluting stent attenuates restenosis by inhibiting YAP and reducing smooth muscle cell apoptosis. MAPK14 also converges on key transcriptional machinery to promote vascular smooth muscle cell degeneration, likely through regulation of apoptotic gene programs.
Clearance of Apoptotic Smooth Muscle Cells
In simple terms: Dying cells are recognized and removed by neighboring cells.
Apoptotic smooth muscle cells expose phosphatidylserine and other eat-me signals that mediate recognition and internalization by phagocytes. EDIL3/Del-1 enhances internalization and degradation of apoptotic vascular smooth muscle cells, and its deficiency prevents efficient clearance, leading to aortic dissection. In atherosclerosis, oral pathogens can repress macrophage efferocytosis, impairing clearance of apoptotic smooth muscle cells and exacerbating plaque necrosis. Thus, defective clearance is a critical component of the pathological outcome.
Autophagy-Lysosomal Regulation of Smooth Muscle Cell Fate
In simple terms: The cell's recycling system influences whether it lives or dies.
Transcription factor EB (TFEB) is a master regulator of autophagy and lysosomal biogenesis. Activation of TFEB in vascular smooth muscle cells prevents abdominal aortic aneurysm, in part by maintaining cellular homeostasis and reducing apoptosis. Cyclodextrin, which activates TFEB, protects against AAA in preclinical models. This highlights crosstalk between autophagy-lysosomal pathways and apoptotic machinery in smooth muscle cells.
Transcriptional and Signaling Integration
In simple terms: Multiple signals converge on the nucleus to decide the cell's fate.
The decision to undergo apoptosis in smooth muscle cells is integrated at the transcriptional level. ATF3 expression dynamics determine vascular smooth muscle cell fate in AAA, with sustained or inappropriate expression promoting degeneration. MAPK14 (p38alpha) converges on key transcriptional machinery to promote vascular smooth muscle cell degeneration. These pathways offer multiple entry points for therapeutic intervention and for CRISPR-based functional studies.
Key Genes Involved in GO:0034390 smooth muscle cell apoptotic process
The following genes and proteins have been experimentally implicated in smooth muscle cell apoptotic process (GO:0034390) and related vascular pathology.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATF3 | Stress-responsive transcription factor determining VSMC fate | Spatiotemporal expression in AAA; knockout/overexpression models |
| ATF4 | ER stress effector downstream of PERK | Inhibition of PERK/ATF4 protects against AAA |
| MAPK14 | p38alpha kinase converging on transcriptional machinery | Promotes VSMC degeneration in AAA |
| TFEB | Master regulator of autophagy-lysosomal biogenesis | Activation prevents AAA via VSMC protection |
| YAP | Hippo pathway effector mediating mechanotransduction | RhoA inhibitor-eluting stent attenuates restenosis via YAP inhibition |
| EDIL3 | Secreted protein enhancing clearance of apoptotic cells | Deficiency predisposes to aortic dissection |
| RhoA | Small GTPase regulating cytoskeleton and YAP signaling | Target of inhibitor-eluting stent in restenosis |
| PERK | ER stress kinase phosphorylating eIF2alpha | Inhibition protects against AAA |
| Bcl-2 family | Regulators of mitochondrial outer membrane permeabilization | Core apoptotic machinery in SMCs |
| Caspases | Executioner proteases of apoptosis | Mediate SMC apoptosis |
| p53 | Tumor suppressor and transcription factor | Can induce apoptosis in SMCs under stress |
| NF-kB | Inflammatory transcription factor | Modulates SMC survival and apoptosis |
| TGF-beta | Cytokine regulating SMC phenotype and survival | Context-dependent effects on SMC apoptosis |
| Angiotensin II | Vasoactive peptide inducing SMC apoptosis | Used experimentally to induce AAA models |
| Oxidative stress mediators | ROS and related molecules | Induce SMC apoptosis in vascular disease |
| Macrophage efferocytosis receptors | Mediate clearance of apoptotic SMCs | Impaired by oral pathogens in atherosclerosis |
How Is smooth muscle cell apoptotic process Regulated?
Smooth muscle cell apoptotic process is regulated by multiple signaling pathways. The PERK/ATF4 arm of the unfolded protein response promotes apoptosis under ER stress, and its inhibition protects against abdominal aortic aneurysm. RhoA/YAP signaling modulates apoptosis in restenosis, with RhoA inhibition reducing YAP activity and apoptosis. MAPK14 (p38alpha) converges on transcriptional machinery to promote vascular smooth muscle cell degeneration. TFEB-mediated autophagy-lysosomal activation protects against AAA, suggesting that autophagy can antagonize apoptosis. ATF3 expression dynamics act as a fate switch in AAA. Additionally, clearance of apoptotic cells by EDIL3/Del-1 and macrophage efferocytosis regulates the inflammatory consequences of apoptosis.
smooth muscle cell apoptotic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ATF3 | Abdominal aortic aneurysm | VSMC-specific knockout or overexpression in mouse AAA models |
| ATF4 | Abdominal aortic aneurysm | PERK/ATF4 inhibition in VSMC cultures and mouse models |
| MAPK14 | Abdominal aortic aneurysm | MAPK14 knockout or pharmacological inhibition in VSMCs |
| TFEB | Abdominal aortic aneurysm | TFEB overexpression or cyclodextrin treatment in mouse AAA models |
| EDIL3 | Aortic dissection | EDIL3 knockout or knock-in in mouse models of aortic dissection |
Abdominal Aortic Aneurysm (AAA)
Abdominal aortic aneurysm is characterized by progressive weakening and dilation of the aortic wall, in which vascular smooth muscle cell apoptosis plays a central role. Inhibition of PERK/ATF4 ER stress signaling in vascular smooth muscle cells protects against AAA. Spatiotemporal ATF3 expression determines VSMC fate in AAA, with ATF3 acting as a critical regulator. MAPK14 promotes vascular smooth muscle cell degeneration in AAA. Activation of TFEB by cyclodextrin prevents AAA via vascular smooth muscle cell protection. These studies establish smooth muscle cell apoptosis as a key pathogenic mechanism in AAA.
Aortic Dissection
Aortic dissection involves tearing of the aortic wall and is associated with defective clearance of apoptotic vascular smooth muscle cells. EDIL3/Del-1 prevents aortic dissection through enhancing internalization and degradation of apoptotic vascular smooth muscle cells. This highlights the importance of efferocytosis in preventing the accumulation of apoptotic debris and subsequent tissue destruction.
Atherosclerosis
Atherosclerosis is a chronic inflammatory disease in which smooth muscle cell apoptosis contributes to plaque instability. Oral pathogens can aggravate atherosclerosis by inducing smooth muscle cell apoptosis and repressing macrophage efferocytosis. This dual mechanism leads to increased necrotic core formation and plaque vulnerability.
Restenosis
Restenosis after vascular intervention involves excessive smooth muscle cell proliferation and apoptosis. RhoA inhibitor-eluting stents attenuate restenosis by inhibiting YAP signaling, which reduces smooth muscle cell apoptosis and neointimal formation. This demonstrates that modulating apoptotic pathways can improve clinical outcomes after stent placement.
From smooth muscle cell apoptotic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ATF3 in VSMCs affect apoptosis and AAA progression? | VSMC-specific ATF3 knockout mouse |
| Can point mutation of ATF4 phosphorylation sites alter ER stress-induced apoptosis? | ATF4 point-mutation knock-in in VSMCs |
| Does TFEB overexpression protect against AAA? | TFEB overexpression or tagged knock-in in mouse VSMCs |
| What is the role of MAPK14 in VSMC degeneration? | MAPK14 knockout or kinase-dead knock-in in VSMCs |
| Does EDIL3 enhance clearance of apoptotic VSMCs? | EDIL3 knockout and rescue with tagged knock-in |
| Can RhoA/YAP pathway be targeted to reduce restenosis? | YAP knockout or overexpression in VSMC and stent models |
How to Study the smooth muscle cell apoptotic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Annexin V/PI flow cytometry | Phosphatidylserine exposure and membrane integrity | Quantifying SMC apoptosis |
| TUNEL assay | DNA fragmentation | Detecting apoptotic SMCs in tissue sections |
| Caspase activity assay | Caspase-3/7 activity | Measuring executioner caspase activation |
| RNA-seq | Global transcriptome changes | Identifying apoptotic gene programs |
| ATAC-seq | Chromatin accessibility | Mapping regulatory elements in SMC apoptosis |
| Phosphoproteomics | Kinase substrate phosphorylation | Dissecting MAPK14 and PERK/ATF4 signaling |
| Live-cell imaging | Internalization and degradation of apoptotic cells | Studying EDIL3-mediated clearance |
| Efferocytosis assay | Macrophage uptake of apoptotic SMCs | Modeling atherosclerosis-associated clearance defects |
Assessing Smooth Muscle Cell Apoptosis
Apoptosis in smooth muscle cells can be assessed by flow cytometry with Annexin V/propidium iodide staining, TUNEL assays, and caspase activity assays. These methods quantify the extent of apoptosis in response to genetic or pharmacological perturbations.
Transcriptomic and Epigenomic Profiling
RNA-seq and ATAC-seq can identify transcriptional changes and chromatin accessibility dynamics during smooth muscle cell apoptosis. For example, ATF3 and MAPK14-dependent transcriptional programs have been dissected using these approaches.
Proteomic and Phosphoproteomic Analysis
Mass spectrometry-based proteomics can reveal changes in apoptotic signaling networks, including phosphorylation of ATF4, MAPK14 substrates, and TFEB targets.
Imaging of Apoptotic Clearance
Live-cell imaging and immunofluorescence can visualize internalization and degradation of apoptotic smooth muscle cells by phagocytes, as shown for EDIL3/Del-1. Macrophage efferocytosis assays are used to study clearance defects.
How CRISPR Can Be Used to Study GO:0034390 smooth muscle cell apoptotic process
Knockout
CRISPR knockout of candidate genes such as ATF3, ATF4, MAPK14, TFEB, YAP, or EDIL3 in smooth muscle cells can determine whether they are required for apoptosis or clearance. For example, VSMC-specific ATF3 knockout mice have been used to study AAA, and MAPK14 knockout can test its role in VSMC degeneration.
Point Mutation
Point mutations can be introduced to dissect specific phosphorylation sites or catalytic residues. For instance, mutation of ATF4 phosphorylation sites can test their importance in ER stress-induced apoptosis, and kinase-dead MAPK14 knock-in can separate kinase-dependent from scaffold functions.
Knock-in
Knock-in of tagged or reporter alleles allows visualization and tracking of proteins such as TFEB or EDIL3 in smooth muscle cells. Tagged TFEB knock-in can monitor autophagy-lysosomal activation in vivo, while EDIL3 knock-in can assess its role in apoptotic cell clearance.
Overexpression
CRISPR activation or transgenic overexpression of protective genes such as TFEB or EDIL3 can test whether increasing their levels prevents smooth muscle cell apoptosis and disease. TFEB overexpression protects against AAA in mice, and EDIL3 overexpression enhances clearance of apoptotic VSMCs.
How EDITGENE Supports smooth muscle cell apoptotic process Research
Researchers studying smooth muscle cell apoptotic process-related genes often need to determine whether a candidate gene is causally involved in apoptosis, clearance, or disease progression. EDITGENE provides CRISPR-based cell model services to enable these functional studies with high precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for smooth muscle cell apoptotic process research.
Frequently Asked Questions About smooth muscle cell apoptotic process
What is GO:0034390?
GO:0034390 is the Gene Ontology term for smooth muscle cell apoptotic process, defined as any apoptotic process in a smooth muscle cell, which are non-striated, elongated, spindle-shaped cells found lining the digestive tract, uterus, and blood vessels.
What genes are involved in smooth muscle cell apoptotic process?
Key genes include ATF3, ATF4, MAPK14, TFEB, YAP, EDIL3, RhoA, PERK, and Bcl-2 family members, as shown in studies of vascular smooth muscle cell apoptosis.
How is smooth muscle cell apoptosis regulated?
It is regulated by ER stress (PERK/ATF4), RhoA/YAP signaling, MAPK14, TFEB-mediated autophagy, and clearance mechanisms involving EDIL3 and macrophage efferocytosis.
What diseases are associated with smooth muscle cell apoptosis?
Abdominal aortic aneurysm, aortic dissection, atherosclerosis, and restenosis are major diseases linked to dysregulated smooth muscle cell apoptosis.
What is the role of ATF3 in smooth muscle cell apoptosis?
ATF3 is a stress-responsive transcription factor whose spatiotemporal expression determines vascular smooth muscle cell fate in abdominal aortic aneurysm.
How does TFEB affect smooth muscle cell apoptosis?
TFEB activation promotes autophagy-lysosomal function and protects against abdominal aortic aneurysm by maintaining vascular smooth muscle cell homeostasis.
What is the role of EDIL3 in apoptotic smooth muscle cell clearance?
EDIL3/Del-1 enhances internalization and degradation of apoptotic vascular smooth muscle cells, and its deficiency predisposes to aortic dissection.
Can CRISPR be used to study smooth muscle cell apoptosis?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can be used to test the causal role of genes such as ATF3, ATF4, MAPK14, TFEB, YAP, and EDIL3 in smooth muscle cell apoptosis.
What methods are used to measure smooth muscle cell apoptosis?
Common methods include Annexin V/PI flow cytometry, TUNEL assays, caspase activity assays, RNA-seq, ATAC-seq, phosphoproteomics, and live-cell imaging.
How does oral pathogen infection affect smooth muscle cell apoptosis?
Oral pathogens can aggravate atherosclerosis by inducing smooth muscle cell apoptosis and repressing macrophage efferocytosis, leading to impaired clearance of apoptotic cells.
Conclusion
GO:0034390, smooth muscle cell apoptotic process, is a fundamental biological process whose dysregulation underlies major vascular diseases including abdominal aortic aneurysm, aortic dissection, atherosclerosis, and restenosis. Research has identified key regulatory nodes such as PERK/ATF4 ER stress signaling, ATF3, MAPK14, TFEB, RhoA/YAP, and EDIL3-mediated clearance. Understanding these mechanisms provides a foundation for therapeutic targeting and for functional genomics studies using CRISPR-based models. EDITGENE offers comprehensive CRISPR services, including knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics, to accelerate research on smooth muscle cell apoptosis and its role in human disease.
References
- 1. Yin Z et al.. 2024. Regulated vascular smooth muscle cell death in vascular diseases.. Cell Prolif 57(11):e13688 PMID: 38873710
- 2. Yin Z et al.. 2024. EDIL3/Del-1 prevents aortic dissection through enhancing internalization and degradation of apoptotic vascular smooth muscle cells.. Autophagy 20(11):2405-2425 PMID: 38873925
- 3. Callow B et al.. 2025. Inhibition of vascular smooth muscle cell PERK/ATF4 ER stress signaling protects against abdominal aortic aneurysms.. JCI Insight 10(2) PMID: 39846252
- 4. Wen Y et al.. 2024. Spatiotemporal ATF3 Expression Determines VSMC Fate in Abdominal Aortic Aneurysm.. Circ Res 134(11):1495-1511 PMID: 38686580
- 5. Xie H et al.. 2023. Oral pathogen aggravates atherosclerosis by inducing smooth muscle cell apoptosis and repressing macrophage efferocytosis.. Int J Oral Sci 15(1):26 PMID: 37380627
- 6. Huang C et al.. 2019. RhoA inhibitor-eluting stent attenuates restenosis by inhibiting YAP signaling.. J Vasc Surg 69(5):1581-1589.e1 PMID: 31010523
- 7. Wu X et al.. 2026. MAPK14 converges on key transcriptional machinery to promote vascular smooth muscle cell degeneration in abdominal aortic aneurysm.. Signal Transduct Target Ther 11(1):17 PMID: 41526342
- 8. Lu H et al.. 2020. Cyclodextrin Prevents Abdominal Aortic Aneurysm via Activation of Vascular Smooth Muscle Cell Transcription Factor EB.. Circulation 142(5):483-498 PMID: 32354235
