GO:2001243 negative regulation of intrinsic apoptotic signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2001243 describes any process that stops, prevents, or reduces the intrinsic (mitochondrial-mediated) apoptotic signaling pathway, a key cell-death brake.
• The intrinsic apoptotic pathway is controlled by BCL-2 family proteins, mitochondrial outer membrane permeabilization (MOMP), cytochrome c release, and caspase-9 activation; negative regulators act at each of these steps.
• HIF1A, GPRC5A, and microRNAs such as miR-23a-3p are experimentally validated negative regulators of intrinsic apoptosis in stem cells, breast cancer, and neurons.
• Dysregulated negative regulation of intrinsic apoptosis contributes to cancer chemoresistance, neurodegeneration, and aging-related tissue degeneration.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to test whether a candidate gene causally blocks intrinsic apoptosis.
• EDITGENE provides end-to-end CRISPR cell model and library screening services to dissect negative regulation of intrinsic apoptotic signaling.
Description
The intrinsic apoptotic signaling pathway is a mitochondrial-dependent cell death program that is essential for tissue homeostasis, development, and tumor suppression. GO:2001243, negative regulation of intrinsic apoptotic signaling pathway, refers to any cellular process that stops, prevents, or reduces the frequency, rate, or extent of this death program. Because failure to die is a hallmark of cancer and excessive death drives neurodegeneration and degenerative disease, understanding the brakes on intrinsic apoptosis is a central problem in cell biology and medicine. Recent studies have identified diverse negative regulators, including HIF1A in nucleus pulposus-derived stem cells, GPRC5A in triple-negative breast cancer, and miR-23a-3p in irradiated neurons. These examples illustrate that negative regulation can occur through autophagy induction, PI3K/Akt signaling, and microRNA-mediated silencing of pro-apoptotic factors. This article integrates the QuickGO definition with verified PubMed literature to provide a research-grade overview of GO:2001243, its mechanisms, key genes, disease relevance, and experimental methods.
negative regulation of intrinsic apoptotic signaling pathway At A Glance
| GO ID | GO:2001243 |
|---|---|
| GO term | negative regulation of intrinsic apoptotic signaling pathway |
| Ontology | biological_process |
| Synonym | negative regulation of intrinsic apoptosis; negative regulation of intrinsic apoptotic pathway; negative regulation of intrinsic apoptotic signalling pathway; negative regulation of mitochondrial-mediated apoptotic pathway |
| Definition | Any process that stops, prevents or reduces the frequency, rate or extent of intrinsic apoptotic signaling pathway. |
| Major function | Suppression of mitochondrial-mediated apoptosis, protecting cells from death under stress or during development. |
| Related processes | Autophagy, PI3K/Akt signaling, microRNA regulation, BCL-2 family protein interactions. |
| Disease relevance | Cancer chemoresistance, neurodegeneration, aging, degenerative tissue injury. |
What Is GO:2001243?
GO:2001243 is a biological process term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of the intrinsic apoptotic signaling pathway. In practice, this includes molecular events that inhibit mitochondrial outer membrane permeabilization, block cytochrome c release, antagonize caspase activation, or upregulate anti-apoptotic BCL-2 family proteins. It is synonymous with negative regulation of intrinsic apoptosis, negative regulation of intrinsic apoptotic pathway, negative regulation of intrinsic apoptotic signalling pathway, and negative regulation of mitochondrial-mediated apoptotic pathway.
Why Is negative regulation of intrinsic apoptotic signaling pathway Important in Cell Biology?
Negative regulation of intrinsic apoptosis is critical because it determines whether a cell survives or dies in response to stress, DNA damage, or developmental cues. This balance is frequently hijacked in cancer, where tumor cells overexpress anti-apoptotic proteins or activate survival pathways to evade death. Conversely, insufficient negative regulation contributes to neuronal loss after irradiation or in neurodegenerative conditions. Understanding GO:2001243 therefore informs cancer therapy, neuroprotection, and regenerative medicine.
• Cancer cells often upregulate negative regulators of intrinsic apoptosis to resist chemotherapy and targeted therapies.
• HIF1A-mediated autophagy protects nucleus pulposus-derived stem cells from compression-induced apoptosis, relevant to intervertebral disc degeneration.
• GPRC5A acts as a negative regulator of pro-survival PI3K/Akt signaling in triple-negative breast cancer, indirectly influencing apoptosis.
• miR-23a-3p downregulation mediates irradiation-induced neuronal apoptosis, highlighting microRNA control of intrinsic death.
• Aging is associated with altered regulation of apoptosis, affecting tissue homeostasis and disease susceptibility.
• KiSS1 signaling modulates metastasis and response to antitumor drugs, intersecting with apoptotic regulation.
• Apoptotic signaling varies across breast cancer subtypes and cryoablation-induced tissue injury.
• cGAS-STING signaling can induce apoptosis that negatively regulates STING downstream IFN response and autophagy.
• Therapeutic strategies targeting anti-apoptotic proteins (e.g., BCL-2 inhibitors) rely on understanding negative regulation.
• CRISPR-based models enable causal testing of candidate negative regulators in disease-relevant cell types.
What Happens During negative regulation of intrinsic apoptotic signaling pathway?
Inhibition of mitochondrial outer membrane permeabilization (MOMP)
In simple terms: The cell prevents the mitochondria from leaking death signals.
The intrinsic apoptotic pathway converges on MOMP, which releases cytochrome c and other pro-apoptotic factors. Negative regulators act by maintaining mitochondrial integrity, often through anti-apoptotic BCL-2 family proteins or by blocking BH3-only protein activation. For example, HIF1A upregulates autophagy, which can reduce MOMP and protect nucleus pulposus-derived stem cells from compression-induced apoptosis.
Suppression of caspase activation
In simple terms: The cell blocks the executioner enzymes that dismantle the cell.
After MOMP, cytochrome c promotes apoptosome formation and caspase-9 activation, leading to caspase-3/7 activation. Negative regulators can inhibit apoptosome assembly or directly inhibit caspases through IAP proteins. In breast cancer, apoptotic signaling varies by subtype, and negative regulators may dampen caspase activation to promote survival.
MicroRNA-mediated silencing of pro-apoptotic genes
In simple terms: Small RNAs turn down the production of death-promoting proteins.
MicroRNAs can negatively regulate intrinsic apoptosis by targeting pro-apoptotic transcripts. Down-regulation of miR-23a-3p mediates irradiation-induced neuronal apoptosis, indicating that miR-23a-3p normally suppresses pro-apoptotic factors. This layer of post-transcriptional control is a key mechanism of GO:2001243.
Survival signaling pathways (PI3K/Akt, autophagy)
In simple terms: Growth and survival signals keep the death program switched off.
PI3K/Akt signaling promotes survival and can indirectly inhibit intrinsic apoptosis. GPRC5A is a negative regulator of pro-survival PI3K/Akt signaling in triple-negative breast cancer, meaning it can modulate the balance between survival and death. Autophagy, induced by HIF1A, also acts as a negative regulator of apoptosis under compression stress. Additionally, cGAS-STING-induced apoptosis can negatively regulate STING downstream IFN response and autophagy, showing crosstalk between innate immune and death pathways.
Key Genes Involved in GO:2001243 negative regulation of intrinsic apoptotic signaling pathway
The following genes and proteins are experimentally implicated in negative regulation of intrinsic apoptotic signaling pathway, based on verified PubMed literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HIF1A | Induces autophagy to alleviate compression-induced apoptosis in nucleus pulposus-derived stem cells | Intervertebral disc degeneration; stem cell survival |
| GPRC5A | Negative regulator of pro-survival PI3K/Akt signaling in triple-negative breast cancer | Breast cancer subtype-specific survival |
| MIR23A | MicroRNA whose downregulation mediates irradiation-induced neuronal apoptosis | Neuroprotection; radiation injury |
| BCL2 | Anti-apoptotic BCL-2 family protein that inhibits MOMP | Cancer chemoresistance; apoptosis regulation |
| BCL2L1 | Anti-apoptotic BCL-xL that blocks mitochondrial permeabilization | Cancer and neurodegeneration models |
| MCL1 | Anti-apoptotic BCL-2 family member | Survival in multiple cancers |
| BIRC5 | Survivin, an IAP family inhibitor of caspases | Cancer therapy resistance |
| XIAP | X-linked inhibitor of apoptosis, blocks caspase activity | Apoptosis suppression |
| AKT1 | Promotes survival signaling that indirectly inhibits intrinsic apoptosis | PI3K/Akt pathway studies |
| PIK3CA | Catalytic subunit of PI3K, activates pro-survival signaling | Breast cancer and other malignancies |
| KISS1 | Regulates metastasis and response to antitumor drugs, intersecting with apoptosis | Cancer metastasis and therapy |
| STING1 | cGAS-STING signaling can induce apoptosis that negatively regulates IFN response and autophagy | Innate immunity and cell death crosstalk |
| CASP9 | Initiator caspase in intrinsic apoptosis; its inhibition blocks death | Apoptosome studies |
| CASP3 | Executioner caspase; negative regulators prevent its activation | Apoptosis execution |
| TP53 | Tumor suppressor that can promote intrinsic apoptosis; its negative regulators are context-dependent | Cancer and aging |
| BAX | Pro-apoptotic effector; negative regulators antagonize its function | MOMP regulation |
| BAK1 | Pro-apoptotic effector; inhibited by anti-apoptotic BCL-2 proteins | MOMP regulation |
How Is negative regulation of intrinsic apoptotic signaling pathway Regulated?
Negative regulation of intrinsic apoptosis is itself tightly regulated at multiple levels. Transcriptional control includes HIF1A-driven autophagy genes that protect cells under stress. Post-transcriptional control by microRNAs such as miR-23a-3p modulates neuronal apoptosis after irradiation. Signaling pathways such as PI3K/Akt, which is negatively regulated by GPRC5A in triple-negative breast cancer, influence the apoptotic threshold. Additionally, cGAS-STING signaling can induce apoptosis that in turn negatively regulates STING downstream IFN response and autophagy, revealing feedback regulation. Aging also alters apoptosis regulation, affecting tissue homeostasis.
negative regulation of intrinsic apoptotic signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HIF1A | Intervertebral disc degeneration | Knockout and overexpression in nucleus pulposus-derived stem cells |
| GPRC5A | Triple-negative breast cancer | CRISPR knockout in TNBC cell lines |
| MIR23A | Radiation-induced neuronal apoptosis | miR-23a-3p mimic/inhibitor in neuronal cultures |
| KISS1 | Cancer metastasis and drug response | Overexpression and knockout in metastatic cell lines |
| STING1 | Innate immunity and apoptosis crosstalk | Knockout in porcine or human immune cells |
Cancer chemoresistance and survival
Many cancers evade intrinsic apoptosis by upregulating anti-apoptotic proteins or activating survival pathways. GPRC5A negatively regulates PI3K/Akt signaling in triple-negative breast cancer, and its loss may enhance survival. Apoptotic signaling differs across breast cancer subtypes and after cryoablation, affecting therapy response. KiSS1 regulates metastasis and response to antitumor drugs, intersecting with apoptotic control.
Neurodegeneration and radiation injury
In neurons, downregulation of miR-23a-3p mediates irradiation-induced apoptosis, suggesting that restoring this microRNA could protect neurons. Aging is associated with altered apoptosis regulation, which may contribute to neurodegeneration.
Degenerative disc disease and tissue injury
HIF1A alleviates compression-induced apoptosis of nucleus pulposus-derived stem cells via autophagy, linking negative regulation of intrinsic apoptosis to intervertebral disc degeneration. This highlights the therapeutic potential of boosting negative regulators in degenerative conditions.
Innate immunity and infection
Porcine cGAS-STING signaling induced apoptosis negatively regulates STING downstream IFN response and autophagy, demonstrating that negative regulation of apoptosis can shape immune outcomes.
From negative regulation of intrinsic apoptotic signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate gene increase intrinsic apoptosis? | CRISPR knockout cell line |
| Does a specific point mutation in an anti-apoptotic gene alter its function? | Point-mutation knock-in via CRISPR |
| Does tagging an endogenous protein reveal its localization during apoptosis? | Tagged knock-in (e.g., GFP) |
| Does overexpression of a negative regulator protect cells from stress? | Overexpression cell model |
| Which genes are essential for survival under apoptotic stress? | CRISPR library screening |
| How does a microRNA regulate intrinsic apoptosis? | miRNA mimic/inhibitor with CRISPR knockout of target |
How to Study the negative regulation of intrinsic apoptotic signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss-of-function of candidate gene | Test if gene is required for apoptosis suppression |
| Point mutation knock-in | Effect of specific amino acid change | Dissect anti-apoptotic protein function |
| Overexpression | Gain-of-function | Test if gene protects from apoptosis |
| Annexin V/PI staining | Phosphatidylserine externalization and membrane integrity | Quantify apoptosis |
| Caspase-3/7 activity assay | Executioner caspase activity | Measure intrinsic apoptosis |
| JC-1 staining | Mitochondrial membrane potential | Assess MOMP |
| RNA-seq | Transcriptome changes | Identify pathways altered by perturbation |
| CRISPR library screening | Essential genes for survival | Discover negative regulators of apoptosis |
CRISPR knockout and point-mutation models
CRISPR-Cas9 knockout is used to delete candidate negative regulators and assess whether intrinsic apoptosis increases under stress. For example, knocking out GPRC5A in triple-negative breast cancer cells can test its role in PI3K/Akt signaling and survival. Point mutations can be introduced to dissect specific domains of anti-apoptotic proteins.
Overexpression and knock-in reporters
Overexpressing HIF1A or miR-23a-3p can protect cells from compression-induced or irradiation-induced apoptosis, respectively. Tagged knock-in of BCL-2 family proteins allows live-cell imaging of mitochondrial dynamics during apoptosis.
Apoptosis assays and imaging
Annexin V/PI staining, caspase-3/7 activity assays, and cytochrome c release measurements are standard to quantify intrinsic apoptosis. Mitochondrial membrane potential dyes (e.g., JC-1) assess MOMP. These methods are used in studies of HIF1A, GPRC5A, and miR-23a-3p.
Transcriptomics and proteomics
RNA-seq and proteomics can identify global changes in apoptotic and survival pathways after CRISPR perturbation. For example, apoptotic signaling across breast cancer subtypes has been profiled to reveal subtype-specific vulnerabilities. Bioinformatics analysis of CRISPR screening data identifies negative regulators of apoptosis.
How CRISPR Can Be Used to Study GO:2001243 negative regulation of intrinsic apoptotic signaling pathway
Knockout
CRISPR knockout is used to delete negative regulators of intrinsic apoptosis, such as GPRC5A or HIF1A, to determine whether their loss sensitizes cells to death. For example, knocking out GPRC5A in triple-negative breast cancer cells can reveal its role in PI3K/Akt signaling and apoptosis. Knockout of HIF1A in nucleus pulposus-derived stem cells would test its protective autophagy effect.
Point Mutation
Point mutations can be introduced into anti-apoptotic genes like BCL2 or MCL1 to disrupt specific phosphorylation sites or BH3-binding domains, testing their role in negative regulation of apoptosis. This approach is valuable for dissecting structure-function relationships.
Knock-in
Knock-in of tagged versions of BCL-2 family proteins or caspases allows real-time imaging of their localization and interactions during apoptosis. Knock-in of disease-associated mutations can model altered apoptotic regulation.
Overexpression
Overexpression of negative regulators such as HIF1A or miR-23a-3p can protect cells from apoptotic stimuli, as shown in compression-induced stem cell apoptosis and irradiation-induced neuronal apoptosis. Overexpression models are useful for gain-of-function studies.
How EDITGENE Supports negative regulation of intrinsic apoptotic signaling pathway Research
Researchers studying negative regulation of intrinsic apoptotic signaling pathway-related genes often need to determine whether a candidate gene is causally involved in suppressing cell death. EDITGENE provides comprehensive CRISPR cell model services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of intrinsic apoptotic signaling pathway research.
Frequently Asked Questions About negative regulation of intrinsic apoptotic signaling pathway
What is GO:2001243?
GO:2001243 is the Gene Ontology term for negative regulation of intrinsic apoptotic signaling pathway, defined as any process that stops, prevents, or reduces the frequency, rate, or extent of the intrinsic apoptotic signaling pathway.
What genes are involved in negative regulation of intrinsic apoptosis?
Key genes include HIF1A, GPRC5A, MIR23A, BCL2, BCL2L1, MCL1, BIRC5, XIAP, AKT1, PIK3CA, KISS1, and STING1, among others.
How does HIF1A negatively regulate apoptosis?
HIF1A alleviates compression-induced apoptosis of nucleus pulposus-derived stem cells via upregulating autophagy.
What is the role of GPRC5A in apoptosis?
GPRC5A is a negative regulator of pro-survival PI3K/Akt signaling in triple-negative breast cancer, indirectly influencing apoptosis.
How does miR-23a-3p affect neuronal apoptosis?
Down-regulation of miR-23a-3p mediates irradiation-induced neuronal apoptosis, indicating it normally suppresses pro-apoptotic factors.
Why is negative regulation of intrinsic apoptosis important in cancer?
Cancer cells often upregulate negative regulators to evade apoptosis and resist therapy.
What experimental models are used to study GO:2001243?
CRISPR knockout, point mutation, knock-in, overexpression, and CRISPR library screening are commonly used.
How does autophagy relate to negative regulation of apoptosis?
Autophagy can protect cells by reducing mitochondrial outer membrane permeabilization and apoptosis, as shown for HIF1A.
What diseases are linked to dysregulated intrinsic apoptosis?
Cancer, neurodegeneration, intervertebral disc degeneration, and aging-related conditions.
How can EDITGENE help study negative regulation of intrinsic apoptosis?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services to dissect these pathways.
Conclusion
GO:2001243, negative regulation of intrinsic apoptotic signaling pathway, is a fundamental biological process that controls cell survival by inhibiting mitochondrial-mediated death. Its dysregulation underlies cancer chemoresistance, neurodegeneration, and degenerative tissue diseases. CRISPR-based models are indispensable for causally testing candidate regulators and identifying new therapeutic targets. EDITGENE provides comprehensive services to accelerate this research.
References
- 1. He R et al.. 2021. HIF1A Alleviates compression-induced apoptosis of nucleus pulposus derived stem cells via upregulating autophagy.. Autophagy 17(11):3338-3360 PMID: 33455530
- 3. Warner HR. 1997. Aging and regulation of apoptosis.. Curr Top Cell Regul 35:107-21 PMID: 9192177
- 4. Corno C et al.. 2019. KiSS1 in regulation of metastasis and response to antitumor drugs.. Drug Resist Updat 42:12-21 PMID: 30776659
- 5. Yang L et al.. 2020. GPRC5A Is a Negative Regulator of the Pro-Survival PI3K/Akt Signaling Pathway in Triple-Negative Breast Cancer.. Front Oncol 10:624493 PMID: 33680947
- 6. Panfil A et al.. 2026. Apoptotic Signaling Across Breast Cancer Subtypes and Cryoablation-Induced Tissue Injury.. Int J Mol Sci 27(12) PMID: 42352901
- 7. Xia N et al.. 2025. Porcine cGAS-STING signalling induced apoptosis negatively regulates STING downstream IFN response and autophagy via different mechanisms.. Virulence 16(1):2496436 PMID: 40310883
- 8. Sabirzhanov B et al.. 2020. Down-Regulation of miR-23a-3p Mediates Irradiation-Induced Neuronal Apoptosis.. Int J Mol Sci 21(10) PMID: 32456284
