GO:1902235 regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway: Apoptosis Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902235 describes any process that modulates the frequency, rate or extent of an endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway.
• The term sits at the intersection of the unfolded protein response (UPR) and mitochondrial apoptosis, where ER stress sensors such as PERK, ATF6 and IRE1α determine cell fate [1,5].
• Key regulators include the BCL-2 family proteins BIM, BAX and BAK, the chaperone HSPB1, and p53, which can either promote or restrain ER stress-driven apoptosis [5,8].
• Dysregulation of this process is implicated in cancer, neurodegeneration, metabolic disease and hypoxic-ischemic injury, making it a therapeutic target [1,4,6].
• MicroRNAs, interferons and metabolic drugs such as metformin can modulate ER stress-induced apoptosis, providing entry points for experimental intervention [2,4,7].
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to establish causality for candidate regulators within this pathway [5,8].
Description
The endoplasmic reticulum (ER) is the primary site for protein folding and secretion, and its homeostasis is monitored by the unfolded protein response (UPR). When ER stress is severe or prolonged, the UPR can switch from a pro-survival to a pro-apoptotic program, activating the intrinsic mitochondrial apoptotic pathway. GO:1902235, regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway, captures any process that modulates the frequency, rate or extent of this ER stress-induced intrinsic apoptotic signaling pathway. This term is therefore central to understanding how cells decide between adaptation and death under proteotoxic stress. Researchers study GO:1902235 because its effectors are frequently altered in cancer, neurodegeneration and ischemia-reperfusion injury, and because the pathway offers multiple druggable nodes [1,4,6]. The pathway integrates ER-resident sensors, BCL-2 family proteins, chaperones and microRNAs, and its output can be measured by mitochondrial outer membrane permeabilization, caspase activation and apoptotic body formation [3,5,7]. Because the term is a regulation term, it encompasses both positive and negative modulators, including chaperones that attenuate apoptosis and tumor suppressors that sensitize cells to ER stress [5,8].
regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway At A Glance
| GO ID | GO:1902235 |
|---|---|
| GO term | regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway |
| Ontology | biological_process |
| Synonym | regulation of apoptosis in response to endoplasmic reticulum stress; regulation of ER stress-induced apoptosis; regulation of intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress |
| Major function | Modulates the frequency, rate or extent of ER stress-induced intrinsic apoptotic signaling |
| Related processes | Unfolded protein response, intrinsic apoptotic signaling pathway, mitochondrial outer membrane permeabilization |
| Key sensors | PERK, ATF6, IRE1α (ERN1) |
| Key effectors | BIM, BAX, BAK, caspase-9, caspase-3 |
| Key regulators | HSPB1, p53, microRNAs, interferon α, metformin-sensitive translation |
What Is GO:1902235?
GO:1902235 is a biological process term defined as any process that modulates the frequency, rate or extent of an endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway. In other words, it covers the regulatory inputs that tune how strongly, how quickly or how often ER stress triggers intrinsic (mitochondrial) apoptosis. It does not describe the apoptotic execution machinery itself, but rather the modulators that act upstream or in parallel to influence that machinery.
Why Is regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Important in Cell Biology?
GO:1902235 matters because the balance between ER stress adaptation and apoptosis determines cell fate in many diseases. In cancer, tumor cells often hijack ER stress regulators to survive proteotoxic conditions, whereas in neurodegeneration and ischemia, excessive ER stress-induced apoptosis drives cell loss [1,4,6]. Understanding the regulators within this term can reveal biomarkers and therapeutic targets, and it provides a mechanistic framework for interpreting how drugs, microRNAs or metabolic signals shift the threshold for apoptosis [2,4,7].
• Defines the regulatory layer that decides whether ER stress kills a cell or is tolerated.
• Connects the UPR to mitochondrial apoptosis through BCL-2 family proteins such as BIM and BAX.
• Is relevant to cancer biology, where apoptosis evasion is a hallmark and ER stress regulators are often dysregulated.
• Is relevant to neurodegeneration and hypoxic-ischemic injury, where ER stress-induced apoptosis contributes to cell loss.
• Provides mechanistic context for microRNA-mediated control of cell death pathways.
• Explains how interferons and other cytokines can sensitize cancer cells to ER stress-induced apoptosis.
• Highlights metabolic modulation of apoptosis, for example by metformin suppressing β-cell apoptosis under ER stress.
• Offers targets such as HSPB1 and p53 that can be manipulated to attenuate or enhance ER stress-induced apoptosis [5,8].
• Supports development of CRISPR models to test causality of candidate regulators [5,8].
• Guides combination strategies in which ER stress inducers are paired with apoptosis modulators.
What Happens During regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway?
ER stress sensing and UPR activation
In simple terms: The cell first notices that the ER is overwhelmed and turns on a stress response.
ER stress activates three principal sensors, PERK, ATF6 and IRE1α, which initiate the unfolded protein response. This response initially promotes survival by reducing translation and increasing chaperone expression, but persistent stress can shift the balance toward apoptosis. The regulation term GO:1902235 encompasses the inputs that determine this shift. Chaperones such as HSPB1 can influence the intensity of this response and thereby modulate downstream apoptosis.
Cross-talk with intrinsic apoptotic signaling
In simple terms: The stress signal is passed to the mitochondria, which decide whether to release death factors.
When ER stress is unresolved, BH3-only proteins such as BIM are induced or activated, leading to BAX/BAK-dependent mitochondrial outer membrane permeabilization and caspase activation. Regulators within GO:1902235 modulate the efficiency of this cross-talk. For example, HSPB1 facilitates ERK-mediated phosphorylation and degradation of BIM, thereby attenuating ER stress-induced apoptosis. Conversely, p53 can sensitize cells to ER stress-induced apoptosis, and its down-regulation by prostaglandin EP2 receptor signaling protects trabecular meshwork cells.
Modulation by microRNAs and cytokines
In simple terms: Small RNAs and immune signals can dial the apoptosis response up or down.
MicroRNAs are key regulators of cell death pathways, including apoptosis and necroptosis, and can target multiple nodes in ER stress-induced intrinsic apoptosis. Interferon α induces apoptosis in cervical cancer HeLa cells by activating both the intrinsic mitochondrial pathway and the ER stress-induced pathway, illustrating cytokine-mediated regulation. These examples show that GO:1902235 includes diverse upstream modulators that converge on the ER-mitochondria axis.
Metabolic and pharmacological regulation
In simple terms: Drugs and metabolic signals can change how easily ER stress triggers apoptosis.
Metformin suppresses β-cell apoptosis under ER stress by inhibiting protein translation, demonstrating that metabolic regulators can modulate this pathway. Verotoxin-1-induced ER stress can trigger either apoptotic or survival pathways in Burkitt lymphoma cells, depending on context, highlighting the importance of cell-type-specific regulation. Such findings support the view that GO:1902235 is a dynamic integration point for metabolic and pharmacological inputs.
Tissue-specific regulation in development and disease
In simple terms: Different tissues use different guards and killers to control ER stress-induced apoptosis.
During spermatogenesis, regulators of the apoptotic pathway act as killers or guards, and ER stress-induced apoptosis is one of the mechanisms that can be engaged. In hypoxic-ischemic encephalopathy, molecular chaperones modulate ER stress and apoptosis in neurons. These examples illustrate that the regulation described by GO:1902235 is context-dependent and tissue-specific.
Key Genes Involved in GO:1902235 regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
The following genes and proteins are established or emerging regulators within GO:1902235, based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSPB1 | Facilitates ERK-mediated phosphorylation and degradation of BIM to attenuate ER stress-induced apoptosis | Chaperone-mediated protection; target for enhancing survival under ER stress |
| BIM (BCL2L11) | BH3-only protein that promotes mitochondrial apoptosis downstream of ER stress | Key effector whose stability is regulated by HSPB1 and ERK |
| BAX | Pro-apoptotic BCL-2 family effector mediating mitochondrial outer membrane permeabilization | Executioner of intrinsic apoptosis; common KO target |
| BAK | Pro-apoptotic BCL-2 family effector cooperating with BAX | Executioner of intrinsic apoptosis; common KO target |
| TP53 | Tumor suppressor that can sensitize cells to ER stress-induced apoptosis; down-regulated by EP2 signaling | Regulator of apoptosis threshold; frequently mutated in cancer |
| PERK (EIF2AK3) | ER stress sensor that phosphorylates eIF2α to attenuate translation | UPR sensor; KO models reveal survival vs apoptosis balance |
| ATF6 | ER stress sensor and transcription factor activating chaperone genes | UPR sensor; overexpression and KO models |
| IRE1α (ERN1) | ER stress sensor with endoribonuclease activity linked to apoptosis regulation | UPR sensor; point-mutation studies of RNase activity |
| CASP9 | Initiator caspase of the intrinsic apoptotic pathway | Apoptosis execution; KO and activity assays |
| CASP3 | Executioner caspase downstream of mitochondrial apoptosis | Apoptosis readout; KO and inhibitor studies |
| MIRNAs (e.g., miR-21, miR-29) | MicroRNAs that modulate apoptosis and necroptosis pathways | Post-transcriptional regulators; mimic/inhibitor studies |
| IFNα pathway genes | Interferon α induces intrinsic and ER stress-induced apoptosis in HeLa cells | Cytokine-mediated regulation; overexpression models |
| EP2 receptor (PTGER2) | Prostaglandin EP2 receptor signaling protects trabecular meshwork cells by down-regulating p53 | G-protein coupled receptor regulation of apoptosis |
| Metformin targets (e.g., mitochondrial complex I) | Metformin suppresses β-cell apoptosis under ER stress by inhibiting translation | Metabolic regulation; pharmacological models |
| Verotoxin-1 targets (e.g., Gb3 synthase) | Verotoxin-1-induced ER stress triggers apoptotic or survival pathways in Burkitt lymphoma | Toxin-induced ER stress; context-dependent outcomes |
| Chaperones (e.g., HSPA5/BiP) | Molecular chaperones modulate ER stress and apoptosis in hypoxic-ischemic encephalopathy | Chaperone network; overexpression and KO models |
| Apoptosis regulators in spermatogenesis | Killers or guards that control apoptotic pathway during spermatogenesis | Tissue-specific regulation; KO mouse models |
How Is regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Regulated?
GO:1902235 is regulated at multiple levels. Upstream, ER stress sensors PERK, ATF6 and IRE1α initiate the UPR and set the threshold for apoptosis. Chaperones such as HSPB1 can attenuate apoptosis by promoting BIM degradation, while p53 can sensitize cells and is itself down-regulated by EP2 receptor signaling. MicroRNAs provide post-transcriptional regulation of multiple nodes in the pathway. Metabolic inputs, such as metformin-mediated inhibition of protein translation, can suppress ER stress-induced apoptosis. Cytokines like interferon α can activate both intrinsic and ER stress-induced apoptosis. Finally, context-dependent factors, such as verotoxin-1 in Burkitt lymphoma, can shift the outcome between apoptosis and survival.
regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSPB1 | Neuroprotection and ER stress attenuation | Overexpression and KO in neuronal cell lines |
| TP53 | Glaucoma-related trabecular meshwork protection | Point mutation and KO in trabecular meshwork cells |
| IFNα pathway | Cervical cancer apoptosis | Overexpression and KO in HeLa cells |
| Metformin targets | β-cell apoptosis in diabetes | KO and pharmacological models in β-cells |
| Verotoxin-1 targets | Burkitt lymphoma | Knockout of Gb3 synthase in lymphoma cells |
Cancer
Tumor cells often depend on ER stress regulators to survive proteotoxic stress, and microRNAs can modulate apoptosis and necroptosis in cancer. Interferon α induces apoptosis in cervical cancer HeLa cells through both intrinsic and ER stress-induced pathways, suggesting therapeutic potential. Verotoxin-1-induced ER stress can trigger apoptosis or survival in Burkitt lymphoma cells, highlighting context-dependent outcomes.
Neurodegeneration and hypoxic-ischemic injury
Molecular chaperones modulate ER stress and apoptosis in hypoxic-ischemic encephalopathy, where neuronal loss is a major consequence. Regulators within GO:1902235 are therefore candidate targets for neuroprotection.
Metabolic and endocrine disease
Metformin suppresses β-cell apoptosis under ER stress by inhibiting protein translation, linking metabolic regulation to this pathway. This suggests that GO:1902235 regulators may influence diabetes-related β-cell survival.
Ocular and reproductive biology
Prostaglandin EP2 receptor signaling protects human trabecular meshwork cells from ER stress-induced apoptosis by down-regulating p53, relevant to glaucoma research. In spermatogenesis, apoptotic regulators act as killers or guards, and ER stress-induced apoptosis is one mechanism involved.
From regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HSPB1 enhance ER stress-induced apoptosis? | HSPB1 knockout cell line |
| Does a point mutation in BAX prevent mitochondrial apoptosis? | BAX point-mutation knock-in |
| Does p53 down-regulation protect trabecular meshwork cells? | TP53 knockout or knockdown |
| Does overexpression of a microRNA modulate ER stress-induced apoptosis? | microRNA mimic overexpression |
| Does a tagged BIM allele report degradation dynamics? | Tagged knock-in of BIM |
| Does metformin require translation inhibition to suppress apoptosis? | Metformin-treated β-cell knockout models |
How to Study the regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptional changes | Identify ER stress-induced gene expression programs |
| Proteomics | Protein abundance and modifications | Detect BIM phosphorylation and degradation |
| Flow cytometry | Apoptotic cell fraction | Quantify ER stress-induced apoptosis |
| Caspase activity assay | Caspase-3/9 activity | Confirm intrinsic apoptosis execution |
| Mitochondrial membrane potential assay | MOMP | Measure mitochondrial apoptosis |
| Immunofluorescence | Protein localization | Track BIM, BAX, cytochrome c [5,8] |
| CRISPR knockout | Gene function loss | Test causality of regulators [5,8] |
| CRISPR knock-in | Tagged or mutant alleles | Study protein dynamics and point mutations |
Transcriptomic and proteomic profiling
RNA-seq and proteomics can identify genes and proteins whose expression changes during ER stress-induced apoptosis. These approaches help map the regulatory network within GO:1902235, including microRNA targets and chaperone networks [1,4].
Apoptosis assays
Flow cytometry with Annexin V/PI, caspase activity assays and mitochondrial membrane potential measurements quantify apoptosis. These readouts are used to test whether a candidate regulator modulates ER stress-induced intrinsic apoptosis [3,5,7].
Imaging and subcellular localization
Fluorescence microscopy and live-cell imaging can track ER-mitochondria contact sites, BIM translocation and cytochrome c release. These methods reveal the spatial dynamics of the pathway [5,8].
CRISPR-based perturbation
CRISPR knockout, point mutation, knock-in and overexpression models enable causal testing of candidate regulators. For example, knocking out HSPB1 or mutating BAX can reveal their roles in ER stress-induced apoptosis [5,8].
How CRISPR Can Be Used to Study GO:1902235 regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
Knockout
CRISPR knockout of candidate regulators such as HSPB1, BAX or BAK can determine whether they are required for ER stress-induced apoptosis. For example, HSPB1 knockout would be expected to enhance BIM accumulation and apoptosis under ER stress.
Point Mutation
Point mutations can dissect specific phosphorylation or interaction sites. For instance, mutating the ERK phosphorylation sites on BIM would test whether HSPB1-mediated degradation depends on this modification.
Knock-in
Knock-in of tagged alleles, such as GFP-BIM, allows real-time tracking of protein localization and turnover during ER stress. This approach can reveal dynamic regulation within GO:1902235.
Overexpression
Overexpression of protective regulators like HSPB1 or dominant-negative p53 can test whether they are sufficient to block ER stress-induced apoptosis [5,8].
How EDITGENE Supports regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Research
Researchers studying regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway-related genes often need to determine whether a candidate gene is causally involved in modulating apoptosis. Establishing causality requires precise genetic models that can knockout, mutate, tag or overexpress the gene of interest in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway research.
Frequently Asked Questions About regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
What is GO:1902235?
GO:1902235 is a Gene Ontology biological process term defined as any process that modulates the frequency, rate or extent of an endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway.
What genes are involved in regulation of ER stress-induced intrinsic apoptotic signaling?
Key genes include HSPB1, BIM (BCL2L11), BAX, BAK, TP53, PERK (EIF2AK3), ATF6, IRE1α (ERN1), CASP9 and CASP3, as well as microRNAs and cytokine pathway components [1,3,4,5,7,8].
How does ER stress lead to intrinsic apoptosis?
Severe or prolonged ER stress activates BH3-only proteins such as BIM, which trigger BAX/BAK-dependent mitochondrial outer membrane permeabilization and caspase activation [3,5].
What is the role of HSPB1 in ER stress-induced apoptosis?
HSPB1 facilitates ERK-mediated phosphorylation and degradation of BIM, thereby attenuating ER stress-induced apoptosis.
Can microRNAs regulate ER stress-induced apoptosis?
Yes, microRNAs are key regulators of apoptosis and necroptosis and can target multiple nodes in the ER stress-induced intrinsic apoptotic pathway.
How is p53 involved in ER stress-induced apoptosis?
p53 can sensitize cells to ER stress-induced apoptosis, and its down-regulation by prostaglandin EP2 receptor signaling protects trabecular meshwork cells.
Does metformin affect ER stress-induced apoptosis?
Metformin suppresses β-cell apoptosis under ER stress by inhibiting protein translation.
What diseases are associated with dysregulated ER stress-induced apoptosis?
Cancer, neurodegeneration, hypoxic-ischemic encephalopathy, metabolic disease and ocular disorders such as glaucoma have been linked to this pathway [1,2,4,6,8].
How can CRISPR be used to study GO:1902235?
CRISPR knockout, point mutation, knock-in and overexpression models allow causal testing of candidate regulators in ER stress-induced apoptosis [5,8].
What methods measure ER stress-induced intrinsic apoptosis?
Flow cytometry, caspase activity assays, mitochondrial membrane potential assays and imaging of BIM/BAX localization are commonly used [3,5,7].
Conclusion
GO:1902235 provides a formal framework for studying how cells regulate the decision to undergo intrinsic apoptosis in response to ER stress. The pathway integrates ER sensors, BCL-2 family proteins, chaperones, microRNAs and metabolic signals, and its dysregulation contributes to cancer, neurodegeneration and metabolic disease. CRISPR-based models are powerful tools to establish causality and to identify new therapeutic targets within this regulatory network.
References
- 1. Hua C et al.. 2017. Molecular chaperones and hypoxic-ischemic encephalopathy.. Neural Regen Res 12(1):153-160 PMID: 28250763
- 2. Inoue R et al.. 2026. Metformin suppresses β-cell apoptosis under ER stress by inhibiting protein translation.. Metabolism 180:156607 PMID: 41962652
- 3. Xu YR et al.. 2016. Regulators in the apoptotic pathway during spermatogenesis: Killers or guards?. Gene 582(2):97-111 PMID: 26861610
- 4. Shirjang S et al.. 2019. MicroRNAs in cancer cell death pathways: Apoptosis and necroptosis.. Free Radic Biol Med 139:1-15 PMID: 31102709
- 5. Kennedy D et al.. 2017. HSPB1 facilitates ERK-mediated phosphorylation and degradation of BIM to attenuate endoplasmic reticulum stress-induced apoptosis.. Cell Death Dis 8(8):e3026 PMID: 29048431
- 6. Debernardi J et al.. 2020. Verotoxin-1-Induced ER Stress Triggers Apoptotic or Survival Pathways in Burkitt Lymphoma Cells.. Toxins (Basel) 12(5) PMID: 32403276
- 7. Shi WY et al.. 2016. Interferon α Induces the Apoptosis of Cervical Cancer HeLa Cells by Activating both the Intrinsic Mitochondrial Pathway and Endoplasmic Reticulum Stress-Induced Pathway.. Int J Mol Sci 17(11) PMID: 27827850
- 8. Kalouche G et al.. 2016. Prostaglandin EP2 receptor signaling protects human trabecular meshwork cells from apoptosis induced by ER stress through down-regulation of p53.. Biochim Biophys Acta 1863(9):2322-32 PMID: 27321910
