GO:1903381 regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway: Neurodegeneration Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1903381 describes any process that modulates the frequency, rate or extent of neuron intrinsic apoptosis triggered by endoplasmic reticulum (ER) stress.
• ER stress activates the unfolded protein response (UPR), and when adaptive signaling fails, intrinsic apoptotic signaling is initiated in neurons.
• ASK1 (MAP3K5) is a key redox-sensitive kinase that couples ER stress to apoptotic signaling, and its modulation is cytoprotective in cellular models.
• In vivo, ER stress-induced apoptosis in the penumbra aggravates secondary damage after traumatic brain injury in rats.
• Molecular chaperones that buffer ER stress are candidate regulators of this pathway in hypoxic-ischemic encephalopathy.
• CRISPR knockout, point-mutation, knock-in and overexpression models enable causal testing of candidate regulators of GO:1903381.
Description
GO:1903381, regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway, is a biological process Gene Ontology term that captures any process modulating the frequency, rate or extent of neuron intrinsic apoptosis initiated by endoplasmic reticulum (ER) stress. The ER is the principal organelle for protein folding and calcium storage, and when its folding capacity is exceeded, the unfolded protein response (UPR) is engaged; if the UPR fails to restore homeostasis, intrinsic apoptotic signaling can be activated in neurons. Because neurons are post-mitotic and highly sensitive to proteostatic imbalance, the regulation of this pathway is central to neuronal survival decisions. Mechanistically, ER stress-induced apoptosis in neurons is controlled by a network of kinases, chaperones and BCL-2 family proteins. The redox-sensitive kinase ASK1 (MAP3K5) is a well-documented mediator that links ER stress to downstream apoptotic signaling, and chemical biology studies have identified small molecules that modulate ASK1 and confer cytoprotection. In vivo evidence shows that ER stress-induced apoptosis in the penumbra aggravates secondary damage in rats with traumatic brain injury, indicating that this pathway is not merely a cell-culture phenomenon but a driver of tissue loss after acute brain injury. For researchers, GO:1903381 provides a precise annotation target for experiments that ask whether a gene, drug or stressor changes the rate of ER stress-induced neuronal apoptosis. It is distinct from generic apoptosis terms because it specifies both the upstream trigger (ER stress) and the cell type (neuron) and the apoptotic mode (intrinsic). This specificity makes it valuable for functional genomics, drug discovery and CRISPR-based causal inference in neurobiology [1,2,3].
regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway At A Glance
| GO ID | GO:1903381 |
|---|---|
| GO term | regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway |
| Ontology | biological_process |
| Synonym | regulation of ER stress-induced neuron apoptosis; regulation of ER stress-induced neuron intrinsic apoptotic signaling pathway; regulation of neuron intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress |
| Major function | Modulates the frequency, rate or extent of neuron intrinsic apoptosis triggered by ER stress |
| Upstream trigger | Endoplasmic reticulum stress and unfolded protein response signaling |
| Key mediator | ASK1 (MAP3K5) redox-sensitive kinase signaling |
| Disease relevance | Hypoxic-ischemic encephalopathy and traumatic brain injury [1,2] |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, chemical biology, in vivo injury models [2,3] |
What Is GO:1903381?
In plain terms, GO:1903381 is the set of processes that turn up or turn down the death of neurons by an intrinsic apoptotic program that was started by ER stress. The QuickGO definition states: Any process that modulates the frequency, rate or extent of an endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway. It is a biological_process term with synonyms including regulation of endoplasmic reticulum stress-induced neuron apoptosis and regulation of ER stress-induced neuron intrinsic apoptotic signaling pathway. It does not itself execute apoptosis; it regulates the pathway that does.
Why Is regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway Important in Cell Biology?
GO:1903381 matters because ER stress-induced neuronal apoptosis is a convergent mechanism of neuronal loss in acute brain injury and chronic neurodegeneration. In hypoxic-ischemic encephalopathy, molecular chaperones that buffer ER stress are candidate neuroprotective regulators, and in traumatic brain injury, ER stress-induced apoptosis in the penumbra aggravates secondary damage in rats. Because the pathway is kinase-driven and chemically tractable, it is also a drug-discovery target: cell-based screens have identified cytoprotective modulators of ASK1 that suppress ER stress-induced death. Annotating genes to GO:1903381 therefore helps prioritize neuroprotective candidates and interpret functional genomics screens.
• Defines a specific neuronal death mechanism distinct from generic apoptosis.
• Links ER proteostasis failure to intrinsic apoptotic signaling in post-mitotic neurons.
• ASK1 (MAP3K5) is a druggable node whose modulation is cytoprotective in ER stress models.
• ER stress-induced apoptosis in the penumbra worsens secondary injury after traumatic brain injury.
• Molecular chaperones are candidate regulators relevant to hypoxic-ischemic encephalopathy.
• Provides an annotation target for CRISPR screens of neuronal survival.
• Supports mechanism-based interpretation of neuroprotective drug screens.
• Helps distinguish ER-stress-driven death from extrinsic or caspase-independent death.
• Relevant to both acute injury and chronic neurodegenerative disease models [1,2].
• Enables cross-species comparison of neuronal ER stress responses [1,2].
What Happens During regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway?
ER stress initiation and UPR engagement
In simple terms: When the ER cannot fold proteins properly, a stress alarm called the unfolded protein response is switched on.
The pathway begins when ER folding capacity is exceeded, causing accumulation of misfolded proteins and activation of the unfolded protein response (UPR). In neurons, this stress response is a primary trigger for downstream apoptotic signaling, and chaperones that improve ER folding can modulate the response. The UPR is an adaptive attempt to restore proteostasis; regulation of GO:1903381 determines whether this adaptation succeeds or tips into apoptosis.
ASK1-dependent apoptotic signaling
In simple terms: A stress kinase called ASK1 acts as a switch that can pass the ER stress signal toward cell death.
ASK1 (MAP3K5) is a redox-sensitive kinase that couples ER stress to apoptotic signaling, and chemical biology investigation of ER stress-induced cell death has identified cytoprotective modulators of ASK1. This places ASK1 among the key regulatory nodes of GO:1903381, because modulating its activity changes the rate of ER stress-induced death. The same study framework demonstrates that small molecules can be used to probe and regulate this pathway.
Intrinsic apoptotic execution in neurons
In simple terms: Once the decision to die is made, the neuron dismantles itself through an internal suicide program.
The term specifies neuron intrinsic apoptotic signaling, meaning the death program is executed through intracellular mitochondrial-type apoptotic signaling rather than extrinsic death-receptor signaling. In vivo, ER stress-induced apoptosis in the penumbra aggravates secondary damage in rats with traumatic brain injury, showing that execution of this program has measurable tissue-level consequences. Regulation of GO:1903381 therefore operates at the decision point between survival signaling and apoptotic execution [1,2].
Chaperone-mediated modulation
In simple terms: Helper proteins called chaperones can buffer the stress and keep neurons alive.
Molecular chaperones are established modulators of ER stress responses and are candidate regulators of neuronal survival in hypoxic-ischemic encephalopathy. By assisting protein folding, chaperones reduce the load that would otherwise drive apoptotic signaling, thereby acting as negative regulators of GO:1903381. This makes chaperone pathways attractive targets for neuroprotection.
Pathway amplification in injured tissue
In simple terms: In injured brain tissue, this death pathway can spread damage beyond the initial injury.
In the penumbra of rats with traumatic brain injury, ER stress-induced apoptosis aggravates secondary damage, indicating that regulation of this pathway influences lesion expansion. This in vivo evidence supports the view that GO:1903381 is a modifiable determinant of outcome after acute brain injury. It also provides a rationale for testing regulators identified in vitro in animal injury models.
Key Genes Involved in GO:1903381 regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway
The following genes and proteins are experimentally implicated in ER stress-induced neuronal apoptosis and its regulation, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MAP3K5 (ASK1) | Redox-sensitive kinase coupling ER stress to apoptotic signaling | Cytoprotective modulators of ASK1 have been identified in ER stress cell death assays |
| HSPA5 (BiP/GRP78) | ER chaperone that buffers misfolded protein load | Chaperone modulation is a candidate neuroprotective strategy in hypoxic-ischemic encephalopathy |
| HSP90 family chaperones | Molecular chaperones involved in ER stress responses | Chaperone biology is linked to neuronal survival under ER stress |
| HSPB1 (HSP27) | Small heat shock protein contributing to proteostasis | Chaperone networks are candidate regulators of ER stress-induced neuronal death |
| HSP70 family | Molecular chaperones that assist protein folding | Chaperone-mediated modulation of ER stress is relevant to hypoxic-ischemic encephalopathy |
| DDIT3 (CHOP) | UPR transcription factor associated with ER stress-induced apoptosis | Readout of pro-apoptotic UPR signaling in neurons |
| CASP3 | Executioner caspase in intrinsic apoptosis | Downstream marker of apoptotic execution in neurons |
| CASP9 | Initiator caspase of the intrinsic apoptotic pathway | Marker of mitochondrial-type apoptotic signaling |
| BAX | Pro-apoptotic BCL-2 family effector | Intrinsic apoptosis effector in neurons |
| BCL2 | Anti-apoptotic BCL-2 family protein | Modulator of intrinsic apoptotic threshold |
| ERN1 (IRE1) | UPR sensor kinase/endonuclease | Upstream UPR signaling node |
| EIF2AK3 (PERK) | UPR sensor kinase regulating translation | Links ER stress to translational control |
| ATF6 | UPR transcription factor | Adaptive UPR transcription arm |
| MAPK8 (JNK) | Stress kinase downstream of ASK1 | Apoptotic signaling effector modulated in ASK1 chemical biology studies |
| MAPK14 (p38) | Stress-activated MAP kinase | Downstream stress signaling node |
| TNFRSF10B (DR5) | Death receptor implicated in ER stress-related signaling | Context-dependent apoptotic signaling component |
| BCL2L11 (BIM) | BH3-only pro-apoptotic protein | Intrinsic apoptosis regulator in neurons |
| PMAIP1 (NOXA) | BH3-only pro-apoptotic protein | Intrinsic apoptosis regulator in neurons |
How Is regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway Regulated?
Regulation of GO:1903381 is exerted at multiple levels. Upstream, the UPR sensors ERN1 (IRE1), EIF2AK3 (PERK) and ATF6 determine whether ER stress is resolved or converted into apoptotic signaling. The redox-sensitive kinase ASK1 (MAP3K5) is a central regulatory node, and its chemical modulation is cytoprotective in ER stress-induced cell death assays. Molecular chaperones act as negative regulators by improving ER folding capacity, and chaperone-based modulation is a candidate strategy in hypoxic-ischemic encephalopathy. In injured brain tissue, the balance of these regulators determines the extent of secondary damage after traumatic brain injury.
regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MAP3K5 (ASK1) | ER stress-induced apoptotic signaling | Neuronal cell line with ASK1 knockout or point mutation |
| HSPA5 (BiP/GRP78) | Hypoxic-ischemic encephalopathy chaperone biology | Primary neuron overexpression or knockout |
| DDIT3 (CHOP) | Pro-apoptotic UPR signaling | Reporter knock-in for CHOP expression |
| CASP3 | Intrinsic apoptotic execution | Caspase activity assay in knockout neurons |
| ERN1 (IRE1) | UPR sensor signaling | Kinase-dead point-mutation knock-in |
Hypoxic-ischemic encephalopathy
Hypoxic-ischemic encephalopathy involves oxygen and glucose deprivation that perturbs ER proteostasis, and molecular chaperones that modulate ER stress responses are candidate regulators of neuronal survival in this condition. Because GO:1903381 governs whether ER stress kills neurons, chaperone and UPR nodes are plausible therapeutic targets.
Traumatic brain injury
In rats with traumatic brain injury, ER stress-induced apoptosis in the penumbra aggravates secondary damage, demonstrating that regulation of this pathway influences lesion progression. This supports targeting GO:1903381 regulators to limit secondary injury.
Neurodegenerative proteostasis disorders
Because GO:1903381 is triggered by ER stress and executed through intrinsic apoptosis in neurons, it is mechanistically relevant to neurodegenerative conditions characterized by proteostatic imbalance. Chaperone biology and ASK1 signaling provide entry points for experimental intervention [1,3].
Drug discovery for neuroprotection
Chemical biology investigation of ER stress-induced cell death has revealed cytoprotective modulators of ASK1, showing that the pathway is pharmacologically tractable. Such modulators provide tool compounds for validating GO:1903381 regulators in neuronal models.
From regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for ER stress-induced neuronal apoptosis? | CRISPR knockout in neuronal cell line or primary neurons |
| Does a specific kinase activity mediate the apoptotic switch? | Point-mutation knock-in of kinase-dead or constitutively active allele |
| Does a disease-associated variant alter pathway regulation? | Knock-in of the variant allele with isogenic control |
| Where and when is the regulator expressed during ER stress? | Tagged knock-in with fluorescent or epitope tag |
| Does overexpression of a chaperone protect neurons? | Overexpression model in neuronal cells or animals |
| Does a small molecule modulate the pathway? | Chemical biology assay with ASK1 modulators |
How to Study the regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cell viability assay | Survival after ER stress | Screening cytoprotective modulators |
| Caspase activity assay | Apoptotic execution | Confirming intrinsic apoptosis in neurons |
| Western blot for CHOP/caspases | UPR and apoptotic protein levels | Mechanistic readout in neuronal stress models |
| Immunohistochemistry | Apoptotic cells in brain tissue | Penumbra analysis after traumatic brain injury |
| Chemical screen | Identification of pathway modulators | ASK1 modulator discovery |
| CRISPR knockout | Requirement of a gene for pathway regulation | Causal testing of candidate regulators |
| Point-mutation knock-in | Role of a specific residue or activity | Kinase-dead or active allele studies |
| Overexpression | Sufficiency of a regulator | Chaperone neuroprotection studies |
Cell death and viability assays
Measuring viability and caspase activation after ER stress induction is the primary way to quantify regulation of GO:1903381. Chemical biology studies use such assays to identify cytoprotective modulators of ASK1.
UPR and apoptotic marker analysis
Expression of UPR and apoptotic markers such as CHOP and caspases reports whether ER stress is being resolved or converted into apoptosis. These readouts are used in neuronal injury models and in vitro stress paradigms.
In vivo injury models
Rodent models of traumatic brain injury allow assessment of ER stress-induced apoptosis in the penumbra and its contribution to secondary damage. Such models test whether regulating the pathway changes tissue outcome.
Chemical and genetic perturbation
Small-molecule modulators and genetic perturbation (knockout, point mutation, overexpression) are combined to establish causality for regulators of GO:1903381. Chaperone-focused interventions provide an additional perturbation axis.
How CRISPR Can Be Used to Study GO:1903381 regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway
Knockout
CRISPR knockout of candidate regulators such as MAP3K5 (ASK1) or chaperone genes allows direct testing of whether the gene is required for ER stress-induced neuronal apoptosis. Loss-of-function models are the first step in assigning a gene to GO:1903381.
Point Mutation
Point-mutation knock-in can disable or constitutively activate a kinase domain, separating catalytic activity from scaffolding function in pathway regulation. This is particularly informative for ASK1-dependent signaling.
Knock-in
Knock-in of disease-associated variants or tagged alleles enables allele-specific analysis of pathway regulation and expression localization in neurons. Isogenic controls strengthen causal interpretation.
Overexpression
Overexpression of chaperones or anti-apoptotic regulators tests sufficiency for neuroprotection against ER stress-induced death. Combined with knockout, it defines the direction of regulation for GO:1903381.
How EDITGENE Supports regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway Research
Researchers studying regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway-related genes often need to determine whether a candidate gene is causally involved in modulating ER stress-induced neuronal death, rather than merely correlating with it. EDITGENE provides the CRISPR cell models and screening services required to move from association to causation in this pathway.
Contact EDITGENE today to design your custom CRISPR model for regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway research.
Frequently Asked Questions About regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway
What is GO:1903381?
GO:1903381 is the Gene Ontology biological process term for regulation of endoplasmic reticulum stress-induced neuron intrinsic apoptotic signaling pathway, meaning any process that modulates the frequency, rate or extent of neuron intrinsic apoptosis triggered by ER stress.
What does regulation of ER stress-induced neuron apoptosis mean?
It refers to processes that increase or decrease the rate at which ER stress causes neurons to undergo intrinsic apoptosis.
What genes are involved in ER stress-induced neuronal apoptosis?
Genes implicated include MAP3K5 (ASK1), chaperones such as HSPA5, UPR sensors ERN1 and EIF2AK3, and apoptotic effectors such as caspases and BCL-2 family members [1,3].
How is ASK1 involved in ER stress-induced neuron death?
ASK1 (MAP3K5) is a redox-sensitive kinase that couples ER stress to apoptotic signaling, and chemical modulators of ASK1 are cytoprotective in ER stress cell death assays.
Is ER stress-induced apoptosis relevant to traumatic brain injury?
Yes, ER stress-induced apoptosis in the penumbra aggravates secondary damage in rats with traumatic brain injury.
What role do molecular chaperones play in this pathway?
Molecular chaperones buffer ER stress and are candidate regulators of neuronal survival in hypoxic-ischemic encephalopathy.
How can CRISPR be used to study GO:1903381?
CRISPR knockout, point-mutation knock-in, tagged knock-in and overexpression models allow causal testing of candidate regulators of ER stress-induced neuronal apoptosis.
What experimental models are used for ER stress-induced neuronal apoptosis?
Neuronal cell lines, primary neurons, chemical biology assays and rodent injury models such as traumatic brain injury are commonly used [2,3].
What is the difference between ER stress-induced apoptosis and general apoptosis?
GO:1903381 specifies both the trigger (ER stress), the cell type (neuron) and the apoptotic mode (intrinsic), making it more precise than generic apoptosis terms.
Why is GO:1903381 important for drug discovery?
Because ASK1 and chaperone nodes are chemically tractable, and modulators of ER stress-induced death have been identified in cell-based screens [1,3].
Conclusion
GO:1903381 provides a precise, experimentally grounded framework for studying how ER stress is converted into intrinsic apoptotic death in neurons. The pathway is regulated by UPR sensors, chaperones and the redox-sensitive kinase ASK1, and its dysregulation contributes to secondary damage in traumatic brain injury and to neuronal vulnerability in hypoxic-ischemic encephalopathy [1,2,3]. Because the pathway is both mechanistically defined and pharmacologically tractable, it is well suited to CRISPR-based causal genomics. Knockout, point-mutation, knock-in and overexpression models, combined with chemical biology and in vivo injury paradigms, can determine which regulators truly modulate GO:1903381 and which are merely correlated [1,2,3].
References
- 1. Hua C et al.. 2017. Molecular chaperones and hypoxic-ischemic encephalopathy.. Neural Regen Res 12(1):153-160 PMID: 28250763
- 2. Sun GZ et al.. 2016. Endoplasmic reticulum stress-induced apoptosis in the penumbra aggravates secondary damage in rats with traumatic brain injury.. Neural Regen Res 11(8):1260-6 PMID: 27651773
- 3. Kim I et al.. 2009. Chemical biology investigation of cell death pathways activated by endoplasmic reticulum stress reveals cytoprotective modulators of ASK1.. J Biol Chem 284(3):1593-603 PMID: 19004820
