GO:1902236 negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902236 describes a biological process that dampens the intrinsic apoptotic signaling pathway triggered by endoplasmic reticulum (ER) stress, thereby promoting cell survival under proteostatic stress.
• The term is defined as any process that stops, prevents, or reduces the frequency, rate, or extent of the ER stress-induced intrinsic apoptotic signaling pathway.
• Key molecular players include HSPB1 (HSP27), which facilitates ERK-mediated phosphorylation and degradation of BIM to attenuate ER stress-induced apoptosis, and HSP72 (HSPA1A), which enhances IRE1alpha-XBP1 signaling through a physical interaction to protect cells from ER stress-induced apoptosis.
• Dysregulation of this process is implicated in cancer chemoresistance, neurodegeneration, and metabolic disorders, making it a target for therapeutic intervention.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models are essential to dissect the causal roles of genes such as HSPB1 and HSP72 in this pathway.
• EDITGENE provides end-to-end services for generating and screening such models, including CRISPR library screening and bioinformatics support.
Description
The endoplasmic reticulum (ER) is a central organelle for protein folding and lipid synthesis, and its dysfunction leads to ER stress, which can trigger the intrinsic apoptotic signaling pathway. To maintain cellular homeostasis, cells have evolved negative regulatory mechanisms that attenuate ER stress-induced apoptosis, a process formally annotated as GO:1902236, negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway. This biological process is critical for cell fate decisions under conditions of proteotoxic stress, and its dysregulation contributes to a range of human diseases, including cancer and neurodegeneration. Understanding the molecular players and regulatory logic of GO:1902236 is therefore of broad biomedical importance. Recent studies have identified heat shock proteins as key negative regulators of ER stress-induced apoptosis. HSPB1 (also known as HSP27) facilitates ERK-mediated phosphorylation and degradation of BIM, a pro-apoptotic BCL-2 family member, thereby attenuating ER stress-induced apoptosis. Similarly, HSP72 (HSPA1A) protects cells from ER stress-induced apoptosis by enhancing IRE1alpha-XBP1 signaling through a physical interaction. These findings highlight the existence of dedicated molecular circuits that negatively regulate the intrinsic apoptotic pathway downstream of ER stress. For researchers, GO:1902236 provides a conceptual framework to study how cells survive ER stress and how this survival advantage can be exploited or targeted in disease contexts. This article synthesizes the current knowledge on the mechanisms, key genes, and experimental models relevant to this GO term, with a focus on CRISPR-based approaches for functional validation.
negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway At A Glance
| GO ID | GO:1902236 |
|---|---|
| GO term | negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Attenuation of ER stress-induced intrinsic apoptosis to promote cell survival |
| Key regulators | HSPB1 (HSP27), HSP72 (HSPA1A) |
| Associated pathways | ERK-mediated BIM phosphorylation and degradation; IRE1alpha-XBP1 signaling |
| Disease relevance | Cancer chemoresistance, neurodegeneration, metabolic disorders |
What Is GO:1902236?
GO:1902236 is a biological process term that refers to any process that stops, prevents, or reduces the frequency, rate, or extent of the endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway. In other words, it encompasses molecular events that counteract the cell death program initiated by ER stress, thereby promoting cell survival under conditions that would otherwise trigger apoptosis.
Why Is negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Important in Cell Biology?
GO:1902236 is important because it defines a cell survival mechanism that operates under ER stress, a condition implicated in numerous pathologies. By negatively regulating the intrinsic apoptotic pathway, cells can avoid death triggered by misfolded protein accumulation, which is beneficial in acute stress but can be detrimental when hijacked by cancer cells to resist therapy. Understanding this process provides insights into fundamental cell fate decisions and offers potential targets for therapeutic intervention in diseases where ER stress plays a role.
• Maintains cell survival during ER stress by preventing intrinsic apoptosis.
• Involved in cancer chemoresistance, as tumor cells may upregulate negative regulators to evade apoptosis.
• Implicated in neurodegeneration, where chronic ER stress and failed adaptive responses contribute to neuronal loss.
• Provides mechanistic insights into the crosstalk between ER stress and apoptotic signaling.
• Key regulators such as HSPB1 and HSP72 are potential therapeutic targets.
• Essential for understanding proteostasis and cellular stress responses.
• Relevant to metabolic disorders where ER stress is a contributing factor.
• Guides development of CRISPR models to study gene function in this pathway.
What Happens During negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway?
ER Stress Sensing and Initiation of Apoptosis
In simple terms: When the ER gets stressed by misfolded proteins, it sends signals that can lead to cell death.
ER stress activates three main sensors: PERK, ATF6, and IRE1alpha. Under prolonged stress, these sensors can trigger the intrinsic apoptotic pathway, often through upregulation of pro-apoptotic factors such as BIM and activation of BAX/BAK. This initiation step is the target of negative regulation by GO:1902236.
HSPB1-Mediated BIM Degradation
In simple terms: A protein called HSPB1 helps tag the death-promoting protein BIM for destruction, reducing the cell's urge to die.
HSPB1 facilitates ERK-mediated phosphorylation of BIM, which leads to its degradation, thereby attenuating ER stress-induced apoptosis. This represents a direct negative regulatory mechanism where a chaperone-like protein promotes survival by eliminating a pro-apoptotic BCL-2 family member.
HSP72 Enhancement of IRE1alpha-XBP1 Signaling
In simple terms: Another protein, HSP72, boosts a survival signal from the ER to protect cells from stress-induced death.
HSP72 physically interacts with IRE1alpha and enhances its signaling to XBP1, promoting adaptive responses that counteract ER stress-induced apoptosis. This mechanism shifts the balance from death to survival by reinforcing the unfolded protein response (UPR) arm that supports protein folding and degradation.
Integration of Survival Signals
In simple terms: The cell integrates multiple survival signals to decide whether to live or die under ER stress.
Negative regulation of ER stress-induced intrinsic apoptosis involves the integration of chaperone-mediated degradation of pro-apoptotic factors (e.g., BIM) and enhancement of adaptive UPR signaling (e.g., IRE1alpha-XBP1). These pathways collectively reduce the frequency and extent of apoptosis, allowing cells to survive proteotoxic stress.
Key Genes Involved in GO:1902236 negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
The following genes and proteins have been experimentally implicated in the negative regulation of ER stress-induced intrinsic apoptotic signaling pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSPB1 | Facilitates ERK-mediated phosphorylation and degradation of BIM to attenuate ER stress-induced apoptosis | Key negative regulator; target for cancer therapy |
| HSP72 (HSPA1A) | Enhances IRE1alpha-XBP1 signaling via physical interaction to protect from ER stress-induced apoptosis | Critical for adaptive UPR and survival |
| BIM (BCL2L11) | Pro-apoptotic BCL-2 family member; its degradation is promoted by HSPB1 | Effector of apoptosis; regulated by negative pathway |
| IRE1alpha (ERN1) | ER stress sensor; its signaling is enhanced by HSP72 to promote survival | Central node in UPR and apoptosis regulation |
| XBP1 | Transcription factor downstream of IRE1alpha; promotes adaptive UPR | Mediator of survival signaling |
| ERK (MAPK1/MAPK3) | Phosphorylates BIM, leading to its degradation | Kinase involved in negative regulation |
| PERK (EIF2AK3) | ER stress sensor; can trigger apoptosis under prolonged stress | Potential target for modulating the pathway |
| ATF6 | ER stress sensor; activates adaptive UPR genes | Contributes to survival under ER stress |
| BAX | Pro-apoptotic effector; activated by ER stress | Downstream apoptosis executor |
| BAK | Pro-apoptotic effector; activated by ER stress | Downstream apoptosis executor |
| BCL-2 | Anti-apoptotic protein; inhibits BAX/BAK | Modulates apoptosis threshold |
| BCL-xL | Anti-apoptotic protein; inhibits BAX/BAK | Modulates apoptosis threshold |
| CHOP (DDIT3) | Pro-apoptotic transcription factor induced by ER stress | Marker of ER stress-induced apoptosis |
| CASPASE-3 | Executioner caspase in apoptosis | Readout of apoptosis |
| CASPASE-7 | Executioner caspase in apoptosis | Readout of apoptosis |
| CASPASE-9 | Initiator caspase in intrinsic apoptosis | Readout of intrinsic apoptosis |
| CYTOCHROME C | Released from mitochondria to activate caspases | Marker of mitochondrial outer membrane permeabilization |
| APAF-1 | Forms apoptosome with cytochrome c and caspase-9 | Component of intrinsic apoptosis machinery |
How Is negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Regulated?
The negative regulation of ER stress-induced intrinsic apoptotic signaling pathway is itself regulated at multiple levels. HSPB1 activity can be modulated by phosphorylation and its interaction with ERK signaling components. HSP72 levels are induced by heat shock and other stresses, and its interaction with IRE1alpha is critical for enhancing adaptive UPR signaling. Additionally, the balance between pro-apoptotic and anti-apoptotic BCL-2 family members, as well as the intensity and duration of ER stress, determines whether the negative regulatory mechanisms prevail.
negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSPB1 | Cancer chemoresistance | Knockout and overexpression in cancer cell lines |
| HSP72 | Neurodegeneration, cancer | Knock-in of point mutations affecting IRE1alpha interaction |
| BIM | Apoptosis regulation | Point mutation of ERK phosphorylation sites |
| IRE1alpha | ER stress-related diseases | Knockout and tagged knock-in for interaction studies |
| XBP1 | Metabolic disorders | Overexpression and knockout models |
Cancer Chemoresistance
Upregulation of negative regulators such as HSPB1 and HSP72 can confer resistance to chemotherapy by preventing ER stress-induced apoptosis. Targeting these proteins or their pathways may sensitize tumor cells to treatment.
Neurodegeneration
Chronic ER stress is a feature of neurodegenerative diseases, and impaired negative regulation may contribute to neuronal loss. Enhancing survival signaling could be protective.
Metabolic Disorders
ER stress is implicated in insulin resistance and diabetes, where negative regulation of apoptosis may influence beta-cell survival.
From negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HSPB1 increase ER stress-induced apoptosis? | HSPB1 knockout cell line |
| Does HSP72 point mutation affect IRE1alpha binding? | HSP72 point-mutation knock-in |
| Can overexpression of HSPB1 protect against ER stress? | HSPB1 overexpression cell line |
| How does BIM phosphorylation affect its degradation? | BIM phospho-mutant knock-in |
| What is the interactome of IRE1alpha under ER stress? | Tagged knock-in of IRE1alpha |
| Can CRISPR library screening identify new regulators? | Genome-wide CRISPR knockout library |
How to Study the negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Gene essentiality and pathway regulators | Identify novel negative regulators |
| RNA-seq | Transcriptional changes | Measure UPR gene expression |
| Phosphoproteomics | Phosphorylation events | Detect BIM phosphorylation |
| Co-immunoprecipitation | Protein-protein interactions | Study HSP72-IRE1alpha binding |
| Flow cytometry | Apoptosis rate | Quantify cell death under ER stress |
| Western blot | Protein levels and cleavage | Assess BIM degradation and caspase activation |
| Luciferase reporter | XBP1 splicing or UPR activation | Measure IRE1alpha-XBP1 signaling |
| CRISPR library screening | Pooled gene knockout effects | Discover new pathway components |
CRISPR Knockout Screening
Genome-wide CRISPR knockout screens can identify genes whose loss alters ER stress-induced apoptosis, revealing novel negative regulators.
RNA-seq and Transcriptomics
RNA sequencing measures changes in gene expression upon ER stress and can uncover pathways co-regulated with HSPB1 or HSP72.
Proteomics and Phosphoproteomics
Mass spectrometry-based proteomics can detect BIM phosphorylation and degradation, as well as interaction partners of HSP72 and IRE1alpha.
Imaging and Apoptosis Assays
Fluorescence microscopy and flow cytometry with Annexin V/PI staining quantify apoptosis rates under ER stress conditions.
How CRISPR Can Be Used to Study GO:1902236 negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
Knockout
CRISPR knockout of HSPB1 or HSP72 can validate their roles as negative regulators of ER stress-induced apoptosis. Loss-of-function models show increased sensitivity to ER stress.
Point Mutation
Introducing point mutations in BIM at ERK phosphorylation sites can prevent its degradation, testing the importance of this regulatory axis. Similarly, mutations in HSP72 can disrupt its interaction with IRE1alpha.
Knock-in
Tagged knock-in of IRE1alpha or HSP72 allows for interaction studies and live-cell imaging under ER stress. Knock-in of reporter genes can monitor pathway activity.
Overexpression
Overexpression of HSPB1 or HSP72 can protect cells from ER stress-induced apoptosis, confirming their sufficiency in negative regulation.
How EDITGENE Supports negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway Research
Researchers studying negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway-related genes often need to determine whether a candidate gene is causally involved in this process or merely correlated with it. EDITGENE provides the tools and services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway research.
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| Park7 Knockout HT22 Cell Line | EDJ-KQ72 | Mouse | 57320 | Details Get a Quote |
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Frequently Asked Questions About negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway
What is GO:1902236?
GO:1902236 is a Gene Ontology biological process term for negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway, which encompasses processes that reduce or prevent apoptosis triggered by ER stress.
What genes are involved in negative regulation of ER stress-induced apoptosis?
Key genes include HSPB1 (HSP27), which promotes BIM degradation, and HSP72 (HSPA1A), which enhances IRE1alpha-XBP1 signaling.
How does HSPB1 inhibit ER stress-induced apoptosis?
HSPB1 facilitates ERK-mediated phosphorylation and degradation of BIM, thereby attenuating the intrinsic apoptotic pathway.
What is the role of HSP72 in ER stress?
HSP72 physically interacts with IRE1alpha and enhances XBP1 signaling to protect cells from ER stress-induced apoptosis.
Why is negative regulation of ER stress-induced apoptosis important in cancer?
Cancer cells may upregulate negative regulators like HSPB1 and HSP72 to evade apoptosis and resist chemotherapy.
What experimental models are used to study GO:1902236?
CRISPR knockout, point mutation, knock-in, and overexpression cell models are commonly used to dissect gene function in this pathway.
Can CRISPR screening identify new regulators of ER stress-induced apoptosis?
Yes, genome-wide CRISPR knockout screens can uncover novel genes that negatively regulate ER stress-induced apoptosis.
What diseases are associated with dysregulation of ER stress-induced apoptosis?
Cancer, neurodegeneration, and metabolic disorders are among the diseases linked to altered regulation of this pathway.
How does IRE1alpha-XBP1 signaling promote survival?
IRE1alpha-XBP1 signaling enhances the unfolded protein response to restore ER homeostasis and prevent apoptosis.
What services does EDITGENE offer for studying this pathway?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression models, library screening, and bioinformatics services.
Conclusion
GO:1902236 represents a critical cell survival mechanism that counteracts ER stress-induced intrinsic apoptosis. Key regulators such as HSPB1 and HSP72 have been shown to attenuate apoptosis through distinct mechanisms, including BIM degradation and enhancement of IRE1alpha-XBP1 signaling. Understanding this pathway has broad implications for cancer, neurodegeneration, and metabolic diseases, and CRISPR-based models are indispensable for functional validation. EDITGENE offers comprehensive services to support research in this field.
References
- 1. 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
- 2. Gupta S et al.. 2010. HSP72 protects cells from ER stress-induced apoptosis via enhancement of IRE1alpha-XBP1 signaling through a physical interaction.. PLoS Biol 8(7):e1000410 PMID: 20625543
