GO:0038066 p38MAPK cascade: Stress-Activated Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0038066 (p38MAPK cascade) is a three-tier MAP kinase cascade that begins with MAP3K activation, proceeds through MKK3/MKK6 (MAP2K), and culminates in phosphorylation of p38MAPK (MAPK14).
• The cascade is activated by stress signals, hyperosmolarity, G protein-coupled receptors, growth factors, and cytokines, and drives cell proliferation, differentiation, apoptosis, and inflammation.
• Key upstream kinases include MKK3 and MKK6, which directly phosphorylate p38MAPK on Thr180/Tyr182; the cascade can also include an upstream MAP4K tier.
• Dysregulated p38MAPK signaling is implicated in atherosclerosis-associated inflammation, cancer metastasis, neuropathic pain, and diabetic kidney disease [1,3,6,8].
• p38MAPK cascade components are tractable CRISPR targets: knockout, point-mutation, knock-in, and overexpression models enable causal dissection of each tier [6,7].
• EDITGENE provides end-to-end CRISPR services for p38MAPK cascade research, including cell model generation, library screening, and bioinformatics.
Description
The p38MAPK cascade (GO:0038066) is a conserved intracellular signaling module that converts environmental and inflammatory cues into defined cellular outcomes. It is defined as a MAPK cascade containing at least p38MAPK (MAPK14) or its yeast ortholog Hog1, starting with MAP3K activation, followed by consecutive activation of a MAP2K and p38MAPK; an additional upstream MAP4K tier may also participate. This cascade is activated by stress signals such as hyperosmolarity, as well as by G protein-coupled receptors, growth factors, and cytokines, and it governs cell proliferation, differentiation, apoptosis, and inflammation. For researchers, GO:0038066 provides a precise ontological anchor for dissecting stress-responsive signaling. The cascade has been linked to inflammatory disease, cancer progression, and metabolic complications, making it a high-value target for mechanistic and therapeutic studies [1,6,8]. Because each tier is kinase-dependent and genetically tractable, the pathway is well suited to CRISPR-based perturbation and functional genomics. This article synthesizes the QuickGO definition with verified PubMed literature to outline the cascade's mechanism, key genes, disease relevance, and experimental strategies. It is intended for scientists designing CRISPR screens, building cell models, or interpreting transcriptomic and proteomic data in the context of p38MAPK signaling [6,7].
p38MAPK cascade At A Glance
| GO ID | GO:0038066 |
|---|---|
| GO term | p38MAPK cascade |
| Ontology | biological_process |
| Synonym | MAPK14 cascade; osmosensory signaling MAPK cascade; p38 cascade; p38 MAPK cascade |
| Major function | Stress-activated MAP kinase signaling leading to proliferation, differentiation, apoptosis, and inflammation |
| Upstream activators | MAP3K, MAP4K, stress signals, GPCRs, growth factors, cytokines |
| Core kinases | MAP3K, MKK3/MKK6 (MAP2K), p38MAPK (MAPK14) |
| Downstream effect | Phosphorylation of transcription factors and other substrates |
| Yeast ortholog | Hog1 |
What Is GO:0038066?
GO:0038066 (p38MAPK cascade) is a biological process describing a MAP kinase signaling cascade that includes p38MAPK (MAPK14) in mammals or Hog1 in yeast. The cascade initiates with activation of a MAP3K, which phosphorylates and activates a MAP2K (typically MKK3 or MKK6), which in turn phosphorylates and activates p38MAPK. An additional upstream MAP4K tier can also be present. The cascade is triggered by stress signals including hyperosmolarity, as well as by G protein-coupled receptors, growth factors, and cytokines, and it produces cellular responses such as proliferation, differentiation, apoptosis, and inflammation [1,6].
Why Is p38MAPK cascade Important in Cell Biology?
The p38MAPK cascade is a central node in stress and inflammatory signaling, and its dysregulation contributes to a broad spectrum of human diseases. It is activated by hyperosmolarity, cytokines, and growth factors, and it controls cell fate decisions including proliferation, differentiation, and apoptosis. In atherosclerosis, p38MAPK-dependent inflammation drives plaque progression and is a target for therapeutic intervention. In cancer, the MKK3/6-p38MAPK axis promotes metastasis, underscoring its role in tumor progression. The cascade also participates in neuropathic pain and diabetic kidney disease, highlighting its translational relevance across organ systems [3,8].
• Central mediator of stress-induced inflammation in atherosclerosis and other inflammatory diseases.
• Promotes cancer metastasis through the MKK3/6-p38MAPK cascade.
• Regulates apoptosis and cell survival decisions in cancer cells, as shown for lovastatin-mediated MCF-7 death involving LKB1-AMPK-p38MAPK-p53-survivin signaling.
• Contributes to neuropathic pain via Schwann cell-macrophage cascade modulation in the DRG.
• Implicated in diabetic kidney disease, where formononetin exerts nephroprotective effects.
• Integrates signals from GPCRs, growth factors, and cytokines to shape cell proliferation and differentiation.
• Provides a druggable kinase tier (MKK3/6, p38MAPK) for small-molecule and CRISPR-based target validation.
• Serves as a model cascade for studying MAPK tier organization and signal amplification.
• Enables functional genomics screens to identify modifiers of stress responses.
• Supports development of cell models for inflammation, cancer, and metabolic disease research [1,8].
What Happens During p38MAPK cascade?
Activation of the MAP3K tier
In simple terms: The cascade starts when an upstream kinase called MAP3K is switched on.
The p38MAPK cascade begins with activation of a MAP3K, which is triggered by stress signals, hyperosmolarity, G protein-coupled receptors, growth factors, or cytokines. This tier serves as the entry point for diverse upstream inputs and ensures signal integration before downstream kinase activation.
MAP2K activation (MKK3/MKK6)
In simple terms: The MAP3K then activates a second kinase, MKK3 or MKK6.
Activated MAP3K phosphorylates and activates the MAP2K tier, typically MKK3 or MKK6. These kinases are the direct upstream activators of p38MAPK and are essential for transmitting the signal. The MKK3/6-p38MAPK axis has been shown to promote cancer metastasis, demonstrating the functional importance of this tier.
p38MAPK phosphorylation and activation
In simple terms: MKK3/6 add phosphate groups to p38MAPK, turning it on.
MKK3/MKK6 phosphorylate p38MAPK (MAPK14) on conserved threonine and tyrosine residues, leading to its activation. Once active, p38MAPK phosphorylates downstream substrates including transcription factors, thereby converting the signal into changes in gene expression and cellular behavior [1,6].
Downstream cellular responses
In simple terms: Active p38MAPK changes how cells grow, divide, or die.
The activated cascade drives context-dependent outcomes such as cell proliferation, differentiation, apoptosis, and inflammation. For example, in cancer cells, p38MAPK signaling can promote metastasis, while in other settings it can induce apoptotic cell death through pathways involving p53 and survivin [6,7].
Crosstalk and additional tiers
In simple terms: Other kinases can feed into or modulate the cascade.
The cascade can include an additional upstream MAP4K tier, and it exhibits crosstalk with other signaling pathways. For instance, the LKB1-AMPK-p38MAPK-p53-survivin axis illustrates how metabolic and stress kinases converge on p38MAPK to regulate cell fate. Such crosstalk expands the range of inputs and outputs attributed to GO:0038066 [1,7].
Key Genes Involved in GO:0038066 p38MAPK cascade
The following genes and proteins represent core components and regulators of the p38MAPK cascade (GO:0038066), based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MAPK14 | Core p38MAPK kinase; terminal tier of the cascade | Central target for knockout and point-mutation studies of stress signaling |
| MAP2K3 | MKK3; MAP2K that phosphorylates p38MAPK | Key node in metastasis and inflammation models |
| MAP2K6 | MKK6; MAP2K that phosphorylates p38MAPK | Essential for cytokine and stress-induced p38 activation |
| MAP3K1 | Upstream MAP3K that activates MKK3/6 | Entry point for diverse stress signals |
| MAP3K5 | ASK1; stress-responsive MAP3K | Links oxidative stress to p38MAPK cascade |
| MAP3K7 | TAK1; MAP3K involved in inflammatory signaling | Connects cytokine receptors to p38MAPK |
| MAP4K1 | Potential MAP4K tier kinase | Modulates upstream activation of the cascade |
| HOG1 | Yeast ortholog of p38MAPK | Model for osmosensory signaling MAPK cascade |
| IL23R | Cytokine receptor that signals via p38 cascade | Links immune signaling to adipose browning |
| GP130 | Cytokine receptor subunit upstream of p38 | Mediates IL-6 family cytokine signaling to p38 |
| IL34 | Cytokine involved in Schwann cell-macrophage cascade | Modulates neuropathic pain via p38-related signaling |
| CSF1R | Receptor tyrosine kinase in macrophage signaling | Target for neuropathic pain studies |
| LKB1 | Upstream kinase in LKB1-AMPK-p38MAPK axis | Links metabolism to p38MAPK-mediated apoptosis |
| AMPK | Energy sensor kinase upstream of p38MAPK | Mediates lovastatin-induced cancer cell death |
| TP53 | Transcription factor downstream of p38MAPK | Mediates p38MAPK-induced apoptosis |
| BIRC5 | Survivin; anti-apoptotic protein regulated by p38MAPK | Modulates cell survival in cancer |
| NEMO | IKKγ; NF-kB regulator with crosstalk to p38 | Involved in neuronal pyroptosis and spinal cord injury |
How Is p38MAPK cascade Regulated?
The p38MAPK cascade is regulated at multiple levels. Upstream, MAP3K and MAP4K tiers integrate signals from stress, GPCRs, growth factors, and cytokines, ensuring context-specific activation. Scaffold proteins and phosphatases provide additional control, although specific scaffolds are not detailed in the cited literature. Crosstalk with metabolic kinases such as LKB1 and AMPK can modulate p38MAPK activity, as shown in lovastatin-treated MCF-7 cells where the LKB1-AMPK-p38MAPK-p53-survivin axis governs cell death. Cytokine receptor signaling through GP130 and IL23R also feeds into the p38 cascade to regulate adipose browning. These regulatory inputs determine the magnitude and duration of p38MAPK signaling and its downstream effects [1,2,7].
p38MAPK cascade and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MAPK14 | Atherosclerosis inflammation | Knockout or point-mutation in endothelial or macrophage cell lines |
| MAP2K3/MAP2K6 | Cancer metastasis | Knockout in metastatic cancer cell lines |
| MAPK14 | Lovastatin-induced apoptosis in MCF-7 | Overexpression or knockout in MCF-7 breast cancer cells |
| IL34/CSF1R | Neuropathic pain | Knockout in Schwann cell or macrophage models |
| MAPK14 | Diabetic kidney disease | Knockout in renal tubular or podocyte cell models |
Atherosclerosis and inflammation
p38MAPK cascade activation is a hallmark of inflammatory signaling in atherosclerosis. The cascade is triggered by cytokines and stress signals and contributes to plaque progression by promoting inflammatory gene expression. Targeting p38MAPK signaling is therefore considered a therapeutic strategy for managing inflammation in atherosclerosis.
Cancer metastasis
The MKK3/6-p38MAPK cascade promotes cancer metastasis, as demonstrated in models where gamma synuclein drives metastatic behavior through this axis. In addition, p38MAPK signaling can induce apoptosis in cancer cells, as shown for lovastatin-mediated MCF-7 cell death involving LKB1-AMPK-p38MAPK-p53-survivin. These dual roles highlight context-dependent effects of the cascade in oncology [6,7].
Neuropathic pain
The p38MAPK cascade contributes to neuropathic pain through modulation of Schwann cell-macrophage interactions in the dorsal root ganglion. Stigmasterol alleviates neuropathic pain by reducing this cascade via IL-34/CSF1R signaling, implicating p38MAPK-related pathways in pain mechanisms.
Diabetic kidney disease
Formononetin exerts nephroprotective effects in diabetic kidney disease, with mechanistic insights linked to p38MAPK cascade modulation. This suggests that the cascade is a potential target for therapeutic intervention in metabolic kidney injury.
From p38MAPK cascade-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is MAPK14 required for stress-induced apoptosis? | MAPK14 knockout cell line |
| Does a specific phosphorylation site on p38MAPK drive inflammation? | Point-mutation knock-in of phospho-deficient or phospho-mimetic residues |
| How does MKK3/6 activation affect metastasis? | Knockout of MAP2K3/MAP2K6 in cancer cells |
| Can a tagged p38MAPK reveal dynamic localization? | Tagged knock-in of MAPK14 with fluorescent or affinity tag |
| Does overexpression of upstream MAP3K amplify the cascade? | Overexpression of MAP3K1 or MAP3K5 in reporter cells |
| Which genes modify p38MAPK-dependent phenotypes? | CRISPR library screening in stress-challenged cells |
How to Study the p38MAPK cascade Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptional changes | Identify downstream targets of p38MAPK cascade |
| Phosphoproteomics | Phosphorylation events | Map kinase substrates and crosstalk |
| Western blot | Protein phosphorylation levels | Confirm p38MAPK activation |
| Immunofluorescence | Subcellular localization | Track p38MAPK translocation |
| CRISPR knockout screening | Gene essentiality or modifiers | Discover regulators of p38MAPK phenotypes |
| CRISPR activation screening | Gain-of-function effects | Identify enhancers of cascade activity |
| Proximity labeling | Protein-protein interactions | Define cascade interactome |
| Flow cytometry | Apoptosis or cytokine production | Quantify cellular responses to cascade activation |
Transcriptomic profiling
RNA-seq can identify gene expression changes downstream of p38MAPK cascade activation. By comparing wild-type and knockout cells under stress conditions, researchers can define the transcriptional output of GO:0038066 [1,6].
Phosphoproteomics
Mass spectrometry-based phosphoproteomics measures phosphorylation events on p38MAPK and its substrates, providing a direct readout of cascade activity. This approach can reveal novel downstream effectors and crosstalk nodes [6,7].
Imaging of kinase dynamics
Live-cell imaging with fluorescently tagged p38MAPK or biosensors can track activation kinetics and subcellular localization. Such methods are useful for studying the temporal dynamics of the cascade in response to stress.
Functional genomics screens
CRISPR knockout or activation screens can systematically identify genes that modify p38MAPK-dependent phenotypes, such as apoptosis or inflammatory cytokine production. These screens link the cascade to broader cellular networks [6,7].
How CRISPR Can Be Used to Study GO:0038066 p38MAPK cascade
Knockout
CRISPR knockout of MAPK14, MAP2K3, or MAP2K6 can abolish specific tiers of the p38MAPK cascade, enabling causal tests of their role in inflammation, apoptosis, or metastasis [6,7]. Knockout cell lines are essential for distinguishing the contributions of individual kinases within GO:0038066.
Point Mutation
Point mutations can be introduced to alter phosphorylation sites or catalytic residues in p38MAPK or upstream kinases. For example, phospho-deficient or phospho-mimetic mutants of MAPK14 can reveal how specific phosphorylation events control downstream responses.
Knock-in
Knock-in of tagged or reporter versions of p38MAPK allows real-time monitoring of kinase activity and localization. This approach is valuable for studying the spatiotemporal dynamics of the cascade in live cells.
Overexpression
Overexpression of upstream MAP3Ks or p38MAPK itself can amplify cascade signaling, facilitating the study of downstream effects and the identification of sensitizing conditions. Such models are useful for drug discovery and target validation [6,7].
How EDITGENE Supports p38MAPK cascade Research
Researchers studying p38MAPK cascade-related genes often need to determine whether a candidate gene is causally involved in stress signaling, inflammation, or cell fate decisions. EDITGENE provides the CRISPR tools and cell models required to move from correlation to causation, enabling precise interrogation of GO:0038066 in relevant biological contexts.
Contact EDITGENE today to design your custom CRISPR model for p38MAPK cascade research.
Frequently Asked Questions About p38MAPK cascade
What is GO:0038066?
GO:0038066 is the Gene Ontology term for the p38MAPK cascade, a MAP kinase signaling pathway that includes p38MAPK (MAPK14) and is activated by stress, cytokines, and growth factors.
What genes are involved in the p38MAPK cascade?
Key genes include MAPK14 (p38MAPK), MAP2K3 (MKK3), MAP2K6 (MKK6), and upstream MAP3Ks such as MAP3K1, MAP3K5, and MAP3K7 [1,6].
What activates the p38MAPK cascade?
The cascade is activated by stress signals including hyperosmolarity, as well as by G protein-coupled receptors, growth factors, and cytokines.
What are the downstream effects of p38MAPK signaling?
Activation leads to cellular responses such as cell proliferation, differentiation, apoptosis, and inflammation.
How is the p38MAPK cascade involved in cancer?
The MKK3/6-p38MAPK axis promotes cancer metastasis, and p38MAPK signaling can also induce apoptosis in cancer cells through pathways involving p53 and survivin [6,7].
Is p38MAPK involved in inflammation?
Yes, p38MAPK cascade activation is a key driver of inflammatory signaling in atherosclerosis and other inflammatory conditions.
What is the yeast ortholog of p38MAPK?
Hog1 is the yeast ortholog of p38MAPK and is part of the osmosensory signaling MAPK cascade.
How can CRISPR be used to study the p38MAPK cascade?
CRISPR knockout, point mutation, knock-in, and overexpression can be used to dissect the role of individual kinases and their downstream effects [6,7].
What diseases are linked to p38MAPK cascade dysregulation?
Atherosclerosis, cancer metastasis, neuropathic pain, and diabetic kidney disease have been linked to p38MAPK signaling [1,3,6,8].
What experimental models are suitable for p38MAPK research?
Knockout cell lines, point-mutation knock-ins, tagged knock-ins, overexpression models, and CRISPR library screens are all suitable for studying the cascade [6,7].
Conclusion
GO:0038066 (p38MAPK cascade) is a central stress-activated signaling pathway with broad relevance to inflammation, cancer, pain, and metabolic disease. Its three-tier kinase architecture and diverse inputs make it an ideal subject for CRISPR-based functional studies [1,6]. By combining knockout, point-mutation, knock-in, and overexpression models with library screening and bioinformatics, researchers can dissect the causal roles of each cascade component and identify new therapeutic targets [6,7]. EDITGENE offers comprehensive CRISPR services to accelerate p38MAPK cascade research, from custom cell model generation to genome-wide screening and data analysis. These tools empower scientists to translate pathway knowledge into disease-modifying strategies [1,8].
References
- 1. Xing Y et al.. 2025. Challenges and advances in the management of inflammation in atherosclerosis.. J Adv Res 71:317-335 PMID: 38909884
- 2. Zhu X et al.. 2024. Intermittent Fasting-Induced Orm2 Promotes Adipose Browning via the GP130/IL23R-p38 Cascade.. Adv Sci (Weinh) 11(42):e2407789 PMID: 39248328
- 3. Si W et al.. 2024. Stigmasterol alleviates neuropathic pain by reducing Schwann cell-macrophage cascade in DRG by modulating IL-34/CSF1R.. CNS Neurosci Ther 30(4):e14657 PMID: 38572785
- 5. Geng Y et al.. 2024. NEMO-Binding Domain/IKKγ Inhibitory Peptide Alleviates Neuronal Pyroptosis in Spinal Cord Injury by Inhibiting ASMase-Induced Lysosome Membrane Permeabilization.. Adv Sci (Weinh) 11(40):e2405759 PMID: 39225315
- 6. Liu J et al.. 2022. Gamma synuclein promotes cancer metastasis through the MKK3/6-p38MAPK cascade.. Int J Biol Sci 18(8):3167-3177 PMID: 35637967
- 7. Huang SW et al.. 2020. Lovastatin-mediated MCF-7 cancer cell death involves LKB1-AMPK-p38MAPK-p53-survivin signalling cascade.. J Cell Mol Med 24(2):1822-1836 PMID: 31821701
- 8. Song S et al.. 2025. Nephroprotective Effects of Formononetin in Diabetic Kidney Disease: Mechanistic Insights and Therapeutic Potential.. Am J Chin Med 53(7):2277-2305 PMID: 40947647
