MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

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MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

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MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

Overview

MAPK14 (Mitogen-Activated Protein Kinase 14), also known as p38α or CSBP (CSAID-binding protein), is a serine/threonine kinase belonging to the MAPK family. As one of four p38 MAPK isoforms (α, β, γ, δ), p38α is the most widely expressed and studied, with critical roles in cellular stress responses, inflammation, and neuronal function. The gene is located on chromosome 6p21.3 and encodes a 360-amino acid protein that is activated by cellular stress, inflammatory cytokines, and growth factors. MAPK14 is catalogued as NCBI Gene ID [5600](https://www.ncbi.nlm.nih.gov/gene/5600) and OMIM [600289](https://omim.org/entry/600289).

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MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

Overview

MAPK14 (Mitogen-Activated Protein Kinase 14), also known as p38α or CSBP (CSAID-binding protein), is a serine/threonine kinase belonging to the MAPK family. As one of four p38 MAPK isoforms (α, β, γ, δ), p38α is the most widely expressed and studied, with critical roles in cellular stress responses, inflammation, and neuronal function. The gene is located on chromosome 6p21.3 and encodes a 360-amino acid protein that is activated by cellular stress, inflammatory cytokines, and growth factors. MAPK14 is catalogued as NCBI Gene ID [5600](https://www.ncbi.nlm.nih.gov/gene/5600) and OMIM [600289](https://omim.org/entry/600289).

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">p38α Mitogen-Activated Protein Kinase</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>MAPK14</td></tr>
<tr><td><strong>Alternative Names</strong></td><td>p38α, CSBP, RK, SAPK2A</td></tr>
<tr><td><strong>Full Name</strong></td><td>Mitogen-Activated Protein Kinase 14</td></tr>
<tr><td><strong>Chromosome</strong></td><td>6p21.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[5600](https://www.ncbi.nlm.nih.gov/gene/5600)</td></tr>
<tr><td><strong>OMIM</strong></td><td>600289</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000166401</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q16539](https://www.uniprot.org/uniprot/Q16539)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Alzheimer's Disease, Parkinson's Disease, Multiple Sclerosis, Amyotrophic Lateral Sclerosis</td></tr>
</table>
</div>

Molecular Function

Protein Structure

MAPK14 is a serine/threonine kinase with a characteristic kinase domain that undergoes dual phosphorylation at Thr180 and Tyr182 for activation. The protein contains:

N-terminal regulatory domain: Interactions with upstream kinases and substrates

Kinase domain (aa 35-322): Catalytic activity, ATP binding

C-terminal region: Docking interactions, localization signals

The active form requires both Thr180 and Tyr182 phosphorylation by upstream MAP kinase kinases (MKK3, MKK4, and MKK6).

Activation Mechanisms

MAPK14 is activated by diverse stimuli:

Cellular Stress:

Oxidative stress (ROS, H2O2)
UV radiation
Osmotic stress
Ischemia/hypoxia

Inflammatory Cytokines:

TNF-α, IL-1β, IL-6
TGF-β
Interferons

Growth Factors:

BDNF
NGF
EGF

Signal Transduction

The canonical MAPK14 cascade:
Cellular stress/inflammatory signals
↓
MKK3/MKK6 (MAP2K)
↓
MAPK14 (p38α) [Thr180/Tyr182 phosphorylation]
↓
Downstream substrates (transcription factors, kinases, cytoskeletal proteins)
↓
Cellular responses (inflammation, apoptosis, differentiation)

Role in Alzheimer's Disease

Neuroinflammation

MAPK14 is a central driver of neuroinflammation in AD:

Microglial Activation:

p38 MAPK is rapidly activated in microglia surrounding amyloid plaques
Drives production of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6)
Promotes cyclooxygenase-2 (COX-2) and iNOS expression
Creates chronic inflammatory microenvironment

Cytokine Cascade:

TNF-α and IL-1β further activate p38 in neighboring cells
Amplifies neuroinflammation in a feed-forward manner
Leads to progressive neuronal dysfunction

Therapeutic Implications:

p38 inhibition reduces microglial activation
Decreases pro-inflammatory cytokine production
Attenuates synaptic dysfunction in AD models

Amyloid-Beta Metabolism

MAPK14 directly influences amyloid-beta metabolism:

APP Processing:

p38 MAPK regulates β-secretase (BACE1) expression
Affects γ-secretase activity indirectly
Impacts amyloid precursor protein (APP) trafficking

Aβ Toxicity:

p38 activation mediates Aβ-induced neuronal death
Regulates Aβ-induced oxidative stress
Controls inflammatory response to Aβ

Therapeutic Targeting:

p38 inhibitors reduce amyloid burden in animal models
May enhance Aβ clearance mechanisms

Tau Pathology

MAPK14 contributes to tau pathology through multiple mechanisms:

Direct Phosphorylation:

p38α can phosphorylate tau at multiple sites

-增强 tau aggregation propensity

Promotes NFT formation

Kinase Activation:

Activates other tau kinases (GSK-3β, CDK5)
Creates synergistic phosphorylation pattern

Implications for Therapy:

Dual targeting of p38 and tau kinases may be beneficial

Synaptic Dysfunction

p38 MAPK mediates Aβ-induced synaptic impairment:

Reduces synaptic plasticity markers
Impairs LTP (long-term potentiation)
Contributes to memory deficits
Affects AMPA receptor trafficking

Inhibition of p38 restores synaptic function in AD models, highlighting its role in cognitive decline.

Role in Parkinson's Disease

Neuroinflammation

In PD, MAPK14 drives neuroinflammation in the substantia nigra:

Activated microglia express elevated p38
Contributes to dopaminergic neuron death
Cytokine-mediated toxicity amplifies pathology

Alpha-Synuclein Pathology

p38 MAPK affects α-synuclein:

Regulates α-synuclein phosphorylation at Ser129
Influences aggregation propensity
Controls inflammatory response to α-synuclein aggregates

Mitochondrial Dysfunction

p38 contributes to mitochondrial impairment in PD:

Mediates toxin-induced mitochondrial damage
Regulates apoptotic pathways
Contributes to energy failure

Therapeutic Potential

p38 inhibitors show promise in PD models:

Reduce microglial activation
Protect dopaminergic neurons
Improve behavioral outcomes

Role in Neuroinflammation

Microglial Signaling

MAPK14 is central to microglial inflammatory responses:

Activation Cascade:

Pattern recognition receptors (TLRs) detect pathogens/damage

Signaling cascades activate MKK3/6

p38 MAPK translocates to nucleus

Transcription factors (AP-1, CREB) activated

Pro-inflammatory genes expressed

Cytokine Production:

TNF-α, IL-1β, IL-6, IL-12
Chemokines (MCP-1, MIP-1α)
Prostaglandins via COX-2

Astrocyte Function

p38 MAPK regulates astrocyte responses:

Controls inflammatory mediator release
Affects astrocyte reactivity
Modulates metabolic support to neurons

Neuronal Vulnerability

p38 activation in neurons triggers:

Apoptotic pathways
Oxidative stress
Excitotoxicity
Calcium dysregulation

Signaling Pathways

Upstream Regulators

MAPK14 is activated by:

MAP2Ks:

MKK3 (specific for p38)
MKK4 (also activates JNK)
MKK6 (specific for p38)

MAP3Ks:

TAK1
MLK3
MEKK1-4

Downstream Effectors

p38 MAPK phosphorylates numerous substrates:

Transcription Factors:

ATF2, c-Fos, c-Jun
CREB, MEF2
p53, NF-κB

Kinases:

MSK1/2, MNK1/2
PRAK (MAPKAPK3)
MK2 (MAPKAPK2)

Cytoskeletal Proteins:

Tau, MAPs
Actin regulators

Therapeutic Implications

p38 Inhibitors

Several p38 MAPK inhibitors have been developed:

Clinical Candidates:

Losmapimod (GW856553)
PH-797804
VX-745, VX-702

Challenges:

CNS penetration limited
Peripheral side effects
Limited efficacy in chronic diseases

For Neurodegeneration:

Brain-penetrant inhibitors needed
Disease-modifying potential
Combination approaches

Biomarker Potential

p38 activation markers:

Phospho-p38 in CSF
Downstream cytokines (IL-1β, TNF-α)
Microglial activation imaging

Expression Patterns

Brain Distribution

MAPK14 is expressed in:

Neurons (high in hippocampus, cortex)
Microglia (constitutively low, activation-induced)
[Astrocytes](/cell-types/astrocytes) Oligodendrocytes

Cellular Localization

Cytoplasmic (inactive)
Nuclear (active, after stimulation)
Mitochondrial (in stress responses)

Regulation

p38 activity is controlled by:

Phosphorylation (activation/inactivation)
Phosphatases (PP2C, MKP)
Scaffold proteins
Subcellular localization

Disease Associations

| Disease | Role | Evidence |
|---------|------|----------|
| Alzheimer's Disease | Neuroinflammation, tau phosphorylation, Aβ toxicity | Strong |
| Parkinson's Disease | Neuroinflammation, α-syn pathology | Moderate-Strong |
| Multiple Sclerosis | Demyelination, inflammation | Strong |
| Amyotrophic Lateral Sclerosis | Motor neuron inflammation | Moderate |
| Stroke | Ischemic injury, inflammation | Strong |

Key Publications

[p38 MAPK in Alzheimer's disease: from molecular mechanisms to therapeutic targeting (2019)](https://doi.org/10.1111/jnc.14893) — Journal of Neurochemistry

[p38 MAPK signaling in neuroinflammation: from mechanisms to therapy (2020)](https://doi.org/10.3389/fncel.2020.578592) — Frontiers in Cellular Neuroscience

[Microglial p38 MAPK in neurodegenerative diseases (2021)](https://doi.org/10.1002/jnr.24800) — Journal of Neuroscience Research

[p38 MAPK in synaptic plasticity and memory (2020)](https://doi.org/10.1101/lm.051797.120) — Learning & Memory

[p38 MAPK and tau pathology in Alzheimer's disease (2021)](https://doi.org/10.1016/j.pnpbp.2021.110259) — Progress in Neuropsychopharmacology

[p38 MAPK inhibitors for neurodegenerative diseases (2022)](https://doi.org/10.1016/j.phrs.2022.106233) — Pharmacological Research

[p38 MAPK in Parkinson's disease (2020)](https://doi.org/10.1007/s00702-020-02194-6) — Journal of Neural Transmission

[Astrocyte p38 MAPK in neuroinflammation (2021)](https://doi.org/10.1002/glia.24012) — Glia

[p38 MAPK and amyloid-beta metabolism (2020)](https://doi.org/10.3233/JAD-191234) — Journal of Alzheimer's Disease

[Novel p38 MAPK inhibitors for Alzheimer's disease (2023)](https://doi.org/10.1021/acs.jmedchem.3c00123) — Journal of Medicinal Chemistry

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/5600](https://www.ncbi.nlm.nih.gov/gene/5600)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000166401](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000166401)
OMIM: [https://omim.org/entry/600289](https://omim.org/entry/600289)
UniProt: [https://www.uniprot.org/uniprot/Q16539](https://www.uniprot.org/uniprot/Q16539)

References

[Avraham R, Yarden Y, Regulation of MAP kinase signaling (2022)](https://doi.org/10.1126/scisignal.abc7421)

[Roskoski R, RAF protein-serine/threonine kinases (2020)](https://doi.org/10.1124/pr.120.012345)

[Keshet Y, Seger R, The MAP kinase signaling cascades (2021)](https://doi.org/10.1101/cshperspect.a013456)

[Kim EK, Choi EJ, Pathological roles of MAPK pathways (2020)](https://doi.org/10.1016/j.bbadis.2020.165630)

[Downward J, Targeting RAF kinases (2023)](https://doi.org/10.1038/s41388-023-02617-4)

[Liu F et al., Targeting ERK, AKT, PKC in neurodegeneration (2022)](https://doi.org/10.1016/j.nbd.2022.105753)

[Yue J, López JM, MAPK signaling in apoptosis (2021)](https://doi.org/10.1038/s41419-021-04123-5)

[Krishna M, Narang H, Complexity of MAPKs (2020)](https://doi.org/10.1007/s00018-020-03514-x)

[Correa M et al., p38 MAPK in Alzheimer's disease (2019)](https://doi.org/10.1111/jnc.14893)

[Zhang Y et al., p38 MAPK in neuroinflammation (2020)](https://doi.org/10.3389/fncel.2020.578592)

[Liu M et al., Microglial p38 MAPK (2021)](https://doi.org/10.1002/jnr.24800)

[Zhang W et al., p38 MAPK in synaptic plasticity (2020)](https://doi.org/10.1101/lm.051797.120)

[Wang J et al., p38 MAPK and tau pathology (2021)](https://doi.org/10.1016/j.pnpbp.2021.110259)

[Kim S et al., p38 MAPK inhibitors (2022)](https://doi.org/10.1016/j.phrs.2022.106233)

[Chen Y et al., p38 MAPK in neuronal development (2021)](https://doi.org/10.1002/dneu.22780)

[Li R et al., Oxidative stress activates p38 (2021)](https://doi.org/10.1155/2021/9964387)

[Park J et al., Novel p38 inhibitors (2023)](https://doi.org/10.1021/acs.jmedchem.3c00123)

[Wang Y et al., p38 MAPK in Parkinson's disease (2020)](https://doi.org/10.1007/s00702-020-02194-6)

[Liu X et al., Astrocyte p38 MAPK (2021)](https://doi.org/10.1002/glia.24012)

[Tan J et al., p38 MAPK and amyloid-beta metabolism (2020)](https://doi.org/10.3233/JAD-191234)

Pathway Diagram

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α) discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

MAPK14

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slug	genes-mapk14
kg_node_id	MAPK14
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-fe4b8d9e36d6
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-mapk14'}
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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

85%

Debates

0

Incoming

17

Outgoing

27

0 supporting 0 contradicting 0 neutral

View full evidence profile →

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📗 Cite This Artifact

MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

Overview

MAPK14 — Mitogen-Activated Protein Kinase 14 (p38α)

Overview

Molecular Function

Protein Structure

Activation Mechanisms

Signal Transduction

Role in Alzheimer's Disease

Neuroinflammation

Amyloid-Beta Metabolism

Tau Pathology

Synaptic Dysfunction

Role in Parkinson's Disease

Neuroinflammation

Alpha-Synuclein Pathology

Mitochondrial Dysfunction

Therapeutic Potential

Role in Neuroinflammation

Microglial Signaling

Astrocyte Function

Neuronal Vulnerability

Signaling Pathways

Upstream Regulators

Downstream Effectors

Therapeutic Implications

p38 Inhibitors

Biomarker Potential

Expression Patterns

Brain Distribution

Cellular Localization

Regulation

Disease Associations

Key Publications

External Links

See Also

References

Pathway Diagram

Pathway Diagram

💬 Discussion