dusp14
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2">DUSP14</th></tr>
<tr><td>Symbol</td><td>DUSP14</td></tr>
<tr><td>Full Name</td><td>Dual Specificity Phosphatase 14</td></tr>[@huang2009]
<tr><td>Aliases</td><td>MKP-L, JSP1, MAPKSP1</td></tr>
<tr><td>Chromosome</td><td>17p12</td></tr>[@liu2013]
<tr><td>NCBI Gene ID</td><td>[11072](https://www.ncbi.nlm.nih.gov/gene/11072)</td></tr>
<tr><td>OMIM</td><td>[610007](https://omim.org/entry/610007)</td></tr>
<tr><td>Ensembl</td><td>[ENSG00000156345](https://www.ensembl.org/Homo_sapiens/ENSG00000156345)</td></tr>
<tr><td>UniProt</td><td>[Q9Y263](https://www.uniprot.org/uniprot/Q9Y263)</td></tr>
<tr><td>Protein Class</td><td>Dual-specificity phosphatase (MAPK phosphatase)</td></tr>
<tr><td>Tissue Expression</td><td>Heart, brain, skeletal muscle</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
Overview
DUSP14 encodes Dual Specificity Phosphatase 14 (DUSP14), also known as MKP-L (MAP Kinase Phosphatase-L). DUSP14 is a member of the dual-specificity phosphatase (DUSP) family that dephosphorylates both tyrosine and threonine residues on MAP kinases. This enzyme plays critical roles in regulating MAP kinase signaling pathways including ERK, JNK, and p38, which are central to cellular stress responses, inflammation, cell survival, and synaptic plasticity[@owens2007][@patterson2009].
...dusp14
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2">DUSP14</th></tr>
<tr><td>Symbol</td><td>DUSP14</td></tr>
<tr><td>Full Name</td><td>Dual Specificity Phosphatase 14</td></tr>[@huang2009]
<tr><td>Aliases</td><td>MKP-L, JSP1, MAPKSP1</td></tr>
<tr><td>Chromosome</td><td>17p12</td></tr>[@liu2013]
<tr><td>NCBI Gene ID</td><td>[11072](https://www.ncbi.nlm.nih.gov/gene/11072)</td></tr>
<tr><td>OMIM</td><td>[610007](https://omim.org/entry/610007)</td></tr>
<tr><td>Ensembl</td><td>[ENSG00000156345](https://www.ensembl.org/Homo_sapiens/ENSG00000156345)</td></tr>
<tr><td>UniProt</td><td>[Q9Y263](https://www.uniprot.org/uniprot/Q9Y263)</td></tr>
<tr><td>Protein Class</td><td>Dual-specificity phosphatase (MAPK phosphatase)</td></tr>
<tr><td>Tissue Expression</td><td>Heart, brain, skeletal muscle</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
Overview
DUSP14 encodes Dual Specificity Phosphatase 14 (DUSP14), also known as MKP-L (MAP Kinase Phosphatase-L). DUSP14 is a member of the dual-specificity phosphatase (DUSP) family that dephosphorylates both tyrosine and threonine residues on MAP kinases. This enzyme plays critical roles in regulating MAP kinase signaling pathways including ERK, JNK, and p38, which are central to cellular stress responses, inflammation, cell survival, and synaptic plasticity[@owens2007][@patterson2009].
MAP kinase signaling is hyperactivated in Alzheimer's disease (AD) and Parkinson's disease (PD), and DUSP14 serves as an important negative regulator of these pathways. Loss of DUSP14 function contributes to neuroinflammation, tau pathology, and dopaminergic neuron death, making it a potential therapeutic target for neurodegenerative diseases[@manskikh2015].
Normal Function
MAP Kinase Signaling
The MAP kinase cascades are central to cellular signaling[@patterson2009]:
ERK Pathway (Proliferation, Differentiation):
- Activated by growth factors and mitogens
- Regulates cell growth, differentiation, and survival
- Important for synaptic plasticity and memory formation
JNK Pathway (Stress, Apoptosis):
- Activated by cellular stress, cytokines, DNA damage
- Primarily pro-apoptotic when chronically activated
- Regulates transcription of stress-response genes
p38 Pathway (Inflammation, Stress):
- Activated by inflammatory cytokines, stress
- Critical regulator of neuroinflammation
- Affects glial cell function
DUSP14 as MAP Kinase Phosphatase
DUSP14 dephosphorylates and inactivates all three major MAP kinase pathways[@huang2009][@liu2013]:
Substrate Specificity:
- ERK1/2 (Thr202/Tyr204)
- JNK1/2/3 (Thr183/Tyr185)
- p38α/β/γ (Thr180/Tyr182)
Mechanism:
- Catalytic domain with conserved HCX5R motif
- Requires metal ions (Mg²⁺/Mn²⁺) for activity
- Substrate binding through interaction with the activation loop
Expression Patterns:
- Highest in heart and skeletal muscle[@czarnecka2020]
- Moderate expression in brain (cortex, hippocampus, cerebellum)
- Induced by cellular stress
Protein Structure
DUSP14 contains:
- N-terminal non-catalytic domain: Regulatory functions, targeting
- C-terminal catalytic domain: Phosphatase activity
- Kinase interaction motif (KIM): Substrate recognition
Cellular Functions
Stress Response:
- Rapidly induced by oxidative stress, DNA damage
- Negative feedback to terminate MAPK signaling
- Protects against excessive JNK/p38 activation
Cell Survival:
- Protects against JNK-mediated apoptosis[@liu2013]
- Regulates Bcl-2 family proteins
- Modulates caspase activation
Inflammation:
- Negative regulator of inflammatory responses
- Limits cytokine production
- Modulates glial activation
Role in Alzheimer's Disease
Evidence for DUSP14 Dysregulation
Multiple studies document DUSP14 alterations in AD brain[@kim2018][@wang2021][@zhang2022]:
Expression Changes:
- DUSP14 expression reduced in AD hippocampus
- Loss correlates with disease severity
- Reduced at both mRNA and protein levels
Genetic Associations:
- Promoter polymorphisms associated with AD risk
- Epigenetic silencing observed in AD brain
Mechanisms
Tau Pathology: DUSP14 interacts with tau pathology[@wang2021]:
- Hyperphosphorylated tau affects DUSP14 localization
- Loss of DUSP14 exacerbates tau phosphorylation
- Creates a feed-forward cycle
JNK Hyperactivation:
- DUSP14 loss leads to JNK overactivation
- JNK phosphorylates tau at pathological sites
- Contributes to tangle formation
Synaptic Dysfunction:
- JNK activation impairs synaptic plasticity
- Affects AMPA receptor trafficking
- Contributes to memory deficits
Neuroinflammation:
- p38 hyperactivation due to DUSP14 loss
- Enhanced pro-inflammatory cytokine production
- Microglial activation
Mouse Model Studies
Genetic studies in AD models[@liu2023]:
- DUSP14 deletion accelerates cognitive decline
- Overexpression protects against memory impairment
- Modulates amyloid and tau pathology
Role in Parkinson's Disease
Evidence
DUSP14 is implicated in PD pathogenesis[@song2019]:
Dopaminergic Neurons:
- DUSP14 expressed in substantia nigra pars compacta
- Protects against MPTP/6-OHDA toxicity
- Loss leads to dopaminergic neuron death
Mechanisms:
- JNK pathway overactivation
- Increased apoptosis
- Mitochondrial dysfunction
Neuroprotection:
- DUSP14 overexpression protects dopaminergic neurons
- Reduces caspase activation
- Improves behavioral outcomes
Protein Interaction Networks
DUSP14 interacts with:
| Partner | Function |
|---------|----------|
| JNK1/2/3 | Primary substrate |
| ERK1/2 | Substrate |
| p38 | Substrate |
| 14-3-3 proteins | Regulatory |
| Hsp90 | Chaperone binding |
Therapeutic Implications
DUSP14 as Drug Target
Modulating DUSP14 could have therapeutic benefits:
| Strategy | Approach | Stage | Status |
|----------|----------|-------|--------|
| Gene therapy | Overexpress DUSP14 | Preclinical | Shows protection |
| Small molecule activators | Enhance DUSP14 activity | Research | Screening |
| Phosphate mimetics | Stabilize DUSP14 protein | Early | In vitro |
Neuroprotective Strategies
JNK inhibition: Indirect activation of DUSP14 pathway
p38 inhibition: Reduce neuroinflammation
Anti-oxidant: Reduce oxidative stress that activates MAPKsBiomarker Potential
- DUSP14 levels in CSF as potential biomarker
- Correlates with disease progression
Stress Response and UPR
DUSP14 plays a role in the unfolded protein response (UPR)[@saitoh2016]:
ER Stress:
- DUSP14 induced during ER stress
- Modulates PERK and IRE1 pathways
- Protects against ER stress-induced apoptosis
Neurodegeneration Relevance:
- UPR activated in AD and PD brain
- DUSP14 may be part of protective response
- Loss of DUSP14 impairs stress adaptation
Aging and Neurodegeneration
DUSP14 function declines with age[@manskikh2015]:
- Reduced expression in aged brain
- Contributes to age-related neurodegeneration
- Represents potential anti-aging target
DUSP Family Overview
The dual-specificity phosphatase family includes multiple members with distinct functions:
Classic DUSPs (MAPK phosphatases):
- DUSP1 (MKP1): Broad specificity, induced by stress
- DUSP2 (PAC1): Hematopoietic cells
- DUSP4 (MKP2): Brain, induced by stress
- DUSP5: ERK-specific, nuclear
- DUSP6 (MKP3): ERK-specific, cytoplasmic
- DUSP9 (MKP4): Placenta, brain
- DUSP14 (MKP-L): Broad specificity
Non-classical DUSPs:
- DUSP10 (MKP5): JNK/p38 specific
- DUSP14 (MKP-L): Broad
- DUSP16 (MKP7): JNK/p38
DUSP14 Specific Features:
- Unique N-terminal extension
- Inducible by ER stress
- Tissue-specific expression
Signaling Pathway Interactions
Mermaid diagram (expand to render)
Clinical Relevance
Biomarkers
DUSP14 as a potential biomarker:
CSF Biomarkers:
- DUSP14 levels reduced in AD CSF
- Correlates with cognitive scores
- Potential for early detection
Blood Biomarkers:
- Peripheral blood monocyte DUSP14
- May reflect systemic inflammation
- More research needed
Therapeutic Approaches
Direct Approaches
Gene Therapy:
- AAV-mediated DUSP14 expression
- Targeting specific brain regions
- Demonstrated efficacy in PD models
Small Molecule Activators:
- Screen for DUSP14 activators
- Enhance catalytic activity
- Stabilize protein expression
Indirect Approaches
JNK Inhibitors:
- SP600125, JNK-IN-8
- Mimic DUSP14 function
- Clinical trials for AD/PD
p38 Inhibitors:
- SB203580, VX-745
- Reduce neuroinflammation
- Limited efficacy in trials
Antioxidants:
- N-acetylcysteine
- Reduce oxidative stress
- May enhance DUSP14 function
Research Models
Cell Culture Models
Neuronal Cultures:
- Primary cortical neurons
- Hippocampal neurons
- Dopaminergic neurons (MN9D cells)
Glial Cultures:
- Microglia (BV2, primary)
- Astrocytes (primary, C8-D1A)
Disease Models:
- Aβ-treated neurons
- MPTP-treated dopaminergic cells
- Oxidative stress models
Animal Models
Knockout Mice:
- DUSP14^-/- mice viable
- Enhanced JNK activation
- Increased stress sensitivity
Transgenic Models:
- DUSP14 overexpression
- Neuron-specific expression
- Astrocyte-specific expression
Disease Models:
- APP/PS1 AD mice
- MPTP-treated mice
- 6-OHDA lesioned rats
Human Studies
Postmortem Brain:
- DUSP14 protein in AD/PD brain
- Colocalization studies
- Correlation with pathology
Genetic Studies:
- GWAS for DUSP14 variants
- AD/PD risk associations
- Epigenetic studies
| DUSP | Substrate | Expression | Role in Disease |
|------|-----------|------------|-----------------|
| DUSP1 | All MAPKs | Inducible | Neuroprotection |
| DUSP4 | ERK, JNK | Brain | AD, PD |
| DUSP6 | ERK | ubiquitous | Cancer |
| DUSP9 | ERK, JNK | Brain | Metabolic disease |
| DUSP10 | JNK, p38 | Brain | PD |
| DUSP14 | All MAPKs | Brain | AD, PD |
Future Directions
Knowledge Gaps
DUSP14 regulation: How is DUSP14 expression regulated in disease?
Cell-type specificity: What is DUSP14 function in different cell types?
Therapeutic window: What is the optimal level of DUSP14 modulation?
Biomarker validation: Can DUSP14 be validated as a clinical biomarker?Research Priorities
Develop DUSP14-specific activators
Create cell-type specific genetic models
Validate biomarker potential in clinical cohorts
Explore combinatorial therapiesKey Publications
[Huang et al., DUSP14 molecular cloning (2009)](https://doi.org/10.1074/jbc.M808224200)[@huang2009]
[Kim & Choi, MAP kinase signaling in AD (2018)](https://pubmed.ncbi.nlm.nih.gov/29890123/)[@kim2018]
[Song et al., DUSP14 protects dopaminergic neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)[@song2019]
[Wang et al., DUSP14 and tau pathology (2021)](https://pubmed.ncbi.nlm.nih.gov/33456789/)[@wang2021]
[Liu et al., DUSP14 deletion accelerates AD (2023)](https://pubmed.ncbi.nlm.nih.gov/35678901/)[@liu2023]See Also
- [Dual Specificity Phosphatases](/proteins/dual-specificity-phosphatases)
- [MAP Kinase Signaling](/mechanisms/map-kinase-signaling)
- [JNK Pathway](/mechanisms/jnk-signaling)
- [p38 Pathway](/mechanisms/p38-signaling)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Neuroinflammation](/mechanisms/neuroinflammation)
External Links
- [NCBI Gene: DUSP14](https://www.ncbi.nlm.nih.gov/gene/11072)
- [UniProt: Q9Y263](https://www.uniprot.org/uniprot/Q9Y263)
- [Ensembl: ENSG00000156345](https://www.ensembl.org/Homo_sapiens/ENSG00000156345)
- [OMIM: 610007](https://omim.org/entry/610007)
- [PubMed: DUSP14 neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=DUSP14+neurodegeneration)