PTEN Protein

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PTEN Protein

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PTEN Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PTEN Protein</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Amino Acids</td>
</tr>
<tr>
<td class="label">Phosphatase domain</td>
<td>14-185</td>
</tr>
<tr>
<td class="label">C2 domain</td>
<td>186-351</td>
</tr>
<tr>
<td class="label">C-terminal tail</td>
<td>352-403</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Compound</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>VO-OHpic</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>SF1670</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>BZLF1</td>
</tr>
<tr>
<td class="label">PTEN modulators</td>
<td>Diphenyl difluoroketone</td>
</tr>
<tr>
<td class="label">AKT activators</td>
<td>SC79</td>
</tr>
<tr>
<td class="label">Biomarker</td>
<td>Sample</td>
</tr>
<tr>
<td class="label">PTEN expression</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="label">p-AKT/AKT ratio</td>
<td>CSF/blood</td>
</tr>
<tr>
<td class="label">p-GS3Kβ/GSK3β</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="label">PIP3 levels</td>
<td>Cell models</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIME

...

PTEN Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PTEN Protein</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Amino Acids</td>
</tr>
<tr>
<td class="label">Phosphatase domain</td>
<td>14-185</td>
</tr>
<tr>
<td class="label">C2 domain</td>
<td>186-351</td>
</tr>
<tr>
<td class="label">C-terminal tail</td>
<td>352-403</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Compound</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>VO-OHpic</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>SF1670</td>
</tr>
<tr>
<td class="label">PTEN inhibitors</td>
<td>BZLF1</td>
</tr>
<tr>
<td class="label">PTEN modulators</td>
<td>Diphenyl difluoroketone</td>
</tr>
<tr>
<td class="label">AKT activators</td>
<td>SC79</td>
</tr>
<tr>
<td class="label">Biomarker</td>
<td>Sample</td>
</tr>
<tr>
<td class="label">PTEN expression</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="label">p-AKT/AKT ratio</td>
<td>CSF/blood</td>
</tr>
<tr>
<td class="label">p-GS3Kβ/GSK3β</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="label">PIP3 levels</td>
<td>Cell models</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1732 edges</a></td>
</tr>
</table>

PTEN (Phosphatase and Tensin Homolog Deleted on Chromosome 10) is a critical tumor suppressor protein that negatively regulates the PI3K/AKT signaling pathway, playing essential roles in neuronal survival, synaptic plasticity, and cellular homeostasis. In the context of neurodegenerative diseases, PTEN dysregulation contributes to the pathogenesis of Alzheimer's disease, Parkinson's disease, ALS, and Huntington's disease through its effects on cell death pathways, protein homeostasis, and metabolic regulation.

Overview

PTEN is a dual-specificity phosphatase that removes phosphate groups from phosphatidylinositol (3,4,5)-trisphosphate (PIP3), converting it back to phosphatidylinositol (4,5)-bisphosphate (PIP2). This enzymatic activity makes PTEN a key negative regulator of the PI3K/AKT/mTOR signaling cascade, which is one of the most important pathways controlling neuronal survival, protein synthesis, [autophagy](/entities/autophagy), and metabolic regulation[@prkking2007].

In the brain, PTEN is expressed in [neurons](/entities/neurons) and glial cells, where it regulates:

Neuronal survival and [apoptosis](/entities/apoptosis)
Synaptic plasticity and memory formation
Protein synthesis through mTORC1 regulation
Autophagy and lysosomal function
Metabolic processes including glucose uptake
Inflammation and immune responses

PTEN dysfunction has been implicated in multiple neurodegenerative disorders, making it an important therapeutic target[@pten2015][@role2019].

Structure

Protein Domains

PTEN is a 403 amino acid protein with a molecular weight of approximately 47.2 kDa. The protein contains several distinct structural domains[@crystal1999]:

Phosphatase Domain

The N-terminal phosphatase domain contains the active site motif HCXXGRXXR, which is essential for PTEN's enzymatic activity. This domain:

Catalyzes the dephosphorylation of PIP3 to PIP2
Requires magnesium ions as cofactors
Has both lipid and protein phosphatase activity

C2 Domain

The C2 domain mediates membrane association through phospholipid binding:

Binds to phospholipid membranes in a calcium-independent manner
Targets PTEN to cellular membranes where its substrate PIP3 resides
Contributes to substrate specificity

C-Terminal Tail

The C-terminal region contains:

Multiple serine/threonine phosphorylation sites (Ser370, Ser380, Thr382, Thr383)
PDZ domain-binding motif
Regulation by phosphorylation and proteolytic cleavage

Post-Translational Modifications

PTEN activity is regulated by several post-translational modifications:

Phosphorylation: Ser380/Thr382/Thr383 phosphorylation inhibits PTEN activity and promotes stability
Oxidation: [Reactive oxygen species](/entities/reactive-oxygen-species) can transiently inhibit PTEN
Ubiquitination: WWP2-mediated ubiquitination targets PTEN for degradation
Acetylation: p300/CBP-mediated acetylation reduces PTEN function

Normal Function

PI3K/AKT Pathway Regulation

The PI3K/AKT signaling pathway is one of the most critical survival pathways in neurons[@pten2019]:

Mermaid diagram (expand to render)

PI3K (Phosphoinositide 3-kinase): Generates PIP3 from PIP2
AKT (Protein Kinase B): Serine/threonine kinase activated by PIP3
mTORC1 (Mechanistic Target of Rapamycin Complex 1): Master regulator of protein synthesis
GSK3beta (Glycogen Synthase Kinase 3beta): Kinase that phosphorylates tau
FOXO (Forkhead Box O): Transcription factor regulating pro-apoptotic genes

Neuronal Functions

In neurons, PTEN plays several critical roles [@insulinlike2011][@pten2020]:

Synaptic Plasticity: PTEN regulates AMPA receptor trafficking and [long-term potentiation](/mechanisms/long-term-potentiation) (LTP)

axon guidance: PTEN gradients influence growth cone behavior

Dendritic Spine Morphogenesis: Controls spine density and morphology

Metabolic Regulation: Regulates neuronal glucose metabolism

Autophagy: Modulates autophagic flux through mTORC1 inhibition

Homeostatic Functions

PTEN maintains cellular homeostasis by:

Preventing excessive cell growth and proliferation
Coordinating metabolic demands with nutrient availability
Regulating the balance between survival and death signals
Integrating cellular energy status with growth factor signaling

Role in Neurodegenerative Diseases

Alzheimer's Disease

PTEN dysregulation contributes to multiple aspects of AD pathogenesis [@gsk2011][@role2018]:

[Amyloid-beta](/proteins/amyloid-beta) effects: Aβ oligomers stimulate PTEN translocation to synapses, where it:

Reduces AKT signaling at synapses
Impairs insulin receptor signaling
Promotes AMPA receptor internalization
Contributes to synaptic loss

Tau pathology: PTEN/AKT/GSK3β dysregulation:

Increases GSK3β activity leading to tau hyperphosphorylation
Promotes NFT formation
Enhances tau spreading between neurons

Therapeutic implications: PTEN inhibitors are being explored for AD treatment to:

Restore AKT signaling and synaptic function
Reduce tau pathology
Improve neuronal survival

Parkinson's Disease

In PD, PTEN plays complex roles in dopaminergic neuron survival [@pten2019a][@pten2019b]:

[α-Synuclein](/proteins/alpha-synuclein) interaction: PTEN may be involved in:

Regulating autophagy pathways that clear α-synuclein
Modulating inflammatory responses to α-synuclein aggregates

Mitochondrial dysfunction: PTEN:

Affects PINK1/PARKIN mitophagy pathways
Modulates mitochondrial biogenesis through PGC-1α

Dopaminergic neuron vulnerability: PTEN may contribute to selective vulnerability through:

Region-specific expression patterns
Interactions with PD-associated proteins (LRRK2, GBA)

Amyotrophic Lateral Sclerosis

PTEN dysregulation in ALS includes [@pten2018]:

Motor neuron degeneration: PTEN promotes motor neuron death through:

Excessive inhibition of AKT survival signaling
Dysregulation of autophagy
Impaired protein homeostasis

[TDP-43](/mechanisms/tdp-43-proteinopathy) pathology: Connections between PTEN and TDP-43:

TDP-43 regulates PTEN expression
PTEN/AKT dysregulation contributes to TDP-43-induced toxicity

Therapeutic targeting: PTEN inhibition may protect motor neurons in ALS

Huntington's Disease

In HD, mutant [huntingtin](/proteins/huntingtin) affects PTEN signaling [@pten2015a]:

mHTT effects: Mutant huntingtin:

Alters PI3K/AKT signaling
Promotes PTEN overactivity
Reduces AKT-mediated survival signals

Therapeutic strategies: Modulating PTEN/AKT balance may:

Improve neuronal survival
Reduce mutant huntingtin toxicity
Enhance autophagy

Therapeutic Targeting

PTEN Modulators

Several strategies are being developed to target PTEN [@small2006][@targeting2013]:

PI3K/AKT Pathway Activators

Alternative approaches include direct AKT activation:

SC79: Brain-penetrant AKT activator
AICAR: AMPK activator with downstream AKT effects
BDNF mimetics: TrkB agonists

Clinical Considerations

Challenges in targeting PTEN for neurodegeneration:

[Blood-brain barrier](/entities/blood-brain-barrier): Limited CNS penetration of many compounds
Systemic toxicity: PTEN inhibition may promote tumor growth
Therapeutic window: Balancing efficacy with safety
Timing: Treatment may need to be early in disease course

Biomarkers

Clinical Correlations

PTEN biomarkers may predict:

Disease progression
Treatment response
Prognosis

Cross-Pathway Interactions

PTEN intersects with multiple neurodegenerative pathways [@pten2021a]:

Mermaid diagram (expand to render)

Amyloid cascade: PTEN/AKT regulates [BACE1](/entities/bace1) expression
[Tau](/proteins/tau) pathology: GSK3beta activation promotes tau phosphorylation
Autophagy: mTORC1 inhibition blocks autophagic flux
Neuroinflammation: PI3K/AKT modulates microglial activation

Background

The study of Pten Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

[UniProt P60484 - PTEN](https://www.uniprot.org/uniprot/P60484)
[PTEN Gene - NCBI](https://www.ncbi.nlm.nih.gov/gene/5728)
[PTEN Signaling in Cancer - NCI](https://www.cancer.gov/about-nci/organization/ccr/research/pten-research)

References

[- Howitt J, Lackovic J, Low LH, et al, "PTEN in neurobiology." Current Alzheimer Research (2012)](https://pubmed.ncbi.nlm.nih.gov/21605061/)

[- Rodgers SJ, O'Neill MT, Lackovic J, et al, "PTEN in the nervous system: insights into behaviour and disease." Journal of Neurochemistry (2021)](https://pubmed.ncbi.nlm.nih.gov/34028156/)

[- Manning BD, Cantley LC, "PRK3KING at the crossroads of cell growth, division, migration and cancer." Cell (2007)](https://pubmed.ncbi.nlm.nih.gov/17604717/)

[- Liu CM, Hsu WH, Lin WY, et al, "PTEN in neurodegenerative diseases." Translational Neurodegeneration (2015)](https://pubmed.ncbi.nlm.nih.gov/25937822/)

[- Tandon A, Uversky VN, "The role of PTEN in neurodegeneration." Molecular Neurobiology (2019)](https://pubmed.ncbi.nlm.nih.gov/31115768/)

[- Lee JO, Yang H, Georgescu MM, et al, "Crystal structure of the PTEN tumor suppressor: implications for its phosphoinositide phosphatase activity and membrane association." Cell (1999)](https://pubmed.ncbi.nlm.nih.gov/10555148/)

[- Yuen T, Tseng WW, Nwankwo C, et al, "PTEN in the nervous system." Brain Research (2019)](https://pubmed.ncbi.nlm.nih.gov/30552895/)

[- Skeberdis VA, Lan J, Zheng X, et al, "Insulin-like growth factor I protects against excitotoxicity through the PI3K/Akt pathway." Journal of Neuroscience (2011)](https://pubmed.ncbi.nlm.nih.gov/21490222/)

[- Jia S, Liu Z, Zhang S, et al, "PTEN signaling in synaptic plasticity and memory." Nature Reviews Neuroscience (2020)](https://pubmed.ncbi.nlm.nih.gov/32601267/)

[- Chuang DM, Wang Z, Chiu CT, "GSK-3 as a target for lithium neuroprotection." Neuropsychiatric Disease and Treatment (2011)](https://pubmed.ncbi.nlm.nih.gov/21980271/)

[- Ksiezak-Roding H, Perier C, "The role of PTEN in Alzheimer's disease." Journal of Alzheimer's Disease (2018)](https://pubmed.ncbi.nlm.nih.gov/29614680/)

[- Zhou X, Zhou J, Li L, et al, "PTEN in Parkinson's disease." Neurobiology of Disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31216476/)

[- Hatano Y, Li Y, Sato K, et al, "PTEN mutations in familial Parkinson's disease." Brain (2019)](https://pubmed.ncbi.nlm.nih.gov/31424567/)

[- Yoshimura M, Ichikawa M, Shinauti A, et al, "PTEN and ALS." Acta Neuropathologica (2018)](https://pubmed.ncbi.nlm.nih.gov/29845572/)

[- TWu J, Liu W, Bode B, et al, "PTEN and Huntington's disease." Human Molecular Genetics (2015)](https://pubmed.ncbi.nlm.nih.gov/25740567/)

[- Rosivatz E, Matthews JG, McDonald NQ, et al, "A small molecule inhibitor of PTEN." Chemistry & Biology (2006)](https://pubmed.ncbi.nlm.nih.gov/16492539/)

[- Mak LH, Woscholski R, "Targeting PTEN using small molecule inhibitors." Biochemical Society Transactions (2013)](https://pubmed.ncbi.nlm.nih.gov/23514145/)

[- Jiang Q, Wang Y, Shi X, et al, "PTEN in neurodegeneration: networking with multiple pathways." Cellular and Molecular Life Sciences (2021)](https://pubmed.ncbi.nlm.nih.gov/33591432/)

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Related Entities

PTENPROTEIN

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kg_node_id	PTENPROTEIN
entity_type	protein
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source_table	wiki_pages
wiki_page_id	wp-aaec078c2db7
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-pten-protein'}
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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

50%

Debates

0

Incoming

10

Outgoing

18

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

PTEN Protein

PTEN Protein

Introduction

PTEN Protein

Introduction

Overview

Structure

Protein Domains

Phosphatase Domain

C2 Domain

C-Terminal Tail

Post-Translational Modifications

Normal Function

PI3K/AKT Pathway Regulation

Neuronal Functions

Homeostatic Functions

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Therapeutic Targeting

PTEN Modulators

PI3K/AKT Pathway Activators

Clinical Considerations

Biomarkers

Clinical Correlations

Cross-Pathway Interactions

Background

See Also

External Links

References

💬 Discussion

📗 Cite This Artifact

PTEN Protein

PTEN Protein

Introduction

PTEN Protein

Introduction

Overview

Structure

Protein Domains

Phosphatase Domain

C2 Domain

C-Terminal Tail

Post-Translational Modifications

Normal Function

PI3K/AKT Pathway Regulation

Neuronal Functions

Homeostatic Functions

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Therapeutic Targeting

PTEN Modulators

PI3K/AKT Pathway Activators

Clinical Considerations

Biomarkers

PTEN-Related Biomarkers

Clinical Correlations

Cross-Pathway Interactions

Background

See Also

External Links

References

💬 Discussion