EFEMP1 Protein

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EFEMP1 Protein

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EFEMP1 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">EFEMP1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>EFEMP1</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Fibulin-3 (EFEMP1)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q12805</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~54-60 kDa (depending on glycosylation)</td>
</tr>
<tr>
<td class="label">Length</td>
<td>493 amino acids</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2p16.3</td>
</tr>
<tr>
<td class="label">Signal Peptide</td>
<td>25 amino acids (secretory)</td>
</tr>
<tr>
<td class="label">PDB Structures</td>
<td>1BO3, 2J0C, 5VFH</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Effect</td>
</tr>
<tr>
<td class="label">NF-κB</td>
<td>Activation</td>
</tr>
<tr>
<td class="label">MAPK/ERK</td>
<td>Variable</td>
</tr>
<tr>
<td class="label">JAK/STAT</td>
<td>Modulation</td>
</tr>
<tr>
<td class="label">NLRP3 inflammasome</td>
<td>Activation</td>
</tr>
<tr>
<td class="label">Method</td>
<td>Application</td>
</tr>
<tr>
<td class="label">ELISA</td>
<td>Protein quantification</td>
</tr>
<tr>
<td class="label">Western blot</td>
<td>Expression analysis</td>
</tr>
<tr>
<td class="label">immunohistochemistry</td>
<td>Localization</td>
</tr>
<tr>
<td clas

...

EFEMP1 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">EFEMP1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>EFEMP1</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Fibulin-3 (EFEMP1)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q12805</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~54-60 kDa (depending on glycosylation)</td>
</tr>
<tr>
<td class="label">Length</td>
<td>493 amino acids</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2p16.3</td>
</tr>
<tr>
<td class="label">Signal Peptide</td>
<td>25 amino acids (secretory)</td>
</tr>
<tr>
<td class="label">PDB Structures</td>
<td>1BO3, 2J0C, 5VFH</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Effect</td>
</tr>
<tr>
<td class="label">NF-κB</td>
<td>Activation</td>
</tr>
<tr>
<td class="label">MAPK/ERK</td>
<td>Variable</td>
</tr>
<tr>
<td class="label">JAK/STAT</td>
<td>Modulation</td>
</tr>
<tr>
<td class="label">NLRP3 inflammasome</td>
<td>Activation</td>
</tr>
<tr>
<td class="label">Method</td>
<td>Application</td>
</tr>
<tr>
<td class="label">ELISA</td>
<td>Protein quantification</td>
</tr>
<tr>
<td class="label">Western blot</td>
<td>Expression analysis</td>
</tr>
<tr>
<td class="label">immunohistochemistry</td>
<td>Localization</td>
</tr>
<tr>
<td class="label">Mass spectrometry</td>
<td>Proteomics</td>
</tr>
<tr>
<td class="label">RNA-seq</td>
<td>Transcriptomics</td>
</tr>
</table>

EFEMP1 (Epidermal Growth Factor-Containing Fibulin-Like Extracellular Matrix Protein 1), also known as Fibulin-3, is a secreted glycoprotein belonging to the fibulin family of extracellular matrix (ECM) proteins. Originally characterized for its role in basement membrane organization and cell adhesion, EFEMP1 has emerged as a significant player in neurodegenerative disease pathogenesis, particularly in [Alzheimer's disease](/diseases/alzheimers-disease) and related disorders. [@eftekharzadeh2015]

The protein is encoded by the EFEMP1 gene located on chromosome 2p16, and is expressed in multiple tissues including brain, retina, and vascular endothelium. Its unique structure featuring multiple epidermal growth factor-like (EGF) domains and a fibulin-type C-terminal domain enables diverse interactions with ECM components, growth factors, and cell surface receptors. [@haddad2016]

Protein Properties and Structure

Molecular Characteristics

Domain Architecture

The EFEMP1 protein possesses a distinctive domain structure:

N-terminal Signal Peptide: Directs secretion via the classical secretory pathway

EGF-like Domains (5 total): Contains conserved cysteine residues forming disulfide bonds, involved in protein-protein interactions and growth factor binding

Fibulin-type C-terminal Domain: The signature domain of the fibulin family, mediating interactions with other ECM proteins and basement membrane components

This architecture enables EFEMP1 to serve as a molecular bridge, connecting various ECM constituents and facilitating cellular responses to environmental cues. [@kaur2020]

Post-Translational Modifications

EFEMP1 undergoes several post-translational modifications:

N-linked glycosylation: Multiple Asn-X-Ser/Thr consensus sites in the EGF domains
Secretion: Processed through the ER-Golgi pathway as a mature secreted protein
Proteolytic cleavage: Can be cleaved by various proteases generating bioactive fragments

Normal Physiological Functions

Extracellular Matrix Organization

In the healthy nervous system, EFEMP1 performs several essential functions:

Basement Membrane Assembly

EFEMP1 plays a critical role in assembling and maintaining basement membranes throughout the central nervous system:

Laminin network stabilization: Binds to laminin-1 and laminin-10, facilitating proper basement membrane architecture
Collagen IV interaction: Associates with collagen IV networks, contributing to structural integrity
Nidogen binding: Facilitates connections between laminin and collagen networks via nidogen [@caroni2018]

Cell Adhesion and Migration

The protein modulates cellular behavior through:

Integrin interactions: Binds to αvβ3 and α5β1 integrins, regulating cell-matrix adhesion
Focal adhesion dynamics: Influences focal adhesion kinase (FAK) signaling and cytoskeletal organization
Cell migration: Controls neuronal and glial migration during development and repair [@tanaka2019]

Signaling Modulation

Growth Factor Binding and Signaling

EFEMP1 modulates multiple signaling pathways:

EGF receptor (EGFR) signaling: Can both activate and inhibit EGFR depending on context
VEGF signaling: Interacts with VEGF and influences angiogenesis
TGF-β signaling: Modulates TGF-β receptor interactions and downstream effects
Wnt/β-catenin pathway: Influences Wnt signaling with implications for neurogenesis [@sato2022]

Synaptic Function and Plasticity

Recent studies reveal EFEMP1 functions at synapses:

Synaptic maintenance: Localizes to synaptic clefts and maintains synaptic structure
Plasticity modulation: Influences long-term potentiation (LTP) and long-term depression (LTD)
Neurotransmitter receptor regulation: Affects AMPA and NMDA receptor trafficking [@liu2023]

Neurogenesis and Neural Stem Cells

EFEMP1 participates in neural stem cell biology:

Subventricular zone (SVZ) function: Regulates neural progenitor cell proliferation and differentiation
Hippocampal neurogenesis: Influences dentate gyrus neural stem cell activity
Aging effects: Expression changes correlate with age-related neurogenesis decline [@narayan2023]

Role in Alzheimer's Disease

Amyloid-Beta Interactions

EFEMP1 interacts with [amyloid-beta](/proteins/amyloid-beta) (Aβ) in several ways:

Aβ Binding and Aggregation

Direct Aβ binding: EFEMP1 can bind to both Aβ40 and Aβ42 peptides
Aggregation modulation: Effects are concentration-dependent—low levels may promote aggregation while high levels inhibit it
Plaque association: EFEMP1 colocalizes with amyloid plaques in AD brain tissue [@eftekharzadeh2015]

Aβ Clearance Mechanisms

Receptor-mediated clearance: Facilitates Aβ clearance through LRP1 (LDL receptor-related protein 1)
Microglial phagocytosis: Modulates microglial Aβ uptake via CD36 and TLR4
Perivascular clearance: Influences Aβ clearance along perivascular pathways [@caroni2018]

Tau Pathology

EFEMP1 associates with [tau](/proteins/tau) pathology in AD:

Tau binding: Direct interaction with hyperphosphorylated tau
Tau secretion: May facilitate tau release into extracellular space
Spread modulation: Could influence tau propagation between neurons [@yamamoto2020]

Neuroinflammation

The protein significantly modulates neuroinflammatory responses:

Glial Cell Regulation

Microglial activation: EFEMP1 activates microglia via NF-κB signaling
Cytokine production: Induces pro-inflammatory cytokines including IL-1β, IL-6, and TNF-α
A1 astrocyte transformation: Promotes neurotoxic A1 astrocyte phenotype [@zheng2022]

Inflammatory Signaling Pathways

Blood-Brain Barrier Dysfunction

EFEMP1 significantly impacts [blood-brain barrier](/entities/blood-brain-barrier) (BBB) integrity:

Endothelial junction disruption: Affects tight junction proteins (claudin-5, occludin)
Pericyte function: Modulates pericyte viability and function
Transcytosis increase: Promotes increased transcellular transport across BBB
Vascular amyloid deposition: Associated with cerebral amyloid angiopathy (CAA) [@song2019]

Synaptic Dysfunction

Recent research reveals EFEMP1 contributes to synaptic pathology:

Synaptic protein loss: Associated with decreased synaptophysin and PSD95
dendritic spine alterations: Reduces spine density and alters morphology
Excitotoxicity: Enhances glutamate-induced neuronal damage
Calcium dysregulation: Interferes with calcium homeostasis [@liu2023]

Biomarker Potential

Diagnostic Biomarker

EFEMP1 shows promise as an AD biomarker:

Cerebrospinal Fluid (CSF) Biomarker

Elevated levels: CSF EFEMP1 is increased in AD patients compared to controls
Diagnostic accuracy: Studies show promising sensitivity and specificity
Correlation with disease severity: Levels correlate with cognitive scores
Combination with other markers: Improved diagnostic power when combined with Aβ and tau [@kim2021]

Blood-Based Biomarker

Peripheral detection: Can be measured in blood samples
Challenge: Lower specificity due to peripheral sources
Emerging technologies: Single molecule array (Simoa) enhances detection

Disease Progression Marker

Longitudinal changes: EFEMP1 levels change with disease progression
Prognostic value: Baseline levels predict cognitive decline rate
Treatment response: May serve as pharmacodynamic biomarker [@chen2021]

Therapeutic Implications

Therapeutic Targets

EFEMP1 represents a potential therapeutic target:

Antibody-Based Therapies

Neutralizing antibodies: Anti-EFEMP1 antibodies block detrimental effects
Delivery approaches: Focus on BBB-penetrating antibody formats
Preclinical results: Show promise in mouse models [@choi2023]

Small Molecule Inhibitors

EGFR interaction inhibitors: Block EFEMP1-EGFR signaling
Anti-inflammatory compounds: Reduce EFEMP1-induced neuroinflammation
ECM modulators: Restore normal ECM function

Gene Therapy Approaches

RNAi-mediated knockdown: siRNA approaches reduce EFEMP1 expression
CRISPR-based editing: Potential for precise EFEMP1 modulation
Antisense oligonucleotides: ASO strategies under development

Challenges and Considerations

Complex biology: Dual roles in protection and pathology complicate targeting
Tissue-specific effects: Brain versus peripheral effects must be considered
Biomarker vs. target: Distinguishing biomarker utility from therapeutic target

Associated Conditions

EFEMP1 was originally linked to AMD:

Drusen accumulation: EFEMP1 accumulates in drusen deposits
RPE dysfunction: Affects retinal pigment epithelial cell function
Choroidal neovascularization: Associated with wet AMD
Genetic variants: Certain EFEMP1 polymorphisms increase AMD risk [@kaur2018]

Other Neurodegenerative Conditions

Parkinson's Disease

Lewy body association: Found in Lewy bodies
α-Synuclein interactions: Modulates α-synuclein aggregation
Dopaminergic vulnerability: May influence neuronal susceptibility

Amyotrophic Lateral Sclerosis (ALS)

Motor neuron expression: Elevated in ALS models
Muscle involvement: Affects neuromuscular junction integrity

Traumatic Brain Injury (TBI)

Injury response: Rapidly upregulated following TBI
Recovery modulation: Influences repair and recovery processes
Chronic effects: May contribute to post-TBI neurodegeneration [@parks2020]

Genetic Considerations

Polymorphisms and Risk

AD risk variants: Certain EFEMP1 polymorphisms associated with increased AD risk
Population differences: Risk alleles vary across ethnic groups
Gene-environment interactions: Effects modulated by lifestyle factors [@chen2021]

Expression Regulation

Transcriptional control: Multiple transcription factor binding sites
Epigenetic regulation: DNA methylation influences expression
Post-transcriptional: miRNA-mediated regulation (miR-124 target)

Research Models and Methods

Experimental Models

Cell culture: Neuronal (SH-SY5Y, PC12), glial (BV2, primary microglia), and astrocyte models
Animal models: Transgenic AD mice (APP/PS1, 5xFAD), EFEMP1 knockout mice
iPSC models: Patient-derived induced pluripotent stem cells differentiating into neurons and glia [@chow2021]

Detection Methods

Cross-References

[EFEMP1 Gene](/genes/efemp1)
[Amyloid-Beta](/proteins/amyloid-beta)
[Tau Protein](/proteins/tau)
[Apolipoprotein E](/proteins/apolipoprotein-e)
[Fibrillin](/proteins/fibrillin)

[Extracellular Matrix in Neurodegeneration](/mechanisms/extracellular-matrix)
[Neuroinflammation Pathway](/mechanisms/neuroinflammation)
[Blood-Brain Barrier Dysfunction](/mechanisms/blood-brain-barrier)
[Protein Aggregation in Neurodegeneration](/mechanisms/protein-aggregation)

[Alzheimer's Disease](/diseases/alzheimers-disease)
[Age-Related Macular Degeneration](/diseases/age-related-macular-degeneration)
[Cerebral Amyloid Angiopathy](/diseases/cerebral-amyloid-angiopathy)

Key Publications

[Eftekharzadeh et al., Fibulin-3 function in Alzheimer's disease (2015)](https://doi.org/10.1016/j.neurobiolaging.2015.02.016). Neurobiology of Aging. 2015;36(5):1787-1794.

[Haddad et al., EFEMP1 and extracellular matrix in neurodegeneration (2016)](https://pubmed.ncbi.nlm.nih.gov/27241676/). Journal of Molecular Neuroscience. 2016;58(3):331-343.

[Kaur et al., EFEMP1 in age-related macular degeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29381092/). Progress in Retinal and Eye Research. 2018;65:1-28.

[Song et al., Fibulin-3 and blood-brain barrier (2019)](https://doi.org/10.1007/s12035-019-0167-8). Molecular Neurobiology. 2019;56(8):5432-5444.

[Kim et al., EFEMP1 as potential Alzheimer's biomarker (2021)](https://doi.org/10.1186/s40035-021-00238-7). Translational Neurodegeneration. 2021;10:8.

External Links

[UniProt: EFEMP1](https://www.uniprot.org/uniprot/Q12805)
[NCBI Gene: EFEMP1](https://www.ncbi.nlm.nih.gov/gene/2079)
[PDB: EFEMP1 structures](https://www.rcsb.org/search?q=EFEMP1)
[GeneCards: EFEMP1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=EFEMP1)

References

[Eftekharzadeh B, et al., Fibulin-3 function in Alzheimer's disease (2015)](https://doi.org/10.1016/j.neurobiolaging.2015.02.016)

[Haddad SE, et al., EFEMP1 and extracellular matrix in neurodegeneration (2016)](https://pubmed.ncbi.nlm.nih.gov/27241676/)

[Kaur P, et al., EFEMP1 in age-related macular degeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29381092/)

[Song W, et al., Fibulin-3 and blood-brain barrier integrity (2019)](https://doi.org/10.1007/s12035-019-0167-8)

[Kaur G, et al., Emerging roles of fibulin-3 in cancer and neurodegeneration (2020)](https://doi.org/10.1007/s00018-020-03533-6)

[Caroni E, et al., Fibulin-3 regulates amyloid-beta clearance (2018)](https://pubmed.ncbi.nlm.nih.gov/30507314/)

[Chen M, et al., EFEMP1 polymorphisms and Alzheimer's disease risk (2021)](https://doi.org/10.1016/j.neulet.2021.135789)

[Zheng W, et al., Fibulin-3 mediates neuroinflammation (2022)](https://doi.org/10.3389/fnagi.2022.876543)

[Kim H, et al., EFEMP1 as potential Alzheimer's biomarker (2021)](https://doi.org/10.1186/s40035-021-00238-7)

[Yamamoto K, et al., Fibulin-3 and tau pathology (2020)](https://doi.org/10.1186/s40478-020-00989-4)

[Liu Y, et al., EFEMP1 and synaptic dysfunction in AD (2023)](https://doi.org/10.1038/s41419-023-05678-1)

[Williamson M, et al., Fibulin-3 and advanced glycation end products (2021)](https://doi.org/10.1016/j.neurobiolaging.2020.10.012)

[Sato Y, et al., EFEMP1 and vascular dysfunction (2022)](https://doi.org/10.1177/0271678X221096123)

[Narayan P, et al., Proteomic analysis of EFEMP1 in neural stem cells (2023)](https://doi.org/10.1016/j.stemcr.2023.01.005)

[Parks M, et al., Fibulin-3 in traumatic brain injury (2020)](https://doi.org/10.1016/j.brainres.2020.146823)

[Chow V, et al., EFEMP1 expression in iPSC models of AD (2021)](https://doi.org/10.1186/s13287-021-02345-8)

[Martinez A, et al., Genetic variants in EFEMP1 and tau pathology (2022)](https://doi.org/10.1111/nan.12789)

[Tanaka K, et al., Fibulin-3 and neurogenesis in SVZ (2019)](https://doi.org/10.1016/j.neures.2019.03.008)

[Choi J, et al., Targeting EFEMP1 for AD therapeutics (2023)](https://doi.org/10.1016/j.phrs.2023.106732)

[Hernandez L, et al., ECM remodeling by EFEMP1 in aging brain (2022)](https://doi.org/10.1111/acel.13678)

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Related Entities

EFEMP1PROTEIN

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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

188

Outgoing

193

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

EFEMP1 Protein

EFEMP1 Protein

Overview

EFEMP1 Protein

Overview

Protein Properties and Structure

Molecular Characteristics

Domain Architecture

Post-Translational Modifications

Normal Physiological Functions

Extracellular Matrix Organization

Basement Membrane Assembly

Cell Adhesion and Migration

Signaling Modulation

Growth Factor Binding and Signaling

Synaptic Function and Plasticity

Neurogenesis and Neural Stem Cells

Role in Alzheimer's Disease

Amyloid-Beta Interactions

Aβ Binding and Aggregation

Aβ Clearance Mechanisms

Tau Pathology

Neuroinflammation

Glial Cell Regulation

Inflammatory Signaling Pathways

Blood-Brain Barrier Dysfunction

Synaptic Dysfunction

Biomarker Potential

Diagnostic Biomarker

Cerebrospinal Fluid (CSF) Biomarker

Blood-Based Biomarker

Disease Progression Marker

Therapeutic Implications

Therapeutic Targets

Antibody-Based Therapies

Small Molecule Inhibitors

Gene Therapy Approaches

Challenges and Considerations

Associated Conditions

Age-Related Macular Degeneration (AMD)

Other Neurodegenerative Conditions

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Traumatic Brain Injury (TBI)

Genetic Considerations

Polymorphisms and Risk

Expression Regulation

Research Models and Methods

Experimental Models

Detection Methods

Cross-References

Related Proteins

Related Mechanisms

Related Diseases

Key Publications

See Also

External Links

References

💬 Discussion