Cofilin-1 — Actin-Depolymerizing Factor

Cofilin-1 — Actin-Depolymerizing Factor

Introduction

Cofilin 1 — Actin Depolymerizing Factor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Cofilin-1 — Actin-Depolymerizing Factor

Introduction

Cofilin 1 — Actin Depolymerizing Factor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein"> [@bernstein2010]
<div class="infobox-header">Cofilin-1 Protein</div> [@uniprot]
<div class="infobox-row"> [@pollard2010]
<div class="infobox-label">Protein Name</div> [@hotulainen2006]
<div class="infobox-value">Cofilin-1 (CFL1)</div> [@regulation1998]
</div> [@adfcofilinactin2010]
<div class="infobox-row"> [@amyloidbetainduced2009]
<div class="infobox-label">Gene</div> [@cofilin2016]
<div class="infobox-value">[CFL1](/genes/cfl1)</div> [@referencesa]
</div>
<div class="infobox-row">
<div class="infobox-label">UniProt ID</div>
<div class="infobox-value"><a href="https://www.uniprot.org/uniprot/P23528" target="_blank">P23528</a></div>
</div>
<div class="infobox-row">
<div class="infobox-label">Molecular Weight</div>
<div class="infobox-value">~19 kDa</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Subcellular Localization</div>
<div class="infobox-value">Cytoplasm, Nucleus, Growth Cones, Synapses</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Protein Family</div>
<div class="infobox-value">ADF/cofilin family</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Associated Diseases</div>
<div class="infobox-value">[Alzheimer's Disease](/diseases/alzheimers), [Parkinson's Disease](/diseases/parkinsons-disease), [Amyotrophic Lateral Sclerosis](/diseases/als)</div>
</div>
</div>

Overview

Cofilin-1 (CFL1) is a critical actin-binding protein belonging to the ADF (Actin-Depolymerizing Factor) family. It plays essential roles in regulating actin cytoskeleton dynamics, which is fundamental to neuronal function, synaptic plasticity, and intracellular transport [@references]. Dysregulation of cofilin-1 activity is implicated in several neurodegenerative diseases including [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease-disease), and [Amyotrophic Lateral Sclerosis](/diseases/als).

Structure

Cofilin-1 is a 19 kDa actin-binding protein with a characteristic ADF-H (actin-depolymerizing factor homology) domain. The protein possesses several key structural features [@bernstein2010]:

• Actin-binding interface: Binds to both G-actin (globular) and F-actin (filamentous) forms
• Phosphoinositide-binding site: Enables membrane localization and regulation by phosphoinositides
• Nuclear localization signal (NLS): Allows translocation to the nucleus
• Phosphorylation site: Ser3 phosphorylation regulates activity

Normal Function

Cofilin-1 is a key regulator of actin cytoskeleton dynamics [@uniprot]:

Regulation of Cofilin-1 Activity

Cofilin-1 activity is tightly regulated by multiple mechanisms:

• Phosphorylation by LIMK1 and LIMK2 (inactivates) [@hotulainen2006]
• Dephosphorylation by slingshot phosphatases (activates)
• PIP2 binding (inhibits membrane association)
• Oxidative modification (can alter activity in response to cellular stress)

Role in Disease

Cofilin-1 is implicated in several neurodegenerative diseases [@regulation1998]:

| Disease | Role of Cofilin-1 |
|---------|-------------------|
| [Alzheimer's Disease\](/diseases/alzheimers-disease) | Dysregulated actin dynamics; cofilin rods in dendrites; impaired spine plasticity |
| [Parkinson's Disease\](/diseases/parkinsons-disease) | Altered synaptic actin; mitochondrial trafficking defects; Lewy body involvement |
| [ALS\](/diseases/als) | Aggregates in motor [neurons](/entities/neurons); axonal transport defects; cytoskeletal dysfunction |

Alzheimer's Disease

"Cofilin rods" — actin-cofilin bundles — form in dendrites in response to [Amyloid-beta](/proteins/amyloid-beta) toxicity and neuronal stress [@adfcofilinactin2010]. These rods:

• Impair synaptic function and structure
• Contribute to memory deficits
• May be early markers of synaptic dysfunction

Parkinson's Disease

Cofilin-1 dysfunction affects:

• [Alpha-synuclein](/proteins/alpha-synuclein) aggregation dynamics
• Mitochondrial transport along actin filaments
• Dopaminergic neuron survival

ALS

Cofilin is sequestered into aggregates in motor neurons containing mutant [SOD1](/proteins/sod1-protein), [FUS](/proteins/fus-protein), and [TDP-43](/proteins/tdp-43), contributing to cytoskeletal dysfunction and axonal degeneration [@amyloidbetainduced2009].

Therapeutic Targeting

| Strategy | Approach | Status |
|----------|----------|--------|
| LIM kinase inhibitors | Prevent cofilin inactivation | Preclinical |
| Actin stabilizers | Promote proper actin dynamics | Research |
| Antioxidants | Prevent oxidative inactivation of cofilin | Various stages |
| Gene therapy | Modulate CFL1 expression | Experimental |

Key Publications

Cross-Links

• [CFL1 Gene](/proteins/cfl1-protein) - Gene encoding this protein
• [Actin](/dctn1-) - Target of cofilin activity
• [LIMK1](/genes/limk1) - Kinase that phosphorylates cofilin
• [LIMK2](/genes/limk2) - Kinase that phosphorylates cofilin
• [Alpha-synuclein](/proteins/alpha-synuclein) - Parkinson's disease protein
• [SOD1](/proteins/sod1-protein) - ALS protein
• [TDP-43](/proteins/tdp-43) - ALS protein
• [Alzheimer's Disease](/diseases/alzheimers-disease) - Related disease
• [Parkinson's Disease](/diseases/parkinsons-disease-disease) - Related disease
• [Amyotrophic Lateral Sclerosis](/diseases/als) - Related disease

See Also

• [Cytoskeleton Dysfunction](/mechanisms/cytoskeleton-dysfunction)
• [Synaptic Plasticity](/mechanisms/synaptic-plasticity-deficits)
• [Actin Dynamics](/mechanisms/actin-dynamics)
• [Axonal Transport](/mechanisms/axonal-transport)

Background

The study of Cofilin 1 — Actin Depolymerizing Factor 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

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

Pathway Diagram

The following diagram shows the key molecular relationships involving Cofilin-1 — Actin-Depolymerizing Factor discovered through SciDEX knowledge graph analysis: