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.
Protein Name
Cofilin-1 (CFL1)
Subcellular Localization
Cytoplasm, Nucleus, Growth Cones, Synapses
Protein Family
ADF/cofilin family
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 1. Dysregulation of cofilin-1 activity is implicated in several neurodegenerative diseases including Alzheimer's Disease, Parkinson's Disease, and Amyotrophic Lateral Sclerosis.
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 2:
- 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
Cofilin-1 is a key regulator of actin cytoskeleton dynamics 3:
- Actin filament severing: Cuts actin filaments to create new barbed ends for polymerization
- Actin depolymerization: Promotes disassembly of aged filaments at pointed ends
- Filament turnover: Essential for rapid actin cytoskeleton remodeling in migrating cells
- Neuronal function: Critical for dendritic spine morphology and synaptic plasticity 4
- Cell migration: Regulates lamellipodia and filopodia formation through actin dynamics
- Nuclear functions: Affects gene expression through chromatin remodeling
Cofilin-1 activity is tightly regulated by multiple mechanisms:
- Phosphorylation by LIMK1 and LIMK2 (inactivates) 5
- Dephosphorylation by slingshot phosphatases (activates)
- PIP2 binding (inhibits membrane association)
- Oxidative modification (can alter activity in response to cellular stress)
Cofilin-1 is implicated in several neurodegenerative diseases 6:
| Disease |
Role of Cofilin-1 |
| [Alzheimer's Disease](/diseases/alzheimers) |
Dysregulated actin dynamics; cofilin rods in dendrites; impaired spine plasticity |
| [Parkinson's Disease](/diseases/parkinsons) |
Altered synaptic actin; mitochondrial trafficking defects; Lewy body involvement |
| [ALS](/diseases/als) |
Aggregates in motor neurons; axonal transport defects; cytoskeletal dysfunction |
"Cofilin rods" — actin-cofilin bundles — form in dendrites in response to Amyloid-beta toxicity and neuronal stress 7. These rods:
- Impair synaptic function and structure
- Contribute to memory deficits
- May be early markers of synaptic dysfunction
Cofilin-1 dysfunction affects:
- Alpha-synuclein aggregation dynamics
- Mitochondrial transport along actin filaments
- Dopaminergic neuron survival
Cofilin is sequestered into aggregates in motor neurons containing mutant SOD1, FUS, and TDP-43, contributing to cytoskeletal dysfunction and axonal degeneration 8.
| 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 |
- Bamburg JR, et al. (2010). "ADF/cofilin-actin rods in neurodegenerative diseases." Cold Spring Harb Perspect Biol 2: a011056. PMID:20452963(https://pubmed.ncbi.nlm.nih.gov/20452963/)
- Maloney MT, et al. (2009). "Amyloid-beta-induced neuronal dysfunction." J Neurosci 29: 9094-9106. PMID:19605642(https://pubmed.ncbi.nlm.nih.gov/19605642/)
- Liu CM, et al. (2016). "Cofilin dysfunction in ALS." Acta Neuropathol Commun 4: 79. PMID:27230449(https://pubmed.ncbi.nlm.nih.gov/27230449/)
- McGough A, et al. (1997). "Cofilin changes the twist of F-actin." J Cell Biol 138: 771-781.
- Bernstein BW, et al. (2006). "Formation of actin-ADF/cofilin rods." J Biol Chem 281: 23227-23238.
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.
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- 1 Bernstein & Bamburg (2010) Actin dynamics in disease. J Cell Biol 189:541-556.
- 2 UniProt P23528 - Cofilin-1 Human
- 3 Pollard & Wu (2010) Understanding the actin cytoskeleton. Cell 142:730-744.
- 4 Hotulainen & Lappalainen (2006) Actin stress fibers. J Cell Biol 173:383-394.
- 5 Arber et al. (1998) Regulation of actin dynamics by LIM kinases. Nature 394:789-793.
- 6 Bamburg et al. (2010) ADF/cofilin-actin rods. Cold Spring Harb Perspect Biol 2:a011056.
- 7 Maloney et al. (2009) Amyloid-beta-induced cofilin rods. J Neurosci 29:9094-9106.
- 8 Liu et al. (2016) Cofilin dysfunction in ALS. Acta Neuropathol Commun 4:79.
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