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Updated: May 14, 2026
06:54
A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
Published on: June 3, 2021
Activity-dependent spine morphogenesis: a role for the actin-capping protein Eps8
Eleanna Stamatakou1, Aude Marzo, Alasdair Gibb
1Department of Cell and Developmental Biology, University College London, London WC1E 6BT, United Kingdom.
Summary
Eps8, an actin-capping protein, is crucial for dendritic spine formation and synaptic plasticity. Its absence disrupts actin dynamics, impacting synapse structure and function during long-term potentiation.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Neuronal activity shapes dendritic spines via actin cytoskeleton remodeling.
- Molecular mechanisms governing spine formation and plasticity are not fully understood.
Purpose of the Study:
- Investigate the role of Eps8 in dendritic spine morphogenesis and synaptic plasticity.
- Elucidate the molecular function of Eps8 in regulating actin dynamics within neurons.
Main Methods:
- Utilized gain- and loss-of-function studies in rat hippocampal neurons.
- Employed free-barbed end and FRAP assays to analyze actin polymerization and turnover.
- Assessed synaptic structure, transmission, and plasticity, including long-term potentiation.
Main Results:
- Eps8 promotes dendritic spine formation while inhibiting filopodia.
- Eps8 loss-of-function leads to increased actin polymerization and rapid turnover in spines.
- Eps8 influences the distribution of excitatory synapses without altering total synapse number or basal transmission.
- Impaired structural and functional synaptic plasticity was observed upon Eps8 loss of function.
Conclusions:
- Eps8 is essential for regulating actin dynamics, spine morphogenesis, and synaptic plasticity.
- Eps8 plays a novel role in activity-dependent synaptic plasticity and neuronal structure.
Related Concept Videos
01:14Generation of Straight or Branched Actin Filaments
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
01:31Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
01:39Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
01:13Actin Polymerization and Cell Motility
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
01:42Actin Polymerization
Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶ nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
01:13Cytoskeletal Accessory Proteins
The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...