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Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Mechanism of Lamellipodia Formation01:31

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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...
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Generation of Straight or Branched Actin Filaments01:14

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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...
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Cell Polarization by Rho Proteins01:21

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Mechanism of Filopodia Formation01:39

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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.
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Small GTPases - Ras and Rho01:24

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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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Related Experiment Video

Updated: Aug 15, 2025

Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag
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Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag

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LRRK2 decreases microglial actin dynamics by filamentous actin depolymerization and Rac1 inhibition.

Beomsue Kim1, Young Ho Suh2, Eunhye Joe3,4,5

  • 1Neural Circuit Research Group, Korea Brain Research Institute, Daegu, Republic of Korea.

Animal Cells and Systems
|January 6, 2023
PubMed
Summary

Parkinson

Keywords:
Actin depolymerizationF-actin-binding proteinsLeucine-rich repeat serine-threonine protein kinase-2Parkinson disease 8microglia

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • Microglia, the brain's immune cells, rely on dynamic actin cytoskeletons for their functions.
  • Dysregulated actin dynamics in microglia are implicated in neurodegenerative diseases like Parkinson's disease.

Purpose of the Study:

  • To investigate the role of Leucine-Rich Repeat Kinase 2 (LRRK2) in regulating microglia actin dynamics.
  • To understand how LRRK2 influences microglia's physiological activities, particularly migration.

Main Methods:

  • Utilized cell-based assays to observe actin polymerization and depolymerization.
  • Employed knockdown techniques to study the effects of LRRK2 deficiency.
  • Analyzed changes in microglial morphology, including ruffles and lamellipodia formation.
  • Assessed microglial migration towards damaged cells.

Main Results:

  • LRRK2 was identified as a negative regulator of microglia actin dynamics.
  • LRRK2 directly binds to filamentous actin (F-actin) and inhibits the Rac-PAK signaling pathway.
  • LRRK2 knockdown led to decreased membrane ruffling and increased lamellipodia formation.
  • Depletion of LRRK2 enhanced microglia migration towards damaged cells.

Conclusions:

  • LRRK2 plays a critical role in controlling actin dynamics within microglia.
  • LRRK2's regulation of actin dynamics influences microglial migration and potentially their role in brain homeostasis.
  • These findings offer insights into LRRK2's function in the context of Parkinson's disease and neuroinflammation.