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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).
In F-actin, the ADF/cofilin proteins...
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Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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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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Actin Polymerization01:42

Actin Polymerization

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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...
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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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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....
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Compact Quantum Dots for Single-molecule Imaging
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CdSe/ZnS Quantum Dots' Impact on In Vitro Actin Dynamics.

Abhishu Chand1, Nhi Le1, Kyoungtae Kim1

  • 1Department of Biology, Missouri State University, 901 S National, Springfield, MO 65897, USA.

International Journal of Molecular Sciences
|April 27, 2024
PubMed
Summary

Quantum dots (QDs) exhibit biphasic effects on actin dynamics, stimulating polymerization at low concentrations and inhibiting it at high concentrations. This study reveals a novel mechanism for QD toxicity by disrupting cellular actin processes.

Keywords:
actin cytoskeletonactin dynamicsdirect interactionquantum dotsquantum dots toxicity

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Area of Science:

  • Nanotechnology
  • Cell Biology
  • Biochemistry

Background:

  • Quantum dots (QDs) are advanced nanomaterials with unique optical and physical properties, leading to widespread interest in biomedical and industrial applications.
  • Despite their potential, concerns regarding the toxicity of quantum dots (QDs) hinder their broad adoption.
  • The precise mechanisms underlying QDs' cellular toxicity remain incompletely understood.

Purpose of the Study:

  • To investigate the adverse effects of quantum dots (QDs) on cellular processes.
  • To elucidate the mechanism of QD toxicity by focusing on actin polymerization and depolymerization dynamics.

Main Methods:

  • Studied the impact of varying quantum dot (QD) concentrations on actin polymerization and depolymerization.
  • Investigated the interaction between QDs and filamentous actin (F-actin).

Main Results:

  • Quantum dots (QDs) demonstrated a biphasic effect on actin polymerization: stimulation at low concentrations and inhibition at high concentrations.
  • QDs were found to bind to filamentous actin (F-actin), inducing filament bundling.
  • Quantum dots (QDs) were observed to promote actin depolymerization.

Conclusions:

  • A novel mechanism for quantum dot (QD) toxicity has been identified, involving the disruption of cellular actin dynamics.
  • Understanding QD interactions with the actin cytoskeleton is crucial for assessing and mitigating their potential toxicity in various applications.