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Related Concept Videos

Actin Treadmilling01:18

Actin Treadmilling

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Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
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Primary Healthcare Services01:30

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Primary care promotes wellness and prevents disease. This care includes health promotion, education, protection (such as immunizations), early disease screening, and environmental considerations. Settings providing this type of healthcare include physician offices, public health clinics, school nursing, and community health nursing.
In 1978, international leaders convened in Alma-Ata, Kazakhstan, for what would be a pivotal event in global health. The Alma-Ata Declaration was the first to call...
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Preventive healthcare services keep people healthy via frequent check-ups, screening, and counseling. They primarily aid in disease prevention rather than treating an acute or chronic illness. Preventive treatment also keeps individuals productive and energetic, allowing them to work well into their retirement years. Examples of preventive care services include:
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Introduction to Actin01:26

Introduction to Actin

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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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 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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Related Experiment Video

Updated: Feb 5, 2026

Quantification of Filamentous Actin F-actin Puncta in Rat Cortical Neurons
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Quantification of Filamentous Actin F-actin Puncta in Rat Cortical Neurons

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Dendritic actin delivery service.

Yun-Jin Pai1, Adrian W Moore2

  • 1Neurodiversity, RIKEN Center for Brain Science, Wako, Saitama, Japan.

The Journal of Cell Biology
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

Researchers discovered actin blobs, which are new structures that help deliver actin to growing dendrites and indicate where new branches will form, advancing our understanding of the actin cytoskeleton.

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Quantification of Filamentous Actin F-actin Puncta in Rat Cortical Neurons
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Area of Science:

  • Cell Biology
  • Neuroscience
  • Cytoskeleton Dynamics

Background:

  • The actin cytoskeleton plays a crucial role in neuronal development, particularly in shaping dendritic arbors.
  • The precise mechanisms by which actin dynamics regulate dendritic branching remain incompletely understood.

Purpose of the Study:

  • To investigate novel structures involved in actin delivery to developing dendrites.
  • To elucidate the role of these structures in the regulation of dendritic branching patterns.

Main Methods:

  • Live imaging of neuronal cultures.
  • High-resolution microscopy to visualize cytoskeletal dynamics.
  • Actin labeling techniques.

Main Results:

  • Identification of "actin blobs," dynamic structures within growing dendrites.
  • Actin blobs mediate the transport of actin to distal dendritic regions.
  • Actin blobs correlate with and predict sites of future dendritic branch formation.

Conclusions:

  • Actin blobs represent a novel mechanism for dynamic actin delivery during dendrite growth.
  • These structures are key regulators of dendritic arbor architecture.
  • The findings provide new insights into the molecular basis of neuronal morphogenesis.