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相关概念视频

The Contractile Ring02:15

The Contractile Ring

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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
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The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
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Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
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Cell Motility through Blebbing01:16

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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
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Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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相关实验视频

Updated: Sep 11, 2025

Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
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Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

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髓团动力学决定了上皮质伤口环收缩.

Alka Bhat1,2,3,4,5, Rémi Berthoz1,2,3,4,5, Simon Lo Vecchio1,2,3,4,5

  • 1Laboratory of Cell Physics ISIS/IGBMC, CNRS and University of Strasbourg, Strasbourg, France.

iScience
|August 13, 2025
PubMed
概括

在细胞和组织中,肌氨酸和动氨酸集群自组装. 它们在单细胞和多细胞系统中保存的动力学提供了对形态发生和伤口愈合的见解.

关键词:
细胞生物学 细胞生物学细胞生物学的组织方面.

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Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica
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Analysis of Actomyosin Dynamics at Local Cellular and Tissue Scales Using Time-lapse Movies of Cultured Drosophila Egg Chambers
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相关实验视频

Last Updated: Sep 11, 2025

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Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica
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Analysis of Actomyosin Dynamics at Local Cellular and Tissue Scales Using Time-lapse Movies of Cultured Drosophila Egg Chambers
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Analysis of Actomyosin Dynamics at Local Cellular and Tissue Scales Using Time-lapse Movies of Cultured Drosophila Egg Chambers

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科学领域:

  • 细胞生物学 细胞生物学
  • 生物物理学的生物物理.
  • 发展生物学 发展生物学

背景情况:

  • 氨酸-动氨酸集群自组装成由RhoA.调节的亚微米结构.
  • 这些群体在各种形态遗传系统中表现出新兴的动态,包括Drosophila和体外actomyosin试验.
  • 在单细胞系统中,集群动力学会在细胞动力学过程中影响压力产生 (辐射) 和传输 (接触).

研究的目的:

  • 为了研究在上皮质伤口关闭过程中多细胞环中的actomyosin集群的动态.
  • 在多细胞系统中将集群动态与RhoA活动相关联.
  • 为了确定actomyosin集群动态是否在单细胞和多细胞系统中保持.

主要方法:

  • 使用FRET传感器来评估上单层的RhoA活性,这些单层正在进行伤口关闭.
  • 观察并分析了多细胞环中的actomyosin集群的动态.
  • 将多细胞系统中的集群动态与单细胞系统中已知的动态进行比较.

主要成果:

  • 在伤口关闭期间,多细胞环中的actomyosin集群动力学与单细胞系统中的动力学相似.
  • 发现集群动态与RhoA活动无关.
  • 观察到,RhoA激活的突发会在肌肉素招募之前发生.

结论:

  • 在单细胞和多细胞系统之间,actomyosin集群动力学是保留的.
  • 这些保存的动力学表明,肌蛋白可以作为压力产生和形状变化在形态发生过程中的通用指标.
  • 了解这些动态可以帮助预测和绘制形态遗传过程,如伤口愈合.