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Videos de Conceptos Relacionados

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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...
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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...
Actin Polymerization and Cell Motility01:13

Actin 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.
Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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. 
Anchoring junctions mechanically attach a cell to the...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

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Video Experimental Relacionado

Updated: Jul 21, 2026

A Galvanotaxis Assay for Analysis of Neural Precursor Cell Migration Kinetics in an Externally Applied Direct Current Electric Field
11:00

A Galvanotaxis Assay for Analysis of Neural Precursor Cell Migration Kinetics in an Externally Applied Direct Current Electric Field

Published on: October 13, 2012

Cambios en la forma celular y la distribución de actina inducidos por campos eléctricos constantes.

P W Luther, H B Peng, J J Lin

    Nature
    |May 5, 1983
    PubMed
    Resumen

    Las células epiteliales cultivadas de Xenopus exhiben galvanotropismo, alargándose perpendicularmente a un campo eléctrico. Esta respuesta implica la retracción celular en el ánodo y la extensión de lamellipodia en el cátodo y los extremos celulares, con reorganización de actina.

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    Área de la Ciencia:

    • Biología celular Biología celular.
    • Electrofisiología y electrofisiología.
    • La biofísica es la biofísica.

    Sus antecedentes:

    • La motilidad celular implica la polarización de la forma, la extensión de la lámina y la alineación de las fibras de tensión.
    • Los campos eléctricos de corriente continua (DC) aplicados externamente pueden influir en la orientación celular, pero su efecto sobre la motilidad es en gran medida desconocido.

    Objetivo del estudio:

    • Para investigar la respuesta galvanotrópica de las células epiteliales de Xenopus cultivadas.
    • Comprender cómo los campos eléctricos afectan la forma celular, la motilidad y la organización citoesquelética.

    Principales métodos:

    • Cultivo de células epiteliales de Xenopus.
    • Aplicación de un campo eléctrico de corriente continua (DC) (5 V cm-1).
    • Observación microscópica de la morfología celular, la extensión de lamellipodia y la organización de las fibras de tensión.

    Principales resultados:

    • Células alargadas perpendicularmente a la dirección del campo eléctrico.
    • El lado anodal de la célula mostró retracción, mientras que el borde catodal y los extremos celulares se extendieron.
    • Las fibras de tensión se reorientaron perpendicularmente al campo, y la actina se localizó en las lámelas activas.

    Conclusiones:

    • Las células epiteliales de Xenopus muestran una clara respuesta galvanotrópica, alterando su orientación y motilidad en respuesta a los campos eléctricos.
    • Los campos eléctricos inducen cambios significativos en la polaridad celular, la organización citoesquelética y la dinámica de las interacciones célula-sustrato.