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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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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
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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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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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.
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Actin Filament Depolymerization01:19

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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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Cortical Actin Flow in T Cells Quantified by Spatio-temporal Image Correlation Spectroscopy of Structured Illumination Microscopy Data
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Los flujos de actina median un acoplamiento universal entre la velocidad celular y la persistencia celular.

Paolo Maiuri1, Jean-François Rupprecht2, Stefan Wieser3

  • 1Institut Curie, CNRS UMR 144, 26 rue d'Ulm, 75005 Paris, France.

Cell
|March 24, 2015
PubMed
Resumen
Este resumen es generado por máquina.

La velocidad y la persistencia de la migración celular siguen una ley universal, impulsada por la dinámica del citoesqueleto de actina. Este hallazgo explica diversos patrones de movimiento celular observados en los procesos biológicos.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • La biofísica es la biofísica.
  • Mecanobiología Mecanobiología.

Sus antecedentes:

  • El movimiento celular es crucial para el desarrollo, la inmunidad y el cáncer.
  • La investigación existente muestra patrones variados de migración celular sin un principio unificador.

Objetivo del estudio:

  • Establecer una ley general que regule la migración celular.
  • Para investigar la relación entre la velocidad de la célula y la rectitud de la trayectoria (persistencia).
  • Para aclarar los mecanismos biofísicos subyacentes de la motilidad celular.

Principales métodos:

  • Recopilación de datos experimentales in vitro e in vivo.
  • Desarrollo y validación de un modelo teórico para la migración celular.
  • Modulación de las velocidades de flujo de actina y manipulación optogenética de los reguladores de actina.

Principales resultados:

  • Se identificó un robusto acoplamiento entre la velocidad de migración celular y la persistencia.
  • La ley propuesta está vinculada a la advección de señales de polaridad por los flujos del citoesqueleto de actina.
  • Se generó un diagrama de fase de las trayectorias celulares, explicando varios patrones de migración observados.

Conclusiones:

  • El acoplamiento velocidad-persistencia representa una ley genérica de la migración celular.
  • La dinámica del citoesqueleto de la actina es fundamental para la regulación de la motilidad celular.
  • El modelo teórico predice y explica con precisión diversos comportamientos de migración celular.