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Cell Migration01:09

Cell Migration

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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Immune Surveillance by NK Cells and Phagocytes01:25

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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
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Phagocytosis00:41

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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells,...
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Chemotaxis and Direction of Cell Migration01:21

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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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Phagocytosis of Apoptotic Cells01:17

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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Cell-mediated Immune Responses01:40

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Video Experimental Relacionado

Updated: Sep 9, 2025

"Phagosome Closure Assay" to Visualize Phagosome Formation in Three Dimensions Using Total Internal Reflection Fluorescent Microscopy TIRFM
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"Phagosome Closure Assay" to Visualize Phagosome Formation in Three Dimensions Using Total Internal Reflection Fluorescent Microscopy TIRFM

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El confinamiento físico y la absorción fagocítica inducen una migración celular persistente.

Summer G Paulson1,2, Sophia Liu1,2, Jeremy D Rotty1

  • 1Uniformed Services University of the Health Sciences, Department of Biochemistry, Bethesda, MD, 20814, USA.

Biology open
|September 1, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El confinamiento físico aumenta significativamente la fagocitosis en las células similares a la microglía BV2, actuando como un potente controlador. Este efecto implica el complejo Arp2/3 y la miosina II, que influyen en la migración celular y las respuestas inmunes.

Palabras clave:
Actina y sus derivadosComplejo Arp2/3Movilidad limitadaFibronectina y sus derivadosLas microglíasLa miosinaLa fagocitosis

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Área de la Ciencia:

  • Biología celular
  • Inmunología
  • La biofísica

Sus antecedentes:

  • La fagocitosis generalmente se estudia en entornos no confinados in vitro.
  • No se comprende bien la influencia del confinamiento físico en la fagocitosis.
  • La microglia juega un papel crítico en la respuesta inmune innata.

Objetivo del estudio:

  • Investigar el impacto del confinamiento físico en la fagocitosis mediada por IgG en las células similares a la microglía BV2.
  • Elucidar los mecanismos citoesqueléticos subyacentes a la fagocitosis modulada por el confinamiento y la migración celular.
  • Explorar el fenómeno de la "primación fagocítica" y su dependencia del confinamiento y la adhesión celular.

Principales métodos:

  • Se utilizaron células similares a la microglía BV2 en ensayos in vitro confinados y no confinados.
  • Investigó la fagocitosis mediada por IgG utilizando cuentas fluorescentes.
  • Se examinaron las funciones del complejo Arp2/3, la miosina II y la adhesión dependiente de la integrina utilizando inhibidores farmacológicos y alteraciones genéticas.
  • Se evaluó la migración celular y el "primado fagocítico" utilizando imágenes de células vivas.

Principales resultados:

  • El confinamiento físico aumentó significativamente la fracción de células fagocíticas en comparación con las condiciones no confinadas.
  • El confinamiento rescató parcialmente la absorción fagocítica tras la interrupción de la miosina II y confirió resistencia parcial a la citocalasina D.
  • La absorción de perlas estimuló la migración celular persistente, denominada "primado fagocítico", que requería una adhesión dependiente de la integrina.
  • Los requisitos citosqueléticos para la preparación fagocítica diferían entre los entornos confinados (se requiere el complejo Miosina II, Arp2/3) y los no confinados.

Conclusiones:

  • El confinamiento físico es un potente potenciador de la fagocitosis en la microglía.
  • El confinamiento altera la dinámica citoesquelética de la fagocitosis y la preparación fagocítica.
  • La iniciación fagocítica, modulada por el confinamiento, puede ser un mecanismo inmune innato clave para la vigilancia de la herida.