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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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Cell Migration01:19

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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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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.
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Activation of Integrins01:15

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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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A Flow Adhesion Assay to Study Leucocyte Recruitment to Human Hepatic Sinusoidal Endothelium Under Conditions of Shear Stress
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Las integrinas alfa-4 median la fijación de los linfocitos y su rotación bajo el flujo fisiológico.

C Berlin1, R F Bargatze, J J Campbell

  • 1Department of Pathology, Stanford University, California 94305.

Cell
|February 10, 1995
PubMed
Resumen

Las integrinas alfa 4 (CD49d) inician la adhesión de los linfocitos bajo flujo de cizallamiento, independientemente de las selectinas. Estas integrinas, a diferencia de las integrinas beta 2, son cruciales para las interacciones y adherencias iniciales de los leucocitos.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las interacciones entre leucocitos y células endoteliales son críticas para las respuestas inmunes.
  • Las selectinas inician la rotación de leucocitos bajo corte fisiológico, que precede a la detención mediada por integrina.
  • Las integrinas beta 2 (CD18) requieren el compromiso de selectina para la adhesión de neutrófilos.

Objetivo del estudio:

  • Investigar el papel de las integrinas alfa 4 (CD49d) en el inicio de la adhesión leucocitaria bajo flujo de cizallamiento.
  • Determinar si las integrinas alfa-4 pueden mediar la adhesión independientemente de las selectinas.
  • Para dilucidar el mecanismo de la adhesión mediada por alfa 4 integrina, incluidas las interacciones de ligando y la presentación topográfica.

Principales métodos:

  • Ensayos de flujo de cizallamiento in vitro para evaluar la atadura y el rodillo de los linfocitos.
  • Estudios in situ de la fijación de los linfocitos a la lámina propia de las venas.
  • Microscopía electrónica de barrido para visualizar la distribución de integrina en las células linfoides.

Principales resultados:

  • Las integrinas alfa 4 (CD49d) inician la vinculación de los linfocitos bajo corte, sin participación selectiva.
  • Los ligandos alfa 4 de la integrina (MAdCAM-1, VCAM-1) apoyan el rodamiento y la detención dependiente de la activación.
  • Alpha 4 beta 7 media la adhesión de los linfocitos independientes de la L-selectina in vivo.
  • Alpha 4 beta 7 está concentrado en microvilli, lo que facilita el contacto inicial, mientras que las integrinas beta 2 están excluidas.

Conclusiones:

  • Las integrinas alfa 4, pero no las integrinas beta 2, pueden iniciar la adhesión de leucocitos en condiciones de flujo.
  • La presentación topográfica de las integrinas alfa-4 en las microvillas contribuye a su papel en la iniciación de la adhesión.
  • Estos hallazgos revelan un mecanismo distinto para la iniciación de la adhesión linfocítica mediada por alfa 4 integrinas.