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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
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Cell Adhesion Molecules - Types and Functions01:20

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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...

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Sistema modelo para la adhesión celular mediada por las interacciones débil carbohidrato-carbohidrato.

Bärbel Lorenz1, Luis Álvarez de Cienfuegos, Marieelen Oelkers

  • 1Institute of Physical Chemistry, University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany.

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Resumen

Los hidratos de carbono de las esponjas marinas median la adhesión celular a través de interacciones dependientes del calcio. La microscopia de sonda coloidal reveló la fuerza dinámica y el panorama energético de estos enlaces multivalentes carbohidrato-carbohidrato.

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Biología Marina Biología Marina.
  • Química de los carbohidratos Química de los carbohidratos

Sus antecedentes:

  • La adhesión célula-célula es crucial para los organismos multicelulares.
  • Los organismos marinos, como las esponjas, utilizan interacciones moleculares únicas para la adhesión.
  • La comprensión de las interacciones entre carbohidratos y carbohidratos proporciona información sobre los mecanismos de adhesión biológica.

Objetivo del estudio:

  • Para investigar las interacciones carbohidratos-carbohidratos multivalentes de los epítopos anclados en la membrana de Microciona prolifera.
  • Para cuantificar la fuerza dinámica de la autoasociación homomérica en condiciones variables.
  • Para modelar el paisaje energético y la participación de bonos en estas interacciones.

Principales métodos:

  • Se utilizó microscopía de sonda coloidal para sondear las interacciones.
  • Acoplamiento in situ de disacáridos sulfatados y no sulfatados a superficies recubiertas de membrana.
  • Se realizaron mediciones de fuerza dinámica en función de la concentración de iones de calcio y la velocidad de carga.
  • Se aplicó un modelo determinista para analizar el panorama energético.

Principales resultados:

  • El estudio caracterizó las interacciones carbohidratos-carbohidratos multivalentes dependientes del calcio.
  • Se midió la fuerza dinámica de la autoasociación homomérica.
  • El panorama energético y el número de bonos participantes se estimaron utilizando un modelo determinista.

Conclusiones:

  • Las interacciones carbohidratos-carbohidratos multivalentes juegan un papel importante en la adhesión célula-célula en los organismos marinos.
  • Los iones de calcio son moduladores críticos de estas interacciones.
  • Los hallazgos proporcionan una comprensión cuantitativa de las fuerzas biofísicas que rigen la adhesión de las células de la esponja.