Video Experimental Relacionado
Updated: Jul 14, 2026

06:50
Sandwich-like Microenvironments to Harness Cell/Material Interactions
Published on: August 4, 2015
Una relación transmembrana entre la fibronectina y la vinculina (proteína 130 kd): modulación sérica en los
Cell
|May 1, 1981
Resumen
Este estudio revela que la vinculina y la fibronectina se colocalizan en estructuras celulares distintas, lo que sugiere dos tipos de fibronexos involucrados en la adhesión celular y las interacciones de la matriz.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- Anteriormente, se demostró una estrecha relación entre los microfilamentos de actina y las fibrillas de fibronectina (fibronexus) a través del microscopio electrónico.
- La vinculina, una proteína intracelular, se encuentra en los puntos de inserción de la fibra de actina, lo que provocó una investigación sobre su conexión con la fibronectina y el fibronexus.
Objetivo del estudio:
- Para investigar la relación entre la vinculina, la fibronectina y el fibronexus.
- Para determinar si la vinculina y la fibronectina se colocalizan en estructuras específicas de adhesión celular.
Principales métodos:
- Se empleó microscopía de inmunofluorescencia de doble etiqueta.
- Se analizaron las distribuciones celulares de vinculina y fibronectina en diferentes tipos de células y condiciones (fibroblastos normales, células transformadas por HSV, diferentes concentraciones séricas).
Principales resultados:
- Las distribuciones de vinculina y fibronectina coincidieron en los fibroblastos normales detenidos por G1 y las células transformadas tratadas con fibronectina.
- Parches focales vinculino-positivos colocalizados con fibronectina en la superficie celular ventral en las células diseminadas.
- Se observaron patrones distintos de fibronectina y vinculina en la superficie dorsal en los sitios de interacción célula-célula.
Conclusiones:
- Se implican dos tipos distintos de fibronexus: un nexo de adhesión al sustrato ventral (fibronectina, vinculina, actina) y una asociación de matriz dorsal.
- Las asociaciones transmembranares vinculina-fibronectina son sensibles al estado de crecimiento de la célula.
Más Videos Relacionados
Videos de Conceptos Relacionados
Fibronectins Connect Cells with ECM
Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Overview of Cell-Matrix Interactions
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...
Intracellular Signaling Affects Focal Adhesions
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.
Some...
Some...
Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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...
Anchoring junctions mechanically attach a cell to the...
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...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

