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The Extracellular Matrix01:42

The Extracellular Matrix

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The Extracellular Matrix01:29

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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...
Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
Overview of Cell-Matrix Interactions01:24

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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...
Integrins01:10

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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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Glycocalyx and its Functions01:14

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The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
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Video Experimental Relacionado

Updated: May 11, 2026

A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix
09:40

A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix

Published on: January 4, 2017

Estudios sobre las matrices de glicoproteínas LETS intercelulares.

L B Chen, A Murray, R A Segal

    Cell
    |June 1, 1978
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los fibroblastos de embriones de pollo secretan matrices extracelulares compuestas principalmente por proteínas sensibles a grandes transformaciones externas (LETS). Estas matrices de proteínas LETS, unidas por enlaces disulfuro, influyen en la forma celular y la fusión de los mioblastos.

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    A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix
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    Published on: January 4, 2017

    Glycoproteomics of the Extracellular Matrix: A Method for Intact Glycopeptide Analysis Using Mass Spectrometry
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    Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions
    11:21

    Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions

    Published on: January 20, 2022

    Área de la Ciencia:

    • Biología celular Biología celular.
    • La bioquímica es la bioquímica.
    • Investigación de la matriz extracelular.

    Sus antecedentes:

    • El contacto célula-célula es esencial para la formación de matrices extracelulares por los fibroblastos de embriones de pollo.
    • Estas matrices son fibrosas, con fibras individuales que miden entre 5 y 10 nm de diámetro, y se agrupan en haces.

    Objetivo del estudio:

    • Investigar la composición y las propiedades de las matrices intercelulares secretadas por los fibroblastos de embriones de pollo.
    • Determinar el papel de las proteínas sensibles a grandes transformaciones externas (LETS, por sus siglas en inglés) en la formación y función de la matriz.

    Principales métodos:

    • Microscopía electrónica de barrido y transmisión para visualizar la estructura de la matriz.
    • Técnicas de inmunofluorescencia e inmunoferritina para identificar los componentes de las proteínas.
    • Tratamiento con detergente para aislar matrices libres de células.
    • Estudios de solubilización con el uso de beta-mercaptoetanol.

    Principales resultados:

    • La proteína LETS es un componente importante, constituyendo más del 90% de las matrices libres de células.
    • Las matrices son probablemente polímeros de proteína LETS unidos por enlaces disulfuro, como lo indican los requisitos de solubilización.
    • El colágeno no está involucrado en estas matrices.
    • Las matrices de proteínas LETS promueven cambios en la forma celular y la fusión de mioblastos, pero no afectan el crecimiento celular, la absorción de glucosa o la producción de proteasas.

    Conclusiones:

    • Las matrices extracelulares de los fibroblastos de embriones de pollo están compuestas principalmente por la proteína LETS, que forma un polímero ligado al disulfuro.
    • Las matrices de proteínas LETS juegan un papel importante en la regulación de la morfología celular y la fusión, independientemente del crecimiento celular o la actividad metabólica.