Name: how ecm supports animal tissues
Uploaded: 2026-06-01T06:27:55.223Z
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The Extracellular Matrix

The extracellular matrix, or ECM, is a network of fibrous proteins like collagen and elastin and a ground substance that surrounds cells and fills the spaces between them.
 
 The ground substance is a hydrated gel made up of glycosaminoglycans, proteoglycans, glycoproteins, and interstitial fluid, which is mainly water with dissolved ions and gases.
 
 Local cells, especially fibroblasts, secrete most ECM components. Macrophages and other cells also help remodel the matrix.
 
 The ECM contains glycosaminoglycans, or GAGs, which bind water. When attached to core proteins, GAGs form proteoglycans.
 
 In cartilage, hyaluronic acid forms large proteoglycan aggregates. Proteoglycans that contain chondroitin sulfate bind to hyaluronic acid and help the tissue resist compression. Loss of these proteoglycans in cartilage can contribute to osteoarthritis.
 
 Collagens provide rigidity and are especially important in tendons, which join muscles to bones.
 
 Fibronectin acts like a molecular glue and helps cells attach to collagen and GAGs. Cells bind to fibronectin through integrins, which connect the ECM to the cell interior and support signaling.
 
 During migration, cells use these attachments to pull themselves forward across the ECM, which also acts as a support network that guides their movement and behavior.

Frantz, Christian, Kathleen M. Stewart e Valerie M. Weaver. "La matrice extracellulare a colpo d'occhio." Journal of Cell Science 123, n. 24 (15 dicembre 2010): 4195–4200. [<a href="https://doi.org/10.1242/jcs.023820" target="__blank">Sorgente</a>]

Alberts, Bruce, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts e Peter Walter. "La matrice extracellulare degli animali". Biologia molecolare della cellula. 4a edizione, 2002. [<a href="https://www.ncbi.nlm.nih.gov/books/NBK26810/" target="__blank">Sorgente</a>]

la matrice extracellulare

<h4>Panoramica</h4>

Al fine di mantenere l&#x27;organizzazione dei tessuti, molte cellule animali sono circondate da molecole strutturali che costituiscono la matrice extracellulare (ECM). Insieme, le molecole nell&#x27;ECM mantengono l&#x27;integrit&#xE0; strutturale dei tessuti e le notevoli propriet&#xE0; specifiche di alcuni tessuti.

<h4>Composizione della matrice extracellulare</h4>

La matrice extracellulare (ECM) &#xE8; comunemente composta da sostanza macinata, un liquido simil gel, componenti fibrosi, e molte molecole strutturalmente e funzionalmente diverse. Queste molecole includono polisacaridi chiamati glicosaminogilicani (GAG). I GAG occupano la maggior parte dello spazio extracellulare e spesso occupano un grande volume rispetto alla loro massa. Questo si traduce in una matrice che pu&#xF2; sopportare enormi forze di compressione. La maggior parte dei GAL sono legati alle proteine, creando proteoglicani.. Queste molecole conservano gli ioni di sodio in base alla loro carica positiva e quindi attraggono l&#x27;acqua, che mantiene l&#x27;ECM idratato.

L&#x27;ECM contiene anche fibre rigide come i collageni, la componente proteica primaria dell&#x27;ECM. I collageni sono le proteine pi&#xF9; abbondanti negli animali, che costituiscono il 25% delle proteine per massa. Una grande diversit&#xE0; di collageni con somiglianze strutturali forniscono forza di tensione a molti tessuti.

In particolare, tessuti come la pelle, vasi sanguigni, e polmoni devono essere sia forte e elastico per svolgere il loro ruolo fisiologico. Una proteina chiamata elastina d&#xE0; a fibre particolari la capacit&#xE0; di allungare e ritrarre. La fibronectina &#xE8; una glicoproteina importante nell&#x27;adesione cellulare, in quanto si lega direttamente alle proteine che si estendono attraverso la membrana delle cellule, in particolare le integrine, collegando la membrana all&#x27;ECM. L&#x27;integrina interagisce anche con il collagene che pu&#xF2; suscitare risposte intracellulari.

<h4>La composizione della matrice extracellulare &#xE8; dipendente da un tessuto e da una cellula</h4>

La marcatura e la proporzione relativa di ciascuna di queste molecole sono determinate dalla posizione, dalla funzione fisiologica e dai tipi di cellule vicine del tessuto in cui risiedono le cellule. Questa specifica composizione molecolare dell&#x27;ECM &#xE8; indicata come il microambientelocale. Le cellule di un particolare tessuto secernono molecole che determinano l&#x27;ECM circostante. Ad esempio, le cellule intestinali sintetizzano, modificano e secernono le molecole necessarie per la matrice che le circonda, mentre gli osteoblasti generano le molecole del rigido ECM dell&#x27;osso umano. Questa diversit&#xE0; nella composizione ECM in diversi tessuti crea particolari propriet&#xE0; in base al loro ruolo unico e funzione.

<h4>La matrice extracellulare pu&#xF2; essere coinvolta nella comunicazione cellulare</h4>

&#xC8; stato dimostrato che anche l&#x27;interazione tra le cellule e l&#x27;ECM locale ha un impatto intracellulare. Ad esempio, le forze sulle molecole di integrina transmembrana possono comportare l&#x27;attivazione della rete di actomiosina intracellulare. Questo pu&#xF2; promuovere la migrazione cellulare, divisione, e altre risposte cellulari. Alcune di queste risposte includono cambiamenti nell&#x27;espressione genica e nelle cascate di segnalazione cellulare. Allo stesso modo, l&#x27;integrina pu&#xF2; comunicare informazioni intracellulari all&#x27;esterno della cellula. Inoltre, ECM &#xE8; noto per legare le molecole di segnalazione, che possono essere rilasciate dopo la degradazione ECM.

<h4>Rimodellamento della matrice extracellulare</h4>

Le cellule animali devono avere la capacit&#xE0; di degradare e rimodellare l&#x27;ECM. Ci&#xF2; &#xE8; particolarmente vero nei casi di riparazione e crescita dei tessuti. Di conseguenza, le cellule in genere possiedono gli enzimi necessari per abbattere l&#x27;ECM. Questi enzimi includono metalloproteasi a matrice (MMP) che lavorano con altri enzimi per degradare proteine come collagene e fibronectina. La degradazione e il rimodellamento dell&#x27;ECM sono importanti nella crescita sana dei tessuti, compresa la diramazione dei vasi sanguigni. Al rovescio della medaglia, ECM rimodellamento contribuisce anche alla metastasi delle cellule cancerose come si diffondono attraverso il corpo.

La matrice extracellulare

Overview

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). ...

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how ecm supports animal tissues

The extracellular matrix (ECM) supports animal tissues by surrounding cells with structural molecules. It helps maintain tissue organization and gives tissues their specific physical properties. The ECM includes a gel-like ground substance, fibrous components, and many molecules with different jobs.

A major part of the ECM is made of glycosaminoglycans, or GAGs. These polysaccharides fill much of the extracellular space and can take up a large volume for their mass. That makes the matrix resistant to compression. Most GAGs are attached to proteins, forming proteoglycans. These molecules hold sodium ions because of their positive charge and attract water. This helps keep the ECM hydrated.

The ECM also contains strong fibers such as collagens. Collagen is the main protein in the ECM and the most abundant protein group in animals, making up about 25% of protein by mass. Many collagen types share a similar structure and give tissues tensile strength, or resistance to being pulled apart. This matters in tissues such as skin, blood vessels, and lungs, which need to be both strong and stretchy. Elastin helps some fibers stretch and then return to their original shape.

Another important ECM molecule is fibronectin. It is a glycoprotein that helps cells stick to the ECM. Fibronectin attaches to integrins, which are proteins that span the cell membrane. This link connects the cell membrane to the ECM. Integrins can also interact with collagen and may trigger responses inside the cell.

The makeup of the ECM depends on the tissue and the cell type. This local molecular setting is called the microenvironment. Cells in each tissue secrete the molecules that build the ECM around them. For example, intestinal cells make and release the molecules around them, while osteoblasts build the rigid ECM found in human bone. These differences give each tissue the properties it needs for its role.

The ECM also helps cells communicate. Forces on integrins can activate the actomyosin network inside the cell. That can affect cell migration, division, gene expression, and signaling pathways. Integrins can also pass information from inside the cell to the outside. In addition, the ECM can bind signaling molecules and release them when it is broken down.

Animal cells must also be able to break down and rebuild the ECM. This remodeling is important during tissue repair and growth. Cells use enzymes, including matrix metalloproteases (MMPs), to degrade ECM proteins such as collagen and fibronectin. ECM remodeling helps normal processes such as blood vessel branching. However, it can also help cancer cells spread through the body during metastasis.

How ECM Supports Animal Tissues

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the extracellular matrix

The extracellular matrix (ECM) supports animal tissues by surrounding cells with structural molecules. It helps maintain tissue organization and gives tissues their specific physical properties. The ECM includes a gel-like ground substance, fibrous components, and many molecules with different jobs. A major part of the ECM is made of glycosaminoglycans, or GAGs. These polysaccharides fill much of the extracellular space and can take up a large volume for their mass. That makes the matrix...

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key terms and concepts

Explore how the extracellular matrix supports animal tissues, from collagen and proteoglycans to cell signaling and ECM remodeling in growth and repair.

How ECM Supports Animal Tissues | JoVE K12

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How ECM Supports Animal Tissues

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