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The Extracellular Matrix01:42

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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Cell-matrix's Response to Mechanical Forces01:13

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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. 
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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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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:...
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The basal lamina is a thin extracellular layer that lies underneath the cells and separates them from other tissues. The three layers of the basal lamina are lamina lucida, lamina densa and lamina reticularis. The basal lamina, a mixture of glycoproteins and collagen, provides an attachment site for the epithelium, separating it from underlying connective tissue. The framework of basal lamina has other essential proteins such as laminins mesh, perlecan, entactin, and type IV collagen.
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Extracellular Matrix of Echinoderms.

Igor Yu Dolmatov1, Vladimir A Nizhnichenko1

  • 1A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Palchevsky 17, 690041 Vladivostok, Russia.

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Summary

Echinoderm connective tissue has a complex extracellular matrix (ECM) with diverse proteins and enzymes. Its unique composition, differing from vertebrates, influences mechanical properties through intricate molecular interactions.

Keywords:
collagenechinodermsextracellular matrix (ECM)glycoproteinmutable collagenous tissueproteoglycantensilin

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Area of Science:

  • Marine Biology
  • Biochemistry
  • Echinoderm Research

Background:

  • The extracellular matrix (ECM) is crucial for connective tissue structure and function.
  • Echinoderms exhibit unique biological adaptations, including their connective tissue organization.

Purpose of the Study:

  • To review and synthesize current knowledge on the composition of the echinoderm extracellular matrix (ECM).
  • To compare the echinoderm ECM with that of vertebrates, highlighting key differences and similarities.

Main Methods:

  • Literature review of existing data on echinoderm ECM composition.
  • Analysis of identified ECM proteins, proteases, and inhibitors in echinoderms.
  • Comparative analysis with vertebrate ECM components.

Main Results:

  • Echinoderm ECM contains diverse collagens, glycoproteins, and proteoglycans, along with synthesis enzymes.
  • Key vertebrate ECM components like elastin and fibronectins are absent in echinoderms.
  • A wide array of proteinases and inhibitors are present, contributing to ECM regulation.

Conclusions:

  • The echinoderm ECM is complex, featuring unique protein compositions and enzymatic machinery.
  • Variations in mechanical properties of echinoderm connective tissue are linked to ECM composition and molecular interactions.