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Related Concept Videos

The Extracellular Matrix01:29

The Extracellular Matrix

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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
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The Extracellular Matrix01:42

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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...
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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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Extracellular Matrix01:26

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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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Matrix Proteoglycans and Glycoproteins01:21

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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...
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Tunable Hydrogels from Pulmonary Extracellular Matrix for 3D Cell Culture
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Extracellular Matrix-Based Biomaterials and Their Influence Upon Cell Behavior.

Madeline C Cramer1,2, Stephen F Badylak3,4,5

  • 1McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.

Annals of Biomedical Engineering
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Biologic scaffolds made from extracellular matrix (ECM) aid tissue repair. ECM scaffold quality, influenced by preparation methods, significantly impacts clinical outcomes and promotes constructive tissue remodeling.

Keywords:
Biologic scaffoldConstructive remodelingDecellularizationHost response

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Biologic scaffold materials derived from extracellular matrix (ECM) are utilized for tissue repair and remodeling.
  • Clinical outcomes of ECM-based materials vary significantly, ranging from poor to excellent.
  • Variability in outcomes is attributed to differences in source tissue, decellularization efficacy, and post-processing steps.

Purpose of the Study:

  • To describe methods of ECM preparation and their impact on scaffold quality.
  • To elucidate the mechanisms by which ECM scaffolds promote constructive tissue remodeling.
  • To provide examples of favorable cellular responses to ECM bioscaffolds.

Main Methods:

  • Review of ECM preparation techniques, including source tissue selection, decellularization, and post-processing.
  • Analysis of ECM scaffold properties influencing biological responses.
  • Examination of cellular interactions with ECM, including immune and stem cell responses.

Main Results:

  • ECM scaffold preparation methods critically influence the quality and biological activity of the final product.
  • ECM scaffolds provide mechanical support, release bioactive molecules, and recruit/differentiate endogenous cells.
  • ECM scaffolds modulate immune responses towards an anti-inflammatory phenotype, promoting constructive remodeling.

Conclusions:

  • ECM scaffold preparation methods are crucial for achieving predictable and favorable clinical outcomes in tissue repair.
  • Understanding ECM processing is key to optimizing scaffold design for regenerative medicine applications.
  • ECM bioscaffolds effectively support tissue regeneration by orchestrating cellular and molecular events.