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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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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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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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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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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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Extracellular matrix protein expression is brain region dependent.

Stephanie Dauth1, Thomas Grevesse1, Harry Pantazopoulos2,3

  • 1Disease Biophysics Group, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, 02138.

The Journal of Comparative Neurology
|January 19, 2016
PubMed
Summary
This summary is machine-generated.

Brain extracellular matrix (ECM) proteins like aggrecan, brevican, and tenascin-R show distinct distributions. Their presence in vitro significantly inhibits neurite outgrowth, highlighting ECM

Keywords:
RRID: AB_2207009RRID: AB_398211RRID: AB_90460aggrecanbrain extracellular matrixbrevicanperineuronal netstenascin-R

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Extracellular matrix (ECM) networks in the brain are crucial for structural and functional diversity.
  • Dysregulation of ECM remodeling is implicated in neurodegenerative and psychiatric disorders.
  • Quantitative data on ECM distribution is lacking, hindering understanding of region-specific functions and disease roles.

Purpose of the Study:

  • To quantitatively analyze the distribution, colocalization, and expression of aggrecan, brevican, and tenascin-R in the rat brain.
  • To investigate the impact of these ECM proteins on neurite outgrowth in vitro.
  • To test the hypothesis that ECM proteins are differentially distributed, contributing to regional brain uniqueness.

Main Methods:

  • Immunohistochemistry and mass spectrometry were used for quantitative analysis of ECM protein distribution and expression in the rat brain.
  • In vitro assays assessed the effect of aggrecan, brevican, and tenascin-R on neurite outgrowth in a 3D environment.

Main Results:

  • Aggrecan, brevican, and tenascin-R exhibited differentiated distribution patterns throughout the rat brain.
  • The presence of these ECM proteins significantly reduced neurite outgrowth in the 3D in vitro model.

Conclusions:

  • The unique and complex distribution of ECM proteins is vital for brain physiology.
  • Understanding ECM protein distribution is key to elucidating their roles in brain health and disease.
  • Further research encoding ECM distribution patterns can aid in identifying disease mechanisms.