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Glycosaminoglycans01:23

Glycosaminoglycans

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Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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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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Autocrine signaling is one of the many signaling mechanisms that function inside multicellular organisms to carry out intercellular communication. In this type of signaling mechanism, the same cell that secretes an extracellular signaling molecule also expresses the receptors to bind and respond to that signaling molecule.
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Hyaluronan: biosynthesis and signaling.

Davide Vigetti1, Eugenia Karousou1, Manuela Viola1

  • 1Dipartimento di Scienze Chirurgiche e Morfologiche, Università degli Studi dell'Insubria, Via J.H. Dunant 5, 21100 Varese, Italy.

Biochimica Et Biophysica Acta
|February 12, 2014
PubMed
Summary
This summary is machine-generated.

Hyaluronan, a key extracellular matrix component, actively influences cell behavior through receptor interactions. Understanding its synthesis and signaling is vital for developing new therapeutic strategies.

Keywords:
AMPKExtracellular matrixGlycosaminoglycanHyaluronan receptorO-GlcNacylation

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Area of Science:

  • Extracellular Matrix Biology
  • Molecular Cell Biology

Background:

  • Hyaluronan is a crucial extracellular matrix component.
  • It influences tissue hydration, mechanical properties, and cellular architecture.
  • Hyaluronan mediates biological functions via interactions with molecules and receptors.

Purpose of the Study:

  • To review the regulation of hyaluronan synthesis.
  • To discuss the role of hyaluronan synthase 2 and covalent modifications.
  • To explore hyaluronan interactions with receptors and the impact of polymer size on signaling.

Main Methods:

  • Review of current literature on hyaluronan synthesis and signaling.
  • Analysis of hyaluronan-receptor interactions.
  • Examination of hyaluronan polymer size effects.

Main Results:

  • Hyaluronan synthase 2 is critical for hyaluronan synthesis control.
  • Covalent modifications impact hyaluronan synthase activity.
  • Polymer size is essential for modulating hyaluronan-mediated cell signaling.

Conclusions:

  • Hyaluronan is an active participant in cell behavior, not just a passive matrix component.
  • Hyaluronan's role in healthy and pathological conditions requires further investigation.
  • Hyaluronan-receptor pathways offer potential therapeutic targets.