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Matrix Proteoglycans and Glycoproteins

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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Hyaluronan matrices in pathobiological processes.

Aimin Wang1, Carol de la Motte, Mark Lauer

  • 1Department of Biomedical Engineering, The Cleveland Clinic, Cleveland, OH 44195, USA. wanga@ccf.org

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Cell stress triggers hyaluronan matrix formation, influencing inflammation. High glucose levels cause intracellular hyaluronan synthesis, inducing endoplasmic reticulum stress and autophagy, crucial in diabetic pathologies.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathology

Background:

  • Hyaluronan (HA) matrices are vital in biological processes, synthesized by hyaluronan synthases.
  • These enzymes typically function at the plasma membrane, extruding HA into the extracellular space.
  • Extracellular HA interacts with cell surface receptors like CD44, modulating cellular functions.

Purpose of the Study:

  • To investigate the role of cell stress in initiating hyaluronan extracellular matrix synthesis.
  • To explore the mechanisms of HA synthesis under varying glucose conditions.
  • To understand the contribution of these processes to diabetic pathologies.

Main Methods:

  • Focus on recent studies detailing cell stress responses and HA synthesis.
  • Analysis of hyaluronan synthase activity at the cell membrane and intracellularly.
  • Examination of endoplasmic reticulum stress and autophagy induction.

Main Results:

  • Cell stress responses can initiate the synthesis of a monocyte-adhesive HA extracellular matrix.
  • Under physiological glucose, HA synthesis occurs at the cell membrane.
  • Under hyperglycemic conditions, dividing cells synthesize HA intracellularly, inducing ER stress and autophagy.

Conclusions:

  • Cell stress-induced HA matrices are central to inflammatory processes.
  • Intracellular HA synthesis under hyperglycemia contributes significantly to diabetic pathologies.
  • The interplay between HA matrices and inflammatory cells is critical in disease modulation.