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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.
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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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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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Complexometric Titration: Ligands00:43

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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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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Ligand Composition and Coating Density Co-Modulate the Chondrocyte Function on Poly(glycerol-dodecanedioate).

Yue Qin1, Rhima M Coleman1,2

  • 1Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Journal of Functional Biomaterials
|September 27, 2023
PubMed
Summary

Coating poly(glycerol-dodecanedioate) scaffolds with collagen or hyaluronic acid enhances human articular chondrocyte function for cartilage tissue engineering (CTE). This biomaterial modification promotes cell activity and matrix production, crucial for effective cartilage repair.

Keywords:
ECM ligand coatingcartilage tissue engineeringchondrocyte redifferentiationpoly(glycerol-dodecanedioate)scaffold design parameterssurface modification

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Articular cartilage repair faces challenges in chondrocyte redifferentiation and matrix production.
  • Poly(glycerol-dodecanedioate) (PGD) is a potential scaffold material for cartilage tissue engineering (CTE).
  • PGD's hydrophobic surface limits cell attachment and growth compared to natural extracellular matrix (ECM).

Purpose of the Study:

  • To modify PGD surface properties using collagen type I and/or hyaluronic acid coatings.
  • To evaluate the impact of ligand composition and density on human articular chondrocytes (hACs) cultured on PGD.
  • To investigate the effects on hACs' surface properties, morphology, metabolic activity, phenotype, and ECM production.

Main Methods:

  • PGD scaffolds were coated with varying masses of collagen type I and/or hyaluronic acid.
  • Surface properties (e.g., hydrophilicity) of coated PGD were analyzed.
  • hACs were cultured on modified PGD surfaces.
  • Cell morphology, metabolic activity, phenotype (redifferentiation), and ECM production were assessed.

Main Results:

  • ECM ligand coatings significantly improved PGD hydrophilicity.
  • Coatings promoted chondrocyte anabolic activity and ECM production.
  • Ligand composition and density co-modulated hAC morphology and activity.
  • Hyaluronic acid and collagen combinations maintained a rounded cell shape and redifferentiated phenotype.

Conclusions:

  • ECM ligand modification of PGD creates a more cell-friendly interface for CTE.
  • Combinatorial effects of ligand composition and density are critical for chondrocyte function.
  • PGD, when surface-modified, shows promise as a scaffold for cartilage tissue engineering.