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Disodium Cromoglycate Templates Anisotropic Short-Chain PEG Hydrogels.

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Researchers developed a novel method to create anisotropic hydrogels using polyethylene glycol diacrylate (PEGDA) and disodium cromoglycate (DSCG) as a template. This technique enables the fabrication of aligned hydrogel scaffolds for tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Anisotropic hydrogels are crucial scaffolds in biomedical engineering, especially for tissue engineering.
  • Conventional methods for producing anisotropic hydrogels often require specialized equipment or complex synthesis.
  • There is a need for accessible fabrication techniques to create aligned hydrogel structures.

Purpose of the Study:

  • To explore the self-assembly of polyethylene glycol diacrylate (PEGDA) using disodium cromoglycate (DSCG) as a removable template.
  • To develop a facile method for fabricating anisotropic hydrogel networks without specialized equipment.
  • To investigate the influence of hydrogel microstructure on cell behavior and mechanotransduction.

Main Methods:

  • Utilized disodium cromoglycate (DSCG), a lyotropic chromonic liquid crystal, as a sacrificial template for hydrogel formation.
  • Polymerized short-chain PEGDA (Mn = 250) onto the surface of DSCG liquid crystal phases.
  • Controlled DSCG concentration to modulate PEGDA hydrogel microstructure and anisotropic mechanical properties.
  • Cultured human dermal fibroblasts on the fabricated anisotropic hydrogels to assess cell response.

Main Results:

  • Successfully formed anisotropic hydrogel networks with fibrin-like morphologies via PEGDA self-assembly on DSCG templates.
  • Demonstrated that DSCG concentration is a critical factor in controlling hydrogel microstructure and mechanical anisotropy.
  • Observed that human dermal fibroblasts exhibit density-dependent activation of Yes-associated protein (YAP) in response to hydrogel alignment.
  • Confirmed YAP's role in translating mechanical and morphological cues into cellular behaviors.

Conclusions:

  • Developed a versatile and accessible method for creating anisotropic PEG hydrogels using a DSCG template.
  • The fabricated hydrogels possess tunable microstructures and anisotropic mechanical properties suitable for tissue engineering.
  • Cellular responses, including YAP activation, are sensitive to the alignment order within the hydrogel scaffolds.
  • These biocompatible and biodegradable hydrogels hold significant promise for engineering functional tissues with physiological morphologies.