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Guest-host interlinked PEG-MAL granular hydrogels as an engineered cellular microenvironment.

Adrienne E Widener1, Mallika Bhatta, Thomas E Angelini

  • 1J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA. ephelps@bme.ufl.edu.

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|January 12, 2021
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Summary
This summary is machine-generated.

We developed a novel polyethylene glycol (PEG) microgel system using guest-host chemistry. This scaffold enables rapid cell migration and exhibits shear-thinning properties, unlike traditional PEG hydrogels.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Cellular Engineering

Background:

  • Conventional bulk polyethylene glycol (PEG) hydrogels are widely used for engineering cellular microenvironments.
  • However, these materials often impede rapid cell migration.
  • There is a need for advanced hydrogel scaffolds that facilitate cell movement.

Purpose of the Study:

  • To develop a novel PEG hydrogel scaffold that overcomes the limitations of conventional bulk PEG hydrogels.
  • To engineer a material that allows for rapid cell migration while maintaining structural integrity.
  • To investigate the potential of guest-host chemistry for creating advanced biomaterials.

Main Methods:

  • Development of discrete polyethylene glycol (PEG) microgels functionalized with guest (adamantane) and host (β-cyclodextrin) molecules.
  • Assembly of PEG microgels into a cohesive bulk material via reversible guest-host interactions.
  • Characterization of the resulting granular system's structure and properties, including cell migration and rheology.
  • Utilizing thiol click chemistry for functionalization of PEG-MAL.

Main Results:

  • Successful creation of a densely packed granular PEG microgel system with an intrinsic interstitium-like negative space.
  • Demonstration of rapid migration of THP-1 monocyte cells through the guest-host microgel network.
  • Observation of shear-thinning behavior in the developed microgel material.
  • Reversible non-covalent linkages formed between microgel particles via guest-host molecular interactions.

Conclusions:

  • The developed guest-host PEG microgel system offers a promising alternative to conventional bulk PEG hydrogels.
  • This novel scaffold facilitates rapid cell migration, a critical factor in tissue engineering and regenerative medicine.
  • The shear-thinning property provides an additional advantage for material processing and application.