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The Photocleavable Protein PhoCl-Based Dynamic Hydrogels.

Jingqi Lei1, Hongbin Li1

  • 1Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.

ACS Biomaterials Science & Engineering
|November 15, 2024
PubMed
Summary
This summary is machine-generated.

Researchers engineered a new photoresponsive protein hydrogel using photocleavable protein PhoCl. This dynamic hydrogel softens upon violet light exposure, enabling dynamic cell culture studies.

Keywords:
3T3 cellsPhoCl-containing hydrogelSpyTag and SpyCatcher chemistrylight-induced stiffness changephotoresponsive hydrogels

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Area of Science:

  • Biomaterials Science
  • Protein Engineering
  • Soft Matter Physics

Background:

  • Dynamic protein hydrogels offer tunable properties and biocompatibility.
  • Photoresponsive hydrogels are particularly interesting for controlled material changes.
  • Existing hydrogels lack precise, light-induced stiffness modulation.

Purpose of the Study:

  • To engineer a novel photoresponsive protein hydrogel using photocleavable protein PhoCl.
  • To investigate the hydrogel's response to light-induced cleavage and stiffness changes.
  • To explore the utility of this hydrogel as a dynamic cell culture substrate.

Main Methods:

  • Utilized SpyTag/SpyCatcher chemistry to create covalently cross-linked hydrogels incorporating PhoCl.
  • Incorporated PhoCl as a dynamic motif to regulate hydrogel cross-linking density.
  • Irradiated hydrogels with violet light to induce PhoCl cleavage and observe viscoelastic property changes.

Main Results:

  • Developed PhoCl-containing hydrogels exhibiting photoresponsive viscoelastic properties.
  • Violet irradiation caused hydrogel softening and irreversible reduction in storage moduli without gel-sol transition.
  • Demonstrated dynamic changes in NIH-3T3 fibroblast cell morphology on the hydrogel substrate in response to stiffness changes.

Conclusions:

  • PhoCl-based protein hydrogels provide a platform for light-controlled stiffness modulation.
  • The hydrogels serve as dynamic substrates for studying cell mechanobiology.
  • This technology offers potential for advanced tissue engineering and regenerative medicine applications.