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Temperature-Responsive Nanofibrillar Hydrogels for Cell Encapsulation.

Héloïse Thérien-Aubin1, Yihe Wang1, Katja Nothdurft1

  • 1Department of Chemistry, University of Toronto , 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada.

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Summary
This summary is machine-generated.

Researchers created temperature-responsive nanofibrillar hydrogels using cellulose nanocrystals (CNCs). These smart biomaterials support cell culture and allow easy cell release for further analysis, advancing injectable hydrogel technology.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cell Biology

Background:

  • Natural extracellular matrices are often filamentous.
  • Few artificial extracellular matrices utilize nanofibrillar building blocks.
  • Developing advanced biomaterials for cell culture and analysis is crucial.

Purpose of the Study:

  • To prepare temperature-responsive nanofibrillar hydrogels from functionalized cellulose nanocrystals (CNCs).
  • To investigate the tunable properties and cell culture applications of these novel hydrogels.
  • To enable controlled cell encapsulation, culture, and release.

Main Methods:

  • Functionalization of rod-shaped CNCs with a temperature-responsive copolymer (N-isopropylacrylamide and N,N'-dimethylaminoethyl methacrylate).
  • Tuning copolymer composition and CNC-to-copolymer ratio to control gelation at 37 °C and dissociation at room temperature.
  • Encapsulation and culture of fibroblasts and T cells within the thermoreversible hydrogels.
  • Assessment of hydrogel mechanical properties, structure, and cytotoxicity.

Main Results:

  • Successfully prepared temperature-responsive nanofibrillar hydrogels from copolymer-functionalized CNCs.
  • Achieved tunable gelation at 37 °C and dissociation upon cooling.
  • Demonstrated low cytotoxicity and successful encapsulation and culture of fibroblasts and T cells.
  • Enabled facile release of cultured cells by temperature reduction.

Conclusions:

  • Developed injectable, temperature-responsive nanofibrillar hydrogels with tunable properties.
  • The hydrogels support cell viability and allow for temperature-triggered cell release.
  • This technology facilitates enhanced cell characterization and potential transfer to different media.