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Responsive 3D Printed Microstructures Based on Collagen Folding and Unfolding.

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Summary

Researchers developed a novel collagen-based ink for 3D laser printing, creating responsive biomaterials for tissue engineering. This advance enables precise fabrication of complex microstructures with potential for 4D printing applications.

Keywords:
4D printingextracellular matrixself‐assemblystimuli‐responsive materialstwo‐photon laser printing

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Biomedical Engineering

Background:

  • Extracellular matrices are crucial for tissue engineering, with collagen providing mechanical stability and regulating cellular processes.
  • Two-photon 3D laser printing allows high-resolution structuring of biomaterials, but collagen microprinting has been limited to simple designs.
  • Developing advanced biomaterials is key for progress in regenerative medicine and biomedical applications.

Purpose of the Study:

  • To present an accessible method for 3D microprinting of collagen using a novel ink system.
  • To demonstrate the fabrication of defined 3D microstructures with subcellular resolution.
  • To explore the potential of these microstructures as responsive biomaterials for 4D printing.

Main Methods:

  • Formulation of a collagen type I methacrylamide (ColMA) ink system, storable at room temperature.
  • Precise 3D microprinting of the ColMA ink using a commercial two-photon 3D laser printer.
  • Optimization of printing parameters and characterization of the resulting microstructures, including thermal response analysis and molecular dynamics simulations.

Main Results:

  • A room-temperature-stable ColMA ink was successfully developed for precise 3D microprinting.
  • Defined 3D microstructures with controlled geometries were fabricated using optimized printing parameters.
  • Printed collagen microstructures exhibited reversible thermal responses, indicating successful collagen folding/unfolding, supported by simulations.

Conclusions:

  • The study introduces an accessible approach for 3D microprinting of collagen, enabling the creation of complex and responsive biomaterials.
  • The developed ColMA ink and printing method facilitate the fabrication of microstructures suitable for advanced tissue engineering.
  • This work opens new avenues for designing novel responsive biomaterials for 4D (micro)printing applications.