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In-Depth Investigation of Electrostatic Interaction-Based Hydrogel Shrinking for Volumetric Printing and Tissue
Dmitrii Iudin, Léon J J A Gerridzen, Paulina N Bernal1
1Department of Orthopedics, University Medical Center Utrecht, Utrecht University, 3584 CX Utrecht, The Netherlands.
Biomacromolecules
|June 16, 2025
Summary
This study demonstrates a novel shrinking method for hyaluronic acid (HA)-based hydrogels, achieving significant size reduction for intricate tissue engineering applications. This technique enhances the precision of 3D-printed hydrogel structures.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Hydrogel Fabrication
Background:
- Three-dimensional printing of hydrogels is crucial for creating complex tissue scaffolds.
- Postprinting shrinking strategies can improve the fidelity of engineered tissues to native structures.
- Hyaluronic acid (HA)-based hydrogels offer biocompatibility and tunable properties for regenerative medicine.
Purpose of the Study:
- To investigate the shrinking behavior of hyaluronic acid (HA)-based hydrogels after 3D printing.
- To determine the influence of various parameters on shrinking efficiency and feature resolution.
- To assess the impact of polycation concentration on cell viability and hydrogel shrinkage.
Main Methods:
- Fabrication of HA-based hydrogels with incorporated RGD peptides for cell adhesion.
- Induction of hydrogel shrinking through polycation penetration and complexation.
- Systematic variation of HA macromer concentration, molecular weight, cross-linking density, initial volume, and polycation properties.
- Analysis of shrinking efficiency and feature size using microscopy.
- Evaluation of cell viability at different polycation concentrations.
Main Results:
- Hydrogel shrinking was effectively controlled by polycation penetration and complexation.
- Shrinking efficiency was influenced by HA concentration, molecular weight, cross-linking density, initial volume, and polycation characteristics.
- A polycation concentration of 0.1 wt % preserved cell viability while enabling effective shrinkage.
- 3D printed hydrogel structures achieved volume reductions up to 9 times, with feature sizes as small as 42 ± 6 μm.
- RGD peptide incorporation supported cell adhesion within the hydrogel network.
Conclusions:
- Polycation-induced shrinking is a powerful strategy for fabricating high-precision, reduced-dimension hydrogel structures.
- This method significantly enhances the ability to replicate the intricate features of native tissues for advanced tissue engineering.
- Optimized polycation concentrations are essential for balancing effective shrinkage with cell viability in engineered constructs.
