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Updated: Apr 25, 2026
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Bioprinting Cellularized Constructs Using a Tissue-specific Hydrogel Bioink
Published on: April 21, 2016
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Nanoengineered Micellar Hydrogel with Controllable Strain-Dependent Behavior for Brain Slice-Like Tissue Patch
Shih-Ho Lin1, Junpeng Xu1, Wei-Tsung Chuang2
1Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan.
Small (Weinheim an Der Bergstrasse, Germany)
|April 24, 2026
Summary
This study presents a novel chitosan bioink for neural tissue engineering. The bioink demonstrates excellent printability and supports neural stem cell differentiation, paving the way for advanced brain tissue constructs.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Rheology
Background:
- Extrusion-based bioprinting (EBB) requires advanced bioinks with tailored properties for successful tissue fabrication.
- Soft hydrogels are crucial for central nervous system tissue engineering, demanding precise control over cell viability and differentiation.
- Understanding the structure-property relationship is key to optimizing bioink performance in EBB.
Purpose of the Study:
- To develop and characterize a nanoengineered chitosan micelle-crosslinked hydrogel (CDP) bioink for neural tissue engineering.
- To investigate the influence of dynamic covalent crosslinking and micelle stacking on the rheological properties and printability of the bioink.
- To evaluate the biocompatibility and efficacy of the optimized bioink in supporting neural stem cell differentiation and viability.
Main Methods:
- Development of a nanoengineered chitosan micelle-crosslinked hydrogel (CDP) system.
- Rheological characterization, including shear strain tolerance and modulus determination.
- Rheo-Small-Angle X-ray Scattering (SAXS) and Small-Angle Neutron Scattering (SANS) for structural analysis of micelles.
- Assessment of neural stem cell viability, differentiation, and tissue patch manipulation post-printing.
Main Results:
- The CDP bioink achieved three distinct rheological properties by tuning crosslinking and micelle stacking.
- Optimized CDP-II bioink showed excellent shear strain tolerance (200%) and stability.
- Rheo-SAXS revealed reversible lyotropic liquid crystal (LLC) structures, and SANS identified micelle radius (8.1 nm) and packing ratio (36%).
- CDP-II bioink (0.6 kPa shear modulus) supported neural stem cell differentiation and survival, enabling the creation of manipulable brain slice-like tissue patches.
Conclusions:
- The developed CDP bioink system offers tunable rheological properties crucial for extrusion-based bioprinting.
- The characterized structure-property relationship provides a model for designing binary hydrogels for precise bioprinting applications.
- The bioink's performance highlights its potential for advancing neural tissue engineering and creating functional brain constructs.
