Tunable microgel-templated porogel (MTP) bioink for 3D bioprinting applications
File(s)
Author(s)
Ouyang, L
Wojciechowski, Allan
Tang, J
Guo, Yuzhi
Stevens, Molly
Type
Journal Article
Abstract
Micropores are essential for tissue engineering to ensure adequate mass transportation for embedded cells. Despite the considerable progress made by advanced 3D bioprinting technologies, it remains challenging to engineer micropores of 100 µm or smaller in cell-laden constructs. Here, a microgel-templated porogel (MTP) bioink platform is reported to introduce controlled microporosity in 3D bioprinted hydrogels in the presence of living cells. Templated gelatin microgels are fabricated with varied sizes (≈10, ≈45, and ≈100 µm) and mixed with photo-crosslinkable formulations to make composite MTP bioinks. The addition of microgels significantly enhances the shear-thinning and self-healing viscoelastic properties and thus the printability of bioinks with cell densities up to 1 × 108 mL−1 in matrix. Consistent printability is achieved for a series of MTP bioinks based on different component ratios and matrix materials. After photo-crosslinking the matrix phase, the templated microgels dissociated and diffused under physiological conditions, resulting in corresponding micropores in situ. When embedding osteoblast-like cells in the matrix phase, the MTP bioinks support higher metabolic activity and more uniform mineral formation than bulk gel controls. The approach provides a facile strategy to engineer precise micropores in 3D printed structures to compensate for the limited resolution of current bioprinting approaches.
Date Issued
2022-01-17
Date Acceptance
2022-01-11
Citation
Advanced Healthcare Materials, 2022, 11 (8)
ISSN
2192-2640
Publisher
Wiley-VCH Verlag
Journal / Book Title
Advanced Healthcare Materials
Volume
11
Issue
8
Copyright Statement
© 2022 The Authors. Advanced Healthcare Materials published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Sponsor
Engineering & Physical Science Research Council (E
Medical Research Council (MRC)
Royal Academy Of Engineering
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/adhm.202200027
Grant Number
20249480
MR/R015651/1
CIET2021\94
Subjects
Science & Technology
Technology
Engineering, Biomedical
Nanoscience & Nanotechnology
Materials Science, Biomaterials
Engineering
Science & Technology - Other Topics
Materials Science
bioinks
bioprinting
hydrogels
microporosity
tissue engineering
TISSUE
SCAFFOLDS
POROSITY
PORE
bioinks
bioprinting
hydrogels
microporosity
tissue engineering
Bioprinting
Hydrogels
Microgels
Printing, Three-Dimensional
Tissue Engineering
Tissue Scaffolds
Hydrogels
Tissue Engineering
Tissue Scaffolds
Bioprinting
Printing, Three-Dimensional
Microgels
0304 Medicinal and Biomolecular Chemistry
0903 Biomedical Engineering
1004 Medical Biotechnology
Publication Status
Published online
Article Number
ARTN 2200027
Date Publish Online
2022-01-17