3D printed silica-gelatin hybrid scaffolds of specific channel sizes promote collagen Type II, Sox9 and Aggrecan production from chondrocytes
File(s)Nelson et al accepted.pdf (8.87 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
Inorganic/organic hybrids have co-networks of inorganic and organic components, with the aim of obtaining synergy of the properties of those components. Here, a silica-gelatin sol-gel hybrid “ink” was directly 3D printed to produce 3D grid-like scaffolds, using a coupling agent, 3-glycidyloxypropyl)trimethoxysilane (GPTMS), to form covalent bonds between the silicate and gelatin co-networks. Scaffolds were printed with 1 mm strut separation, but the drying method affected the final architecture and properties. Freeze drying produced <40 μm struts and large ~700 μm channels. Critical point drying enabled strut consolidation, with ~160 μm struts and ~200 μm channels, which improved mechanical properties. This architecture was critical to cellular response: when chondrocytes were seeded on the scaffolds with 200 μm wide pore channels in vitro, collagen Type II matrix was preferentially produced (negligible amount of Type I or X were observed), indicative of hyaline-like cartilaginous matrix formation, but when pore channels were 700 μm wide, Type I collagen was prevalent. This was supported by Sox9 and Aggrecan expression. The scaffolds have potential for regeneration of articular cartilage regeneration, particularly in sports medicine cases.
Date Issued
2021-04
Date Acceptance
2021-02-08
Citation
Materials Science and Engineering: C, 2021, 123, pp.1-12
ISSN
0928-4931
Publisher
Elsevier BV
Start Page
1
End Page
12
Journal / Book Title
Materials Science and Engineering: C
Volume
123
Copyright Statement
© 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Medical Research Council (MRC)
Identifier
https://www.sciencedirect.com/science/article/pii/S092849312100103X?via%3Dihub
Grant Number
EP/I020861/1
MR/R015651/1
Subjects
3D printing
Articular cartilage
Hybrid
Scaffold
Biomedical Engineering
0903 Biomedical Engineering
0912 Materials Engineering
Publication Status
Published
Article Number
111964
Date Publish Online
2021-02-12