期刊
BIOFABRICATION
卷 11, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1758-5090/ab0478
关键词
microengineered 3D tissue models; poly(ethylene glycol) hydrogels; photopolymerization; 3D microstructures; intestinal epithelium
资金
- European Union's Horizon 2020 ERC grant [647863]
- CERCA Programme/Generalitat de Catalunya [2017-SGR-1079]
- Spanish Ministry of Economy and Competitiveness [TEC2014-51940-C2-2-R, TEC2017-83716-C2-1-R]
- Spanish Ministry of Economy and Competitiveness (Severo Ochoa Program for Centers of Excellence in RD 2016-2019)
- European Commission under Horizon 2020's Marie Sklodowska-Curie Actions COFUND scheme [712754]
- Severo Ochoa programme of the Spanish Ministry of Science and Competitiveness [SEV-2014-0425]
- European Research Council (ERC) [647863] Funding Source: European Research Council (ERC)
Epithelial tissues contain three-dimensional (3D) complex microtopographies that are essential for proper performance. These microstructures provide cells with the physicochemical cues needed to guide their self-organization into functional tissue structures. However, most in vitro models do not implement these 3D architectural features. The main problem is the availability of simple fabrication techniques that can reproduce the complex geometries found in native tissues on the soft polymeric materials required as cell culture substrates. In this study reaction-diffusion mediated photolithography is used to fabricate 3D microstructures with complex geometries on poly(ethylene glycol)-based hydrogels in a single step and moldless approach. By controlling fabrication parameters such as the oxygen diffusion/depletion timescales, the distance to the light source and the exposure dose, the dimensions and geometry of the microstructures can be well-defined. In addition, copolymerization of poly(ethylene glycol) with acrylic acid improves control of the dynamic reaction-diffusion processes that govern the free-radical polymerization of highly-diluted polymeric solutions. Moreover, acrylic acid allows adjusting the density of cell adhesive ligands while preserving the mechanical properties of the hydrogels. The method proposed is a simple, single-step, and cost-effective strategy for producing models of intestinal epithelium that can be easily integrated into standard cell culture platforms.
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