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Evaluation of scaffold microstructure and comparison of cell seeding methods using micro-computed tomography-based tools

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number20200102
Number of pages12
JournalJournal of the Royal Society. Interface
Volume17
Issue number165
DOIs
Publication statusPublished - 1 Apr 2020
Publication typeA1 Journal article-refereed

Abstract

Micro-computed tomography (micro-CT) provides a means to analyse and model three-dimensional (3D) tissue engineering scaffolds. This study proposes a set of micro-CT-based tools firstly for evaluating the microstructure of scaffolds and secondly for comparing different cell seeding methods. The pore size, porosity and pore interconnectivity of supercritical CO2 processed poly(l-lactide-co-ɛ-caprolactone) (PLCL) and PLCL/β-tricalcium phosphate scaffolds were analysed using computational micro-CT models. The models were supplemented with an experimental method, where iron-labelled microspheres were seeded into the scaffolds and micro-CT imaged to assess their infiltration into the scaffolds. After examining the scaffold architecture, human adipose-derived stem cells (hASCs) were seeded into the scaffolds using five different cell seeding methods. Cell viability, number and 3D distribution were evaluated. The distribution of the cells was analysed using micro-CT by labelling the hASCs with ultrasmall paramagnetic iron oxide nanoparticles. Among the tested seeding methods, a forced fluid flow-based technique resulted in an enhanced cell infiltration throughout the scaffolds compared with static seeding. The current study provides an excellent set of tools for the development of scaffolds and for the design of 3D cell culture experiments.

Keywords

  • cell seeding, micro-CT, microsphere, supercritical CO2 processing, tissue engineering, USPIO

Publication forum classification

Field of science, Statistics Finland