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Adv Healthc Mater. 2017 Aug;6(16). doi: 10.1002/adhm.201700072. Epub 2017 May 16.

Microcarriers with Synthetic Hydrogel Surfaces for Stem Cell Expansion.

Author information

1
Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, 1111 Highland Ave., WIMR 5418, Madison, WI, 53705, USA.
2
Department of Biomedical Engineering, University of Wisconsin-Madison, 1111 Highland Ave., WIMR 5418, Madison, WI, 53705, USA.
3
Department of Material Science and Engineering, University of Wisconsin-Madison, 1111 Highland Ave., WIMR 5418, Madison, WI, 53705, USA.

Abstract

Microcarriers are scalable support surfaces for cell growth that enable high levels of expansion, and are particularly relevant for expansion of human mesenchymal stem cells (hMSCs). The goal of this study is to develop a poly(ethylene glycol) (PEG)-based microcarrier coating for hMSC expansion. Commercially available microcarriers do not offer customizability of microcarrier surface properties, including elastic modulus and surface cell adhesion ligands. The lab has previously demonstrated that tuning these material properties on PEG-based hydrogels can modulate important cellular growth characteristics, such as cell attachment and expansion, which are important in microcarrier-based culture. Eosin-Y is adsorbed to polystyrene microcarriers and used as a photoinitiator for thiol-ene polymerization under visible light. Resultant PEG coatings are over 100 µm thick and localized to microcarrier surfaces. This thickness is relevant for cells to react to mechanical properties of the hydrogel coating, and coated microcarriers support hMSC attachment and expansion. hMSC expansion is highly favorable on coated microcarriers in serum-free media, with doubling times under 25 h in the growth phase, and retained osteogenic and adipogenic differentiation capacity after culture on microcarriers. These microcarriers with defined, synthetic coatings enable tailorable surfaces for cell expansion that may be suitable for a variety of biomanufacturing applications.

KEYWORDS:

MSCs; biomanufacturing; cell therapies; microspheres; poly(ethylene glycol)

PMID:
28509413
PMCID:
PMC5607626
DOI:
10.1002/adhm.201700072
[Indexed for MEDLINE]
Free PMC Article

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