Abstract
Access to unlimited numbers of live human neurons derived from stem cells offers unique opportunities for in vitro modeling of neural development, disease-related cellular phenotypes, and drug testing and discovery. However, to develop informative cellular in vitro assays, it is important to consider the relevant in vivo environment of neural tissues. Biomimetic 3D scaffolds are tools to culture human neurons under defined mechanical and physico-chemical properties providing an interconnected porous structure that may potentially enable a higher or more complex organization than traditional two-dimensional monolayer conditions. It is known that even minor variations in the internal geometry and mechanical properties of 3D scaffolds can impact cell behavior including survival, growth, and cell fate choice. In this report, we describe the design and engineering of 3D synthetic polyethylene glycol (PEG)-based and biodegradable gelatin-based scaffolds generated by a free form fabrication technique with precise internal geometry and elastic stiffnesses. We show that human neurons, derived from human embryonic stem (hESC) cells, are able to adhere to these scaffolds and form organoid structures that extend in three dimensions as demonstrated by confocal and electron microscopy. Future refinements of scaffold structure, size and surface chemistries may facilitate long term experiments and designing clinically applicable bioassays.
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Acknowledgements
The project described was supported in part by Award Number R01EB012597 from the National Institute of Biomedical Imaging And Bioengineering and grants (CMMI-1130894, CMMI-1120795) from the National Science Foundation. Thanks to Joseph Russo of Sanford-Burnham Imaging Core Facility for technical expertise. BT is funded by UCSD Dept. of Psychiatry NIH T32.
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Pranav Soman and Brian T. D. Tobe contributed equally to this work.
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Soman, P., Tobe, B.T.D., Lee, J.W. et al. Three-dimensional scaffolding to investigate neuronal derivatives of human embryonic stem cells. Biomed Microdevices 14, 829–838 (2012). https://doi.org/10.1007/s10544-012-9662-7
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DOI: https://doi.org/10.1007/s10544-012-9662-7