Letter abstract
Nature Nanotechnology 3, 671 - 675 (2008)
Published online: 28 September 2008 | doi:10.1038/nnano.2008.270
Subject Categories: Nanomaterials | Nanoparticles | Structural properties | Synthesis and processing
A thixotropic nanocomposite gel for three-dimensional cell culture
Y. Shona Pek1, Andrew C. A. Wan1, Asha Shekaran1, Lang Zhuo1 & Jackie Y. Ying1
Abstract
Thixotropic materials, which become less viscous under stress and return to their original state when stress is removed1, have been used to deliver gel–cell constructs2 and therapeutic agents3. Here we show that a polymer–silica nanocomposite thixotropic gel can be used as a three-dimensional cell culture material. The gel liquefies when vortexed—allowing cells and biological components to be added—and resolidifies to trap the components when the shear force from spinning is removed. Good permeability of nutrients and gases through the gel allows various cell types to proliferate and be viable for up to three weeks. Human mesenchymal stem cells cultured in stiffer gels developed bone-like behaviour, showing that the rheological properties of the gel can control cell differentiation. No enzymatic4, chemical5, 6, or photo-crosslinking7, 8, 9, changes in ionic strength10, 11, 12, 13, 14 or temperature15, 16 are required to form or liquefy the gel, offering a way to sub-culture cells without using trypsin—a protease commonly used in traditional cell culture techniques.
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, 138669 Singapore
Correspondence to: Jackie Y. Ying1 e-mail: jyying@ibn.a-star.edu.sg
Correspondence to: Andrew C. A. Wan1 e-mail: awan@ibn.a-star.edu.sg
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