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IJAT Vol.10 No.1 pp. 55-61
doi: 10.20965/ijat.2016.p0055
(2016)

Paper:

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Stem Cell-Based Self-Assembled Tissues Cultured on a Nano-Periodic-Structured Surface Patterned Using Femtosecond Laser Processing

Hiromichi Fujie*1,*2, Kei Oya*3, Yuki Tani*1, Kenji Suzuki*4, and Norimasa Nakamura*5

*1Graduate School of System Design, Tokyo Metropolitan University
6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan

*2Research Institute for Science and Technology, Kogakuin University, Tokyo, Japan

*3Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, Tokyo, Japan

*4Department of Mechanical Systems Engineering, Kogakuin University, Tokyo, Japan

*5Graduate School of Medicine, Osaka University, Osaka, Japan

Received:
October 1, 2015
Accepted:
December 16, 2015
Online released:
January 4, 2016
Published:
January 5, 2016
Creative Commons License
Keywords:
biological tissue repair, mesenchymal stem cell (MSC), cell and tissue culture, stem-cell-based self-assembled tissue (scSAT), nano-periodic-structured surface, femtosecond laser processing
Abstract
The present study was conducted to determine the effects of a nano-periodic-structured surface on the morphological and mechanical properties of a stem-cell-based self-assembled tissue (scSAT) developed for biological tissue repair. Nano-periodic groove structures were patterned on a pure titanium surface using femtosecond laser processing, and the structure was replicated on polydimethylsiloxane (PDMS). The depth, periodic pitch, and surface roughness (Ra) of the PDMS grooves were 48 ± 21 nm, 522 ± 9 nm, and 17 ± 5 nm, respectively. Human synovial cells, including mesenchymal stem cells, were subjected to 4-time cell passage, and then cultured on the PDMS surface at a density of 4.0 × 105 cells/cm2 in a growth medium with 0.2 mM ascorbic acid 2-phosphate to produce scSATs (nano-scSAT). For comparison, some of the cells subjected to 4-time cell passage were cultured on either a flat PDMS substrate with 6 ± 1 nm of surface roughness (Ra) (flat-scSAT) or a commercially available cell culture plate of polystyrene (normal-scSAT), at a cell density identical to that in the nano-scSAT group. At 28 days of cell culture, the scSATs were gently detached from the culture plates and subjected to morphological observation and mechanical testing. Microscopic observation revealed that the nano-scSATs exhibited a dense tissue of cells and an extracellular matrix with an anisotropic structure, while the flat- and normal-scSATs exhibited a sparse and isotropic structure. The tangent modulus and tensile strength were significantly higher in the nano-scSATs than in the flat- and normal-scSATs. These results suggest that a nano-periodic-structured surface improves the morphological and mechanical properties of scSATs.
Cite this article as:
H. Fujie, K. Oya, Y. Tani, K. Suzuki, and N. Nakamura, “Stem Cell-Based Self-Assembled Tissues Cultured on a Nano-Periodic-Structured Surface Patterned Using Femtosecond Laser Processing,” Int. J. Automation Technol., Vol.10 No.1, pp. 55-61, 2016.
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