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A Combinational Effect of “Bulk” and “Surface” Shape‐Memory Transitions on the Regulation of Cell Alignment
Author(s) -
Uto Koichiro,
Aoyagi Takao,
DeForest Cole A.,
Hoffman Allan S.,
Ebara Mitsuhiro
Publication year - 2017
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.201601439
Subject(s) - shape memory alloy , materials science , strain (injury) , curse of dimensionality , shape memory polymer , biophysics , cell , process (computing) , surface (topology) , deformation (meteorology) , biological system , composite material , computer science , geometry , chemistry , anatomy , artificial intelligence , biology , biochemistry , mathematics , operating system
A novel shape‐memory cell culture platform has been designed that is capable of simultaneously tuning surface topography and dimensionality to manipulate cell alignment. By crosslinking poly(ε‐caprolactone) (PCL) macromonomers of precisely designed nanoarchitectures, a shape‐memory PCL with switching temperature near body temperature is successfully prepared. The temporary strain‐fixed PCLs are prepared by processing through heating, stretching, and cooling about the switching temperature. Temporary nanowrinkles are also formed spontaneously during the strain‐fixing process with magnitudes that are dependent on the applied strain. The surface features completely transform from wrinkled to smooth upon shape‐memory activation over a narrow temperature range. Shape‐memory activation also triggers dimensional deformation in an initial fixed strain‐dependent manner. A dynamic cell‐orienting study demonstrates that surface topographical changes play a dominant role in cell alignment for samples with lower fixed strain, while dimensional changes play a dominant role in cell alignment for samples with higher fixed strain. The proposed shape‐memory cell culture platform will become a powerful tool to investigate the effects of spatiotemporally presented mechanostructural stimuli on cell fate.