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Visible-Light-Responsive Surfaces for Efficient, Noninvasive Cell Sheet Harvesting.
ACS Applied Materials & Interfaces 2017 August 31
Effective regulation of cell-surface interactions is critical for regenerative medicine and other cell-based therapies. Herein, visible-light-induced cell sheet harvesting based on silicon wafers with a p/n junction [Si(p/n)] is introduced. Cell sheets could quickly detach from the Si(p/n) surface after 10 min of visible-light illumination with maintained cell viability and functions. It is found that preadsorbed proteins on the Si(p/n) surface like BSA and collagen-I show light-induced desorption behaviors. Molecular dynamics simulation also indicates that long-range force caused by the photovoltaic effect of Si(p/n) under visible-light illumination plays a key role in triggering the release of the preadsorbed protein. It is suggested that such protein desorption behavior mediated by the photovoltaic effect is responsible for cell release. This work not only shows promising potential for cell sheet harvesting, but also provides new insights into protein-material interactions.
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