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Patterned Thermoresponsive Microgel Surfaces to Control Cell Detachment

Author:
Xia, Yongqing  Tang, Ying  He, Xinlong  Pan, Fang  Li, Zonyi  Xu, Hai  Lu, Jian Ren  


Journal:
BIOMACROMOLECULES


Issue Date:
2016


Abstract(summary):

The aim of this work is to examine how adhered individual cells could detach from the patterned, discontinuous thermoresponsive coating substrate and how different patterns in the form of thermoresponsive squares and gaps would affect cell detachment. Microgels prepared from copolymerization of N-isopropylacrylamide and styrene (pNIPAAmSt) were spin-coated on polyethylenimine (PEI) precoated glass coverslips to form a uniform microgel monolayer; then a surface-moisturized PMDS stamp was used to contact the microgel monolayer at room temperature. The thin layer of water on the PDMS stamp surface worked as an ink to penetrate the microgels so that any microgels in direct contact with the wet stamp surface became swollen and could be peeled away, while uncontacted microgels formed patterns. Using this method, various patterns with different thermoisland diameters and gaps could be fabricated. NIH3T3 fibroblast cells were then cultured on these patterns to study their detachment behavior. It was found that cells could detach not only from these discontinuous thermoresponsive coatings, but also from the patterned surfaces with the thermoresponsive area being as low as 20% of the cell spread area.


Page:
572---579


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