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Thermoresponsive microgel coatings as versatile functional compounds for novel cell manipulation tools

Zugehörigkeit
Fraunhofer-Institute for Cell Therapy and Immunology, Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
Uhlig, Katja;
Zugehörigkeit
GeSiM mbH, Großerkmannsdorf, Germany
Wegener, Thomas;
Zugehörigkeit
Department of Physical and Biophysical Chemistry (PC III), Bielefeld University, Bielefeld, Germany
Hertle, Yvonne;
Zugehörigkeit
Department of Physical and Biophysical Chemistry (PC III), Bielefeld University, Bielefeld, Germany
Bookhold, Johannes;
Zugehörigkeit
Fraunhofer-Institute for Cell Therapy and Immunology, Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
Jaeger, Magnus;
Zugehörigkeit
Department of Physical and Biophysical Chemistry (PC III), Bielefeld University, Bielefeld, Germany
Hellweg, Thomas;
Zugehörigkeit
Leibniz Institute for Polymer Research Dresden, Institute of Physical Chemistry and Polymer Physics, Dresden, Germany
Fery, Andreas;
Zugehörigkeit
Fraunhofer-Institute for Cell Therapy and Immunology, Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
Duschl, Claus

For the effective use of live cells in biomedicine as in vitro test systems or in biotechnology, non-invasive cell processing and characterisation are key elements. Thermoresponsive polymer coatings have been demonstrated to be highly beneficial for controlling the interaction of adherent cells through their cultivation support. However, the widespread application of these coatings is hampered by limitations in their adaptability to different cell types and because the full range of applications has not yet been fully explored. In the work presented here, we address these issues by focusing on three different aspects. With regard to the first aspect, by using well-defined laminar flow in a microchannel, a highly controllable and reproducible shear force can be applied to adherent cells. Employing this tool, we demonstrate that cells can be non-invasively detached from a support using a defined shear flow. The second aspect relates to the recent development of simple methods for patterning thermoresponsive coatings. Here, we show how such patterned coatings can be used for improving the handling and reliability of a wound-healing assay. Two pattern geometries are tested using mouse fibroblasts and CHO cells. In terms of the third aspect, the adhesiveness of cells depends on the cell type. Standard thermoresponsive coatings are not functional for all types of cells. By coadsorbing charged nanoparticles and thermoresponsive microgels, it is demonstrated that the adhesion and detachment behaviour of cells on such coatings can be modulated.

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