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Cytoprotective Alginate/Polydopamine Core/Shell Microcapsules in Microbial Encapsulation
Kim, Beom Jin,Park, Taegyun,Moon, Hee Chul,Park, So‐,Young,Hong, Daewha,Ko, Eun Hyea,Kim, Ji Yup,Hong, Jong Wook,Han, Sang Woo,Kim, Yang‐,Gyun,Choi, Insung S. WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.52
<P><B>Abstract</B></P><P>Chemical encapsulation of microbes in threedimensional polymeric microcapsules promises various applications, such as cell therapy and biosensors, and provides a basic platform for studying microbial communications. However, the cytoprotection of microbes in the microcapsules against external aggressors has been a major challenge in the field of microbial microencapsulation, because ionotropic hydrogels widely used for microencapsulation swell uncontrollably, and are physicochemically labile. Herein, we developed a simple polydopamine coating for obtaining cytoprotective capability of the alginate capsule that encapsulated <I>Saccharomyces cerevisiae</I>. The resulting alginate/ polydopamine core/shell capsule was mechanically tough, prevented gel swelling and cell leakage, and increased resistance against enzymatic attack and UV‐C irradiation. We believe that this multifunctional core/shell structure will provide a practical tool for manipulating microorganisms inside the microcapsules.</P>
Cytoprotective Silica Coating of Individual Mammalian Cells through Bioinspired Silicification
Lee, Juno,Choi, Jinsu,Park, Ji Hun,Kim, Mi‐,Hee,Hong, Daewha,Cho, Hyeoncheol,Yang, Sung Ho,Choi, Insung S. WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.31
<P><B>Abstract</B></P><P>The cytoprotective coating of physicochemically labile mammalian cells with a durable material has potential applications in cell‐based sensors, cell therapy, and regenerative medicine, as well as providing a platform for fundamental single‐cell studies in cell biology. In this work, HeLa cells in suspension were individually coated with silica in a cytocompatible fashion through bioinspired silicification. The silica coating greatly enhanced the resistance of the HeLa cells to enzymatic attack by trypsin and the toxic compound poly(allylamine hydrochloride), while suppressing cell division in a controlled fashion. This bioinspired cytocompatible strategy for single‐cell coating was also applied to NIH 3T3 fibroblasts and Jurkat cells.</P>