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전인동,신흥수,박경민,이동윤,박기동 한국고분자학회 2011 Macromolecular Research Vol.19 No.9
The development of an artificial matrix is critical as both a substrate to control the cell behavior and as a tool for examining the roles of cellular microenvironment in biology. This study developed cell-interactive hydrogels containing a Arg-Gly-Asp (RGD) peptide, cross-linked via bio-inspired enzymatic processes using H2O2 and horseradish peroxidase (HRP) as the initiators and examined how they controlled myoblast functions. The cell-interactive hydrogels modulated the adhesion and proliferation of myoblast, depending on the peptide density. Furthermore,the expression of focal adhesion proteins and myogenic differentiation were up-regulated significantly in myoblasts cultured on peptide-incorporated hydrogels. Therefore, the novel hydrogel system can be used to regulate the cell function for many tissue engineering applications.
임장수,전인동,이유빈,김은미,신동석,전호정,박한수,신흥수 한국고분자학회 2016 Macromolecular Research Vol.24 No.6
Although many efforts have been made to engineer cell sheets with anisotropic patterns, current techniques still exhibit several shortcomings including uncontrolled harvest time and deformation of pattern by contraction. In this study, we report a simple method to harvest a cell sheet with a striated structure of extracellular matrix (ECM) and myoblasts using a thermosensitive hydrogel micropatterned with different sizes (25 and 80 μm). The hydrogel supported the formation of a confluent monolayer of myoblasts with aligned morphology. When the temperature was reduced from 37 to 4 oC, the size of the hydrogel increased by approximately 1.2-fold within 10 min. In response to this change, a cell sheet was harvested and could be transferred to the desirable substrate through conformal contact between the hydrogel and target. We further examined the effect of pattern size on alignment of ECM/ cell assembly by fast Fourier transform (FFT) analysis of fluorescently stained stress fibers and ECM proteins within the harvested cell sheet. The cell sheet maintained alignment of confluent myoblasts after being harvested to the substrate. In addition, the topologic patterns also promoted formation of aligned myotube on the harvested cell sheet, which was important for muscle tissue regeneration. However, the pattern size appeared to have no influence on alignment of cells on the cell sheet. Finally, a bi-layered structure was fabricated in which each layer was stacked with aligned direction on the cell sheet being perpendicularly assembled. Collectively, our platform could be used for rapid harvest of cell sheets with aligned architecture of ECM/cell, which can be applied to fabrication of welldefined 3D tissue for tissue engineering.