Papers by Author: Dong June Chung

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Authors: Seung Eon Kim, Yong Taek Hyun, Dong June Chung, S.J. Heo, Jung Woog Shin, J.H. Lee
Abstract: Poly ε-caprolactone(PCL)/hydroxyapatite(HA) composite scaffolds were fabricated by particulate leaching and freeze drying routes with different HA content. Porosity was decreased with HA addition, while mean pore size was maintained at around porogen size regardless of HA content. Compressive modulus was increased with increasing HA content. In this study, the optimum content of HA was around 40% in weight against PCL to obtain the highest compressive modulus with keeping porosity above 85%. HA apparently enhanced proliferation of osteoblast-like MG63 cells in PCL/HA composite scaffolds. Typical adhesion, migration and aggregation procedure of MG63 cells were found on PCL, while spreading morphology only was found on HA even at the early stage of adhesion without migration or aggregation.
Authors: Hong Ki Bae, Chong Pyong Chung, Dong June Chung
Abstract: In this study, we find out the possibilities to make conduit for nerve regeneration using biodegradable polymers, which have enough mechanical strength in surgery. Cell adhesion (PC12) behaviors about various nerve conduits have not great difference compared to control. This is regarded due to specific structure of nerve conduits formed nano-fibers. In the case of PPD, we observed better phenotype of adhered cell than PLGA samples. Also, PPD-PLGA bi-layered nerve conduits were more effective than PLGA nerve conduit for in vitro evaluation.
Authors: Jong Hyun Ko, Ji Heung Kim, Dong June Chung
Abstract: The effects of various processing parameters of electro spinning such as concentration, applied voltage, distance from needle to collector on the morphology(especially fiber diameter) of nanofiber matrix was investigated in this study. We found out the concentration of polymer solution was the key parameter to control the fiber diameter. Such a difference on surface morphology of electro spun nanofiber matrix under various processing parameters will show the different behaviors on protein adsorption on the surface contacting with body fluid. Consequently, this results different cell motions on the matrix used on tissue engineering. To evaluate the adsorption of proteins on the surface of sheet type nanofiber matrix, matrix obtained by electro spinning were immersed in FITC labeled proteins solutions. And then, we confirmed adsorption of proteins using laser scanning confocal microscopy (LSCM). The quantitative analysis of adsorbed proteins was also investigated by UV spectroscopy.
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