Yeon I Woo

The biological activities of (1,3)-(1,6)-β-d-glucan and porous electrospun PLGA membranes containing β-glucan in human dermal fibroblasts and adipose tissue-derived stem cells

In this study, we investigated the possible roles of (1,3)-(1,6)-beta-d-glucan (beta-glucan) and porous electrospun poly-lactide-co-glycolide (PLGA) membranes containing beta-glucan for skin wound healing, especially their effect on adult human dermal fibroblast (aHDF) and adipose tissue-derived stem cell (ADSC) activation, proliferation, migration, collagen gel contraction and biological safety tests of the prepared membrane. This study demonstrated that beta-glucan and porous PLGA membranes containing beta-glucan have enhanced the cellular responses, proliferation and migration, of aHDFs and ADSCs and the result of a collagen gel contraction assay also revealed that collagen gels contract strongly after 4 h post-gelation incubation with beta-glucan. Furthermore, we confirmed that porous PLGA membranes containing beta-glucan are biologically safe for wound healing study. These results indicate that the porous PLGA membranes containing beta-glucan interacted favorably with the membrane and the topical administration of beta-glucan was useful in promoting wound healing. Therefore, our study suggests that beta-glucan and porous PLGA membranes containing beta-glucan may be useful as a material for enhancing wound healing.

Beneficial effects of microwave-induced argon plasma treatment on cellular behaviors of articular chondrocytes onto nanofibrous silk fibroin mesh

Silk fibroin scaffolds were examined as a biomaterial option for tissue-engineered cartilage-like tissue. In tissue engineering for cartilage repair using a scaffold, initial chondrocyte-material interactions are important for the following cell behaviors. In this study, the surface of nanofibrous silk fibroin (NSF) meshes was modified by a microwave-induced argon plasma treatment in order to improve the cytocompatibility of the meshes used as cartilaginous grafts. In addition, the effects of a plasma treatment on the cellular behavior of chondrocytes on NSF were examined. The plasma treatment resulted in an increase in the hydrophilicity of NSF meshes suggesting that the cytocompatibility of the mesh might be improved. Furthermore, the human articular chondrocytes showed higher viability on the surface-modified NSF meshes. These results suggest that the surface modification of NSF meshes by plasma can enhance the cellular behavior of chondrocytes and may be used in tissue engineering.

Application of Hydrogen Peroxide Gas Plasma Method for Porous Polyurethane Sterilization

Tissue-engineering must be either manufactured aseptically or sterilized after processing. To extend protection of medical devices against microbial contamination, various sterilization methods have been suggested. Hydrogen peroxide gas plasma sterilization has been applied in hospitals worldwide for almost a decade. In this study, we investigated the sterilization efficacy of hydrogen peroxide gas plasma sterilizer with porous polyurethane sample. The result is suggested that hydrogen peroxide gas plasma can be applicable to the sterilization of polymer scaffold for tissue engineering materials.

Growth of Smooth Muscle Cell and Endothelial Cell on PLGA Film containing EGCG

Poly (D,L-latic-co-glycolic acid) (PLGA) has been used as the artificial scaffold for blood vessel formation. In order to hinder smooth muscle cell (SMC) angiogenesis, new scaffold design method of loading Epigallocatechin 3-O-gallate (EGCG) on PLGA film was introduced. PLGA and EGCG were dissolved in acetone and film-shape scaffold was manufactured. Antiangiogenetic effect of EGCG released on scaffold was analyzed for SMC and human umbilical vein endothelial cell (HUVEC) and method for selective inhibition from the difference of growth of SMC and HUVEC was suggested.

Effects Of (1→3), (1→6)-β-D-Glucan Behavior in Human Dermal Fibroblast Cells under Serum Starvation

Glucans have been reported to stimulate immunity and to promote wound healing. Adult human dermal fibroblast (aHDF) cultured in serum free (serum-starvation). Proliferation of aHDF was measured at various concentrations of β-glucan by MTT assay, and migration was observed for 36h on microscope. The result of fibroblast bioassay, β-glucan had positive influence. In this study, the direct effects of β-glucan on proliferation and migration of human dermal fibroblasts were examined in vitro. That means β-D-glucan has the effect to enhance proliferation and aHDF migration speed, and has the potential as a wound healing agent.

Toxicity Test of Wound Covering Material on Animals

Adhesions are abnormal attachments between tissues, caused by an inflammatory stimulus or trauma. It was generally used physical barriers and various agents to prevent from adhesions formation. In this study, we made an experiment on animals with wound covering material of substance to prevent tissue adhesion. It was performed in sub-acute toxicity, and tested local effects after implantation.