Kangnam Plastic Surgery Clinic

Seoul, South Korea

Kangnam Plastic Surgery Clinic

Seoul, South Korea
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Woo C.H.,Hanyang University | Choi Y.C.,Hanyang University | Choi J.S.,Hanyang University | Lee H.Y.,Kangnam Plastic Surgery Clinic | Cho Y.W.,Hanyang University
Journal of Biomaterials Science, Polymer Edition | Year: 2015

We designed bilayer composites composed of an upper layer of titanium dioxide (TiO2)-incorporated chitosan membrane and a sub-layer of human adipose-derived extracellular matrix (ECM) sheet as a wound dressing for full-thickness wound healing. The dense and fibrous top layer, which aims to protect the wound from bacterial infection, was prepared by electrospinning of chitosan solution followed by immersion in TiO2 solution. The sponge-like sub-layer, which aims to promote new tissue regeneration, was prepared with acellular ECM derived from human adipose tissue. Using a modified drop plate method, there was a 33.9 and 69.6% reduction in viable Escherichia coli and Staphylococcus aureus on the bilayer composite, respectively. In an in vivo experiment using rats, the bilayer composites exhibited good biocompatibility and provided proper physicochemical and compositional cues at the wound site. Changes in wound size and histological examination of full-thickness wounds showed that the bilayer composites induced faster regeneration of granulation tissue and epidermis with less scar formation, than control wounds. Overall results suggest that the TiO2-incorporated chitosan/ECM bilayer composite can be a suitable candidate as a wound dressing, with an excellent inhibition of bacterial penetration and wound healing acceleration effects. © 2015 © 2015 Taylor & Francis.

Choi J.S.,Hanyang University | Kim B.S.,Hanyang University | Kim J.D.,Hanyang University | Choi Y.C.,Hanyang University | And 2 more authors.
Tissue Engineering - Part A | Year: 2012

Extracellular matrix (ECM) secreted from the resident cell of tissue is an ideal biomaterial evolved by nature. Cartilage is also built from well-organized ECM components in a gel-like structure with a high collagen and proteoglycan content. Here, we explored cartilage tissue engineering using ECM scaffolds seeded with stem cells. Both scaffolds and stem cells were isolated from human adipose tissue, which is abundant and easily harvested in the human body. The human ECM scaffolds contained various endogenous bioactive factors, including transforming growth factor-beta1 (TGF-β1, 8782±4989 pg/g, dry ECM), insulin growth factor-1 (13319±1388 pg/g, dry ECM), basic fibroblast growth factor (82373±9572 pg/g, dry ECM), and vascular endothelial growth factor (25647±2749 pg/g, dry ECM). A composite of ECM and stem cells was prepared and cultured in chondrogenic medium (with 10 ng/mL TGF-β1 or not) for 45 days. The volumes and weights of the composites increased during culture and the surface gradually became smooth. Cell viability remained high throughout the 45 days of in vitro culture. Composites showed the formation of cartilage-like tissue with the synthesis of cartilage-specific proteins such as collagen and glycosaminoglycan. Important chondrogenic markers were expressed including Sox-9, aggrecan, and collagen type II and XI. These results demonstrate that a cell/ECM composite containing endogenous bioactive factors could provide biochemical cues for the promotion of cartilage formation. © 2012 Mary Ann Liebert, Inc.

Choi J.S.,Hanyang University | Choi Y.C.,Hanyang University | Kim J.D.,Hanyang University | Kim E.J.,Hanyang University | And 4 more authors.
Macromolecular Research | Year: 2014

Extracellular matrices (ECMs), isolated through decellularization of mammalian tissues, have been successfully used in a variety of tissue engineering and regenerative medicine applications. The composition and spatial structure of ECMs provide not only specific instructive cues for the growth, migration, and differentiation of various cells in vitro, but afford ideal substrates for in vivo tissue reconstruction. Adipose tissue, which is the most prevalent and expendable tissue in the body and can be harvested in large quantities with minimal morbidity, has received much attention as a rich source of ECMs. Recent studies have designed different processes to isolate intact ECMs from adipose tissue and have fabricated various three-dimensional (3-D) tissue engineering scaffolds such as microparticles, powders, sponges, sheets, and hydrogels for use in regenerative medicine, particularly for patients requiring soft tissue regeneration. Indeed, because of the abundance of ECM components within adipose tissue, combined with the relative ease of large tissue harvesting, adipose tissue is a valuable resource in tissue regeneration therapy, encompassing autotransplantation, allotransplantation, and xenotransplantion. We briefly review extraction and decellularization techniques of ECMs from adipose tissue, biological characterization and fabrication of ECM-based tissue engineering scaffolds, and their use in soft tissue engineering. © 2014, The Polymer Society of Korea and Springer Sciene+Business Media Dordrecht.

Choi J.S.,Hanyang University | Kim B.S.,Hanyang University | Kim J.Y.,Kangnam Plastic Surgery Clinic | Kim J.D.,Hanyang University | And 5 more authors.
Journal of Biomedical Materials Research - Part A | Year: 2011

Decellularized tissues composed of extracellular matrix (ECM) have been clinically used to support the regeneration of various human tissues and organs. Most decellularized tissues so far have been derived from animals or cadavers. Therefore, despite the many advantages of decellularized tissue, there are concerns about the potential for immunogenicity and the possible presence of infectious agents. Herein, we present a biomaterial composed of ECM derived from human adipose tissue, the most prevalent, expendable, and safely harvested tissue in the human body. The ECM was extracted by successive physical, chemical, and enzymatic treatments of human adipose tissue isolated by liposuction. Cellular components including nucleic acids were effectively removed without significant disruption of the morphology or structure of the ECM. Major ECM components were quantified, including acid/pepsin-soluble collagen, sulfated glycosaminoglycan (GAG), and soluble elastin. In an in vivo experiment using mice, the decellularized ECM graft exhibited good compatibility to surrounding tissues. Overall results suggest that the decellularized ECM containing biological and chemical cues of native human ECM could be an ideal scaffold material not only for autologous but also for allograft tissue engineering. © 2011 Wiley Periodicals, Inc.

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