title: An implantable electrical bioreactor for enhancement of cell viability.
abstract: Low survival of injected cells which are prepared by ex-vivo culture is main obstacle in cell-based tissue regeneration. To elevate cell adaptation, we designed an implantable electrical bioreactor where human mesenchymal stromal cells (hMSCs) can be cultured and stimulated electrically. Bioreactor was composed of biocompatible cylindrical Teflon body containing a flexible polyimide electrode and implantable stimulator. The Teflon body has about 300 holes with a diameter of 300 um for effective nutrients supply inside the bioreactor and has a length of 17 mm and a diameter of 8mm for implantation. After hMSCs seeded on the collagen sponge that serves as scaffold to form a bone tissue graft, they are cultured in the bioreactor with biphasic electric current (BEC) stimulation. BEC stimulation with amplitude of 20/40 uA, duration of 100 us and a frequency of 100 Hz was applied for one week in the early stage of cultivation. Subsequently, after hMSCS were cultured for another week without electrical stimulation, cell response such as cell proliferation, cell attachment and gene expression are evaluated. In vitro and In vivo culture of hMSCs showed 19% and 22% increase in cell proliferation at stimulated groups, compared to unstimulated control. The expression of type I collagen increased significantly at stimulated group. These results suggest that the usage of implantable electrical bioreactor can be a good strategy to enhance the efficiency of stem cell-based tissue engineering.
authors.affiliation: School of Electrical Engineering and Computer Science, Seoul National University, Seoul, Korea. char181818@gmail.com
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Tae Hyung
authors.initials: TH
authors.lastname: Lee
authors.forename: Yun Mi
authors.initials: YM
authors.lastname: Song
authors.forename: In Sook
authors.initials: IS
authors.lastname: Kim
authors.forename: Tae Hyung
authors.initials: TH
authors.lastname: Cho
authors.forename: Sune Jung
authors.initials: SJ
authors.lastname: Hwang
authors.forename: Sung June
authors.initials: SJ
authors.lastname: Kim
mesh_terms: D019149:Bioreactors; D049109:Cell Proliferation; D004560:Electricity; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology*