title: A tissue-engineered bioabsorbable nerve conduit created by three-dimensional culture of induced pluripotent stem cell-derived neurospheres.
abstract: We previously reported a bioabsorbable nerve conduit coated with Schwann cells for the treatment of peripheral nerve defects. Since there have been dramatic developments in induced pluripotent stem (iPS) cells in recent years, the purpose of the present study was to create a tissue-engineered nerve conduit coated with iPS cell-derived neurospheres. Such a conduit was constructed by three-dimensional (3D)-culture of these cells using a bioabsorbable polymer conduit as a scaffold. The nerve conduit was composed of a mesh of poly L-lactide, and a porous sponge of 50% poly L-lactide and 50% poly ε-caprolactone. The primary and secondary neurospheres (PNS and SNS, respectively) induced from iPS cells were suspended in individual conduits. The conduits were incubated for 7 or 14 days in vitro and then evaluated using immunohistochemistry. All of the 7- and 14-day differentiated PNS and SNS were observed to have adhered to the inner surface of the conduits and to have migrated into the inner porous sponge. The engrafted cells were positive for anti-Tuj1, -S-100 and -GFAP antibodies, indicating that their pluripotent ability to form neural or glial cells was maintained. These findings indicate the feasibility of creating nerve conduits coated with a 3D-culture of iPS cell-derived neurospheres for the treatment of peripheral nerve defects.
authors.affiliation: Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, Japan. t-uemura@med.osaka-cu.ac.jp
authors.forename: Takuya
authors.initials: T
authors.lastname: Uemura
authors.forename: Kiyohito
authors.initials: K
authors.lastname: Takamatsu
authors.forename: Mikinori
authors.initials: M
authors.lastname: Ikeda
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Okada
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kazuki
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Ikada
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Nakamura
mesh_terms: D020341:Absorbable Implants; D018929:Cell Culture Techniques / Q000295:instrumentation / Q000379:methods; D002454:Cell Differentiation / Q000502:physiology; D002478:Cells, Cultured; D048091:Guided Tissue Regeneration / Q000295:instrumentation*; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000166:cytology / Q000502:physiology*; D009416:Nerve Regeneration / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000166:cytology* / Q000502:physiology; D011108:Polymers / Q000737:chemistry / Q000494:pharmacology; D016062:Porosity; D018874:Spheroids, Cellular / Q000166:cytology / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry
chemical_list: D011108:Polymers