title: In vivo bone formation from human embryonic stem cell-derived osteogenic cells in poly(d,l-lactic-co-glycolic acid)/hydroxyapatite composite scaffolds.
abstract: We have previously reported the efficient osteogenic differentiation of human embryonic stem cells (hESCs) by co-culture with primary human bone-derived cells (hPBDs) without the use of exogenous factors. In the present study, we explored whether osteogenic cells derived from hESCs (OC-hESCs) using the previously reported method would be capable of regenerating bone tissue in vivo. A three-dimensional porous poly(d,l-lactic-co-glycolic acid)/hydroxyapatite composite scaffold was used as a cell delivery vehicle. In vivo implantation of OC-hESC-seeded scaffolds showed significant bone formation in the subcutaneous sites of immunodeficient mice at 4 and 8 weeks after implantation (n=5 for each time point). Meanwhile, implantation of the control no cell-seeded scaffolds or human dermal fibroblast-seeded scaffolds did not show any new bone formation. In addition, the presence of BMP-2 (1 microg/scaffold) enhanced new bone tissue formation in terms of mineralization and the expression of bone-specific genetic markers. According to FISH analysis, implanted OC-hESCs remained in the regeneration sites, which suggested that the implanted cells participated in the formation of new bone. In conclusion, OC-hESCs successfully regenerated bone tissue upon in vivo implantation, and this regeneration can be further enhanced by the administration of BMP-2. These results suggest the clinical feasibility of OC-hESCs as a good alternative source of cells for bone regeneration.
authors.affiliation: Graduate School of Life Science, CHA Stem Cell Institute, Pochon CHA University, 606-16 Yoeksam 1-dong, Gangnam-gu, Seoul 135-081, Republic of Korea.
authors.forename: Sinae
authors.initials: S
authors.lastname: Kim
authors.forename: Sang-Soo
authors.initials: SS
authors.lastname: Kim
authors.forename: Soo-Hong
authors.initials: SH
authors.lastname: Lee
authors.forename: Seong
authors.initials: S
authors.lastname: Eun Ahn
authors.forename: So-Jung
authors.initials: SJ
authors.lastname: Gwak
authors.forename: Joon-Ho
authors.initials: JH
authors.lastname: Song
authors.forename: Byung-Soo
authors.initials: BS
authors.lastname: Kim
authors.forename: Hyung-Min
authors.initials: HM
authors.lastname: Chung
mesh_terms: D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000737:chemistry / Q000494:pharmacology; D001861:Bone Regeneration / Q000187:drug effects / Q000502:physiology*; D002113:Calcification, Physiologic / Q000187:drug effects; D002454:Cell Differentiation; D002460:Cell Line; D002478:Cells, Cultured; D018920:Coculture Techniques / Q000379:methods; D024042:Collagen Type I / Q000235:genetics / Q000378:metabolism; D017886:Durapatite / Q000737:chemistry*; D053595:Embryonic Stem Cells / Q000166:cytology*; D005260:Female; D015870:Gene Expression; D006016:Glycolates / Q000737:chemistry*; D006801:Humans; D058574:Integrin-Binding Sialoprotein; D019344:Lactic Acid; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000637:transplantation; D015675:Osteocalcin / Q000235:genetics / Q000378:metabolism; D053495:Osteopontin / Q000235:genetics; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D012795:Sialoglycoproteins / Q000235:genetics; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry*; D016212:Transforming Growth Factor beta / Q000737:chemistry / Q000494:pharmacology
chemical_list: C525718:BMP2 protein, human; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D024042:Collagen Type I; D006016:Glycolates; C546871:IBSP protein, human; C546872:Ibsp protein, mouse; D058574:Integrin-Binding Sialoprotein; D012795:Sialoglycoproteins; D016212:Transforming Growth Factor beta; D015675:Osteocalcin; D053495:Osteopontin; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D017886:Durapatite