title: Enhancement of in vivo bone regeneration efficacy of osteogenically undifferentiated human cord blood mesenchymal stem cells.
abstract: We hypothesized that bone morphogenetic protein-2 (BMP-2) would significantly enhance in vivo bone formation efficacy of osteogenically undifferentiated human cord blood mesenchymal stem cells (hCBMSCs). To test this hypothesis, poly(lactic-co-glycolic acid)/hydroxyapatite (PLGA/HA) scaffolds (group 1), BMP-2-loaded PLGA/HA scaffolds (group 2), undifferentiated hCBMSCs seeded on PLGA/HA scaffolds (group 3), undifferentiated hCBMSCs seeded on BMP-2-loaded PLGA/HA scaffolds (group 4), and osteogenically differentiated hCBMSCs seeded on PLGA/HA scaffolds (group 5) were implanted into dorsal, subcutaneous spaces of athymic mice for 8 weeks. Histological analysis showed that group 4 exhibited the largest bone formation area. RT-PCR analysis showed that human mRNA expression of osteoblastic markers such as ALP and osteocalcin in group 4 was higher than that of the other groups. Mouse osteoblastic markers of the host cells in the implants were also expressed more in group 4 than in the other groups. This study demonstrated that hCBMSCs that were not differentiated osteogenically in vitro prior to transplantation regenerate bone negligibly in vivo and that transplantation of osteogenically undifferentiated hCBMSCs with BMP-2 delivery results in much more extensive bone formation in vivo than that of undifferentiated or osteogenically differentiated hCBMSCs.
authors.affiliation: Department of Bioengineering, Hanyang University, Seoul 133-791, Korea.
authors.forename: Jin Muk
authors.initials: JM
authors.lastname: Kang
authors.forename: Sun-Woong
authors.initials: SW
authors.lastname: Kang
authors.forename: Wan-Geun
authors.initials: WG
authors.lastname: La
authors.forename: Yoon-Sun
authors.initials: YS
authors.lastname: Yang
authors.forename: Byung-Soo
authors.initials: BS
authors.lastname: Kim
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism; D015415:Biomarkers / Q000378:metabolism; D001861:Bone Regeneration / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology*; D002478:Cells, Cultured; D017886:Durapatite / Q000737:chemistry / Q000378:metabolism; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D006801:Humans; D020007:Implants, Experimental; D019344:Lactic Acid / Q000737:chemistry / Q000378:metabolism; D008422:Materials Testing; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000502:physiology*; D051379:Mice; D008819:Mice, Nude; D010006:Osteoblasts / Q000378:metabolism; D010012:Osteogenesis / Q000502:physiology; D011100:Polyglycolic Acid / Q000737:chemistry / Q000378:metabolism; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013499:Surface Properties; D054457:Tissue Scaffolds / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D015415:Biomarkers; D012333:RNA, Messenger; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D017886:Durapatite