title: Collagen I gel can facilitate homogenous bone formation of adipose-derived stem cells in PLGA-beta-TCP scaffold.
abstract: Cell-based tissue engineering is thought to be a new therapy for treatment of bone defects and nonunions after trauma and tumor resection. In this study, we explore the in vitro and in vivo osteogenesis of a novel biomimetic construct fabricated by using collagen I gel to suspend rabbit adipose-derived stem cells (rASCs) into a porous poly(lactic-co-glycolic)acid-beta-tricalcium phosphate (PLGA-beta-TCP) scaffold (rASCs-COL/PLGA-beta-TCP). In vitro and in vivo studies of the rASCs-COL/PLGA-beta-TCP composite (group A) were carried out compared with the single combination of rASCs and PLGA-beta-TCP (rASCs/PLGA-beta-TCP; group B), the combination of acellular collagen I gel and PLGA-beta-TCP (COL/PLGA-beta-TCP; group C), and the PLGA-beta-TCP scaffold (group D). Composites of different groups were cultured in vitro for 2 weeks in osteogenic medium and then implanted into the autologous muscular intervals for 8 weeks. After 2 weeks of in vitro culture, alkaline phosphatase activity and extracellular matrix mineralization in group A were significantly higher than in group B (p < 0.01, n = 4). In vivo osteogenesis was evaluated by radiographic and histological analyses. The calcification level was radiographically evident in group A, whereas no apparent calcification was observed in groups B, C and D (n = 4). In group A, woven bone with a trabecular structure was formed, while in group B, only osteoid tissue was observed. Meanwhile, the bone-forming area in group A was significantly higher than in group B (p < 0.01, n = 4). No bone formation was observed in groups C or D (n = 4). In conclusion, by using collagen I gel to suspend rASCs into porous PLGA-beta-TCP scaffold, osteogenic differentiation of rASCs can be improved and homogeneous bone tissue can be successfully formed in vivo.
authors.affiliation: Institute of Orthopaedics, Xijing Hospital,Fourth Military Medical University, Xi'an, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Hao
authors.forename: Yun-Yu
authors.initials: YY
authors.lastname: Hu
authors.forename: Yi-Yong
authors.initials: YY
authors.lastname: Wei
authors.forename: Long
authors.initials: L
authors.lastname: Pang
authors.forename: Rong
authors.initials: R
authors.lastname: Lv
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Bai
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Xiong
authors.forename: Ming
authors.initials: M
authors.lastname: Jiang
mesh_terms: D000273:Adipose Tissue / Q000166:cytology* / Q000637:transplantation; D000818:Animals; D001672:Biocompatible Materials; D002130:Calcium Phosphates; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D024042:Collagen Type I / Q000648:ultrastructure; D005782:Gels; D019344:Lactic Acid; D010012:Osteogenesis / Q000502:physiology*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011817:Rabbits; D033581:Stem Cell Transplantation; D013234:Stem Cells / Q000166:cytology* / Q000648:ultrastructure; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds
chemical_list: D001672:Biocompatible Materials; D002130:Calcium Phosphates; D024042:Collagen Type I; D005782:Gels; D011108:Polymers; C485817:beta-tricalcium phosphate; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid