title: [The experimental study of biomimetic artificial cartilage fabrication in vitro and ectopic chondrogenesis in vivo].
abstract: Tri-dimensional poly (DL-lactic-co-glycolic acid) (PLGA) scaffolds were fabricated using a rapid prototyping (RP) technique and the gene of human bone morphogenetic protein 2 (hBMP-2) was transferred into rabbit bone marrow stromal cells (MSCs) via recombinant adeno-associated virus vectors (rAAV-hBMP-2). Thirty-two PLGA scaffolds, size (4 mm X 4 mm X 4 mm), were coated with collagen type I and equally divided into 2 groups. In group A, each scaffold was loaded with 2 X 10(4) hBMP-2 (+) MSCs to establish a hBMP-2 (+) MSCs/PLGA composite. In group B, each scaffold was loaded with 2 X 10(4) hBMP-2 (-) MSCs to establish a hBMP-2 (-) MSCs/PLGA composite. The composites in both groups were cultured for subcutaneous implantation in nude mice. All animals were killed 30 days after implantation and the differentiation of composites was evaluated. As a result, MSCs infected with rAAV-hBMP-2 efficiently expressed hBMP-2 protein. RP-based PLGA scaffolds had ideal microarchitecture. The diameters of macropore and micropore of the scaffolds were 300 microm and 3-5 microm, respectively. At 3-5 days after culture, a number of seeding cells well grew on the scaffolds of both groups. The composites in group A had chondrogenesis ability in vivo and the expression of collagen type II was positive. In group B, however, only polymers and fiber tissues were predominantly found. The percentage of polymer remnant area was significantly lower in group A than in group B (P<0.01). Our results therefore indicate that RP-based PLGA scaffolds efficiently coated with collagen type I have good biocompatibility with hBMP-2 (+) MSCs and the techniques developed in this study may favor cartilage tissue engineering.
authors.affiliation: Institute of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Ma
authors.forename: Yunyu
authors.initials: Y
authors.lastname: Hu
authors.forename: Yongnianz
authors.initials: Y
authors.lastname: Yan
authors.forename: Zhou
authors.initials: Z
authors.lastname: Xiong
authors.forename: Rong
authors.initials: R
authors.lastname: Lü
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Xinzhi
authors.initials: X
authors.lastname: Xu
authors.forename: Dan
authors.initials: D
authors.lastname: Li
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D001854:Bone Marrow Cells / Q000166:cytology; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000235:genetics; D002454:Cell Differentiation; D002478:Cells, Cultured; D020219:Chondrogenesis; D048091:Guided Tissue Regeneration / Q000379:methods; D006801:Humans; D020007:Implants, Experimental; D019344:Lactic Acid; D008297:Male; D051379:Mice; D008819:Mice, Nude; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011817:Rabbits; D017154:Stromal Cells / Q000166:cytology; D023822:Tissue Engineering / Q000379:methods; D014162:Transfection; D016212:Transforming Growth Factor beta / Q000235:genetics
chemical_list: C525718:BMP2 protein, human; D001672:Biocompatible Materials; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D011108:Polymers; D016212:Transforming Growth Factor beta; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid