title: Three-dimensional polycaprolactone-hydroxyapatite scaffolds combined with bone marrow cells for cartilage tissue engineering.
abstract: The goal of this study was to investigate the chondrogenic potential of three-dimensional polycaprolactone-hydroxyapatite (PCL-HA) scaffolds loaded with bone marrow cells in vitro and the effect of PCL-HA scaffolds on osteochondral repair in vivo. Here, bone marrow was added to the prepared PCL-HA scaffolds and cultured in chondrogenic medium for 10 weeks. Osteochondral defects were created in the trochlear groove of 29 knees in 17 New Zealand white rabbits, which were then divided into four groups that underwent: implantation of PCL-HA scaffolds (left knee, n = 17; Group 1), microfracture (right knee, n = 6; Group 2), autologous osteochondral transplantation (right knee, n = 6; Group 3), and no treatment (right knee, n = 5; Control). Extracellular matrix produced by bone marrow cells covered the surface and filled the pores of PCL-HA scaffolds after 10 weeks in culture. Moreover, many cell-laden cartilage lacunae were observed, and cartilage matrix was concentrated in the PCL-HA scaffolds. After a 12-week repair period, Group 1 showed excellent vertical and lateral integration with host bone, but incomplete cartilage regeneration and matrix accumulation. An uneven surface of regenerated cartilage and reduced distribution of cartilage matrix were observed in Group 2. In addition, abnormal bone growth and unstable integration between repaired and host tissues were detected. For Group 3, the integration between transplanted and host cartilage was interrupted. Our findings indicate that the PCL-HA scaffolds loaded with bone marrow cells improved chondrogenesis in vitro and implantation of PCL-HA scaffolds for osteochondral repairenhanced integration with host bone. However, cartilage regeneration remained unsatisfactory. The addition of trophic factors or the use of precultured cell-PCL-HA constructs for accelerated osteochondral repair requires further investigation.
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China China-Korea United Cell Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Wei
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China China-Korea United Cell Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Qingqiang
authors.initials: Q
authors.lastname: Yao
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China China-Korea United Cell Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Fengyong
authors.initials: F
authors.lastname: Mao
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Liu
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China China-Korea United Cell Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Orthopaedic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China Cartilage Regeneration Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China China-Korea United Cell Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing, China limingwang99@hotmail.com.
authors.forename: Liming
authors.initials: L
authors.lastname: Wang
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D002356:Cartilage / Q000166:cytology*; D017886:Durapatite / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D011817:Rabbits; D023822:Tissue Engineering; D054457:Tissue Scaffolds
chemical_list: D011091:Polyesters; C016240:polycaprolactone; D017886:Durapatite
keywords: Polycaprolactone; bone marrow cells; cartilage tissue engineering; hydroxyapatite; three dimensional