title: Cartilage repair using an in vitro generated scaffold-free tissue-engineered construct derived from porcine synovial mesenchymal stem cells.
abstract: The objective was to in vitro generate a mesenchymal stem cell (MSC)-based tissue-engineered construct (TEC) to facilitate in vivo repair in a porcine chondral defect model. Porcine synovial MSCs were cultured in monolayer at high density and were subsequently detached from the substratum. The cell/matrix complex spontaneously contracted to develop a basic TEC. Immunohistochemical analysis showed that the basic TEC contained collagen I and III, fibronectin, and vitronectin. The basic TEC exhibited stable adhesion to the surface of a porcine cartilage matrix in an explant culture system. The TEC cultured in chondrogenic media exhibited elevated expression of glycosaminoglycan and chondrogenic marker genes. The TEC were implanted in vivo into chondral defects in the medial femoral condyle of 4-month-old pigs, followed by sacrifice after 6 months. Implantation of a TEC into chondral defects initiated repair with a chondrogenic-like tissue, as well as secure biological integration to the adjacent cartilage. Histologically, the repair tissue stained positively with Safranin O and for collagen II. Biomechanical evaluation revealed that repair tissue exhibited mechanical properties similar to those of normal porcine cartilage in static compression and friction tests. This technology is a unique and promising method for stem cell-based cartilage repair.
authors.affiliation: Department of Orthopaedics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Ando
authors.forename: Kosuke
authors.initials: K
authors.lastname: Tateishi
authors.forename: David A
authors.initials: DA
authors.lastname: Hart
authors.forename: Daisuke
authors.initials: D
authors.lastname: Katakai
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Ken
authors.initials: K
authors.lastname: Nakata
authors.forename: Jun
authors.initials: J
authors.lastname: Hashimoto
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Fujie
authors.forename: Konsei
authors.initials: K
authors.lastname: Shino
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: Norimasa
authors.initials: N
authors.lastname: Nakamura
mesh_terms: D000818:Animals; D002356:Cartilage / Q000166:cytology*; D002448:Cell Adhesion; D002469:Cell Separation / Q000379:methods*; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D013552:Swine; D023822:Tissue Engineering / Q000379:methods*