title: Effects of TGF-β1 and alginate on the differentiation of rabbit bone marrow-derived mesenchymal stem cells into a chondrocyte cell lineage.
abstract: The aim of the present study was to investigate the effect of a three-dimensional (3D) culture system of sodium alginate gel on the directional differentiation induction of bone marrow-derived mesenchymal stem cells (BMSCs) into chondrocytes, as well as thein vitrogene transfection technique. The biological characteristics of the passage and proliferation of rabbit BMSCs were investigated under conditions ofin vitromonolayer and 3D culture of sodium alginate gel. Transforming growth factor (TGF)-β1 gene recombinant adenoviral cosmid vectors and the recombinant adenoviral vector Ad.TGF-β1 were constructed, and the effect of Ad.TGF-β1 transfection on the differentiation of BMSCs into chondrocytes was investigated. The whole bone marrow rinsing method was used to obtain, separate and purify the rabbit BMSCs, and thein vitromonolayer and 3D culture of sodium alginate gel were thus successfully and stably established. A safe, stable and efficient method of constructing Ad.TGF-β1 TGF-β1 gene recombinant adenoviral vectors was established. Following TGF-β1 transfection, BMSCs were able to continuously secrete significantly increased amounts of specific extracellular matrix components of chondrocytes, such as collagen II and proteoglycans. Furthermore, the effects in the post-gene transfection 3D culture group were found to be enhanced compared with those in the monolayer culture group. In conclusion, the 3D culture system of sodium alginate gel andin vitrogene transfection exhibited significant inductive effects on differentiation, which could be used to promote BMSCs to differentiate into chondrocytes.
authors.affiliation: Department of Orthopedics, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, Fujian 350025, P.R. China.
authors.forename: Wan-Zong
authors.initials: WZ
authors.lastname: Wang
authors.affiliation: Department of Orthopedics, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, Fujian 350025, P.R. China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Yao
authors.affiliation: Department of Orthopedics, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, Fujian 350025, P.R. China.
authors.forename: Xiao-Jin
authors.initials: XJ
authors.lastname: Huang
authors.affiliation: Department of Orthopedics, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, Fujian 350025, P.R. China.
authors.forename: Jin-Quan
authors.initials: JQ
authors.lastname: Li
authors.affiliation: Department of Orthopedics, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, Fujian 350025, P.R. China.
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
keywords: TGF-β1; bone marrow-derived mesenchymal stem cells; chondrocytes; gene transfection; three-dimensional culture