[Preliminary study of constructing tissue-engineered cartilage with the endoskeletal scaffold of HDPE by bone marrow stromal cells].
OBJECTIVE
To explore the feasibility of using a nonreactive, permanent endoskeletal scaffold to create the prothesis in special shape which is covered with tissue-engineered cartilage.


METHODS
Porcine BMSCs and articular chondrocytes were isolated and expanded respectively in vitro. Porcine BMSC of passage 1 in the concentration of 10 x 10(7)/ml were seeded onto a cylinder-shaped PGA (1 mm in thickness)/Medpor (3mm in diameter and 5mm in highness) scaffold as the experimental group. After the cell-scaffold constructs were cultured for 5 days, the primary medium, high-glucose DMEM medium with 10% fetal bovine serum (FBS), was replaced by chondrogenically inductive medium for 4 weeks. BMSCs and chondrocytes of the same concentration were seeded respectively onto the scaffold as the negative control group and the positive control group. After cultured in vitro for 4 weeks, the cell-scaffolds construct were implanted into subcutaneous pockets on the back of nude mice. Four and eight weeks later, the formed cartilage prosthesis were harvested and then evaluated by gross view, histology, immunohistochemistry and glycosamino-glycan (GAG) content.


RESULTS
Cells in all groups had fine adhesion to the scaffold and could secrete extracellular matrix. All specimens in experimental group and positive control group formed mature cartilage with collagen II expression.The mature catrtilage wraped HDPE compactly and grown into the gap of HDPE. Mature lacuna structures and metachromatic matrices were also observed in these specimens. GAG contents in experimental group were (5.13 +/- 0.32) mg/g (4 weeks), (5.37 +/- 0.12) mg/g (8 weeks). In contrast, specimens in BMSC group showed mainly fibrous tissue.


CONCLUSIONS
It indicates that it is feasible to create special shaped tissue-engineering cartilage with the permanent internal support using BMSCs as seed cell.
Zhu
Lie
L
Department of Plastic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China.
Jiang
Hua
H
Zhou
Guang-Dong
GD
Wu
Yu-Jia
YJ
Luo
Xu-Song
XS
D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D002356:Cartilage / Q000166:cytology*; D018929:Cell Culture Techniques; D002454:Cell Differentiation; D002478:Cells, Cultured; D051379:Mice; D008819:Mice, Nude; D017154:Stromal Cells / Q000166:cytology*; D013552:Swine; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds