ABSTRACT
Objective:To evaluate the effect of rhizome drynaria combined with tissue engineering cartilage on cartilage regeneration in experimental rabbits with cartilage defects.Methods:The hIGF-1 gene was transfected into MSCs by using the method of isola tion,purification and recombination of transgenic stem cells.The MSCs were transplanted into rabbit bone marrow mesenchymal stem cells (MSCs) in vitro.The cells were further amplified and mixed with acellular dermal matrix (ADM) to construct tissue engineered cartilage.Twenty-four New Zealand white rabbits,aged 6 months,were randomly divided into 4 groups (A,B,C and D).six rabbits in each group.Group A and C were transplanted with autologous cartilage.Group B and D were transplanted with modified cells.Group C and D group were fed with 40％ Drynaria Decoction,150ml/d for 4 weeks.Animals were sacrificed at 12 weeks postoperatively,and articular cartilage defects were isolated.Cartilage defect samples were embedded in paraffin blocks and stained with hematoxylin and eosin (H&E).Cartilage regeneration was evaluated by gross morphology,including sclerotic shape,color,contour and homogeneity.The quality of regenerated cartilage was assessed by histological scoring.Toluidine blue staining was used to evaluate the occurrence of chondrogenic glycosaminoglycans (GAG).Results:Compared with group B,the cartilage coverage,the color of new bone marrow,the edge of defect and the surface roughness of group C and D were significantly improved (P＜0.05);the cartilage surface score of regenerated cartilage was significantly improved P＜0.05).Groups C and D had better matrix,cell distribution and surface index than the other groups.And had a thick like hyaline cartilage tissue,with the normal glycosaminoglycan production.It is indicated that drynaria combined with tissue engineering cartilage can reduce cartilage defects by regenerating hyaline cartilage.Conclusion:Cartilage combined with drynariae can significantly improve the quality of cartilage defect repair in rabbit knee joint,and provide an important theoretical basis for clinical treatment of cartilage lesions.