摘要
目的联合应用自制生物凝胶和三维支架材料,建立组织工程种子细胞的三维支架双相接种技术,并对其构建生成组织工程关节软骨的效果进行初步观察。方法酶消化法分离幼兔关节软骨细胞,于培养瓶中接种、培养,收集第1代软骨细胞,以2.5×107/ml加入液态的自制生物凝胶液中充分混均,制成细胞-凝胶混悬液,接种于CPPf/PLLA(caliumpolyphosphatefiber/poly-L-lacticacid)三维支架材料中,经固化后形成工程化组织块,体外连续培养4周。行大体、倒置显微镜以及组织学、Ⅰ型和Ⅱ型胶原免疫组化光镜观察,二甲基亚甲蓝显色法定量检测硫酸糖胺多糖含量。结果(1)细胞-凝胶混悬液接种后完全充满CPPf/PLLA支架的孔隙,固化后三者很好地形成一个工程化组织整体。构建的工程化组织块在培养过程中不仅能够保持其初始外形,而且能保持种子细胞稳定的三维均相分布,无细胞脱落现象。同时,硬度亦不断增加,有弹性,表面湿润、光滑。(2)随着培养时间的延长,软骨组织的形成是由外周向中心进行。培养2周后,逐渐形成富含Ⅱ型胶原和蛋白聚糖、具有典型软骨组织结构的成熟工程化软骨。同时,Ⅰ型胶原逐渐转为阴性,支架材料亦不断降解。4周时硫酸糖胺多糖含量平均为(15.70±2.00)mg/g(湿重),为天然关节软骨的30%以上。结论种子细胞的三维支架双相?
Objective To establish the technique of biphasic seeding of articular chondrocyte s in vitro for cartilage engineering in u sing a self designed biological gel a nd the three-dimensional scaffold a nd observe the efficiency of cartilage regeneration in vitro-tissue engin eered articular cartilage from cell scaffold complex.Methods The articular chondrocytes were iso lated enzymatically from the epiphyseal cartilage of young rabbits,and were then plated i nto the tissue culture flasks and were cultivated.The first passage ar-ticular chondrocytes were collecte d and mixed fully with the self-made l iquid biological gel-matrix at appr oxi-mately 2.5×10 7 cells /ml to form cell-gel fluid.The cell-gel fluid was dropped into the p orous CPPf /PLLA(calcium polyphosphate fiber /poly -L -lactic acid)scaffold,and a cell-gel-scaffold c omplex was formed after being solidified.The complexes were cultivated for 4weeks.The changes of complexes in morphology and synthesis of collagen typeⅡandⅠand aggregates were investigated under the gross and the phase and light microscope.The GAG sulfate content in complexes was quantitatively mea sured by the modified dimethyl-methylene blue method.Results1)After feeded,the porous CPPf /PLLA s caffolds were completely filled with the liquid chondrocyte-gel and the chondrocyte-gel-scaffold comp lexes were well formed by solidification.During the cultivation,the complex es could keep its original shape and m aintain the stable homogeneous three-dimensional distribution of chondrocytes in themselves without cell falling.In the same time,the com-plexes were gradually increasing th e consistency with the elasticity an d lubrication surface.2)The chondro-genesis began in the periphery area a nd extended to the central area of the complexes with the passage of cultivation period.After the 2nd we ek,the complexes were gradually reorganized into the mature engineered cartilage with typical cartilaginous histological structure,with ric h typeⅡcollagen and the strong typical het-erochromia to toluidine blue,but wi th gradually fading negative immunological stain of collagen typeⅠ.Meantime,the scaffold was graduall y de-graded in the complexes.The average content of GAG sulfate in the enginee red cartilages at 4th week was(15.70±2.00)mg /g(wet weight ),and was over 30%of the natural articular cartila ge.Conclusion The technique of chondrocytes biphasic seeding for three-dimensional scaffold has advantages of simple manipulation,fix ing cell stably in the scaffold,main-taining the original shape of the com plexes and the stable homogeneous th ree-dimensional distribution of chondrocytes in the scaffold,and ad vancing the regeneration and matura tion of tissue-engineered articula r cartilage.[
出处
《中华骨科杂志》
CAS
CSCD
北大核心
2002年第6期372-376,共5页
Chinese Journal of Orthopaedics
基金
国家自然科学基金重点项目资助(39830100)
全军"十五"医药卫生科研基金重点课题(01Z072)
