摘要
目的 观察包埋透明质酸（HA）/壳聚糖（CS）/质粒DNA （pDNA）纳米粒的壳聚糖支架对软骨细胞生物学性状的影响及基因转染能力,探讨其作为基因活化软骨组织工程支架的可行性.方法 构建包埋HA/CS/pDNA纳米粒的壳聚糖支架,负载兔关节软骨细胞体外培养,1～2周后通过扫描电镜、组织学、免疫组织化学、倒置相差显微镜及激光共聚焦显微镜检测支架对软骨细胞表型及功能的影响,以及基因转染的能力.结果 支架孔径为100～300 μm,孔孔隙率为（86.0±1.2）％;软骨细胞在包埋HA/CS/pDNA纳米粒的支架中贴附良好,维持表型稳定,1～2周时实验组分泌蛋白多糖及Ⅱ型胶原等软骨细胞外基质较对照组明显增多,1周时测得支架中的HA/CS/pDNA纳米粒介导基因转染软骨细胞并表达绿色荧光蛋白.结论 包埋HA/CS/pDNA纳米粒的壳聚糖支架细胞相容性良好,能转染培养的软骨细胞表达绿色荧光蛋白.
Objective To evaluate the feasibility and the value of porous chitosan scaffolds with embedded hyaluronic acid/chitosan/plasmid DNA （HA/CS/pDNA） nanoparticles as a gene-activated scaffold for the cartilage tissue engineering after an observation of how they affect the cell behaviors and gene transfection capability towards chondrocytes in vitro.Methods Porous chitosan scaffolds with embedded HA/CS/pDNA nanoparticles were constructed,and then chondrocytes were seeded and cultured in a threedimensional environment for 1-2 weeks.The effects of the gene activated scaffold on the cell phenotype,proliferation,synthesis of the extracellular matrix,and the ability of gene transfection towards cultured chondrocytes were observed by the scanning electron microscopy,histology,immunohistochemistry,phasecontrast microscopy and laser scanning confocal microscopy.Results The porosity of the scaffold was （86.0 ± 1.2）% with pores ranging in size from 100-300 μm.Chondrocytes which attached to the wall of pores of the scaffold had largely maintained round morphology and could secrete the extracellular matrix such as proteoglycan and collagen Ⅱ.The HA/CS/pDNA nanoparticles could mediate gene transfection towards chondrocytes and express enhanced green fluorescent protein （EGFP）.Conclusion Porous chitosan scaffolds with embedded HA/CS/pDNA nanoparticles have a good cellular compatibility,can mediate gene transfect towards cultured chondrocytes to express EGFP,and are expected to be an ideal gene activated scaffold for cartilage tissue engineering.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2014年第2期362-364,共3页
Chinese Journal of Experimental Surgery
基金
国家自然科学基金资助项目（81272040、30600632）
广东省自然科学基金资助项目（S2011010004808）
关键词
壳聚糖
软骨细胞
基因活化基质
转染
组织工程
Chitosan
Chondrocyte
Gene-activated matrices
Transfection
Tissue engineering
