取向性关节软骨细胞外基质源性支架对负载软骨细胞生物学行为的影响

Effect of oriented cartilage extracellular matrix-derived scaffold on biological behavior of in vitro cultured chondrocytes

  • 摘要: 目的: 观察取向性关节软骨细胞外基质源性支架对负载软骨细胞的黏附、增殖、分布及排列的影响。方法: 利用定向结晶及冷冻干燥技术制备猪关节软骨细胞外基质源性取向支架。分离、培养犬关节软骨细胞,接种在支架上体外培养,CCK-8试剂盒检测细胞在支架上的黏附和增殖,倒置显微镜、荧光显微镜、扫描电镜及H&E染色观察软骨细胞在支架上的形态、分布和排列情况,并以接种在非取向支架上的软骨细胞的生物学特性作为对照。结果: 软骨细胞在两种支架上均能较好的黏附生长,大部分细胞呈圆球形;但在取向支架上增殖比在非取向支架上快(P<0.05);并且在取向性支架上软骨细胞能沿着支架孔道的取向性生长,在支架内部分布均匀,类似天然软骨组织的柱状结构;而在非取向性支架内软骨细胞呈无序排列,分布不均匀,支架内部细胞数量较少。结论: 取向性软骨细胞外基质源性支架利于软骨细胞黏附、增殖,能引导软骨细胞分布排列呈类似于天然软骨细胞的柱状排列方式,是一种较理想的软骨组织工程支架。

     

    Abstract: Objective: To investigate the effects of cartilage extracellular matrix-derived oriented scaffolds on attachment,proliferation,distribution and alignment of chondrocytes seeded in the scaffolds cultured in vitro. Methods: Oriented cartilage extracellular matrix-derived scaffolds were fabricated with freeze-dried method using unidirectional solidification as a freezing process.After labeled with PKH26,canine chondrocytes were seeded onto the scaffolds and incubated for 1,3,5 and 7 days,respectively.Attachment,proliferation and viability of the cells were measured by mitochondrial dehydrogenase activity(CCK-8 assay).Morphology,distribution and alignment of chondrocytes in the scaffolds were analyzed by invert microscopy,fluorescent microscopy,scanning electron microscopy and H&E staining.Chondrocytes seeded into non-oriented cartilage extracellular matrix-derived scaffolds were used as controls. Results: Chondrocytes seeded in both scaffolds showed good attachment and viability from day 1 to day 7,most of the cells in both scaffolds were spheric in shape.However,proliferation of chondrocytes seeded in oriented scaffolds(OS) was higher than that of chondrocytes seeded in nonoriented scaffolds(NOS).Moreover,chondrocytes seeded in the OS,were widely distributed within the scaffolds and aligned themselves along the oriented pore,mimicking a columnar arrangement whereas chondrocytes seeded in the NOS were randomly distributed within the scaffolds and less in number. Conclusion: Cartilage extracellular matrix-derived oriented scaffolds can support chondrocytes to accommodate and guide their growth into cartilagous tissue,and therefore,can be used as a three dimensional scaffold in cartilage tissue engineering.

     

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