Biocompatibility of double-layer poly(L-lactic acid) electrospun nanofiber scaffold with human periodontal ligament cells / 中国组织工程研究

ABSTRACT

BACKGROUND:The morphological structure of nanofiber scaffold which fabricated by electrospinning technique is similar to the natural extracelular matrix, which provides a good microenvironment for cel growth and proliferation, and can also enhance cel adhesion, migration, proliferation and differentiation. OBJECTIVE: To observe the biocompatibility of double-layer poly(L-lactic acid) electrospun nanofiber scaffold and human periodontal ligament cels. METHODS: Electrospinning technique was used to prepare double layers poly(L-lactic acid) electrospun nanofiber scaffold. The toxicity of different concentrations of (100%, 75%, 50%, 25%) double-layer poly(L-lactic acid) electrospun nanofiber scaffold extracts to human periodontal ligament cels was evaluated by MTT assay. The double-layer poly(L-lactic acid) electrospun nanofiber scaffold was co-cultured with human periodontal ligament cels. The cel adhesive capacity in early stage was determined by MTT assay. The growth of cels on the scaffold was observed by scanning electron microscopy. RESULTS AND CONCLUSION: Different concentrations of double-layer poly(L-lactic acid) electrospun nanofiber scaffold extracts did not create any toxicity to human periodontal ligament cels. After co-culture for 2, 6, 24 hours, human periodontal ligament cels were poorly adherent onto the double-layer poly(L-lactic acid) electrospun nanofiber scaffold. After 7 days of co-culture, human periodontal ligament cels adhered wel on the loose surface of scaffold, maintained the original shape, stretched wel, and interconnected processes were observed; on the dense surface of the scaffold, multi-layer cels were observed. The cels showed fusiform or polygonal appearance and were connected together. These results demonstrate that the double-layer poly(L-lactic acid) electrospun nanofiber scaffold has good biocompatibility with human periodontal ligament cels.