大鼠骨骼肌卫星细胞体外培养生长和成肌特性

目的建立大鼠骨骼肌卫星细胞分离和纯化方法,并观察骨骼肌卫星细胞的体外增殖和成肌特性。方法采用改良两步酶消化法结合差速贴壁技术,获得高纯度的骨骼肌卫星细胞。免疫组化染色鉴定体外培养的骨骼肌卫星细胞;MTT法检测体外培养骨骼肌卫星细胞的生长情况;倒置显微镜观察不同培养条件下骨骼肌卫星细胞的分化特性。结果获取的骨骼肌卫星细胞纯度高,细胞中肌源性标志中间丝蛋白desm in呈强阳性表达。体外培养时,骨骼肌卫星细胞有1~2 d的潜伏期,5~6 d进入平台期。细胞汇合至60%~70%或降低培养基血清浓度时,开始相互融合形成肌管细胞。结论酶两步消化法和差速贴壁技术是一种简便易行、获得较高纯度的骨骼肌卫星细胞的方法。骨骼肌卫星细胞体外培养时无需特殊诱导即可相互融合,形成具有骨骼肌收缩特性的肌管细胞。

Characteristics of proliferation and myotube cell formation of rat skeletal muscle satellite cells cultured in vitro

Objective To establish a method of isolation and purification of rat skeletal muscle satellite cells,and observe the characteristics of proliferation and myotube cell formation of skeletal muscle satellite cells cultured in vitro. MethodsPurified skeletal muscle satellite cells were obtained by improved two-step enzymatic digestion method and pre-plating technique.Immunohistochemical staining was employed to identify the skeletal muscle satellite cells cultured in vitro.The growth of skeletal muscle satellite cells cultured in vitro was examined by MTT assay.The differentiation of skeletal muscle satellite cells was observed by inverted microscopy. Results The skeletal muscle satellite cells with higher purity were obtained and confirmed by the high expression of desmin.When cultured in vitro,the latent phase of skeletal muscle satellite cells was the first to the second day,and the platform phase was the fifth to the sixth day.Myotube cells gradually formed when cell confluence was more than 60% to 70% or differential medium with lower fetal bovine serum was used.Conclusion The combination of improved two-step enzymatic digestion method and pre-plating technique serve as an easy and practical way to obtain skeletal muscle satellite cells with higher purity.Skeletal muscle satellite cells can form myotube cells with contraction characteristics without any special induction.