大鼠脂肪源性干细胞定向分化为施万细胞样细胞的实验研究

Induced differentiation of rat adipose-derived stem cells into Schwann-like cells

目的研究体外培养成年大鼠脂肪源性干细胞(ADSCs)并诱导分化为施万细胞样细胞的潜能。方法分离、培养成年SD大鼠ADSCs,免疫细胞化学法鉴定细胞表面抗原CD44,CD49d和CD106。传6～8代的ADSCs接种在多聚赖氨酸铺板的培养板内,用含5ng/ml血小板源性生长因子,10ng/ml牛碱性成纤维细胞生长因子,14μmol/LForskolin,200ng/mlHeregulin及10%FBS的DMEM/F12培养基诱导分化12d,免疫细胞化学法鉴定细胞表面标记物GFAP,S-100和P75。结果分离纯化的ADSCs呈CD44和CD49d阳性,而CD106表达为阴性;诱导后的细胞呈梭形,并表达施万细胞特异性标志蛋白-GFAP,S-100和P75。结论从大鼠脂肪组织能获得具有增殖和分化潜能的干细胞,这些细胞在特定条件下可定向诱导分化为施万细胞样细胞。

Objective To assess the differentiation potential of mt adipose-derived stem cells （ADSCs） into Schwann-like cells in vitro. Methods ADSCs isolated from adult SD rats were cultured in vitro and identified with the cell surface antigens CD44, CD49d and CD106 by immunocytochemistry. The ADSCs of the sixth to eighth passages were inoculated in polylysine-coated culture plate and cultured for 12 days in DMEM/F12 culture medium containing 10% fetal bovine serum, 5 ng/ml platelet-derived growth factor, 10 ng/ml basic fibroblast growth factor, 14 μmol/L Forskolin and 200 ng/ml Heregulin to induce their differentiation in vitro. Immunocytochemistry was performed to identify the expression of the cell surface markers nestin, glial fibrillary acidic protein （GFAP）, S-100, and P75. Results The isolated and purified ADSCs were positive for CD44 and CD49d expressions but negative for CD106. After 12 days of culture in the conditional culture medium, most of the cells showed positive expressions of GFAP, S-100, and P75, the specific protein markers of Schwarm cells. Conclusions Adult rat ADSCs are confirmed to have potentials of neuroglial differentiation and capable of differentiating into Schwann-like cells in vitro.