分阶段添加细胞诱导因子诱导豚鼠脂肪间充质干细胞定向分化内耳毛细胞

背景：感音神经性耳聋主要是由内耳毛细胞的缺失或受损造成，用脂肪间充质干细胞来再生修复内耳毛细胞是治疗听力损失的有效方法。目的：探讨体外定向诱导豚鼠脂肪间充质干细胞向内耳毛细胞样细胞分化的可行性。方法：体外分离培养豚鼠脂肪间充质干细胞至第3代，流式细胞仪检测细胞免疫表型，分阶段加入表皮生长因子、碱性成纤维细胞生长因子、胰岛素样生长因子1、全反式维甲酸、脑源性神经营养因子、神经营养因子3，观察诱导分化的效果。结果与结论：豚鼠脂肪间充质干细胞体外培养呈梭形，漩涡状贴壁生长，第3代细胞表面标记CD29与CD44表达呈现阳性，CD34与CD45表达呈现阴性。应用细胞因子诱导后细胞早期nestin和GFAP表达阳性，继续诱导10 d后表达毛细胞特异性标记物MyosinⅦa和Math1，说明细胞因子可定向诱导豚鼠脂肪间充质干细胞向内耳毛细胞分化。

Adipose-derived mesenchymal stem cells differentiate into inner ear hair cells in guinea pigs induced by progressive addition of cytokines

BACKGROUND：Sensorineural hearing loss is mainly caused by missing or damaged hair cells in the inner ear. Application of adipose-derived mesenchymal stem cells to regenerate inner ear hair cells is an effective treatment for hearing loss. OBJECTIVE：To explore the feasibility of in vitro inducing adipose-derived mesenchymal stem cells to differentiate into inner ear hair cel-like cells in guinea pigs. METHODS：Adipose-derived mesenchymal stem cells from guinea pigs were isolated and cultured to the 3rd generation. cellphenotype was detected using flow cytometry. Cytokines were added for induction and differentiation by stages, including epidermal growth factor, basic fibroblast growth factor, insulin-like growth factor-1, al-trans retinoic acid, brain-derived neurotrophic factor, neurotrophin 3. RESULTS AND CONCLUSION：Adipose-derived mesenchymal stem cells of guinea pigs cultured in vitro were fusiform and showed a swirled adherent growth. Passage 3 cells were positive for CDCD29 and CD44, but negative for CD34 and CD45. After induction, the cells were positive for nestin and GFAP positive at early stage;after 10-day continuous induction, the cells expressed Myosin VIIa and Math1, specific markers of hair cells, indicating that cytokines can directly induce adipose-derived mesenchymal stem cells to differentiating into inner＆amp;nbsp;ear hair cells in guinea pigs.