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胎儿肝干细胞的分离、鉴定及培养 被引量:1

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摘要 目的:分离、鉴定人胎肝中肝干细胞并短期培养,为体外扩增及诱导分化实验提供细胞来源。方法:采用原位两步胶原酶灌注结合Percoll液密度梯度离心的方法分离、纯化胎肝中肝干细胞,用光镜、电镜观察所得细胞形态,通过免疫细胞化学染色检测细胞AFP、CK19、CD34。测量肝脏重量及获得的肝干细胞数量,计算肝干细胞产量,对肝干细胞进行短期培养。结果:两步胶原酶灌注可有效消化胎儿肝脏结缔组织,分离的肝脏细胞经不连续Percoll密度梯度离心,可得到肝干细胞,细胞活性率为(88.35±2.45)%(n=30)。光镜下肝干细胞呈卵圆形,直径约为成熟肝细胞的1/3,电镜下肝干细胞直径约10μm,细胞大部分被卵圆形细胞核所占据,细胞质少,核浆比例大,内质网、线粒体、高尔基体等细胞器不发达。ABC法免疫细胞化学染色显示:胎儿肝干细胞CK19、CD34及AFP呈阳性信号。对肝干细胞进行培养,12h后肝干细胞逐渐粘附、贴壁、铺展,呈现为圆形、椭圆形,呈上皮细胞样平铺生长。肝干细胞产量为(8.76±0.46)×105个/g(n=15)。结论:两步胶原酶灌注结合不连续Percoll液密度梯度离心法可较好地分离纯化胎儿肝干细胞,所得细胞可体外培养,可做为进一步实验的材料。
出处 《继续医学教育》 2009年第4期36-39,共4页 Continuing Medical Education
基金 天津市科委攻关基金资助项目 No.05YFSZSF02500
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