无血清培养胆囊癌GBC-SD细胞形成肿瘤细胞球的鉴定

目的:分离扩增肿瘤干细胞,并鉴定其生物学性质.方法:用无血清培齐基培养人胆囊癌GBC-SD细胞得到肿瘤细胞球.将肿瘤细胞球传代扩增,并用含血清培养基培养促使其分化;将肿瘤球和普通GBC-SD细胞分别种入96孔板,MTT检测增殖能力,并将肿瘤球和普通GBC-SD细胞分别植入裸鼠皮下,观察移植瘤的形成:流式细胞术检测CD15s和CD24在肿瘤球细胞和普通GBC-SD细胞中的表达,筛选细胞表面标志物.结果:在无血清培养基中,胆囊癌细胞可以形成少量的肿瘤细胞球,并显示很强的自我更新和增殖能力,含血清环境能够诱导其分化而贴壁生长;在动物实验中,肿瘤球细胞较普通GBC-SD细胞显示更强的致瘤能力(80.00%vs 10.00%,P<0.05);标志物CD15s在肿瘤球的表达较普通GBC-SD细胞明显增高(2.56%±0.38%vs 10.77%±0.93%,t=18.25,P<0.05).结论:人胆囊癌细胞GBC-SD的肿瘤干细胞可以通过无血清培养环境来分离和扩增,CD15s可能为其细胞表面标志物.

Identification of tumor spheres from human gallbladder carcinoma GBC-SD cells cultured in serum-free medium

AIM: To isolate and expand cancer stem cells in human gallbladder carcinoma cell line GBC-SD and to identify their biological properties. METHODS: GBC-SD cells were cultured in serum-free conditions to derive tumor spheres. Tumor spheres were then expanded and cultured in serum-containing medium to permit their differentiation. The proliferative capacity of tumor sphere-forming cells was tested by methyl thiazoly tetrazolium (MTT) assay. The tumorigenicity of tumor sphere-forming cells was evaluated using a...