兔膀胱移行上皮细胞与丝素蛋白膜相容性研究

目的 探讨用于膀胱组织工程研究的移行上皮种子细胞的培养方法,检测丝素蛋白膜与膀胱移行上皮细胞的细胞相容性,探讨构建泌尿系腔道组织工程器官的可能性.方法 (1)取兔膀胱移行上皮细胞体外培养,观察细胞形态变化及生长、增殖过程,并进行免疫荧光鉴定;(2)分别设立空白组(无细胞)、阴性对照组(培养基)和实验组(丝素蛋白膜浸提液).取对数生长期的膀胱移行上皮细胞,lx104/ml接种于96孔板中,每组各5孔,于接种后24、72和120h,通过MTT法显色.并于酶标仪490nm波长下检测吸光度值,计算相对增殖率,对丝素蛋白膜与膀胱移行上皮细胞的相容性进行评估.结果 细胞在第9～10天融合形成单层,细胞形态呈多角形的铺路石子状,经免疫荧光鉴定证实为移行上皮细胞;24、72和120 h实验组吸光度值分别为0.424±0.020、0.996±0.118和1.285±0.048.阴性对照吸光度值分别为0.419±0.030、1.105±0.098和1.228±0.052,两组比较无明显差异(P＞0.05).结论 丝素蛋白膜与膀胱移行上皮细胞相容性良好,具有作为泌尿系腔道组织工程支架的潜在运用价值.

Cytocompatibility of silk fibroin film with rabbit urinary bladder transitional epithelial cells

OBJECTIVE: To obtain large quantities of well differentiated urinary bladder transitional epithelial cells for used as the seed cells in bladder tissue engineering, and evaluate the cytocompatibility of silk fibroin film with the transitional cells in vitro to assess the possibility of tissue-engineered urinary organ construction. METHODS: The urinary bladder transitional epithelial cells were isolated from the bladders of New Zealand rabbits and cultured in vitro as the seed cells, whose morphology was observed and the specific protein (cytokeratin) expression identified by immunofluorescence assay. The cells were seeded in 96-well plates at 1 x 10(>4)/ml and incubated with silk fibroin film leaching solution or culture medium (negative control). MTT assay was performed to determine the cell proliferation rates of the wells and evaluate the cytotoxicity and cytocompatibility of the silk fibroin film. RESULTS: The isolated urinary bladder transitional epithelial cells reached confluence after 9-10 days of culture, which showed positive staining for immunocytochemistry with monoclonal antibody against cytokeratin. The absorbance of the cells culture in the presence of silk fibroin film leaching solution averaged 0.424-/+0.020, 0.996-/+0.118 and 1.285-/+0.048 after at 24, 72 and 120 h of cell culture, and that of the negative control group at the time points was 0.419-/+0.030, 1.105-/+0.098 and 1.228-/+0.052, respectively, showing no significant difference between the two groups (P>0.05). CONCLUSION: Silk fibroin film has good cytocompatibility with rabbit urinary bladder transitional epithelial cells, and may serve as good scaffold material for urologic tissue engineering.