大鼠肝卵圆细胞的分离培养及脾内移植研究

目的 观察肝卵圆细胞在同种异体大鼠脾内移植的演变结果,为肝干细胞移植治疗临床肝功能衰竭提供实验依据。方法 采用改进的梯度离心法分离肝卵圆细胞,体外培养鉴定后移植入2/3肝切除的同种异体大鼠脾脏内。结果 每只模型大鼠肝脏中可分离获得约1.69×10~5/ml肝卵圆细胞。体外培养的肝卵圆细胞呈现上皮细胞的生长特点,对OV6、细胞角蛋白19及甲胎蛋白染色呈阳性反应,对白细胞共同抗原染色呈阴性反应。肝卵圆细胞植入异体大鼠脾脏内可形成岛屿状肝组织结构,形成“肝化脾”。结论 大鼠肝卵圆细胞具有肝干细胞的生物学特征,在一定条件下可分化为肝细胞及胆管上皮细胞。

Isolation, culture and intraspleenic transplantation of rat hepatic oval cells

Objective To observe the evolution and differentiation of hepatic oval cells after transplanted into the spleens of homogenous rats, providing experimental data for treating hepatic failure with hepatic stem cells. Methods A two-step perfusion procedure was used to separate hepatic parenchymal cells from nonparenchymal cells. Then the suspension of nonparenchymal cells was centrifuged in Percoll gradients. The isolated cells were cultured, identified, and then transplanted into the spleens of homogenous rats undergone 2/3 hepatectomy. Results The obtained cells were various in size with ovoid nuclei and inadequate cytoplasm. After 12 hours' culture, they revealed the characteristics of epithelial cells. Both the freshly isolated and cultured cells showed positive staining for cytokeratin 19 (CK19), OV6, a fetal protein (AFP), but negative for leucocyte common antigen (LCA). After intraspleenic transplantation into homogenous rats undergone partial hepatectomy, hepatic oval cells were differentiated into liver tissue-like structure including hepatocyte cords and bile ducts, and formed hepaticized spleen. But this kind of structure was not observed in the controls. Conclusion The isolated rat hepatic oval cells show the biological characteristics of hepatic stem cells and can differentiate into hepatocytes and biliary epithelial cells under appropriate circumstances.