采用组织工程技术建造人工膀胱组织的实验研究

Reconstruction of bladder tissue using tissue-engineering technique

目的 通过将扩增的膀胱种子细胞与一定形状聚合材料复合后植入裸鼠体内进行培育 ,尝试采用组织工程技术建造人造膀胱组织的可行性。方法 从幼兔取膀胱 ,机械分离与酶消化获取上皮细胞和平滑肌细胞 ,在体外培养并扩增细胞 ,之后将上皮细胞和平滑肌细胞分别接种到聚合材料的内外表面 ,将其植入到裸鼠体内进行培育。对植入术后4、8周的标本取材 ,进行大体、组织学观察及免疫组化检测。结果 培育的细胞材料复合体的内壁可形成数层移行上皮细胞层 ,外壁由数层平滑肌细胞层构成。随着聚合材料的降解 ,移行上皮细胞与平滑肌细胞不断增殖并达汇合。

Objective To evaluate the feasibility of reconstruction of artificial bladder tissue using the expanded bladder cells seeded onto both sides of a synthetic PLGA polymer and cultured in the nude mice by tissue engineering technique. Methods The urothelial cells and smooth muscle cells were obtained from young rabbits by mechanical isolation and enzyme digestion method. In vitro cultured and expanded smooth muscle cells and urothelial cells were seeded onto the outer and inner surfaces of each polymer. Then, the constructs were implanted into the subcutaneous pockets of athymic mice. At 4 and 8 weeks after implantation, the specimens were harvested and examined macroscopically, histologically, and immunohistochemically. Results The polymer was covered with urothelial cells inside and smooth muscle cells outside. As polymer degradation was in progress, the urothelial cells and the smooth muscle cells kept proliferation and converged. Conclusion Artificial bladder tissue reconstructed by tissue engineering technique has the similar properties to those of the normal bladder wall. This study has laid solid foundation for further studies of tissue engineering bladder.