自体骨髓间充质干细胞复合膀胱去细胞基质修复犬膀胱缺损的实验研究

目的 探讨利用自体骨髓间充质干细胞(BMSCs)复合膀胱去细胞基质(BAMG)进行犬膀胱缺损修复重建的可行性。方法 25只杂种犬，5只用于制备BAMG，20只随机分为两组进行膀胱部分切除术。A组用单纯BAMG修复膀胱缺损，B组用复合自体BMSCs的BAMG修复膀胱缺损。分别在术后1、2、4、8、12周取材进行组织学和免疫组织化学检测评价膀胱组织再生情况。结果 所有动物术后均存活。组织学检测结果表明B组术后2周时已有尿路上皮形成，术后8周和12周时在修复区再生出与正常膀胱组织相似的膀胱壁结构。A组术后4周观察到尿路上皮再生，术后12周时仍然缺乏良好的平滑肌组织再生。结论 自体BMSCs复合BAMG比单纯BAMG更能促进膀胱缺损区修复和组织再生。自体BMSCs是组织工程膀胱可供选择的种子细胞来源。

Bladder Reconstruction using Autologous Bone Marrow Mesenchyaml Stem Cells-seeded Bladder AcellelarMatrix Graft in a Canine Model

Objective To investigate the feasibility of autologous bone marrow mesenchymal stem cells (BMSCs) seeded on bladder acellular matrix graft (BAMG) for bladder reconstruction in a canine model. Methods This study included 25 mongrel dogs. Five dogs were sacrificed for the preparation of BAMG. Twenty dogs were randomly divided into two groups and received partial cystectomy. In group A, the bladder defect was repaired with unseeded BAMG. In group B, the bladder defect was repaired with autologous BMSCs-seeded BAMG. The bladders were retrieved and studied histologically and immunohistochemically at the time point of 1, 2, 4, 8, 12 weeks after surgery to evaluate tissue regeneration. Results All dogs survived the procedure. Histopathological examination in group B showed there was urothelium developed at the end of the 2 weeks. By 8 and 12 weeks all bladder wall components were regenerated in the repaired area, which were similar to normal bladder tissue. In group A, urothelium regeneration was observed at the end of the 4 weeks, whereas smooth muscle was still not well-formed by 12 weeks. Conclusion Autologous BMSCs-seeded BAMG could promote the repair of bladder defect, which is superior to unseeded BAMG in regenerative properties.