猕猴单倍体相合非清髓造血干细胞联合间充质干细胞移植的实验研究

目的 用非清髓预处理建立猕猴单倍体相合造血干细胞移植(HSCT)模型，研究间充质干细胞(MSC)在单倍体相合移植中的作用。方法采用健康、单倍体相合的猕猴亲子配对，受非清髓性预处理用氟达拉滨 环磷酰胺 ^60Co(200cGy)全身照射 兔抗人胸腺细胞球蛋白，移植物抗宿主病(GVHD)预防用环孢菌素A、霉酚酸酯、抗CD25单抗。实验分为单纯造血干细胞(HSC)移植组和HSC联合MSC移植组；检测供受体嵌合水平，观察造血恢复、GVHD等情况。结果单倍体相合的子代猕猴采用非清髓预处理方案，可获稳定植入?比较了单纯非清髓HSC移植组和HSC联合MSC移植组的造血恢复，发现造血恢复时间主要与嵌合状态有关；MSC可促进植入；相同条件下，HSC联合MSC移植组更容易形成供受混合嵌合；GVHD的发生率低。结论成功建立了猕猴非清髓性单倍体相合HSCT的模型，非清髓HSCT联合MSC可能在单倍体相合移植中有较好效果。

Establishment of a rhesus haploidentical hematopoietic stem cell and mesenchymal stem cell transplantation model by nonmyeloablative conditioning

Objective To establish rhesus haploidentical hematopoietic stem cell transplantation model by nonmyeloablative conditioning, and examine the effects of mesenchymal stem cells (MSC) in haploidentical transplantation. Methods The recipient haploidentical rhesus monkeys were conditioned with a nonmyeloablative regimen consisted of fludarabine, cyclophosphamide, 200 cGy total body irradiation, and rabbit anti-human thymocyte globulin. Cyclosporine A, mycophenolate mofetil and anti CD25 antibody were used for graft versus host disease (GVHD) prophylaxis. Rhesus monkeys in one group were given hematopoietic stem cell (HSC) only, while in the other group HSC combined with MSC. The differences in hematopoiesis recovery, chimerism level, and GVHD between the two groups were evaluated. Results Stable chimerism could be achieved in recipient monkeys. Hematopoiesis recovery was mainly related with chimerism level. MSC seemed capable of facilitating HSC engraftment, as there were more mixed chimerisms and less GVHD occurrence in the HSC combined with MSC recipient group. Conclusion A rhesus haploidentical hematopoietic stem cell transplantation model is successfully established by nonmyeloablative conditioning. MSC was of great benefit to haploidentical transplantation.