大鼠骨髓间质干细胞对同种骨髓移植后造血重建和免疫重建的作用

目的：探讨大鼠骨髓间质干细胞（MSC）对 同种异体骨髓移植造血重建和免疫重建的影响。方法:建立大鼠同种异 体骨髓移植模型，通过生存率分析、外周血象检测、免疫细胞计数和受体免疫功能检测，综 合评价MSC对骨髓移植(bone marrow transplantation,BMT)后造血重建和免疫重建的作用。 结果：(1) MSC可促进BMT后造血重建：移植后30 d，共移植组外周血白 细胞、淋巴细胞和血小板数均高于单纯骨髓移植组；共移植组骨髓细胞数也高于对照组。(2 )MSC可促进BMT后免疫重建：移植后30 d，共移植组胸腺细胞数、脾细胞总数均高于骨髓单 纯移植组；共移植组对ConA、LPS 刺激的淋巴细胞增殖反应以及对第三体来源的同种混合淋 巴细胞反应均强于单纯BMT组。结论：大鼠MSC与骨髓共移植对同种异体 骨髓移植造血重建和免疫重建有一定促进作用。

Effects of cotransplantation of rat bone marrow mesenchymal ste m cells and bone marrow on hematopoiesis

AIM: To investigate effects of rBMMSC on hematopoiesis and immune reconstitution after allo-hematopoietic stem cells transplantation (HSCT). METHODS: Allogeneic BMT model from Fischer344 rats (RT-1Al) to Wistar rats (RT-1Au) was established. The effects of MSCs on hematopoietic reconstitution and immune reconstitution were studied by observing the survival rate, peripheral blood counts, thymus counts, spleen counts, bone marrow counts and immune function analysis at 30 days after transplantation. RESULTS: 1. Cotransplantation of MSCs and bone marrow (BM) was demonstrated to improve hematopoietic reconstitution. Lymphocyte and platelet counts in peripheral blood in cotransplantation groups were higher than those in control groups. More bone marrow neucleated cells were also observed in cotransplantation groups. 2. Cotransplantation of MSCs and BM improved immune reconstitution. First, overall thymic cellularity and spleen cellularity significantly increased in cotransplantation groups at day 30. Secondly, cotransplantation improved immune functional recovery. Non-specific lymphocytes proliferation reaction induced by ConA and LPS increased in cotransplantation group, and so did for allogeneic mixed-lymphocyte reaction. CONCLUSION: Hematopoietic reconstitution and immune reconstitution were significantly enhanced by MSCs cotransplanted with BM.