嵌合体对异种骨髓移植后急性移植物抗宿主病的预防作用

目的 探讨嵌合体对异种骨髓移植后急性移植物抗宿主病(aGVHD)的预防作用。方法 用亚致死量^60Coγ射线全身照射＋输注小鼠骨髓细胞＋腹腔注射环磷酰胺的方法，建立嵌合体大鼠模型，然后观察嵌合体对异种骨髓移植致小鼠aGVHD的预防作用。结果 移植小鼠均出现典型aGVHD症状，未用aGVHD预防方案即输注无嵌合体大鼠骨髓和脾细胞的移植小鼠(A组)，死亡高峰在移植后10～12天。输注嵌合体大鼠细胞的移植BALB／C小鼠(B组)，生存时间较A组和C组(输注嵌合体大鼠的C57BL／6小鼠)显著延长，aGVHD症状及病理表现明显减轻。结论 诱导出的嵌合体能有效预防异种骨髓移植后的aGVHD，减轻其症状和病理损害，延长平均生存时间，而且此预防作用具有特异性。

Prophylactic effect of chimera on acute graft-versus-host disease after xenogeneic bone marrow transplantation

Objective To explore the effect of chimera on acute graft-versus-host disease (aGVHD) after xenogeneic bone marrow transplantation. Methods Chimera was produced by exposing rats to sublethal total body irradiation and mouse bone marrow transplantation plus intraperitoneal injection of CTX. Mice were divided into three groups. Mice in group A were transplanted with marrow cells of rats without chimera, mice in group B with marrow cells with chimera, and mice in group C with C57BL/6 of rat marrow cells with chimera. Prophylactic effect on the model of aGVHD in the mice induced after xenogeneic bone marrow transplantation was observed. Results All transplantated mice showed typical aGVHD signs. Animals in group A developed typical aGVHD, and death occurred in 10-12 days after transplantation. The mean survival time of group B were longer than that of group A and C, and the signs and histopathological changes of aGVHD in group B were less severe. Conclusion Xenogeneic chimera can prevent aGVHD, alleviate its symptoms and histopathological changes, and prolong mean survival time. The prophylactic effect is specific.