供体淋巴细胞在GVHD模型小鼠组织器官中迁移和分布的动态观察

本研究应用小鼠GVHD模型探讨异基因T淋巴细胞在移植受体体内的迁移和分布。将C57BL／6的骨髓细胞和转基因荧光C57BL／6小鼠的脾淋巴细胞输入经8Cy全身照射的BALB／c小鼠，建立eGFP标记供体淋巴细胞的GVHD小鼠模型；应用荧光显微镜和流式细胞术观测GVHD模型中eGFP^＋细胞的分布；ELISA法检测GVHD靶组织中趋化因子MIP—1α水平的改变。结果表明：①输入脾细胞和骨髓细胞第8天后出现GVHD临床及病理表现；②CVHD模型中，受体鼠肝、皮肤、肠、脾、肺、舌有eGFP^＋细胞浸润；③GVHD小鼠肝、脾eGFP^＋细胞中CD4^＋、CD8^＋细胞比例均逐渐升高；④GVHD鼠脾、肝组织中MIP—1α水平升高，脾中MIP-1α水平高峰出现于移植后第3天，肝中MIP—1α水平高峰出现于移植后第7天。结论：除肝、肠、皮肤外，肺、舌可能也是GVHD靶器官。肝、脾组织中供体淋巴细胞浸润伴随MIP—1α水平的升高。

Migration and Distribution of Allogeneic T Lymphocytes in Organs of Graft-Versus-Host Disease Mouse Model

This study was aimed to investigate the migration and distribution processes of allogeneic donor T lymphocytes in the organs of recipient mice. GVHD model was established by transfusion of the splenocytes of eGFP transgeneic C57BL/6 mice together with born marrow cells harvested from C57BL/6 mice into BALB/c mice underwent 8.0 Gy total body irradiation. The migration and homing of eGFP(+) cells were tracked by stereo-fluorescent microscopy or inverted fluorescent microscopy and flow cytometry. The enzyme linked immunosorbent assay (ELISA) was performed on supernatants from the tissue homogenates to detect the amount of MIP-1alpha. The results indicated that GVHD clinical manifestation and pathological changes of organs appeared on day 8 post transplantation. eGFP-positive donor T cells in recipient organs were observed by inverted fluorescence microscope in frozen section, or by stereo-fluorescence microscopy in living organs, such as liver, spleen, skin, lungs, bowels, and tongue. The highest expression of MIP-1alpha was on day 7 post transplantation in the liver (491.3 +/- 32.1 pg/ml), and day 3 post transplantation in the spleen (881.5 +/- 45.2 pg/ml), respectively (P < 0.05). It is concluded that GVHD was induced by splenocytes of eGFP transgeneic C57BL/6 mice. eGFP(+) cells in the organs can be observed by fluorescent microscopy. In this GVHD model, donor T cells proliferate and infiltrate in liver, skin, bowels, as well as lungs and tongue. MIP-1alpha may be in relation with the infiltration of T lymphocytes in liver and spleen.