白消安注射法建立昆明小鼠精原干细胞移植受体模型

【目的】 通过对6周龄昆明小鼠腹腔内单次注射不同剂量的白消安来制作精原干细胞移植受体模型。【方法】将104只昆明小鼠随机分成4组，分别注射0（对照组，注射等量的白消安溶解液二甲基亚砜（DMSO），10，20和30 mg/kg白消安，于注射白消安后5，7，9，11和13周记录小鼠的死亡数、小鼠睾丸外观体积、小鼠睾丸质量和小鼠体质量，计算睾丸指数；通过组织学观察注射不同剂量白消安后小鼠曲细精管精子恢复情况，并检测受体小鼠血液中红细胞和白细胞数量的变化。【结果】 注射0（对照组），10，20和30 mg/kg白消安13周后，小鼠死亡率分别为0（0/22），11.54%（3/26），17.86%（5/28）和89.29%（25/28）。10 mg/kg白消安组小鼠的睾丸指数在注射后5，7和9周显著小于对照组（P＜0.05），而在注射后11和13周，与对照组差异不显著（P＞0.05）；在注射后不同时间，对照组和10和20 mg/kg白消安组的睾丸指数均显著高于20 mg/kg白消安组（P＜0.05）。在注射白消安5，7，9，11和13周后，对照组曲细精管上皮无变化；10和20 mg/kg白消安组有完整精子发生的曲细精管占总曲细精管的百分比分别为（49.56±8.23）%，（66.61±6.13）%，（80.24±10.42）%，（93.87±3.23）%，（92.49±4.58）%；（8.73±9.22）%，（9.89±6.39）%，（29.21±12.31）%，（49.64±3.59）% 和（81.99±4.98）%。受体小鼠红细胞和白细胞数量均随着处理时间及白消安处理剂量的变化而变化。【结论】腹腔内注射20 mg/kg白消安小鼠的死亡率、睾丸指数均较低，中空的曲细精管数量多，且恢复较慢，适于做精原干细胞移植的受体，合适的移植时间是白消安处理后5～7周。

Beneficial effect of an antibody against interleukin-2 receptor (daclizumab) in an experimental model of hepatocyte xenotransplantation

AIM: To investigate the use of Daclizumab (Dmab) as an immunosuppressive agent in an experimental model of hepatocyte xenotransplantation (XenoTx) in rats with fulminant hepatic failure (FHF). METHODS: Two white male New Zealand rabbits were used as donors and 68 Wistar rats as recipients. FHF was induced by intravenous application of dimethylnitrosamine (DMNA). The isolated hepatocytes of the rabbits were xenotransplanted into the spleen of the rats 24 h after FHF induction. Group A (n = 13): no treatment; Group B (n = 14): FHF and XenoTx; Group C (n = 14): FHF and XenoTx and cyclosporin (CsA); Group D (n = 14): FHF and XenoTx and Dmab; Group E (n = 13): FHF and XenoTx and CsA and Dmab. The rats were followed for 15 d. RESULTS: Statistical analysis showed better survival among groups D (92.86%) and E (76.92%) compared to group A (all rats died after 72 h), group B (28.57%) or group C (71.43%), although the differences were not statistically significant. Biochemical evaluation of the liver enzymes and histology confirmed satisfactory function and engraftment, respectively. CONCLUSION: This experimental model has shown the safe, effective and beneficial use of Dmab in a xenotransplantation model of rabbit hepatocytes in rats.