雷帕霉素对肝移植大鼠皮下移植瘤生长的影响

目的探讨雷帕霉素对肝移植大鼠皮下移植瘤生长的影响。方法建立大鼠肝移植模型后实验分为五组,Ⅰ组:以Wistar大鼠作为供体,SD大鼠作为受体,术后不接受任何治疗作为急性排斥对照组。Ⅱ组:以SD大鼠作为供体及受体,术后3 d在左肩胛区皮下接种腹水瘤Wlaker- 256细胞,生理盐水灌胃作为皮下肿瘤生长的对照组。Ⅲ、Ⅳ、Ⅴ组:均以Wistar大鼠作为供体,SD大鼠作为受体,术后分别服用环孢素(每日20mg,/kg体重,灌胃)、他克莫司(每日1 mg/kg体重,灌胃)和雷帕霉素(每日1 mg/kg体重,灌胃),术后3 d在左肩胛区皮下接种腹水瘤Wlaker-256细胞。每周3次记录Ⅱ-Ⅴ组受体大鼠皮下肿瘤生长情况,绘制成瘤曲线;并于皮下接种肿瘤后14 d处死大鼠,检测受体大鼠的肝功能、移植肝病理及皮下肿瘤大小。结果与急性排斥大鼠(Ⅰ组)比较,接受免疫抑制剂治疗的各组受体大鼠(Ⅲ～Ⅴ组)均未出现严重的急性排斥反应;同时,与生理盐水灌胃的同基因肝移植术后皮下荷瘤大鼠(Ⅱ组)比较,雷帕霉素明显抑制了大鼠皮下肿瘤的生长[(1.41±0.87)与(3.65±0.87)cm3,P<0.05],环孢素及他克莫司则促进了皮下肿瘤的生长[(9.56±2.81)与(3.65±0.87)cm3,P<0.01;(8.11±1.69)与(3.65±0.87)cm3,P<0.01]。结论雷帕霉素在有效保护移植物的同时抑制了移植受体体内肿瘤的生长;环孢素和他克莫司抑制了机体的排斥反应,但也同时促进了受体体内肿瘤的生长。     

大鼠肝移植(LTx)急性排斥反应(AR)血清蛋白质组学分析

 
目的  探究肝移植(liver transplantation,LTx)急性排斥反应(acute rejection,AR)血清蛋白质组学的变化,寻找与排斥反应相关的血清标志物。方法  建立Lewis→BN大鼠肝移植模型,以BN→BN大鼠肝移植为对照组,根据肝移植物AR的反应程度进行分组,取各组大鼠血清样本进行二维双向凝胶电泳(two dimensional difference gel electrophoresis,2D-DIGE)及质谱(mass spectrometry,MS)分析,鉴定表达有差异的蛋白质。结果  肝移植模型大鼠分为无排斥、轻度、中度和重度排斥4组,2D DIGE共发现30个蛋白斑点,用MS分析排除重复蛋白斑点之后鉴定出14个蛋白质,根据功能可分为4类。第1类为与金属离子代谢相关的免疫调节蛋白,包括血红素结合蛋白、触珠蛋白前体、srprb Ba1-667和 preproapo A-I;第2类为先天性免疫相关的蛋白成分,包括补体C3、补体C4a、MBP-A、LOC500183蛋白和LOC299458蛋白;第3类为免疫调节多肽,包括T-kininogen 2、α-1巨球蛋白和大鼠α 1巨球蛋白受体结合域A链晶体结构;第4类为未分类蛋白,包括ORF2和rCG36664。结论  肝移植AR过程中血清多种蛋白质的含量发生改变,可能为重要的血清标志物。     

The dynamic balance of T-bet+VGATA-3+ and ROR-γt+ VFOXP3 + cells in rat liver allograft according to acute rejection severity

Objective To evaluate the dynamic balance of Th1, Th2, Th17 and iTreg cells in the process of acute rejection (AR) , orthotopic liver transplantation (OLT) was performed from LEW rats to BN rats. Methods OLT donated by male inbred LEW rats was performed on male inbred BN rats by Kamada' s two-cuff technique without liver arterial anastomosis, AR severity was graded using the Banff schema ,and the immunohistological method was applied to detect the expression of T-bet+, GATA-3+, RORγt+, and FOXP3+ cells in liver allografts. Results The number of T-bet+ cells (Control group: 19. 3±5. 1;Mild AR group: 63. 7±9. 7;Moderate AR group: 40. 9±13. 6;Severe AR group: 32. 3±3. 3) and RORγt + (Control group: 6. 5±1. 4;Mild AR group: 6.4±3. 1;Moderate AR group: 23. 2±9. 1;Severe AR group: 42. 6±14. 1) was significantly increased in mild, moderate and severe AR groups as compared with control group (all P<0.01). The number of GATA-3+cells (Control group: 7. 1±1. 3;Mild AR group: 13. 5±4. 8;Moderate AR group: 23. 2±9. 1;Severe AR group: 42. 6± 14. 1) showed no significant difference between mild AR group and control group (P>0. 05) , while it was significantly higher in moderate and severe AR group (P<0. 05 and P<0. 01). The number of FOXP3 + cells ( Control group;9.5±2.4;Mild AR group: 13. 5±4.8;Moderate AR group: 24.5 ±4.9;Severe AR group: 39.3±11.7) had no statistically significant difference (P>0. 05), but it was significantly decreased in moderate and severe AR group (all P<0.01). The ratio of T-bet + cells/GATA-3+cells was more significantly associated with AR than that of RORγt+cells/FOXP3+ cells in the early stage. Conclusion There is dynamic change in T-het+,GATA-3+,RORγt+and FOXP3+cells in the liver allografts.The T-bet+,GATA-3,RORγt'and FOXP3+cells were involved in AR,and the ratio of T-bet+cell/sGATA-3+cells was more significantly associated with AR than that of RORγt+cells/FOXP3+cells in the early stage.