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目的 探讨干预慢性迟发性超敏反应(DTH)与CD8^+T淋巴细胞的细胞毒等效应机制对同种小鼠心脏移植后慢性排斥反应的影响。方法 建立小鼠颈部异位心脏移植模型,实验组以BALB/c小鼠为供者,C57BL/6小鼠为受者,术后0、2、6及14d腹腔注射抗CD8单克隆抗体(抗CD8单抗)200μg/d,术后0、2及4d腹腔注射抗CD40L单克隆抗体(抗CD40L单抗)250μg/d;同系移植对照组供、受者均为BALB/C小鼠,术后同期腹腔注射等量生理盐水;同种移植对照组以BALWc小鼠为供者,C57BL/6小鼠为受者,术后不使用上述单抗。观察各组移植心的存活时间及移植心组织病理学变化。结果同种移植对照组移植心的平均存活时间为7.3d;实验组与同系移植对照组移植心的存活时间均超过60d。同种移植对照组移植心呈典型急性排斥反应病理学改变;同系移植对照组移植心组织未见明显病理变化;实验组移植心呈现血管周围炎、间质纤维化和血管内膜增生等慢性排斥反应组织病理改变。结论 清除CD8^+T淋巴细胞和阻断CD40/CD40L通路的处理方案虽可预防急性排斥反应,显著延长移植心的存活时间,但并不能阻止慢性排斥反应的发生。 相似文献
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目的 探讨冬虫夏草提取物抑制大鼠移植动脉硬化的效果及其机制.方法 制备大鼠腹主动脉移植模型,分为4组进行实验:同系对照组供、受者均为Lewis大鼠,生理盐水灌胃60d;同种对照组,以Brown-Norway大鼠(BN大鼠)为供者,Lewis大鼠为受者,生理盐水灌胃60d;低剂量实验组,以BN大鼠为供者,Lewis大鼠为受者,以冬虫夏草提取物(1.5 g·kg-1·d-1)灌胃60 d;高剂量实验组,以BN大鼠为供者,Lewis大鼠为受者,以冬虫夏草提取物(3.0g·kg-1·d-1)灌胃60d.于移植后60 d取移植动脉,HE染色,进行病理学观察;免疫组织化学和蛋白质印迹法检测血管内皮生长因子(VEGF)和血小板衍生生长因子BB(PDGF-BB)在移植动脉中的表达.酶联免疫吸附试验检测受鼠血清中VEGF和PDGF- BB含量.结果 同系对照组移植动脉形态正常;同种对照组移植动脉呈移植物血管病表现,血管内膜显著增厚;2个实验组移植动脉呈内膜炎症改变,内膜厚度与同种对照组相比,差异有统计学意义(P<0.05).同种对照组移植动脉中VEGF和PDGF-BB的表达高于同系对照组(P<0.05);2个实验组移植动脉中VEGF和PDGF-BB的表达低于同种对照组(P<0.05).同系对照组受鼠血清中几乎无VEGF和PDGF-BB;同种对照组血清中VEGF和PDGF-BB浓度高于同系对照组(P<0.05);和同种对照组相比较,2个实验组血清VEGF和PDGF-BB浓度较低(P<0.05).结论 冬虫夏草提取物能明显抑制动脉内膜的增生,可缓解慢性排斥反应所致的移植动脉硬化,这种保护作用可能与下调VEGF和PDGF-BB表达有关. 相似文献
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目的 评价具有免疫抑制作用的CD8+CD28-调节性T淋巴细胞(Treg)体内输注在抑制大鼠肝移植急性排斥反应中的作用.方法 建立近交系大鼠肝移植自发耐受及急性排斥反应模型.从肝移植自发耐受模型受者脾脏中分离CD8+CD28-Treg,于急性排斥反应模型建立前1 d输注给受者,比较不同的输注组间受者的存活时间和移植肝病理学表现.结果 来自自发耐受模型(LEW大鼠为供者,DA大鼠为受者)的CD8+CD28-Treg输注可以延长急性排斥反应模型(LEW大鼠为供者,BN大鼠为受者)受者的存活时间,由(14.0±2.2)d延长至(24.0±3.0)d(P<0.01),移植肝病理学显示排斥反应程度减轻.结论 大鼠肝移植自发耐受模型受者体内诱导的CD8+CD28-Treg具有抑制急性排斥反应的作用,该免疫抑制作用具有抗原特异性. 相似文献
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供者骨髓细胞骨髓腔内输注联合低剂量照射延长大鼠复合组织移植物存活时间 总被引:2,自引:0,他引:2
目的探讨供者骨髓细胞骨髓腔内输注联合低剂量照射对大鼠复合组织移植物的影响。方法以SD大鼠为供者,Wistar大鼠为受者,实验分4组进行:A组仅进行肢体移植;B组在肢体移植前1d,受者接受亚致死量60Co照射(4.5Gy/次,共2次,间隔4h),同时腹腔内注射氟达拉滨(50mg/kg);C组于肢体移植当天受者骨髓腔内输注供者骨髓细胞;D组在B组的基础上,受者于肢体移植当天骨髓腔内输注供者的骨髓细胞。所有受者术后均不用免疫抑制剂。术后观察移植物的存活情况及排斥反应征象,对D组存活超过120d的受鼠进行单向混合淋巴细胞反应以及SD大鼠、DA大鼠皮肤移植,同时通过组织学检查,了解受鼠的移植物抗宿主病(GVHD)情况。结果与其它实验组相比,D组移植物的存活时间显著延长(P<0.01),达(284.2±11.8)d,未见排斥反应征象,也未观察到GVHD,其它组均于术后近期发生排斥反应(<20d);D组大鼠对供者的淋巴细胞呈现低反应性,移植的供者同系大鼠的皮肤得以长期存活,而对第三方DA大鼠的淋巴细胞和皮肤呈现强烈的免疫反应。结论供者骨髓细胞骨髓腔内输注联合低剂量照射和短期氟达拉滨应用,在不用免疫抑制剂的情况下,能显著延长移植复合组织的存活时间。 相似文献
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大鼠小肠移植后外周血CD45RC+细胞和CD45RC-细胞比值的变化及意义 总被引:1,自引:1,他引:0
目的探讨可用于诊断小肠移植后排斥反应的指标.方法采用F334大鼠建立同系全小肠移植模型,以近交系F334大鼠和BN大鼠建立同种全小肠移植模型,术后采用流式细胞仪连续测定外周血CD4+、CD8+细胞中CD45+亚群以及CD45RC+细胞与CD45RC-细胞比值(CD45RC+/CD45RC-)的变化,同期进行移植肠组织病理学检查.结果同系移植组受者术后均获长期存活(>28 d);同种移植组受者术后存活(12.0±1.3)d,出现中、重度排斥反应.术后外周血CD4+CD45+和CD8+CD45+细胞的变化,两组间的差异无统计学意义;同系移植组CD4+CD45RC+/CD4+CD45RC―及CD8+CD45RC+/CD8+CD45RC―在术后3 d升高,然后迅速降至手术当天的水平,同种移植组上述指标术后均维持较高水平.结论动态观察CD4+CD45RC+/CD4+CD45RC-较适于监视排斥反应的发展过程,而CD8+CD45RC+/CD8+CD45RC-更适于排斥反应的早期诊断. 相似文献
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大鼠肝移植模型的建立及排斥品系的选择 总被引:3,自引:0,他引:3
目的探讨大鼠原位肝移植手术技巧及排斥反应品系的选择。方法封闭群SD、Wistar大鼠各30只,近交系Lewis,BN大鼠各30只。通过改良双袖套法行原位肝移植,分别于术后第7 d、30 d取肝组织行病理检查,观察手术成功率、并发症和术后生存率。结果封闭群SD→Wistar大鼠48 h、1个月存活率为93.3%和89.2%;近交系Lewis→BN大鼠48 h存活率为90.0%,并于术后11 d内全部死亡。病理组织学结果示封闭群肝组织排斥反应明显轻于近交系。结论熟练的显微外科技术是模型成功的关键。SD→Wistar大鼠出现自然耐受;Lewis→BN是较理想的大鼠肝移植急性排斥反应模型。 相似文献
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目的 探讨磁共振成像(MRI)监测胰岛移植物的可行性.方法 在体外利用超顺磁铁氧化物(SPIO)标记大鼠胰岛,然后移植至用链佐星诱导的糖尿病大鼠肝脏内,同系移植标记组供、受者均为Wistar大鼠,同种移植标记组供者为Lewis大鼠,受者为Wistar大鼠.并设同系移植对照组(供、受者均为Wistar大鼠)和同种移植对照组(供者为Lewis大鼠,受者为Wistar大鼠),胰岛移植物未经SPIO标记.术后定期利用MRI监测肝内胰岛移植物,监测受者的血糖,并抽取动物,对其肝脏进行病理检查.结果 只有SPIO标记的胰岛移植物能被MRI检测到.经MRI检测,同系移植标记组术后第1、2、3周胰岛移植物的相对数量分别为(89.6±2.2)%、(87.5±14.4)%和(74.5±19.5)%,同种移植标记组术后第1、2、3周的相对数量分别为(43.2±17.2)%,(36.5±13.0)%和(26.5±17.4)%,组间相同时间点两两比较,差异有统计学意义(P<0.05).同系移植标记组血糖始终维持在正常水平,肝脏中能检测到胰岛素免疫组化和普鲁士蓝染色双阳性细胞;而同种移植标记组移植1周后的血糖水平超过16.8 mmol/L,肝脏中无法找到形态完整的胰岛.结论 MRI监测结果与血糖监测和病理检查结果一致,但它可直观、无创、连续地监测胰岛移植物在体内分布和存活情况. 相似文献
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目的建立稳定的近交系大鼠肝移植急性排斥反应模型,确立研究大鼠肝移植急性排斥反应的最佳时间点。方法采用"双袖套法"建立40例Lewis→BN近交系大鼠的肝移植急性排斥反应模型,根据Banff分级评分方案评价排斥反应的强度。结果 40例Lewis→BN近交系大鼠的肝移植模型中,发生急性排斥反应于术后第1~3 d处于上升期,术后第3~7 d上升最为迅速,术后第7~9 d处于平台期。结论 Lewis→BN的近交系大鼠原位肝移植模型可产生急性排斥反应,术后第3~9 d为研究急性排斥反应的最佳时间。 相似文献
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胸腺接种肝特异性抗原对同种肝移植排斥反应的作用 总被引:1,自引:0,他引:1
目的 研究肝特异性抗原在同种肝移植免疫反应中的作用及其意义。方法 实验大鼠随机分为 3组。Ⅰ组 :为同基因移植对照组 ,供、受者均为Wistar大鼠 ;Ⅱ组 :为异基因移植组 ,供、受者分别为SD和Wistar大鼠 ;Ⅲ组 :为异基因移植前胸腺注射组 ,供、受者分别为SD和Wistar大鼠 ,术前 1周用供者肝特异性抗原 (LSA) 10mg对受者进行胸腺注射。观察和检测术后一般状态、生存时间、病理学排斥分级及脾细胞核因子 κB活性等 ,确定各组移植后的排斥反应情况及机体的免疫状态。结果 Ⅰ组大鼠术后一般状态好 ,无排斥反应发生 ;Ⅱ组大鼠体重进行性减轻 ,术后 9~ 13d内全部死亡 ,平均存活时间 (10 .7± 0 .51)d ,排斥反应明显 ;Ⅲ组 6只大鼠 ,2只存活 2 4d ,1只存活 2 7d ,2只长期存活 ,1只于术后 15d死于胆道梗阻。术后一般状态同Ⅰ组 ,排斥分级明显低于Ⅱ组 (P <0 .0 5) ;Ⅰ组仅 5d和 7d时间段检测到较低的核因子 κB活性 ,Ⅱ组各时间段均检测到明显的核因子 κB活性 ,Ⅲ组各时间段核因子 κB活性均明显低于Ⅱ组 (P <0 .0 5)。结论 肝特异性抗原直接参与了移植肝的排斥反应 ;胸腺接种肝特异性抗原能减轻同种肝移植排斥反应的发生 相似文献
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Role of immunosuppression in recurrence after liver transplantation for diethylnitrosamine-induced tumors in rats 总被引:3,自引:0,他引:3
A. Ceriello F. Mezza S. Cozzolino G. Pettinato A. Mancini W. Santaniello F. Calise O. Cuomo 《Transplant international》1994,7(S1):204-207
Abstract Hepatocellular carcinoma is one of the world's most common malienant diseases, with an increasing incidence related to liver cirrhosis. The purpose of the study was to evaluate the role of immunosuppression in recurrence in rats transplanted after liver tumor induction by diethylnitrosamine (DENA), which has proved to be a reliable carcinogen. In 14-week-old Lewis rats weighing 200 g, tumors were induced by the oral administration (5 mg/100 ml in drinking water ad libitum) of DENA for 13 weeks. Orthotopic liver transplantation (OLT) was performed after 4 weeks' latency. In the Lewis/Lewis rats weighing 200 g, tumors sporin A (CsA) treatment, median survival was 199-days with no recurrence or metastasis. In the BN/Lewis group with no CsA (5 ats) median survival was 144 days. All rats died due to rejection. In the other BN/Lewis group (10 rats), OLT was followed by CsA administration (7.5 mg/kg). Median survival was 161 days. In three rats (218 days), there was liver tumor recurrence; in two rats (137.5 days), kidney and lung metastases were found. The remaining rats died of septic complications. In the Lewis/Lewis + CsA group (10 rats), median survival was 131 days with 5 recurrencies and/or metastases. Two rats are still surviving at 84 and 88 days. Our results suggest that the DENA model is reliable; it proved to have a similar carcinologic pattern to HCC in man. Moreover, immunosuppression seems to play an important role in determining recurrence. Further studies are needed to investigate the efficacy of chemotherapy agents pre- and post-transplantation. 相似文献
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目的 观察肝移植后肝内吲哚胺2,3-双加氧酶(IDO)在体活性,探讨肝移植免疫排斥对IDO酶活性的影响.方法 施行假手术、同品系(SD→SD)及异品系(Wistar→SD)大鼠肝移植各10例.术后在肝内植入微透析探针,连续收集透析液,HPLC测定色氨酸及犬尿氨酸浓度,以表明IDO酶在体活性.结果 假手术、同品系及异品系组在术后2周内色氨酸浓度均值分别为97.14、85.71、53.07nmol/L(P<0.05),犬尿氨酸浓度均值分别为3.46、14.58、46.79 nmol/L(P<0.05),异品系组术后第2天犬尿氨酸浓度即开始增加(20.03nmol/L),第7天达到峰值(70.75nmol/L),此后保持在40.00nmol/L水平以上.结论 同品系或异品系均能诱导移植后肝内IDO酶活性增加,且异品系大鼠肝移植后IDO酶活性表现早而强烈.Abstract: Objective To observe the activity of indoleamine 2, 3-dioxygenase (IDO) enzyme in vivo after rat liver transplantation, and the effects of liver transplantation rejection on IDO enzyme activity.Methods Ten SD rats were subjected to othotopic liver transplantations respectively in allogenic OLT group (SD→SD) and heterogenic OLT group (Wistar→SD). In the other 10 SD rats, the blood supply to the liver was obstructed for 15 min for simulating the anhepatic period in the OLT group ( sham group). An in vivo rat liver microdialysis-HPLC system was established on the day I after OLT. The concentrations of kynurenine and tryptophan in dialysate samples were continuously monitored quantitatively and reproducibly for more than 2 weeks in the same animal. Results The average concentrations of tryptophan in dialysate were 97. 14, 85.71, 53.07 nmol/L respectively in the sham, allogenic OLT and heterogenic OLT groups respectively. The concentrations of kynurenine were 3.46, 14. 58, 46.79 nmoL/L in the sham, allogenic OLT and heterogenic OLT groups respectively. The concentration of kynurenine was increased significantly on the day 7 after surgery in heterogeneic OLT group (70. 75 nmol/L). Conclusion The transplantation surgery can induce the activity of IDO enzyme in vivo and accelerate the metabolism of tryptophan in the liver allografts. 相似文献
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目的观察紫杉醇在大鼠原位肝移植中的作用及其对细胞毒性T淋巴细胞(CTL)的影响。方法建立Wistar→SD大鼠肝移植的急性排斥模型。将大鼠分为对照组(阻断全肝血流)、急排组(Wistar→SD肝移植)、紫杉醇组(Wistar→SD肝移植,紫杉醇腹腔注射0.75mg·kg-1·d-1,观察生存时间、病理改变、生化指标及CTL、T淋巴细胞凋亡情况。结果紫杉醇组大鼠的术后存活时间高于急排组,[(18.2±1.5)dvs(8.8±1.9)d,P0.01)。急排组的HE评分(Banff)高于紫杉醇组(7.80±0.83vs4.80±0.82,P0.01)。紫杉醇组的白蛋白水平高于急排组(P=0.003);紫杉醇组的谷丙转氨酶水平低于急排组(t=25.23,P0.01)。CTL检测中,急排组的特异性杀伤靶细胞的百分率均高于紫杉醇组(P0.01)。急排组的T淋巴细胞的凋亡率低于紫杉醇组[(7.16±1.56)%vs(16.47±2.51)%,P0.01]。结论紫杉醇在大鼠肝移植中具有免疫抑制作用,可能通过诱导T淋巴细胞凋亡来抑制T淋巴细胞的活化发挥作用。 相似文献
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目的 观察肝移植排斥反应中移植肝脏内糖皮质激素诱导的肿瘤坏死因子受体配体(GITRL)的表达.方法 采用Kamada's二袖套法建立从Lewis到Brown Norway(BN)大鼠的肝移植排斥模型为排斥组(n=5),从BN到BN的肝移植模型为耐受组(n=5).术后24h,抽取血液,取肝脏及分离库普弗(Kupffer)细胞,检测肝脏上GITRL及肿瘤坏死因子(TNF)-α的表达,Kupffer细胞上GITRL的表达,检测血清及细胞上清液中TNF-α的表达.免疫组织化学染色强度采用Image-Pro Plus 6.0图像分析软件分析.结果 免疫耐受组和排斥组肝脏内的CITRL的平均染色强度分别为0.113±0.007和0.270±0.018(P<0.05),TNF-α平均染色强度分别为0.114±0.004和0.141±0.005(P<0.05),耐受组和排斥组的Kupffer细胞GITRL平均染色强度分别为0.206±0.017和0.337±0.018(P<0.05),Kupffer细胞的培养上清液中,耐受组和排斥组TNF-α的值分别为(68.66±21.12)、(178.33±29.39)ng/L(P<0.05).结论 在排斥的早期阶段肝脏及Kupffer细胞的GITRL表达增高,监测和干扰GITRL可能有益于肝移植急性排斥反应的早期诊断和处理.Abstract: Objective To investigate te changes of glucocorticoid induced tumor necrosis factor receptor ligand (GITRL) in hepatic allograft rejection. Methods Liver transplantation from Lewis rats (n = 5 ) to Brown Norway (BN) rats was performed by Kamada' s two-cuff technique as acute rejection group. Liver transplantation from BN to BN rats ( n = 5 ) was performed as tolerance group. Recipients were sacrificed at 24th h postoperation. Blood samples were collected and grafts were harvested, then Kupffer cells were isolated. GITRL and tumor necrosis factor (TNF)-α protein expression in the hver was tested by immunohistochemistry, and the GITRL expression in Kupffer cells by immunocytochemistry. Enzyme linked immunosorbent assay (ELISA) was employed to detect the changes of TNF-α protein in the serum and supernatant. The staining intensity was analyzed by Image-Pro Plus 6. 0 image analysis software. Results At 24th h postoperation, the liver GITRL expression levels in tolerance and rejection groups were 0. 113 ± 0. 007 and 0. 270 ±0. 018, respectively (P <0. 05). The TNF-α expression levels in the liver in tolerance and rejection groups were 0. 114 ± 0. 004 and 0. 141 ± 0. 005 respectively ( P < 0.05 ). The GITRL expression levels in Kupffer cells in tolerance and rejection groups were 0. 206 ±0. 017 and 0. 337 ±0. 018 respectively (P <0. 05 ). As compared with tolerance group (68. 66 ±21.12) ng/L, TNF-α protein expression levels were up-regulated in the supernatant of rejection group ( 178.33 ± 29. 39 ) ng/L ( P < 0. 05 ).Conclusion The expression of GITRL in the liver and Kupffer cells was increased in the early stage of rejection, and monitoring and interfering GITRL may be useful for the early diagnosis and management of an acute rejection in liver transplantation. 相似文献
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Bone marrow-derived liver stem cell and mature hepatocyte engraftment in livers undergoing rejection 总被引:44,自引:0,他引:44
BACKGROUND: The definitive therapy for end-stage liver disease is orthotopic liver transplantation (OLT). However, rejection is still a major cause of mortality and morbidity following OLT. Hepatocyte transplantation has been used experimentally to treat liver diseases. The aim of this study was to investigate whether bone marrow-derived liver stem cells (BDLSC) and mature hepatocytes could repopulate transplanted livers undergoing rejection. METHODS: OLT was carried out from D'Agouti (C3-positive female) into Lewis (C3-negative female) rats. BDLSC were transplanted from Lewis (male) into livers of D'Agouti (female) rats. Group A (n = 9) received intraportal normal saline. Groups B (n = 9) and C (n = 9) underwent intraportal transplantation of mature hepatocytes (Lewis female, 0.75 x 10(7)) and DBLSC (Lewis male, 5 x 10(4)) respectively. All groups received subtherapeutic immunosuppression (Cyclosporin 0.25 mg/kg/d) for 13 days. Liver repopulation was assessed using immunohistochemistry (C3 antigen-negative cells), in-situ hybridization, (Y-chromosome-positive BDLSC) and histologic assessment (hematoxylin and eosin) for rejection. RESULTS: BDLSC and mature hepatocytes repopulated 62 +/- 12.3% and 2.5 +/- 1.7% of rejecting livers, respectively. BDLSC demonstrated formation of hepatic lobules and portal triads with little evidence of rejection 36 days after discontinuation of immunosuppression. CONCLUSIONS: BDLSC can repopulate livers undergoing severe rejection. Moreover, BDLSC can differentiate into hepatocytes and cholangiocytes. This finding may have important clinical implications. 相似文献
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目的 探讨大鼠肝移植排斥反应时γ干扰素(IFN-γ)及白细胞介素10(IL-10)的表达及意义.方法 采用改良的Kamada"二袖套法"制备大鼠原位肝移植模型,同系移植组供、受者均为SD大鼠;同种异体移植组的供者为Wistar大鼠,受者为SD大鼠;另设假手术组.术后7 d处死动物,观察移植肝脏的组织学变化,检测血清IFN-γ和IL-10的含量,以及移植肝脏内IFN-γ和IL-10 mRNA的表达.结果 同种异体移植组移植肝脏有较多坏死肝细胞,汇管区及中央静脉周围可见以淋巴细胞为主的炎症细胞浸润,胆管上皮细胞可见胞浆空泡变性、核固缩或碎裂,整个肝小叶结构紊乱.同系移植组肝脏组织结构仅有轻度缺血再灌注损伤表现,汇管区有较少炎症细胞浸润,胆管上皮细胞结构和肝小叶结构基本正常.同种异体移植组血清IFN-γ为(386.7±14.4)Pg/ml,明显高于同系移植组的(159.8±16.5)pg/ml(P<0.05);同种异体移植组血清IL-10为(126.3±13.1)pg/ml,明显低于同系移植组的(288.3±17.1)pg/ml(P<0.05).同种异体移植组移植肝组织内IF-γ mRNA表达水平明显高于同系移植组(P<0.05),而IL-10 rnRNA表达水平明显低于同系移植组(P<0.05).结论 大鼠肝移植排斥反应时IFN-γ表达明显升高,IL-10表达明显降低;T_H1/T_H2型细胞因子的动态平衡可能在大鼠肝移植排斥反应中起着重要作用. 相似文献
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目的 探讨大鼠原位肝移植(OLT)模型的技术改进方法,并观察移植后的排斥反应。方法 将“二袖套法”大鼠肝移植技术进行了改进;并行SD→SD,SD→Wistar大鼠肝移植各30例,观察术后排斥情况。结果 全组肝移植手术无肝期约为15min。大鼠无手术死亡。SD-SD大鼠肝移植后3周内存活率为97%;SD→Wistar大鼠肝移植后8~15d死亡,组织病理学证实存在不同程度的排斥反应。结论 采用该改良大鼠肝移植方法可明显缩短手术时间,降低术后并发症,提高移植大鼠的术后生存率。SD-Wistar大鼠的肝移植可作为较理想的研究肝移植排斥反应的动物模型。 相似文献