首页 > 文献资料
-
补体片段C4d与肾移植抗体介导排异反应的病理诊断
同种异体肾移植排异无非是以T细胞介导的细胞性排异和以抗体介导的体液性排异两种形式.在组织学上虽然对肾移植急性细胞性排异已有较好的认识,但对抗体介导的体液排异由于病变不典型,缺乏足够的认识和共识[1].近10年来,补体片段C4d在移植肾毛细血管上沉积与抗体介导排异的相关性研究备受瞩目[2-4],2007年发表的Banff分类也将C4d免疫阳性染色作为诊断急、慢性抗体介导排异的标准之一[5].我们就移植肾抗体介导排异、补体片段C4d及C4d在排异诊断中的意义做一综述如下.
-
基因表达谱监测心脏移植排斥反应
IntroductionDespite improved immunosuppression, rejection still accounts for significant morbidity and mortality after heart transplantation[1].Any method that improves early detection and hence treatment of rejection is likely to lead to improved long-term survival.Serial surveillance endomyocardial biopsies (EMB) following cardiac transplantation have become an integral component of post-transplant management.However, EMB is invasive, expensive, variable[2] and causes low but definitemorbidity[3].
-
VEGF在大鼠原位肝移植急性排斥反应中的表达研究
目前从血管内皮细胞和炎症反应相互作用横向联系角度来进一步探讨其机制的研究还非常罕见.参与移植器官急性排斥反应过程的细胞因子有多种,但血管内皮生长因子(vascular endothelial growth factor,VEGF)起着介导免疫炎症反应和血管新生相互作用.材料与方法1.动物模型与分组:采用经典的二袖套法建立近交系DA(RT1a),LEW( RT11)原位肝脏移植急性排斥反应模型,进行大鼠原位肝移植.48只大鼠分2组:对照组24只,LEW( RT11 )-DA(RT1a)大鼠间移植为同系移植耐受(syngeneic OLT,OLTS),实验组24只,DA( RT1a)-LEW( RT11)大鼠间移植为同种异体移植急性排斥(acute allograft rejection OLT,OLTR).对照组和实验组均按移植术后1,3,7天分亚组,每个亚组8只大鼠.
-
BACKGROUND:Corneal lymphangiogenesis is beneficial to the transport of corneal antigenic materials, and accelerates the process of antigen presentation, thereby playing an important role in corneal immunity. However, due to the paral el outgrowth of corneal blood and lymphatic vessels in transplanted corneas, it is often difficult to accurately evaluate the role of corneal lymphatic vessels in allograft rejection. OBJECTIVE:To explore the development of corneal lymphangiogenesis and angiogenesis in transplanted rat corneas after the blockade of vascular endothelial growth factor C (VEGF-C). METHODS:130 rats used to establish corneal al ogenic transplantation models were equally randomized into two groups:the anti-VEGF-C group and the control group. VEGF-C was blocked in the anti-VEGF-C group by intraperitoneal injection of neutralizing monoclonal anti-VEGF-C antibody every other day for 2 consecutive weeks. Meanwhile, rats in control groups received intraperitoneal injections of saline. Corneal angiogenesis and lymphangiogenesis were characterized using whole mount immunofluorescence, and the immune rejection of the grafts was evaluated by scoring the rejection index (RI). In addition, the expression of VEGF-C was examined by real-time PCR. The relationship of corneal lymphangiogenesis and angiogenesis to RI in transplanted corneas was also characterized. RESULTS AND CONCLUSION:VEGF-C expression was markedly downregulated after VEGF-C blockade. Corneal lymphangiogenesis developed in parallel with corneal angiogenesis in the control group. While there was a mild reduction in blood vessel area (BVA) and a significant decrease in lymphatic vessel area (LVA) in the anti-VEGF-C group (P<0.05). In addition, RI was positively correlated with BVA (P<0.05) and LVA (P<0.05) in the control group. However, although RI was significantly correlated with BVA (P<0.05) in the anti-VEGF-C group, the correlation between RI and LVA was not statistically significant (P>0.05). the graft survival time in the anti-VEGF-C group was significantly increased compared with that in the control group (P<0.05). Our results show that the outgrowth of lymphatic vessels is separated from that of blood vessels in transplanted corneas by blocking VEGF-C. The blockade of VEGF-C has a significant role in preventing corneal lymphangiogenesis in corneal beds, which results in higher al ograft survival rates.
-
肝移植免疫排斥反应的发生及危险因素分析
肝移植免疫排斥反应特点肝移植免疫排斥反应根据发生时间及病理特点分为超急性免疫排斥反应、急性排斥反应和慢性排斥反应3种.