Immune hyporesponsiveness induced by immature dendritic cells prolonged rat kidney allograft survival
- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF ORGAN TRANSPLANTATION
- Issue:
- 4
- DOI:
- 10.3760/cma.j.issn.0254-1785.2005.04.003
- Key Word:
- 树突细胞;肾移植;免疫耐受
Abstract： 目的观察供者来源的未成熟树突状细胞(imDCs)联合骨髓移植(BMT)对大鼠移植肾的保护作用,并探讨其机制.方法DA(RT1a)大鼠为供者,Lewis(RT11)大鼠为受者,Wistar大鼠为无关第三品系.将实验动物随机分为5组,每组8只,进行不同的预处理后进行肾移植.(1)阴性对照组:受者不接受任何预处理;(2)imDCs诱导组:受者术前7d经尾静脉注射经60Co照射(30 Gy)灭活的、供者来源的未成熟树突状细胞2×107/只;(3)BMT诱导组:受者术前4 d经尾静脉注射供者来源的新鲜骨髓细胞2×108/只;(4)imDCs+BMT联合诱导组:受者术前7 d经尾静脉注射经60Co照射(30 Gy)灭活的、供者来源的未成熟树突状细胞2×107/只,术前4 d经尾静脉注射供者来源的新鲜骨髓细胞2×108/只;(5)第三品系组:预处理与imDCs+BMT联合诱导组相同,但供者肾脏来自Wistar大鼠.术后进行单向混合淋巴细胞反应(MLR);白细胞介素2(IL-2)逆转实验;体内细胞转移实验(DTH);流式细胞仪检测RT1a阳性细胞百分率.结果各组大鼠肾移植后平均存活时间分别为:阴性对照组(7.12±1.25)d;imDCs诱导组(24.38±3.20)d;BMT诱导组(7.87±2.10)d;第三品系组(6.63±1.06)d;而imDCs+BMT联合诱导组延长到(80.75±16.88)d;后者与上述4组比较,差异均有统计学意义(P＜0.01).免疫耐受的大鼠脾细胞增殖程度(SI值,3.41)明显低于对照组(7.56),P＜0.01;转移耐受的Lewis大鼠(FI值,0.55)明显低于对照大鼠(0.93),P＜0.01;在免疫耐受的受者体内检测到RT1a阳性细胞.结论术前输注供者来源的未成熟树突状细胞联合骨髓移植,可成功诱导受者产生免疫耐受,显著延长肾移植大鼠的存活时间.可能机制为特异性T细胞克隆无能、T细胞的负向免疫调节以及嵌合体的形成.
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