IMMUNOLOGIC UNRESPONSIVENESS : EXTRATHMIC T CELL DIFFERENTIATION AND PHENOTYPES OF CD8 T CELLS

移植前单次静脉注射新鲜肝素化供体特异性血液（DST）可显著延长完全同种异体ACI（RT1^a）至LEW（RT1^l）大鼠肝移植物的存活时间。此外，用PVG.r1血液预处理LEW大鼠，其仅共享RT 1。主要组织相容性复合物（MHC）区域与ACI，显着延长ACI肝移植物的存活。我们报道了移植后肝移植物白细胞浸润的细胞特性，流式细胞仪分析显示，浸润肝移植物的CD 8 ^+ T细胞可分为两个亚群，CD 45 RC ^-CD 8 ^+和CD 45 RC ^+ CD 8 ^+ T细胞，与未处理的同种异体移植物相比，经DST预处理的受体的肝脏同种异体移植物中CD 4 SRC ^-CD 8 ^+ T细胞/CD 45 RC ^+ CD 8 ^+ T细胞的比例显着较高。逆转录聚合酶链反应（RT-PCR）分析显示，收获的CD 4 SRC ^+ CD 8 ^+ T细胞 关于我们 来自未经处理的肝移植物的艾德表达白细胞介素（IL）-2和干扰素（IFN）-γ。相反，DST预处理的肝移植物中的CD 45 RC ^-CD 8 ^+ T细胞表达IL-4和IL-10，但不表达IL-2。结果表明，DST预处理后，CD 45 RC白细胞共同抗原可分化为CD 8 ^+ T细胞，CD 4SRC ^-CD 8 ^+ T细胞持续浸润，分泌Th 2型细胞因子，可能通过引起免疫无反应性来预防移植排斥反应。此外，与未处理的同种异体移植物相比，在用PVO.r1血液预处理的受体的肝同种异体移植物中，CD 45 RC ^-CD 8 ^+ T细胞/CD 45 RC ^+ CD 8 ^+ T细胞的比率显著更高。未处理的肝移植物中的TGF-β和IL-18 mRNA显著高于DST预处理的受体的同种异体移植物中观察到的。10 mRNA水平在输血动物移植物中显着高于那些在未处理的同种异体移植物组。IL-10和TGF-β抑制同种异体混合淋巴细胞反应中的IL-12和IL-18 mRNA转录。TGF-β可显著抑制CD 4 SRC的表达，但对IL-10无明显抑制作用。因此，TGF-β诱导的CD 45 RC ^-CD 8 ^+T细胞表达IL-4和IL-10 mRNA可能在移植前供体抗原诱导的免疫无反应中起重要作用。少

A single intravenous injection of freshly heparinized donor-specific blood (DST) prior to transplantation significantly prolonged the survival of fully allogeneic ACI(RT1^a)-to-LEW(RT1^l) rat hepatic allografts. Additionally, pretreatment of LEW rats with PVG.r1 blood, which shares only the RT1. A major histocompatibility complex (MHC) region with ACI, significantly prolonged the survival of ACI hepatic allografts. We report the cellular identity of hepatic allograft leukocyte infiltrates following transplantation.Fluorescence-activated cell sorting (FACS) analysis revealed that CD8^+ T cells infiltrating liver allografts could be divided into two subsets, CD45RC^-CD8^+ and CD45RC^+CD8^+ T cells, and that the ratio of CD4SRC^-CD8^+ T cells/ CD45RC^+CD8^+ T cells was significantly higher in hepatic allografta of recipients pretreated with DST as compared to untreated allografts. Reverse transcriptase polymerase chain reaction (RT-PCR) analysis revealed that CD4SRC^+CD8^+ T cells harvest … More ed from untreated hepatic allografts expressed interleukin (IL)-2 and interferon (IFN)-gamma. In contrast, CD45RC^-CD8^+ T cells from hepatic allografts pretreated with DST expressed IL-4 and IL-1O, but not IL-2. These results indicated that the CD45RC leukocyte common antigen could be used to differentiate CD8^+ T cells following pretreatment with DST.Persistent infiltration of CD4SRC^-CD8^+ T cells, capable of secreting Th2-type cytokines may prevent allograft rejection by causing immunologic unresponsiveness. I addition, the ratio of CD45RC^-CD8^+ T cells/CD45RC^+CD8^+ T cells was significantly higher in hepatic allografts of recipients pretreated with PVO.rl blood compared to untreated allografts.The levels of IEN-gamma, IL-12, and IL-18 mRNA in untreated hepatic allografts were significantly higher than those observed in allografts from recipients pretreated with DST.Transforming growth factor (TGF)-beta and IL-1O mRNA levels in grafts of transfused animals were significantly greater than those in the untreated allograft group. IL-12 and IL-18 mRNA transcripts in an allogeneic mixed lymphocyte reaction were inhibited by IL-10 and TGF-beta. CD4SRC expression was significantly inhibited by TGF-beta, but not IL-1O.Thus CD45RC^-CD8^+T cells expressed IL-4 and IL-1O mRNA and induced by TGF-beta may play an important role in immunologic unresponsiveness induced by donor antigens prior to transplantation. Less