单倍体相合骨髓移植小鼠GVHD靶器官的器官特异性T细胞受体克隆谱型的分子特征

本课题通过单倍体相合骨髓移植小鼠模型，研究GVHD靶器官的器官特异性T细胞受体谱型特点，以及GVHD靶器官克隆性T细胞的TCRBV CDR3分子特征。建立单倍体相合异基因移植小鼠GVHD模型，应用RT—PCR扩增小鼠肝脏、皮肤、回肠等组织移植前后TCRBV20个家族的基因序列，通过基因扫描判断TCRBV家族的克隆表达、CDR3克隆性质。对于寡克隆表达的TCRBV家族在长泳道测序胶上电泳，对部分单克隆条带测序，得到一组肝脏、皮肤、回肠在移植后不同时间与GVHD相关的TCRBV CDR3的分子。结果表明：单倍体相合骨髓移植小鼠在移植后14天临床开始出现典型的GVHD表现。移植后受鼠肝脏、皮肤、远端回肠等均出现典型的GVHD病理表现，在其T细胞受体谱型图上出现了分属TCRBV家族的单克隆或寡克隆增生的T细胞。肝脏、皮肤、回肠等GVHD的靶器官中部分克隆性增生的T细胞TCRBV CDR3分子存在一些C’末端保守的CDR3氨基酸基序（motif）。结论：单倍体相合异基因移植后发生GVHD的组织可出现T细胞单克隆及寡克隆增生，GVHD相关T细胞克隆共用一些保守的TCRBV CDR3基序，识别类似的抗原。

Organ-specific T Cell Receptor Repertoire in Target Organs of Murine Graft-versus-Host Disease after Haploidentical Bone Marrow Transplantation

This study was purpused to analyze the characteristics of T cell receptor repertoire in target organs of murine graft-versus-host after haploidentical bone marrow transplantation （hiBMT） and the molecular characteristics of complementarity determining region3 （ CDR3 ） repertoires of monoclonal T cell in liver, skin and ileum in murine after hiBMT. Murine haploidentical BMT model was established, CDR3-size spectratyping was used to study TCRBV repertoires in recipent liver, skin, ileum, spleen and a group of CDR3 molecules was obtained from GVHD-target tissues. The results showed that GVHD occurred as early as days 14 after transplantation and was proven by histology in liver, skin and ileum. A number of new monoclonal and oligoclonal T cells emerged in GVHD-target tissue. 45 CDR3 molecules had six C＇-terminal motifs, which obtained from liver, skin, ileum in different times after hiBMT. It is concluded that target organs of murine graft-versus-host disease after hiBMT emerged a number of clonal or oilgoclonal T cells, part of this T cell clones commonly uses some conserved CDR3 motifs and may recognize similar antigen.