异基因非清髓造血干细胞移植后WT1特异性T细胞亚群与移植物抗宿主病的关系

目的 探讨非清髓造血干细胞移植后WT1诱发的各T细胞亚群与移植物抗宿主病(GVHD)之间的关系.方法 分析19例表达WT1的白血病患者在全相合非清髓造血干细胞移植后GVHD的发生情况;WT1126-134体外刺激患者外周血单个核细胞,采用胞内因子染色法(ICCS)检测移植前后外周血中Tc1、Tc2、Th1及Th2细胞;对供受者表达HLA-A*0201的14例患者采用HLA-A*0201/WT1五聚体检测外周血中的WT1+CD8+细胞毒性T淋巴细胞(CTL).结果 ①19例患者中,17例并发GVHD,其中16例在GVHD发生时出现以Tc1及Th1细胞为主的高峰(P=0.039).②Ⅱ度以上急性GVHD(aGVHD)患者在GVHD发生时Tc1及Th1细胞峰值水平均高于Ⅰ度aGVHD者,但差异无统计学意义(P=0.900及P=0.140).③弥漫型慢性GVHD(cGVHD)患者Tc1及Th1细胞峰值水平明显高于局限型cGVHD者,但仅Th1细胞峰值水平差异具有统计学意义(P=0.004),而Tc1细胞峰值水平差异无统计学意义(P=0.060).④未并发GVHD者Tc1、Th1及WT1+CD8+CTL峰值水平接近于轻度aGVHD患者的平均水平,但低于中重度aGVHD患者的平均水平.结论 GVHD发生时WT1诱发的移植物抗白血病(GVL)效应增强,其强度与GVHD尤其是cGVHD发生的严重程度相关;相对于局限型cGVHD患者,弥漫型cGVHD患者WT1诱发GVL效应的增强可能与Th1细胞有关.

Abstract：

Objective To explore the relationship between WT1-induced T-cell subsets and graftversus-host disease(GVHD) after nonmyeloablative allogeneic hematopoietic stem cell transplantation(NST).Methods Peripheral blood mononucleated cells(PBMCs) from 19 patients who expressed WT1 and developed GVHD after NST were simulated by WT1126 - 134 peptide in vitro, and proportions of WT1-induced-T-cell subsets (Tc1 ,Tc2 ,Th1 ,Th2 cells) before and after transplant were detected by intracellular cytokine staining (ICCS) assay. WT1 -specific CD8 + CTLs of 14 patients with HLA-A * 0201 were detected by HLA-A *0201/WT1 pentamer. Results ①)17 of 19 patients developed GVHD, among whom proportions of Tc1 and Th1 cells, achieved peak value in 16 patients at occurrence of GVHD( P =0. 039) ;②The peak proportions of Tc1 and Th1 cells in patients with aGVHD above grade Ⅱ were higher than those with grade Ⅰ , but being no statistical difference ( P = 0. 900 and P = 0. 140, respectively ); ③The peak proportion of Th1 cells ( P =0.004), but not Tc1 cells( P =0.060)in patients with extensive cGVHD was significantly higher than that in patients with limited one;④)Proportions of Tc1, Th1 and WT1 + CD8+ CTL in patients without GVHD were similar to those in patients with Grade Ⅰ aGVHD, but lower than those in aGVHD above grade Ⅱ. Conclusion GVHD promotes the generation of WT1-induced GVL effect, and the intensity of the latter maybe correlated with the intensity of GVHD, especially cGVHD. Th1 cells play a more important role in the enhancement of WT1-induced GVL effect in extensive cGVHD patient than in limited cGVHD patients.

Relationship between WT1-specific T-cell subsets and graft-versus-host disease after nonmyeloablative allogeneic transplantation

Objective To explore the relationship between WT1-induced T-cell subsets and graftversus-host disease(GVHD) after nonmyeloablative allogeneic hematopoietic stem cell transplantation(NST).Methods Peripheral blood mononucleated cells(PBMCs) from 19 patients who expressed WT1 and developed GVHD after NST were simulated by WT1126 - 134 peptide in vitro, and proportions of WT1-induced-T-cell subsets (Tc1 ,Tc2 ,Th1 ,Th2 cells) before and after transplant were detected by intracellular cytokine staining (ICCS) assay. WT1 -specific CD8 + CTLs of 14 patients with HLA-A * 0201 were detected by HLA-A *0201/WT1 pentamer. Results ①)17 of 19 patients developed GVHD, among whom proportions of Tc1 and Th1 cells, achieved peak value in 16 patients at occurrence of GVHD( P =0. 039) ;②The peak proportions of Tc1 and Th1 cells in patients with aGVHD above grade Ⅱ were higher than those with grade Ⅰ , but being no statistical difference ( P = 0. 900 and P = 0. 140, respectively ); ③The peak proportion of Th1 cells ( P =0.004), but not Tc1 cells( P =0.060)in patients with extensive cGVHD was significantly higher than that in patients with limited one;④)Proportions of Tc1, Th1 and WT1 + CD8+ CTL in patients without GVHD were similar to those in patients with Grade Ⅰ aGVHD, but lower than those in aGVHD above grade Ⅱ. Conclusion GVHD promotes the generation of WT1-induced GVL effect, and the intensity of the latter maybe correlated with the intensity of GVHD, especially cGVHD. Th1 cells play a more important role in the enhancement of WT1-induced GVL effect in extensive cGVHD patient than in limited cGVHD patients.