Early recovery of CD4 T cell receptor diversity after "lymphoablative" conditioning and autologous CD34 cell transplantation.

Early recovery of CD4 T cell receptor diversity after "lymphoablative" conditioning and autologous CD34 cell transplantation.
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“淋巴清除”调理和自体 CD34 细胞移植后 CD4 T 细胞受体多样性的早期恢复。

DOI:
10.1016/j.bbmt.2008.09.013
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发表时间:
2008
期刊:
Biology of blood and marrow transplantation : journal of the American Society for Blood and Marrow Transplantation
影响因子:
--
通讯作者:
Maloney,DavidG
Maloney,DavidG
中科院分区:
--
文献类型:
--
作者:
Storek,Jan;Zhao,Zhao;Liu,Yiping;Nash,Richard;McSweeney,Peter;Maloney,DavidG

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基于T细胞受体β链免疫表型或谱分析,认为移植后T细胞多样性受到严重限制。我们使用β链测序,研究了2例成年患者的CD4 T细胞多样性,这些患者接受了环磷酰胺(Cy)、全身照射(TBI)和抗胸腺细胞球蛋白(ATG)的“淋巴清除性”预处理以及通过富集CD34细胞去除T细胞的造血细胞自体移植。移植的适应症是系统性硬化症(SSc)或多发性硬化症(MS)。移植前,2例患者中不同β链的估计数量(CD4 T细胞克隆的最小数量)为600,000至700,000,与健康对照组的数量相似。移植后1个月,这一数字为200,000至500,000,移植后12个月,这一数字为400,000至1,600,000。总之,淋巴清除性条件和自体CD34细胞移植后早期的T细胞数量可能比以前认识到的更多样化,可能是因为许多T细胞克隆在条件下存活或与移植物一起回输。因此,该疗法可能不是完全T细胞淋巴清除性的。
T cell diversity posttransplantation is thought to be severely restricted, based on T cell receptor β-chain immunophenotyping or spectratyping. Using β-chain sequencing, we studied CD4 T cell diversity in 2 adult patients undergoing “lymphoablative” conditioning with cyclophosphamide (Cy), total body irradiation (TBI), and antithymocyte globulin (ATG) and autologous transplantation of hematopoietic cells depleted of T cells by enrichment for CD34 cells. The indication for the transplantation was systemic sclerosis (SSc) or multiple sclerosis (MS). Pretransplantation, the estimated number of distinct β chains (the minimum number of CD4 T cell clones) in the 2 patients was 600,000 to 700,000, similar to the number in a healthy control. This number was 200,000 to 500,000 at 1 month posttransplantation and 400,000 to 1,600,000 at 12 months posttransplantation. In conclusion, the number of T cells early after lymphoablative conditioning and autologous CD34 cell transplantation may be more diverse than previously appreciated, possibly because many T cell clones survive the conditioning or are reinfused with the graft. Thus, the therapy may not be completely T cell lymphoablative.
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