Lack of IL-21 signal attenuates graft-versus-leukemia effect in the absence of CD8 T-cells.

Lack of IL-21 signal attenuates graft-versus-leukemia effect in the absence of CD8 T-cells.
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DOI:
10.1038/bmt.2010.342
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发表时间:
2011-12
影响因子:
4.8
通讯作者:
Ozawa K
Ozawa K
中科院分区:
医学3区
文献类型:
--
作者:
Meguro A;Ozaki K;Hatanaka K;Oh I;Sudo K;Ohmori T;Matsu H;Tatara R;Sato K;Sakata Y;Nakae S;Leonard WJ;Ozawa K

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以前,我们已经表明,IL-21 R-/-脾细胞改善移植物抗宿主病(GVHD)相比,野生型脾细胞。在这里,我们研究了IL-21 R-/-脾细胞是否减少移植物抗白血病(GVL)效应。令人惊讶的是,IL-21 R-/-脾细胞有效地消除白血病细胞以及野生型脾细胞,表明在不存在IL-21信号传导的情况下保留GVL效应。为了比较IL-21 R-/-和野生型细胞之间的GVL效应,我们滴定了消除白血病细胞所需的脾细胞数量,发现两种类型的脾细胞的GVL效应阈值均在5 × 105和5 × 106之间。与野生型细胞相比,与CD 8耗尽的脾细胞而不是与纯化的CD 8 T细胞共移植导致IL-21 R-/-细胞的抗白血病作用显著降低,表明IL-21信号传导的缺乏主要损害CD 4 T细胞而不是CD 8 T细胞功能,并且与IL-21 R-/-大量脾细胞相当的GVL作用是由CD 8 T细胞的协同补偿引起的。
Previously, we have shown that IL-21R-/- splenocytes ameliorate graft-versus-host disease (GVHD) as compared to wild type splenocytes. Here, we investigated whether or not IL-21R-/- splenocytes diminish the graft-versus-leukemia (GVL) effect. Surprisingly, IL-21R-/- splenocytes efficiently eliminate leukemic cells as well as wild type splenocytes, suggesting the retention of GVL effects in the absence of IL-21 signaling. To compare the GVL effect between IL-21R-/- and wild type cells, we titrated the number of splenocytes required for the elimination of leukemic cells and found that the threshold of GVL effect was obtained between 5 × 105 and 5 × 106 with both types of splenocytes. Co-transplantation with CD8-depleted splenocytes but not with purified CD8 T-cells resulted in a significant reduction in anti-leukemic effect of IL-21R-/- cells compared to wild type cells, suggesting that the lack of IL-21 signaling primarily impairs CD4 T-cell rather than CD8 T-cell function and the comparable GVL effect with IL-21R-/- bulk splenocytes results from cooperative compensation by CD8 T-cells.
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