Aged B cells alter immune regulation of allografts in mice.

Aged B cells alter immune regulation of allografts in mice.
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衰老的 B 细胞会改变小鼠同种异体移植物的免疫调节。

DOI:
10.1002/eji.201646353
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发表时间:
2016
影响因子:
5.4
通讯作者:
Goldstein,DanielR
Goldstein,DanielR
中科院分区:
医学3区
文献类型:
--
作者:
Mori,DanielN;Shen,Hua;Galan,Anjela;Goldstein,DanielR

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老年人的器官移植正在增加,但衰老如何影响 B 细胞对器官移植的反应仍不清楚。在这里,我们表明,抗 CD20 抗体对 B 细胞的消耗根据受体年龄的不同会产生不同的影响。在年轻的小鼠接受者中,抗 CD20 治疗损害了免疫调节延长皮肤同种异体移植存活的能力。相比之下,抗CD20治疗延长了接受免疫调节治疗的老年受者的同种异体移植物的存活率。尽管不同年龄组之间的调节性 B 细胞功能以及边缘和滤泡 B 细胞的数量相似,但称为年龄相关 B 细胞 (ABC) 的 B 细胞亚群会随着衰老而积累。与年轻小鼠的 ABC 相比,从老年小鼠分离的 ABC 表现出 CD73、CD80、CD106 和 TLR2 的上调,并且增强 T 细胞同种免疫的能力增强。重要的是,来自老年小鼠而非年轻小鼠的 ABC 会损害免疫调节能力,从而在过继转移至年轻移植受体后提高同种异体移植物的存活率。我们的研究表明 ABC 会损害同种异体移植物的免疫调节。因此,在提出 B 细胞消耗免疫疗法时需要考虑接受者的年龄。
Organ transplantation in older people is increasing, but how aging impacts B‐cell responses to organ transplantation is still unknown. Here, we show that the depletion of B cells with anti‐CD20 antibodies has disparate effects depending on recipient age. In young murine recipients, anti‐CD20 treatment impaired the ability of immune modulation to extend skin allograft survival. In contrast, anti‐CD20 treatment extended allograft survival in aged recipients treated with immune modulation. Although regulatory B‐cell function and the numbers of marginal and follicular B cells were similar between age groups, a subpopulation of B cells, termed age‐associated B cells (ABCs), accumulated upon aging. ABCs isolated from aged mice exhibited upregulation of CD73, CD80, CD106, and TLR2 and an increased capacity to augment T‐cell alloimmunity compared to ABCs from young mice. Importantly, ABCs from aged, but not young, mice impaired the ability of immune modulation to enhance allograft survival after adoptive transfer into young transplant recipients. Our study indicates that ABCs impair the immune regulation of allografts. Thus, recipient age needs to be considered when proposing B‐cell‐depleting immune therapy.
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