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在小鼠中ABO-A抗体诱导是T细胞依赖的,雌激素独立的,并由CD22调节

Ibrahim Adam¹, Bruce Motyka¹, Jean Pearcey¹

¹Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada; Alberta Transplant Institute and Canadian Donation and Transplantation Research Program, Edmonton, Canada.

American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons

|March 8, 2025

概括

在移植过程中至关重要的ABO抗体,人们对其了解甚少. 这项研究揭示了B1a细胞产生天然和诱导的抗A抗体,具有明显的T细胞和雌激素依赖性,为免疫反应提供了洞察力.

科学领域:

免疫学免疫学免疫学
移植免疫学移植免疫学

背景情况:

在器官和血液移植中,ABO抗体带来了重大挑战.
对抗ABO抗原的自然抗体 (nAbs) 和诱导抗体 (iAbs) 生产的精确机制尚未完全阐明.

研究的目的:

在不同的小鼠模型中研究抗A天然抗体 (nAbs) 和诱导抗体 (iAbs) 的产生.
确定B细胞 (CD19,CD22),T细胞 (CD4) 和雌激素在抗A抗体生成中的作用.

主要方法:

使用了野生型 (WT),CD19淘汰 (CD19KO) 和CD22淘汰 (CD22KO) 的小鼠.
使用ABO-A血液细胞膜 (BCM) 来刺激抗体的产生来自同源或同源A转基因小鼠和异源人类 (Hu-A) BCM.
采用了CD4-T细胞枯竭和复合策略,以及雌激素受体α缺乏的小鼠.

主要成果:

CD19KO小鼠缺乏抗A nAbs和iAbs,表明B细胞依赖.
WT小鼠需要异性或异性BCM进行抗-A iAb刺激,突出需要外来抗原和T细胞参与.
在某些条件下,CD22KO小鼠的抗体反应发生变化,抗A nAbs和T细胞独立的iAb刺激增加.
反-A nAbs是依赖雌激素的,而iAbs是独立于雌激素的.

结论:

抗A nAbs和iAbs都由B1a细胞产生.
在WT小鼠中,抗A iAb诱导是T细胞依赖的,需要暴露于具有外来蛋白的非自身A抗原.
缺少CD22消除了T细胞独立的抑制,允许在没有外来蛋白质的情况下进行iAb刺激.
抗A nAbs是依赖雌激素的,而iAbs是独立于雌激素的.

关键词:

在小鼠中的ABO抗体.不兼容 ABO 的移植.在CD2222中,我们可以看到CD22.依赖T细胞的抗体与依赖T细胞的抗体.在小鼠中的天然抗体.

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