在心脏异构移植拒绝期间异构移植和接受者组织损伤:来自无细胞DNA的证据
Temesgen E Andargie1, Naoko Tsuji2, Naoki Hayase2
1Genomic Research Alliance for Transplantation (GRAfT) and Laboratory of Applied Precision Omics, National Heart, Lung, and Blood Institute (NHLBI), NIH, Bethesda, MD; Critical Care Medicine and Pulmonary Branch, NHLBI, Bethesda, MD.
概括
心脏杂种移植排斥 (AR) 涉及受体组织损伤,由增加的无细胞DNA (cfDNA) 表示. 这种来自各种受体细胞的cfDNA信号器官功能障碍和损伤相关的高分子模式活动.
科学领域:
- 移植免疫学 移植免疫学
- 发现生物标志物的发现.
- 分子诊断学 分子诊断学
背景情况:
- 心脏异位移植排斥 (AR) 传统上被视为一种异位移植特异性疾病.
- 新出现的证据表明,在AR过程中发生受体组织损伤,这与移植存活率差的因素有关.
- 在AR中,确切的机制和受体组织损伤的程度尚不清楚.
研究的目的:
- 调查心脏杂种移植排斥与受体组织损伤相关的假设.
- 量化全移植细胞和受体细胞自由DNA (cfDNA) 水平,并确定AR中的cfDNA组织起源.
- 通过评估cfDNA损伤相关分子模式 (DAMP) 活动,探索AR和受体组织损伤之间的机制联系.
主要方法:
- 对遗传和表观遗传特征的分析,以区分和量化所有移植和受体cfDNA.
- 在AR患者和稳定的移植对照中测量血cfDNA水平.
- 用细胞培养模型对AR中的cfDNA DAMP活性与稳定对照样本进行比较.
主要成果:
- 与稳定的对照组相比,AR患者的异体移植和接受者cfDNA水平显著升高.
- 在AR中增加的受体cfDNA主要来自免疫细胞,血管内皮,肝细胞和上皮细胞.
- 受体cfDNA水平与已确定的器官功能障碍生物标志物相关,AR衍生cfDNA显示DAMP活性升高.
结论:
- 心脏异体移植的排斥与受体组织的重大损伤有关,其证据是cfDNA升高.
- 受体cfDNA的增加及其在AR中的DAMP活性有助于受体器官功能障碍.
- 需要进一步的研究来利用这些发现来改善AR管理和患者的治疗结果.
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