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准细胞表面VISTA表达在全特异的原始T细胞上促进了耐受性
Brent H Koehn1, Elizabeth C Nowak2, Sladjana Skopelja-Gardner2
1Division of Blood and Marrow Transplantation, Department of Pediatrics, University of Minnesota Cancer Center, Minneapolis, MN.
Blood
|February 7, 2025
概括
用单克隆抗体向VISTA可以在异种干细胞移植后预防致命的移植对宿主疾病 (GVHD). 这种方法消耗了全活性T细胞,同时保持了移植与淋巴瘤效应,提供了一个有前途的治疗策略.
科学领域:
- 免疫学 免疫学 免疫学
- 移植生物学 移植生物学
- 在瘤学瘤学.
背景情况:
- 同源性造血干细胞移植 (allo-HSCT) 受到移植对宿主疾病 (GVHD) 的限制.
- T细胞激活驱动GVHD,像VISTA (V域免疫球蛋白含有T细胞激活抑制剂) 这样的共抑制分子可以抑制T细胞活性.
- 在alo-HSCT受体中,VISTA表达增加了供体T细胞,使它们易受抗VISTA抗体介导的衰竭.
研究的目的:
- 研究抗VISTA单克隆抗体 (mAb) 在预防致命的急性GVHD.的疗效.
- 确定抗VISTA mAb介导的T细胞枯竭的机制及其对移植与淋巴瘤 (GVL) 效应的影响.
- 探索使用抗VISTA mAb在allo-HSCT中的潜在临床转化途径.
主要方法:
- 使用多种动物模型的allo-HSCT和GVHD.
- 用单剂量抗VISTA mAb来评估GVHD致死率和T细胞枯竭.
- 研究了不同细胞类型和Fc受体介导的细胞在T细胞清除中的作用.
- 在淋巴瘤挑战模型中评估了GVL效应,并在异源GVHD模型中评估了结果.
主要成果:
- 在多个模型中,单剂量抗VISTA mAb预防了急性GVHD致死率.
- 需要针对非T细胞类型的抗VISTA mAb介导的全活性T细胞的删除,并通过Fc受体介导的化细胞发生.
- 当抗VISTA mAb向捐赠者T细胞时,即使在未分离的情况下,移植对淋巴瘤效应也在很大程度上保留了.
- 在异种GVHD模型中,Anti-VISTA mAb降低了供体T细胞扩张和受体死亡率.
结论:
- 抗VISTA mAb是一种有前途的策略,可以缓解合后的急性GVHD死亡率.
- 这种方法可以保持移植对淋巴瘤效应,这对于消除残留癌细胞至关重要.
- 向VISTA提供了一种新的临床途径,通过控制GVHD而改善alo-HSCT的结果,而不会影响抗瘤免疫力.
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