Elimination of donor CD47 protects against vascularized allograft rejection in mice.

Elimination of donor CD47 protects against vascularized allograft rejection in mice.
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消除供体 CD47 可防止小鼠血管化同种异体移植排斥

DOI:
10.1111/xen.12459
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发表时间:
2019-03
影响因子:
3.9
通讯作者:
Yang YG
Yang YG
中科院分区:
医学3区
文献类型:
--
作者:
Chen M;Wang Y;Wang H;Sun L;Fu Y;Yang YG

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CD 47是一种广泛表达的跨膜糖蛋白,在调节细胞存活和功能中起着复杂的作用。我们以前已经表明,种间不相容性的CD 47起着重要的作用,在触发排斥反应的细胞异种移植物的巨噬细胞。然而,CD 47在实体器官移植中的作用仍不确定。在这里,我们探讨了这个问题,在小鼠心脏移植模型。我们观察到,供体心脏中缺乏CD 47对同基因或单一MHC I类错配受体的移植物存活没有有害影响,其中野生型(WT)和CD 47敲除(CD 47 KO)小鼠心脏均长期存活,无排斥反应迹象。巧合的是,供体CD 47的消除有利于信号MHC II类和I类+II类错配组合中的移植物存活,其中CD 47 KO供体心脏与WT供体心脏相比显示出显著改善的存活。同样,在α 1,3-半乳糖基转移酶缺陷小鼠中,CD 47 KO供体心脏比WT心脏对体液排斥反应的抵抗力更强。此外,在接受抗CD 47配体血小板反应蛋白-1(TSP 1)抗体或TSP 1缺陷的受体小鼠中观察到WT同种异体移植物的显著延长,表明TSP 1-CD 47信号传导可能刺激血管化同种异体移植物排斥反应。因此,与细胞移植不同,供体CD 47表达可能加速血管化同种异体移植物的排斥反应。
CD47 is a ubiquitously expressed transmembrane glycoprotein that plays a complex role in regulation of cell survival and function. We have previously shown that the interspecies incompatibility of CD47 plays an important role in triggering rejection of cellular xenografts by macrophages. However, the role of CD47 in solid organ transplantation remains undetermined. Here, we explored this question in mouse models of heart allotransplantation. We observed that the lack of CD47 in donor hearts had no deleterious effect on graft survival in syngeneic or single MHC class I‐mismatched recipients, in which both wild‐type (WT) and CD47 knockout (CD47 KO) mouse hearts survived long term with no sign of rejection. Paradoxically, elimination of donor CD47 was beneficial for graft survival in signal MHC class II‐ and class I‐ plus class II‐mismatched combinations, in which CD47 KO donor hearts showed significantly improved survival compared to WT donor hearts. Similarly, CD47 KO donor hearts were more resistant than WT hearts to humoral rejection in α1,3‐galactosyltransferase‐deficient mice. Moreover, a significant prolongation of WT allografts was observed in recipient mice treated with antibodies against a CD47 ligand thrombospondin‐1 (TSP1) or with TSP1 deficiency, indicating that TSP1‐CD47 signaling may stimulate vascularized allograft rejection. Thus, unlike cellular transplantation, donor CD47 expression may accelerate the rejection of vascularized allografts.
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