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Cross-Reactive Donor-Specific CD8+ Tregs Efficiently Prevent Transplant Rejection.
Cell Reports ( IF 7.5 ) Pub Date : 2019-12-24 , DOI: 10.1016/j.celrep.2019.11.106
Elodie Picarda 1 , Séverine Bézie 1 , Lorena Usero 1 , Jason Ossart 1 , Marine Besnard 1 , Hanim Halim 2 , Klara Echasserieau 3 , Claire Usal 1 , Jamie Rossjohn 4 , Karine Bernardeau 3 , Stéphanie Gras 5 , Carole Guillonneau 1
Affiliation  

To reduce the use of non-specific immunosuppressive drugs detrimental to transplant patient health, therapies in development aim to achieve antigen-specific tolerance by promoting antigen-specific regulatory T cells (Tregs). However, identification of the natural antigens recognized by Tregs and the contribution of their dominance in transplantation has been challenging. We identify epitopes derived from distinct major histocompatibility complex (MHC) class II molecules, sharing a 7-amino acid consensus sequence positioned in a central mobile section in complex with MHC class I, recognized by cross-reactive CD8+ Tregs, enriched in the graft. Antigen-specific CD8+ Tregs can be induced in vivo with a 16-amino acid-long peptide to trigger transplant tolerance. Peptides derived from human HLA class II molecules, harboring the rat consensus sequence, also activate and expand human CD8+ Tregs, suggesting its potential in human transplantation. Altogether, this work should facilitate the development of therapies with peptide epitopes for transplantation and improve our understanding of CD8+ Treg recognition.

中文翻译:

交叉反应的供体特异性CD8 + Treg可有效防止移植排斥。

为了减少有害于移植患者健康的非特异性免疫抑制药物的使用,正在开发的疗法旨在通过促进抗原特异性调节性T细胞(Tregs)来达到抗原特异性耐受性。然而,鉴定由Tregs识别的天然抗原及其在移植中的优势作用一直是挑战性的。我们确定了从不同的主要组织相容性复合物(MHC)类II分子,共享共享一个位于中央移动部分与MHC I类复合物的7个氨基酸共有序列的抗原决定簇,该序列被交叉反应的CD8 + Tregs识别,并在移植物中富集。可以用16个氨基酸长的肽在体内诱导抗原特异性CD8 + Treg,从而触发移植耐受性。源自人类HLA II类分子的肽,具有大鼠共有序列,还可激活和扩增人类CD8 + Treg,表明其在人类移植中的潜力。总而言之,这项工作应有助于开发肽表位用于移植的疗法,并增进我们对CD8 + Treg识别的理解。
更新日期:2019-12-25
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