Extracellular vesicles derived from T regulatory cells suppress T cell proliferation and prolong allograft survival.

Extracellular vesicles derived from T regulatory cells suppress T cell proliferation and prolong allograft survival.
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DOI:
10.1038/s41598-017-08617-3
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发表时间:
2017-09-14
期刊:
影响因子:
4.6
通讯作者:
Benigni A
Benigni A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Aiello S;Rocchetta F;Longaretti L;Faravelli S;Todeschini M;Cassis L;Pezzuto F;Tomasoni S;Azzollini N;Mister M;Mele C;Conti S;Breno M;Remuzzi G;Noris M;Benigni A

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We have previously shown that rat allogeneic DC, made immature by adenoviral gene transfer of the dominant negative form of IKK2, gave rise in-vitro to a unique population of CD4+CD25− regulatory T cells (dnIKK2-Treg). These cells inhibited Tcell response in-vitro, without needing cell-to-cell contact, and induced kidney allograft survival prolongation in-vivo. Deep insight into the mechanisms behind dnIKK2-Treg-induced suppression of Tcell proliferation remained elusive. Here we document that dnIKK2-Treg release extracellular vesicles (EV) riched in exosomes, fully accounting for the cell-contact independent immunosuppressive activity of parent cells. DnIKK2-Treg-EV contain a unique molecular cargo of specific miRNAs and iNOS, which, once delivered into target cells, blocked cell cycle progression and induced apoptosis. DnIKK2-Treg-EV-exposed T cells were in turn converted into regulatory cells. Notably, when administered in-vivo, dnIKK2-Treg-EV prolonged kidney allograft survival. DnIKK2-Treg-derived EV could be a tool for manipulating the immune system and for discovering novel potential immunosuppressive molecules in the context of allotransplantation.
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