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2017 ; 7
(1
): 11518
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Extracellular vesicles derived from T regulatory cells suppress T cell
proliferation and prolong allograft survival
#MMPMID28912528
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
Sci Rep
2017[Sep]; 7
(1
): 11518
PMID28912528
show ga
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.