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2016 ; 6
(ä): 32971
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Combining Exosomes Derived from Immature DCs with Donor Antigen-Specific Treg
Cells Induces Tolerance in a Rat Liver Allograft Model
#MMPMID27640806
Ma B
; Yang JY
; Song WJ
; Ding R
; Zhang ZC
; Ji HC
; Zhang X
; Wang JL
; Yang XS
; Tao KS
; Dou KF
; Li X
Sci Rep
2016[Sep]; 6
(ä): 32971
PMID27640806
show ga
Allograft tolerance is the ultimate goal in the field of transplantation
immunology. Immature dendritic cells (imDCs) play an important role in
establishing tolerance but have limitations, including potential for maturation,
short lifespan in vivo and short storage times in vitro. However, exosomes
(generally 30-100?nm) from imDCs (imDex) retain many source cell properties and
may overcome these limitations. In previous reports, imDex prolonged the survival
time of heart or intestine allografts. However, tolerance or long-term survival
was not achieved unless immune suppressants were used. Regulatory T cells (Tregs)
can protect allografts from immune rejection, and our previous study showed that
the effects of imDex were significantly associated with Tregs. Therefore, we
incorporated Tregs into the treatment protocol to further reduce or avoid
suppressant use. We defined the optimal exosome dose as approximately 20??g (per
treatment before, during and after transplantation) in rat liver transplantation
and the antigen-specific role of Tregs in protecting liver allografts. In the
co-treatment group, recipients achieved long-term survival, and tolerance was
induced. Moreover, imDex amplified Tregs, which required recipient DCs and were
enhanced by IL-2. Fortunately, the expanded Tregs retained their regulatory
ability and donor-specificity. Thus, imDex and donor-specific Tregs can
collaboratively induce graft tolerance.