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2017 ; 7
(1
): 1322
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Low proportion of follicular regulatory T cell in renal transplant patients with
chronic antibody-mediated rejection
#MMPMID28465534
Chen W
; Bai J
; Huang H
; Bi L
; Kong X
; Gao Y
; Han Y
; Xiao L
; Shi B
Sci Rep
2017[May]; 7
(1
): 1322
PMID28465534
show ga
Follicular regulatory T (Tfr) cell can effectively regulate humoral immunity, but
its function and mechanism in antibody-mediated rejection (AMR) after organ
transplantation remains unclear. Here we detected follicular helper T (Tfh) cell
subsets in 88 renal transplant patients with chronic renal allograft dysfunction
(40 with AMR and 48 without AMR). The ratio of Tfr cells in renal graft tissues
and peripheral blood of AMR patients significantly decreased, while the ratio of
IL-21-producing Tfh cells (Tfh2 and Tfh17) significantly increased, compared to
non-AMR patients. When tested in functional assays, Tfr cells from both AMR and
non-AMR patients exerted equivalent inhibitory function. Tfr cell transplantation
or CTLA-4 virus transfection could significantly inhibit IL-21 secretion from Tfh
cells of these patients, further suppress the proliferation and differentiation
of B cells. CTLA-4 blocking, IL-10 and TGF-? neutralization could partially
weaken such inhibitory effect of Tfr cells. Besides, our study found that
sirolimus reduced the ratio of Tfr cells, while cyclosporine and tacrolimus had
no significant effect on Tfr cells. In a word, renal transplant patients with AMR
have low proportion of Tfr cells but these cell exerted normal function.