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2015 ; 99
(9
): 1817-28
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Interleukin-10 From Marginal Zone Precursor B-Cell Subset Is Required for
Costimulatory Blockade-Induced Transplantation Tolerance
#MMPMID25839706
Lal G
; Nakayama Y
; Sethi A
; Singh AK
; Burrell BE
; Kulkarni N
; Brinkman CC
; Iwami D
; Zhang T
; Bromberg JS
Transplantation
2015[Sep]; 99
(9
): 1817-28
PMID25839706
show ga
BACKGROUND: Blocking CD40-CD40L costimulatory signals induces transplantation
tolerance. Although B-cell depletion prevents alloantibody formation, nonhumoral
functions of B cells in tolerance have not been well characterized. We
investigated whether specific subsets of B cell or B cell-derived interleukin
(IL)-10 contribute to tolerance. METHODS: Wild type C57BL/6, or B cell-specific
interleukin (IL)-10 (CD19-Cre::IL-10) mice, received vascularized BALB/c cardiac
allografts. BALB/c donor-specific splenocyte transfusion and anti-CD40L
monoclonal antibody were used as tolerogen. B cells were depleted with antimouse
CD20 monoclonal antibody. Various B-cell subsets were purified and characterized
by flow cytometry, reverse transcription polymerase chain reaction, and adoptive
transfer. RESULTS: B-cell depletion prevented costimulatory blockade-induced
allogeneic tolerance. Costimulatory blockade increased IL-10 in marginal zone
precursor (MZP) B cells, but not other subsets. In particular, costimulatory
blockade did not change other previously defined regulatory B-cell subsets
(Breg), including CD5CD1d Breg or expression of TIM1 or TIM4 on these Breg or
other Breg cell subsets. Costimulatory blockade also induced IL-21R expression in
MZP B cells, and IL-21R MZP B cells expressed even more IL-10. B-cell depletion
or IL-10 deficiency in B cells prevented tolerance in a cardiac allograft model,
resulting in rapid acute cardiac allograft rejection. Adoptive transfer of wild
type MZP B cells but not other subsets to B cell-specific IL-10 deficient mice
prevented graft rejection. CONCLUSIONS: CD40 costimulatory blockade induces MZP B
cell IL-10 which is necessary for tolerance. These observations have implications
for understanding tolerance induction and how B cell depletion may prevent
tolerance.
|*Graft Survival
[MESH]
|*Heart Transplantation/adverse effects
[MESH]
|*Transplantation Tolerance
[MESH]
|Adoptive Transfer
[MESH]
|Animals
[MESH]
|Antibodies, Monoclonal/pharmacology
[MESH]
|CD40 Antigens/immunology/metabolism
[MESH]
|CD40 Ligand/immunology/metabolism
[MESH]
|Cells, Cultured
[MESH]
|Graft Rejection/immunology/metabolism/pathology/*prevention & control
[MESH]