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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Eur+J+Immunol 2014 ; 44 (6): 1728-36 Nephropedia Template TP
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TGF-?-producing regulatory B cells induce regulatory T cells and promote transplantation tolerance #MMPMID24700192
Lee KM; Stott RT; Zhao G; SooHoo J; Xiong W; Lian MM; Fitzgerald L; Shi S; Akrawi E; Lei J; Deng S; Yeh H; Markmann JF; Kim JI
Eur J Immunol 2014[Jun]; 44 (6): 1728-36 PMID24700192show ga
Regulatory B cells (Bregs) have been shown to play a critical role in immune homeostasis and in autoimmunity models. We have recently demonstrated that combined anti-TIM-1 and anti-CD45RB antibody treatment results in tolerance to full MHC-mismatched islet allografts in mice by generating Bregs that are necessary for tolerance. Bregs are antigen-specific and are capable of transferring tolerance to untreated, transplanted animals. Here we demonstrate that adoptively transferred Bregs require the presence of Tregs to establish tolerance, and that adoptive transfer of Bregs increases the number of Tregs. Interaction with Bregs in vivo induces significantly more Foxp3 expression in CD4+CD25? T cells than with naive B cells. We also show that Bregs express the TGF-? associated latency-associated peptide (LAP) and that Breg-mediated graft prolongation post-adoptive transfer is abrogated by neutralization of TGF-? activity. Regulatory B cells, like regulatory T cells, demonstrate preferential expression of both CCR6 and CXCR3. Collectively, these findings suggest that in this model of antibody-induced transplantation tolerance, Bregs promote graft survival by promoting Treg development, possibly via TGF-? production.