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The adoptive transfer of natural regulatory T cells (nTreg) is a new option to reshape undesired immune reactivity in autoimmunity and transplantation toward "tolerance." The first clinical trials using adoptive transfer of polyclonal nTreg demonstrated safety and hints of efficacy. However, the low frequencies of antigen-specific cells among the pool of polyclonal nTreg and their broad antigen nonspecific suppression are limitations of this approach regarding efficacy and safety. Recently, the isolation and expansion of (allo)antigen-specific nTreg have successfully been achieved by using Treg-specific activation markers but the yield is relatively low. Here, we describe a novel good manufacturing practice (GMP)-compatible expansion protocol of alloantigen-specific nTreg based on the stimulation of nTreg by allogeneic activated B cells. Their functionality and specificity are superior compared to polyclonal nTreg both in vitro and in vivo. Employing an allogeneic B cell bank, designed to cover the majority of HLA types, allows fast GMP-compliant manufacturing for donor-specific nTreg for clinical application in organ and stem cell transplantation. TCR repertoire analyses by next generation sequencing revealed impressive expansion by several log-steps of even very low-abundance alloantigen-specific nTreg clones. This novel method offers a simple approach for expanding antigen-specific nTreg and is characterized by high replicability and easy transferability to full GMP standards.

Original publication

DOI

10.1111/ajt.12629

Type

Journal article

Journal

Am J Transplant

Publication Date

03/2014

Volume

14

Pages

594 - 606

Keywords

Cell therapy, clinical application, regulatory T cells, tolerance, transplantation, Adoptive Transfer, Animals, B-Lymphocytes, Cells, Cultured, Clinical Protocols, DNA-Binding Proteins, Graft Rejection, Histocompatibility Testing, Humans, Immune Tolerance, Immunosuppression, Isoantigens, Lymphocyte Activation, Mice, Mice, Inbred BALB C, Receptors, Antigen, T-Cell, Skin Transplantation, T-Lymphocytes, Regulatory