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T cells expressing chimeric antigen receptor promote immune tolerance #MMPMID29046484
Pierini A; Iliopoulou BP; Peiris H; Pérez-Cruz M; Baker J; Hsu K; Gu X; Zheng PP; Erkers T; Tang SW; Strober W; Alvarez M; Ring A; Velardi A; Negrin RS; Kim SK; Meyer EH
JCI Insight ä[]; 2 (20): ä PMID29046484show ga
Cellular therapies based on permanent genetic modification of conventional T cells have emerged as a promising strategy for cancer. However, it remains unknown if modification of T cell subsets, such as Tregs, could be useful in other settings, such as allograft transplantation. Here, we use a modular system based on a chimeric antigen receptor (CAR) that binds covalently modified mAbs to control Treg activation in vivo. Transient expression of this mAb-directed CAR (mAbCAR) in Tregs permitted Treg targeting to specific tissue sites and mitigated allograft responses, such as graft-versus-host disease. mAbCAR Tregs targeted to MHC class I proteins on allografts prolonged islet allograft survival and also prolonged the survival of secondary skin grafts specifically matched to the original islet allograft. Thus, transient genetic modification to produce mAbCAR T cells led to durable immune modulation, suggesting therapeutic targeting strategies for controlling alloreactivity in settings such as organ or tissue transplantation.