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Journal Article
Research Support, Non-U.S. Gov't
Induced regulatory T cells modified by knocking down T-bet in combination with ectopic expression of inhibitory cytokines effectively protect graft-versus-host disease.
American Journal of Transplantation 2023 July
Induced regulatory T (iTreg ) cells play a vital role in immune tolerance and in controlling chronic inflammation. Generated in the periphery, iTreg cells are suitable for responding to alloantigens and preventing transplant rejection. Nevertheless, their clinical application has been impeded by the plasticity and instability attributed to the loss of forkhead box protein 3 expression, raising concerns that iTreg may be converted to effector T cells and even exert a pathogenic effect. Herein, second-generation short hairpin RNAs loaded with 3 pairs of small interfering RNAs were utilized to target the T-box transcription factor TBX21. In addition, 2 immunosuppressive cytokines, namely, transforming growth factor beta and interleukin 10, were constitutively expressed. This novel engineering strategy allowed the generation of stably induced regulatory T (SI Treg ) cells, which maintained the expression of forkhead box protein 3 even in an unfavorable environment and exerted potent immunosuppressive functions in vitro. Furthermore, SI Treg cells demonstrated an effector transcriptional profile. Finally, SI Treg cells showed a significant protective effect against graft-versus-host disease-related deaths in a xenotransplantation model. Collectively, these results signify that SI Treg cells hold great promise for future clinical application and offer a rational therapeutic approach for transplant rejection.
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