Yixuan Wang, Xiang Xiao, Gangcheng Kong, Mou Wen, Guangchuan Wang, Rafik M Ghobrial, Nianguo Dong, Wenhao Chen, Xian C Li
T cells must be activated and become effectors first before executing allograft rejection, a process that is regulated by diverse signals and transcription factors. In this study, we studied the basic leucine zipper ATF-like transcription factor (BATF) family members in regulating T cell activities in a heart transplant model and found that mice deficient for both BATF and BATF3 (Batf Batf3 mice) spontaneously accept the heart allografts long-term without tolerizing therapies. Similarly, adoptive transfer of wild type T cells into Rag1 hosts induced prompt rejection of heart and skin allografts, whereas the Batf Batf3 T cells failed to do so. Analyses of graft-infiltrating cells showed that Batf Batf3 T cells infiltrate the graft but fail to acquire an effector phenotype (CD44 KLRG1 ). Co-transfer experiments in a T cell receptor transgenic TEa model revealed that the Batf Batf3 T cells fail to expand in vivo, retain a quiescent phenotype (CD62L CD127 ), and unable to produce effector cytokines to alloantigen stimulation, which contrasted sharply to that of wild type T cells. Together, our data demonstrate that the BATF and BATF3 are critical regulators of T effector functions, thus making them attractive targets for therapeutic interventions in transplant settings.
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Allografts
Animals
Basic-Leucine Zipper Transcription Factors
Gene Expression Regulation
Interferon Regulatory Factors
Mice
Mice, Inbred C57BL
Mice, Knockout
T-Lymphocytes