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You, Menghao; Liu, Jingjing; Li, Jie; Ji, Ce; Ni, Haochen; Guo, Wenhui; Zhang, Jiarui; Jia, Weiwei; Wang, Zhao; Zhang, Yajiao; Yao, Yingpeng; Yu, Guotao; Ji, Huanyu; Wang, Xiaohu; Han, Dali; Du, Xuguang; Xu, Meng Michelle; Yu, Shuyang
Cell reports (Cambridge), 2023-Jun-01, Letnik: 42, Številka: 6Journal Article
N -methyladenosine (m A) methyltransferase Mettl3 is involved in conventional T cell immunity; however, its role in innate immune cells remains largely unknown. Here, we show that Mettl3 intrinsically regulates invariant natural killer T (iNKT) cell development and function in an m A-dependent manner. Conditional ablation of Mettl3 in CD4 CD8 double-positive (DP) thymocytes impairs iNKT cell proliferation, differentiation, and cytokine secretion, which synergistically causes defects in B16F10 melanoma resistance. Transcriptomic and epi-transcriptomic analyses reveal that Mettl3 deficiency disturbs the expression of iNKT cell-related genes with altered m A modification. Strikingly, Mettl3 modulates the stability of the Creb1 transcript, which in turn controls the protein and phosphorylation levels of Creb1. Furthermore, conditional targeting of Creb1 in DP thymocytes results in similar phenotypes of iNKT cells lacking Mettl3. Importantly, ectopic expression of Creb1 largely rectifies such developmental defects in Mettl3-deficient iNKT cells. These findings reveal that the Mettl3-m A-Creb1 axis plays critical roles in regulating iNKT cells at the post-transcriptional layer.
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