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Xiong, Jia; He, Jia; Zhu, Jun; Pan, Jiongli; Liao, Weijie; Ye, Hongying; Wang, Haofei; Song, Yinjing; Du, Yue; Cui, Bijun; Xue, Maoguang; Zheng, Wanling; Kong, Xiangxing; Jiang, Kai; Ding, Kefeng; Lai, Lihua; Wang, Qingqing
Molecular cell, 2022-May-05, Volume: 82, Issue: 9Journal Article
Tumor-infiltrating myeloid cells (TIMs) are crucial cell populations involved in tumor immune escape, and their functions are regulated by multiple epigenetic mechanisms. The precise regulation mode of RNA N -methyladenosine (m A) modification in controlling TIM function is still poorly understood. Our study revealed that the increased expression of methyltransferase-like 3 (METTL3) in TIMs was correlated with the poor prognosis of colon cancer patients, and myeloid deficiency of METTL3 attenuated tumor growth in mice. METTL3 mediated m A modification on Jak1 mRNA in TIMs, the m A-YTHDF1 axis enhanced JAK1 protein translation efficiency and subsequent phosphorylation of STAT3. Lactate accumulated in tumor microenvironment potently induced METTL3 upregulation in TIMs via H3K18 lactylation. Interestingly, we identified two lactylation modification sites in the zinc-finger domain of METTL3, which was essential for METTL3 to capture target RNA. Our results emphasize the importance of lactylation-driven METTL3-mediated RNA m A modification for promoting the immunosuppressive capacity of TIMs.
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