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m 6 A RNA methyltransferases METTL3/14 regulate immune responses to anti‐PD‐1 therapy
Author(s) -
Wang Lingling,
Hui Hui,
Agrawal Kriti,
Kang Yuqi,
Li Na,
Tang Rachel,
Yuan Jiajun,
Rana Tariq M
Publication year - 2020
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.15252/embj.2020104514
Subject(s) - biology , methyltransferase , rna , immune system , genetics , methylation , dna , gene
An impressive clinical success has been observed in treating a variety of cancers using immunotherapy with programmed cell death‐1 (PD‐1) checkpoint blockade. However, limited response in most patients treated with anti‐PD‐1 antibodies remains a challenge, requiring better understanding of molecular mechanisms limiting immunotherapy. In colorectal cancer (CRC) resistant to immunotherapy, mismatch‐repair‐proficient or microsatellite instability‐low (pMMR‐MSI‐L) tumors have low mutation burden and constitute ~85% of patients. Here, we show that inhibition of N 6 ‐methyladenosine (m 6 A) mRNA modification by depletion of methyltransferases, Mettl3 and Mettl14, enhanced response to anti‐PD‐1 treatment in pMMR‐MSI‐L CRC and melanoma. Mettl3‐ or Mettl14‐deficient tumors increased cytotoxic tumor‐infiltrating CD8 + T cells and elevated secretion of IFN‐γ, Cxcl9, and Cxcl10 in tumor microenvironment in vivo . Mechanistically, Mettl3 or Mettl14 loss promoted IFN‐γ‐Stat1‐Irf1 signaling through stabilizing the Stat1 and Irf1 mRNA via Ythdf2. Finally, we found a negative correlation between METTL3 or METTL14 and STAT1 in 59 patients with pMMR‐MSI‐L CRC tumors. Altogether, our findings uncover a new awareness of the function of RNA methylation in adaptive immunity and provide METTL3 and METTL14 as potential therapeutic targets in anticancer immunotherapy.

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