Hepatitis E virus infection remodels the mature tRNAome in macrophages to orchestrate NLRP3 inflammasome response

Yunlong Li, Ruyi Zhang, Yining Wang, Pengfei Li, Yang Li, Harry L.A. Janssen, Robert A. De Man, Maikel P. Peppelenbosch, Ou Xumin*, Pan Qiuwei*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Hepatitis E virus (HEV) infection has been shown to activate NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome in macrophages, a key mechanism of causing pathological inflammation, but the mechanisms regulating this response remain poorly understood. Here, we report that the mature tRNAome dynamically responds to HEV infection in macrophages. This directs IL-1β expression, the hallmark of NLRP3 inflammasome activation, at mRNA and protein levels. Conversely, pharmacological inhibition of inflammasome activation abrogates HEV-provoked tRNAome remodeling, revealing a reciprocal interaction between the mature tRNAome and the NLRP3 inflammasome response. Remodeling the tRNAome results in improved decoding of codons directing leucine-and proline synthesis, which are the major amino acid constituents of IL-1β protein, whereas genetic or functional interference with tRNAome-mediated leucine decoding impairs inflammasome activation. Finally, we demonstrated that the mature tRNAome also actively responds to lipopolysaccharide (a key component of gram-negative bacteria)-triggered inflammasome activation, but the response dynamics and mode of actions are distinct from that induced by HEV infection. Our findings thus reveal the mature tRNAome as a previously unrecognized but essential mediator of host response to pathogens and represent a unique target for developing anti-inflammatory therapeutics.

Original languageEnglish
Article numbere2304445120
JournalProceedings of the National Academy of Sciences of the United States of America
Volume120
Issue number25
Early online date12 Jun 2023
DOIs
Publication statusPublished - 20 Jun 2023

Bibliographical note

Funding Information: This research is supported by a VIDI grant (no. 91719300) from the Dutch Research Council (NWO) to Q.P. and a grant from National Natural Science Foundation of China (no. 32102706) to X.O.

Publisher Copyright: Copyright © 2023 the Author(s).

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