USP8 prevents aberrant NF-κB and Nrf2 activation by counteracting ubiquitin signals from endosomes

Akinori Endo, Toshiaki Fukushima, Chikage Takahashi, Hikaru Tsuchiya, Fumiaki Ohtake, Sayaka Ono, Tony Ly, Yukiko Yoshida, Keiji Tanaka, Yasushi Saeki (Lead / Corresponding author), Masayuki Komada (Lead / Corresponding author)

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Abstract

K63-linked ubiquitin chains attached to plasma membrane proteins serve as tags for endocytosis and endosome-to-lysosome sorting. USP8 is an essential deubiquitinase for the maintenance of endosomal functions. Prolonged depletion of USP8 leads to cell death, but the major effects on cellular signaling pathways are poorly understood. Here, we show that USP8 depletion causes aberrant accumulation of K63-linked ubiquitin chains on endosomes and induces immune and stress responses. Upon USP8 depletion, two different decoders for K63-linked ubiquitin chains, TAB2/3 and p62, were recruited to endosomes and activated the TAK1-NF-κB and Keap1-Nrf2 pathways, respectively. Oxidative stress, an environmental stimulus that potentially suppresses USP8 activity, induced accumulation of K63-linked ubiquitin chains on endosomes, recruitment of TAB2, and expression of the inflammatory cytokine. The results demonstrate that USP8 is a gatekeeper of misdirected ubiquitin signals and inhibits immune and stress response pathways by removing K63-linked ubiquitin chains from endosomes.

Original languageEnglish
Article numbere202306013
Number of pages21
JournalJournal of Cell Biology
Volume223
Issue number3
Early online date5 Jan 2024
DOIs
Publication statusPublished - 4 Mar 2024

Keywords

  • Endosomes/genetics
  • Kelch-Like ECH-Associated Protein 1/genetics
  • NF-E2-Related Factor 2/genetics
  • NF-kappa B/genetics
  • Ubiquitin/genetics
  • Humans
  • Ubiquitin Thiolesterase/genetics
  • Endosomal Sorting Complexes Required for Transport/genetics

ASJC Scopus subject areas

  • Cell Biology

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