Phosphorylation of p62 Activates the Keap1-Nrf2 Pathway during Selective Autophagy

Yoshinobu Ichimura, Satoshi Waguri, Yu shin Sou, Shun Kageyama, Jun Hasegawa, Ryosuke Ishimura, Tetsuya Saito, Yinjie Yang, Tsuguka Kouno, Toshiaki Fukutomi, Takayuki Hoshii, Atsushi Hirao, Kenji Takagi, Tsunehiro Mizushima, Hozumi Motohashi, Myung Shik Lee, Tamotsu Yoshimori, Keiji Tanaka, Masayuki Yamamoto, Masaaki Komatsu

Research output: Contribution to journalArticlepeer-review

535 Citations (Scopus)

Abstract

The Keap1-Nrf2 system and autophagy are both involved in the oxidative-stress response, metabolic pathways, and innate immunity, and dysregulation of these processes is associated with pathogenic processes. However, the interplay between these two pathways remains largely unknown. Here, we show that phosphorylation of the autophagy-adaptor protein p62 markedly increases p62's binding affinity for Keap1, an adaptor of the Cul3-ubiquitin E3 ligasecomplex responsible for degrading Nrf2. Thus, p62 phosphorylation induces expression of cytoprotective Nrf2 targets. p62 is assembled on selective autophagic cargos such as ubiquitinated organelles and subsequently phosphorylated in an mTORC1-dependent manner, implying coupling of the Keap1-Nrf2 system to autophagy. Furthermore, persistent activation of Nrf2 through accumulation of phosphorylated p62 contributes to the growth of human hepatocellular carcinomas (HCCs). These results demonstrate that selective autophagy and the Keap1-Nrf2 pathway are interdependent, and that inhibitors of the interaction between phosphorylated p62 and Keap1 have potential as therapeutic agents against human HCC.

Original languageEnglish
Pages (from-to)618-631
Number of pages14
JournalMolecular Cell
Volume51
Issue number5
DOIs
Publication statusPublished - 2013 Sep 12

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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