Broad Spectrum Deubiquitinase Inhibition Induces Both Apoptosis and Ferroptosis in Cancer Cells

Li Yang, Xin Chen, Qianqian Yang, Jinghong Chen, Qingtian Huang, Leyi Yao, Ding Yan, Jiawen Wu, Peiquan Zhang, Daolin Tang, Nanshan Zhong, Jinbao Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Proteasomal deubiquitinase (DUB) inhibition has been found to be effective in experimental cancer therapy by inducing proteasome inhibition and apoptosis. Ferroptosis is a form of regulated cell death characterized by an iron-dependent lipid peroxidation. Antioxidant enzyme glutathione peroxidase 4 (GPX4) plays a key role in blocking ferroptosis through directly reducing phospholipid hydroperoxides production. Since cytoplasmic DUB inhibition can promote protein degradation in the cell, we hypothesize that DUB inhibition induces GPX4 degradation. Here we used palladium pyrithione complex (PdPT), a broad spectrum deubiquitinase inhibitor, to explore its cell death induction and anti-cancer effect in vitro, ex vivo, and in vivo. Mechanically, caspase activation and GPX4 protein degradation are required for PdPT-induced apoptosis and ferroptosis, respectively. Notably, PdPT-induced multiple deubiquitinase inhibition is essential for proteasomal degradation of GPX4. These findings not only identify a novel mechanism of post-translational modification of GPX4 in ferroptosis, but also suggest a potential anti-caner therapeutic strategy using Pan-DUB inhibition.

Original languageEnglish (US)
Article number949
JournalFrontiers in Oncology
Volume10
DOIs
StatePublished - Jun 12 2020

Keywords

  • GPX4
  • apoptosis
  • cancer
  • deubiquitinase
  • ferroptosis

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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