The deubiquitinase USP7 regulates oxidative stress through stabilization of HO-1

Ming Gao, Zijuan Qi, Min Deng, Hongyang Huang, Zhijie Xu, Guijie Guo, Jiajun Jing, Xiaofeng Huang, Ming Xu, Jake A. Kloeber, Sijin Liu, Jinzhou Huang, Zhenkun Lou, Jinxiang Han

Research output: Contribution to journalArticlepeer-review


Heme oxygenase-1 (HO-1) is an inducible heme degradation enzyme that plays a cytoprotective role against various oxidative and inflammatory stresses. However, it has also been shown to exert an important role in cancer progression through a variety of mechanisms. Although transcription factors such as Nrf2 are involved in HO-1 regulation, the posttranslational modifications of HO-1 after oxidative insults and the underlying mechanisms remain unexplored. Here, we screened and identified that the deubiquitinase USP7 plays a key role in the control of redox homeostasis through promoting HO-1 deubiquitination and stabilization in hepatocytes. We used low-dose arsenic as a stress model which does not affect the transcriptional level of HO-1, and found that the interaction between USP7 and HO-1 is increased after arsenic exposure, leading to enhanced HO-1 expression and attenuated oxidative damages. Furthermore, HO-1 protein is ubiquitinated at K243 and subjected to degradation under resting conditions; whereas when after arsenic exposure, USP7 itself can be ubiquitinated at K476, thereafter promoting the binding between USP7 and HO-1, finally leading to enhanced HO-1 deubiquitination and protein accumulation. Moreover, depletion of USP7 and HO-1 inhibit liver tumor growth in vivo, and USP7 positively correlates with HO-1 protein level in clinical human hepatocellular carcinoma (HCC) specimens. In summary, our findings reveal a critical role of USP7 as a HO-1 deubiquitinating enzyme in the regulation of oxidative stresses, and suggest that USP7 inhibitor might be a potential therapeutic agent for treating HO-1 overexpressed liver cancers.

Original languageEnglish (US)
Pages (from-to)4018-4027
Number of pages10
Issue number33
StatePublished - Aug 12 2022

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research


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