Cited by 209Ubiquitin and proteasome pathwaysEpigenetics and DNA MethylationCancer-related gene regulation

Stabilization of histone demethylase PHF8 by USP7 promotes breast carcinogenesis.

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Wang, Qian, Ma, Shuai, Song, Nan, Li, Xin, Liu, Ling, Yang, Shangda, Ding, Xiang, Shan, Lin +10 more·2016·Journal of Clinical Investigation

Abstract

The histone demethylase PHF8 has been implicated in multiple pathological disorders, including X-linked mental retardation and tumorigenesis. However, it is not clear how the abundance and function of PHF8 are regulated. Here, we report that PHF8 physically associates with the deubiquitinase USP7. Specifically, we demonstrated that USP7 promotes deubiquitination and stabilization of PHF8, leading to the upregulation of a group of genes, including cyclin A2, that are critical for cell growth and proliferation. The USP7-encoding gene was also transcriptionally regulated by PHF8, via positive feedback. USP7 was overexpressed in breast carcinomas, and the level of expression positively correlated with expression of PHF8 and cyclin A2 and with the histological grade of breast cancer. We showed that USP7 promotes breast carcinogenesis by stabilizing PHF8 and upregulating cyclin A2 and that the interaction between USP7 and PHF8 is augmented during DNA damage. Moreover, USP7-promoted PHF8 stabilization conferred cellular resistance to genotoxic insults and was required for the recruitment of BLM and KU70, which are both essential for DNA double-strand break repair. Our study mechanistically links USP7 to epigenetic regulation and DNA repair. Moreover, these data support the pursuit of USP7 and PHF8 as potential targets for breast cancer intervention, especially in combination with chemo- or radiotherapies.

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Crossref · 10.1172/jci85747

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  • Several well-characterized USP7 substrates, including p53, PHF8, and PLK1, are known to be key regulators of cell cycle progression and cellular proliferation-processes fundamental to HSC maintenance.

    “several well-characterized USP7 substrates, including p53 30, PHF8 31, and PLK1 32, are known to be key regulators of cell cycle progression and cellular proliferation—processes fundamental to HSC maintenance.”
  • PHF8 interacts with Ku70 and the BLM helicase to facilitate their localization to sites of DSBs.

    “In addition to the transcriptional regulation of cyclin A2, PHF8 interacts with Ku70 and the BLM helicase to facilitate their localization to sites of DSBs.”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Wang et al., 2016

  • Depletion of USP7 greatly compromises the repair of DSBs by either NHEJ or HR.

    “The depletion of USP7 from cells has been found to greatly compromise the repair of DSBs by either NHEJ or HR (Wang et al., 2016; An et al., 2017).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Wang et al., 2016

  • Recruitment of Ku70 or BLM is impaired in cells following PHF8 or USP7 depletion.

    “Indeed, the recruitment of either protein is impaired in cells following PHF8 or USP7 depletion (Wang et al., 2016).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Wang et al., 2016

  • USP7, PHF8 and cyclin A2 were all found to be upregulated in several breast cancers, as well as in colon and rectum cancers, compared to adjacent tissues.

    “Indeed, USP7, PHF8 and cyclin A2 were all found to be upregulated in several breast cancers, as well as in colon and rectum cancers, compared to adjacent tissues (Wang et al., 2016).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Wang et al., 2016

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Authors
Wang, Q., Ma, S., Song, N., Li, X., Liu, L., Yang, S., Ding, X., Shan, L., Zhou, X., Su, D., Wang, Y., Zhang, Q., Liu, X., Yu, N., Zhang, K., Shang, Y., Yao, Z., & Shi, L.
Affiliations
  • Tianjin Medical University (CN)
  • Chinese Academy of Sciences (CN)
  • Peking University (CN)
Corresponding author
  • Yao, Zhi
  • Shi, Lei
Venue
Journal of Clinical Investigation
Published
2016-05-16
Volume
126
Issue
6
Pages
2205-2220
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W2381681988
Cited by
206
References
65
Citations by year
2026: 13 · 2025: 16 · 2024: 25 · 2023: 19 · 2022: 23 · 2021: 17 · 2020: 30 · 2019: 24 · 2018: 16 · 2017: 18 · 2016: 5
FWCI
10.92
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Tianjin Medical University
  • National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer-related gene regulation
Keywords
PHF8, USP7, histone demethylase, protein stabilization, deubiquitination, breast cancer, cyclin A2, DNA double-strand break repair, BLM, Ku70, DNA damage response, epigenetic regulation, positive feedback loop, histone demethylation
MeSH terms
Ubiquitin-Specific Peptidase 7, Breast Neoplasms, DNA Damage, DNA Repair, Enzyme Stability, Female, Humans, Transcription Factors, Up-Regulation, RNA, Small Interfering, Ubiquitin Thiolesterase, Epigenesis, Genetic, Protein Interaction Domains and Motifs, Histone Demethylases, Cyclin A2, MCF-7 Cells, Carcinogenesis

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