Aberrant FBXW7-mediated ubiquitination and degradation of ZMYND8 enhances tumor progression and stemness in bladder cancer

Exp Cell Res. 2021 Oct 15;407(2):112807. doi: 10.1016/j.yexcr.2021.112807. Epub 2021 Sep 3.

Abstract

ZMYND8, an epigenetic regulator, was identified as a common oncogene across various tumors. However, little was reported about the association between ZMYND8 and bladder cancer. Besides, aberrant mechanisms that contribute to abnormal ZMYND8 expressions still remain unclear. In the current study, we first found that ZMYND8 protein levels were significantly elevated in Bca samples versus normal tissues, but not the mRNA levels. We then utilized the Cell Counting Kit-8 (CCK-8) assay, clone formation assay and transwell analysis to confirm that ZMYND8 could remarkably promote the tumor progression in vitro, including growth capacity and migration. Bioinformatic predictive analysis revealed that E3 ubiquitin ligase FBXW7 interacts directly with ZMYND8 and degrades ZMYND8 in a polyubiquitination manner. Low FBXW7 was a hazard factor for promoting and depending on accumulated ZMYND8 proteins to promote Bca progression. Gene set enrichment analysis (GSEA) further indicated that ZMYND8 was notably associated with stemness process, which was well functionally validated. Lastly, ZMYND8 deficiency was observed to inhibit tumor growth of Bca in vivo, revealing a promising translational significance in Bca treatment. In conclusion, our study for the first time provided evidence for a novel mechanism of FBXW7/ZMYND8 axis in Bca, providing therapeutic vulnerability for individualized cancer treatment.

Keywords: Bladder cancer; FBXW7; Progression; Ubiquitination; ZMYND8.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis
  • Biomarkers, Tumor / genetics
  • Biomarkers, Tumor / metabolism*
  • Cell Proliferation
  • F-Box-WD Repeat-Containing Protein 7 / genetics
  • F-Box-WD Repeat-Containing Protein 7 / metabolism*
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Mice, Nude
  • Neoplastic Stem Cells / metabolism
  • Neoplastic Stem Cells / pathology*
  • Prognosis
  • Proteolysis
  • Survival Rate
  • Tumor Cells, Cultured
  • Tumor Suppressor Proteins / genetics
  • Tumor Suppressor Proteins / metabolism*
  • Ubiquitination*
  • Urinary Bladder Neoplasms / genetics
  • Urinary Bladder Neoplasms / metabolism
  • Urinary Bladder Neoplasms / pathology*
  • Xenograft Model Antitumor Assays

Substances

  • Biomarkers, Tumor
  • F-Box-WD Repeat-Containing Protein 7
  • FBXW7 protein, human
  • Tumor Suppressor Proteins
  • ZMYND8 protein, human