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Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples
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Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples

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The deubiquitinating enzyme USP20 regulates the stability of the MCL1 protein

Jinan Feng1, Pengyang Liu2, Xiaonan Li3

  • 1Department of Central Laboratory, Luoyang Central Hospital Affiliated to Zhengzhou University, Xigong District, Luoyang, Henan, China; The School of Basic Medical Sciences, Fujian Medical University, Minhou, Fuzhou, China.

Biochemical and Biophysical Research Communications
|January 22, 2022
PubMed

Insights

Ubiquitin-Specific Protease 20 (USP20) stabilizes MCL1, a protein promoting cancer cell survival. Inhibiting USP20 enhances chemotherapy effectiveness in esophageal cancer by targeting this key axis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biochemistry

Background:

  • Chemoresistance presents a significant challenge in esophageal cancer treatment, often leading to poor patient outcomes.
  • MCL1, an anti-apoptotic protein, is crucial for cell survival and chemoresistance, making it a potential therapeutic target.
  • The deubiquitylating enzyme (DUB) responsible for MCL1 stabilization remained unidentified, hindering targeted therapeutic strategies.

Purpose of the Study:

  • To identify the deubiquitylating enzyme (DUB) regulating MCL1 stability.
  • To investigate the role of Ubiquitin-Specific Protease 20 (USP20) in the apoptotic signaling pathway and its connection to MCL1.
  • To explore the therapeutic potential of targeting the USP20-MCL1 axis in esophageal cancer.

Main Methods:

  • Investigated the interaction between USP20 and MCL1.
  • Assessed the effect of USP20 depletion on MCL1 ubiquitination and stability.
  • Analyzed USP20 and MCL1 expression levels in human patient samples.
  • Evaluated the impact of USP20 modulation on chemoresistance in esophageal cancer cells.

Main Results:

  • Ubiquitin-Specific Protease 20 (USP20) was identified as a novel regulator of the apoptotic signaling pathway.
  • USP20 directly deubiquitinates MCL1, thereby controlling its stability.
  • Increased USP20 expression correlated with elevated MCL1 protein levels in patient samples.
  • Depletion of USP20 led to increased MCL1 polyubiquitination, enhancing cancer cell sensitivity to chemotherapy.

Conclusions:

  • The USP20-MCL1 axis plays a critical role in regulating apoptosis and chemoresistance in esophageal cancer.
  • USP20 stabilizes MCL1, contributing to cancer cell survival and treatment resistance.
  • Targeting the USP20-MCL1 interaction represents a promising therapeutic strategy to overcome chemoresistance in esophageal cancer.
Keywords:
ChemoresistanceDeubiquitinating enzymeMCL1Oesophageal cancerUSP20

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