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Deacetylation Assays to Unravel the Interplay between Sirtuins SIRT2 and Specific Protein-substrates
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SPOP promotes SIRT2 degradation and suppresses non-small cell lung cancer cell growth

Jie Luo1, Yu-Chen Bao1, Xian-Xiu Ji1

  • 1Department of Medical Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, 507 Zhengmin Road, Shanghai 200433, China.

Biochemical and Biophysical Research Communications
|January 12, 2017
PubMed

Insights

Speckle-type POZ protein (SPOP) targets SIRT2 for degradation, suppressing non-small cell lung cancer (NSCLC) growth. Reduced SPOP and elevated SIRT2 levels in NSCLC suggest a role in tumor progression.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • SIRT2, a NAD-dependent deacetylase, exhibits anticancer properties upon inhibition.
  • Understanding the regulation of SIRT2 is crucial for developing novel cancer therapies.

Purpose of the Study:

  • To investigate the interaction between SPOP and SIRT2.
  • To elucidate the role of SPOP in regulating SIRT2 levels and its impact on non-small cell lung cancer (NSCLC) progression.

Main Methods:

  • Co-immunoprecipitation assays to confirm SPOP-SIRT2 binding.
  • Proteasome inhibition studies using MG132.
  • Western blot analysis to quantify protein levels in NSCLC cell lines and tissues.
  • Assessment of NSCLC cell growth and the effect of SPOP mutations.

Main Results:

  • SPOP binds to SIRT2 and mediates its degradation via the 26S proteasome.
  • SPOP levels were decreased, while SIRT2 levels were increased in NSCLC cells and tissues compared to normal controls.
  • SPOP suppressed NSCLC cell growth, and mutations in NSCLC impaired SPOP's ability to degrade SIRT2 and inhibit cell growth.

Conclusions:

  • SPOP-mediated degradation of SIRT2 is a novel regulatory mechanism.
  • This SPOP-SIRT2 interaction is critical for controlling lung tumor cell growth.
  • Dysregulation of SPOP and SIRT2 contributes to NSCLC pathogenesis.
Keywords:
Cell growthDegradationLung cancerMutationSIRT2SPOP

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