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Identification and Characterization of Separase Inhibitors (Sepins) for Cancer Therapy

Nenggang Zhang1, Kathleen Scorsone1, Gouqing Ge1

  • 1Texas Children's Cancer Center, and Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.

Journal of Biomolecular Screening
|February 15, 2014
PubMed

Insights

Researchers identified Sepin-1, a novel small-molecule inhibitor that targets the enzyme separase. This compound effectively inhibits cancer cell proliferation and tumor growth, offering a potential new strategy for cancer therapy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Separase is a crucial endopeptidase regulating DNA repair and sister chromatid cohesion.
  • Separase overexpression is linked to tumorigenesis and is observed in various human cancers.
  • Targeting overexpressed separase presents a potential therapeutic strategy for cancer treatment.

Purpose of the Study:

  • To develop and identify small-molecule inhibitors of separase (Sepins).
  • To investigate the potential of separase inhibition as a cancer treatment strategy.
  • To elucidate the mechanism of separase function in cancer.

Main Methods:

  • High-throughput screening of a small-molecule compound library.
  • Development of a fluorogenic separase assay using a Rad21 peptide substrate.
  • Testing Sepin-1's efficacy in human cancer cell lines and mouse xenograft models.

Main Results:

  • Identification of Sepin-1, a noncompetitive separase inhibitor with an IC50 of 14.8 µM.
  • Sepin-1 demonstrated inhibition of cancer cell proliferation and induction of apoptosis.
  • Tumor growth in mice was suppressed by Sepin-1, with sensitivity correlating to separase levels.

Conclusions:

  • Sepin-1 is a potent inhibitor of separase enzymatic activity.
  • Sepin-1 exhibits anti-cancer effects by inhibiting proliferation and inducing apoptosis.
  • Separase levels correlate with sensitivity to Sepin-1, suggesting its potential as a biomarker and therapeutic target.
Keywords:
Separasebreast cancerhigh-throughput screeningsmall-molecular inhibitors

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