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SBF-1 exerts strong anticervical cancer effect through inducing endoplasmic reticulum stress-associated cell death

W Li1, Z Ouyang1, Q Zhang1

  • 1State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, China.

Cell Death & Disease
|December 19, 2014
PubMed

Insights

A synthetic compound, SBF-1, effectively inhibits cervical cancer growth by targeting sarco/ER Ca2+-ATPase 2 (SERCA2). This disruption of calcium homeostasis leads to endoplasmic reticulum (ER) stress and cell death, highlighting SERCA2 as a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Cervical cancer remains a significant global health challenge, necessitating novel therapeutic strategies.
  • Understanding the molecular mechanisms underlying cancer cell proliferation and survival is crucial for developing targeted treatments.

Purpose of the Study:

  • To investigate the anti-cancer effects of the synthetic steroidal glycoside SBF-1 against human cervical cancer cells.
  • To elucidate the molecular target and mechanism of action of SBF-1 in cervical cancer.

Main Methods:

  • In vitro and in vivo studies using HeLa cervical cancer cells and xenografts.
  • Biotinylation of SBF-1 to identify its protein target.
  • Assays to measure cell growth, migration, colony formation, endoplasmic reticulum (ER) stress, and calcium (Ca2+) homeostasis.
  • Gene knockdown and overexpression of the target protein SERCA2.
  • Analysis of SERCA2 expression in human cervical cancer tissues.

Main Results:

  • SBF-1 demonstrated potent antigrowth activity against HeLa cells, suppressing proliferation, migration, and colony formation.
  • SBF-1 induced significant endoplasmic reticulum (ER) stress and cell death, which was partially reversed by a chemical chaperone.
  • SBF-1 directly binds to and inhibits sarco/ER Ca2+-ATPase 2 (SERCA2), disrupting ER Ca2+ levels and increasing cytosolic Ca2+.
  • SERCA2 knockdown enhanced SBF-1 sensitivity, while overexpression reduced it, confirming SERCA2's role in SBF-1's mechanism.
  • SBF-1 treatment of xenografts led to growth suppression and apoptosis, linked to ER stress and SERCA2 inhibition.
  • SERCA2 expression was significantly elevated in human cervical cancer tissues and correlated with clinical stage.

Conclusions:

  • SBF-1 effectively inhibits cervical cancer progression by disrupting calcium homeostasis and inducing ER stress via direct inhibition of SERCA2.
  • SERCA2 is identified as a key molecular target and a potential therapeutic target for human cervical cancer treatment.

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