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Opposing Effects of Baicalein on Securin and gamma-H2AX Regulate Cell Viability

Strategic Insights

— 1 min read

Scientists in Hsinchu, Taiwan, have investigated the role of securin and gamma-H2AX in baicalein-induced cancer cell death. Baicalein, a natural flavonoid, reduced cell viability in various human cancer cell lines, including bladder, cervical, colon, and lung cancer cells. The study found that baicalein treatment significantly inhibited securin expression while elevating gamma-H2AX levels, leading to abnormal spindle formation and chromosomal segregation. The researchers discovered that wild-type cancer cells were more susceptible to baicalein-induced cytotoxicity and apoptosis compared to securin-null cells, highlighting the opposing effects of baicalein on securin and gamma-H2AX levels.

Key Takeaways:

  • Baicalein, a natural flavonoid, reduced cell viability in various human cancer cell lines, including bladder, cervical, colon, and lung cancer cells.
  • Baicalein treatment significantly inhibited securin expression while elevating gamma-H2AX levels, leading to abnormal spindle formation and chromosomal segregation.
  • Wild-type cancer cells were more susceptible to baicalein-induced cytotoxicity and apoptosis compared to securin-null cells.
  • Transfection with H2AX siRNA further increased baicalein-induced cell death, suggesting a role for gamma-H2AX in regulating cell survival.
  • Blockade of the AKT pathway by treatment with wortmannin or AKT shRNA lowered the levels of gamma-H2AX and enhanced cytotoxicity in baicalein-treated cells.

Statistics:

  • Baicalein treatment (40-80 mcM for 24 h) significantly inhibited securin expression.
  • gamma-H2AX levels were elevated in response to baicalein treatment.
  • Wild type HCT116 cancer cells had a higher incidence of cytotoxicity (83.3%) compared to securin-null HCT116 cells (16.7%).
  • Baicalein increased the levels of gamma-H2AX to a similar extent in both wild-type and securin-null cells.
  • 40-80 mcM baicalein treatment for 24 h induced abnormal spindle formation and chromosomal segregation.

Sources:

  • R.H. Jiang et al., "Opposite Expression of Securin and gamma-H2AX Regulates Baicalein-Induced Cancer Cell Death. Journal of Cellular Biochemistry, 2010;111(2):274-283."
  • J.I. Chao, National Chiao Tung University, Molecular Anticanc Laboratory, Dept. of Biology Science & Technology, 75 Bo Ai St., Hsinchu 30068, Taiwan.
  • Publisher contact information for the Journal of Cellular Biochemistry: Wiley-Liss, Division John Wiley & Sons Inc., 111 River St., Hoboken, NJ 07030, USA.

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