Hyperthermia-Induced Apoptosis Regulated by Nitric Oxide-Mediated Suppression of NF kappa B

Strategic Insights -

Hyperthermia, or heat therapy, has been shown to induce apoptosis in cancer cells, particularly in breast cancer cells. Recent research published in the Journal of Cellular Biochemistry has investigated the regulatory mechanisms of hyperthermia-induced apoptosis in MCF-7 breast cancer cells. The study found that hyperthermia exposure at 43°C increases intracellular nitric oxide (NO) levels, which in turn inhibits NF kappa B-DNA binding activity, leading to apoptosis. The researchers also discovered that inhibition of NO by L-NAME rescues NF kappa B-DNA binding activity and inhibits heat-induced apoptosis.

Key Takeaways:

  • Hyperthermia exposure at 43°C induces apoptosis in MCF-7 breast cancer cells by increasing intracellular NO levels.
  • NO-mediated suppression of NF kappa B-DNA binding activity is a crucial intermediate step in hyperthermia-induced apoptosis.
  • Inhibition of NO by L-NAME rescues NF kappa B-DNA binding activity and inhibits heat-induced apoptosis.
  • Over-expression of NF kappa B by transient transfection inhibits heat-induced apoptosis.
  • Hyperthermia-mediated inhibition of NF kappa B is persistent even after 48 hours.
  • Apoptosis measured by Annexin V expression and cell survival by clonogenic assay showed a 20% increase in apoptosis after 43°C treatments.

Statistics:

  • 20% increase in apoptosis after 43°C treatments.
  • 43°C hyperthermia exposure increases intracellular NO levels.
  • 48 hours: hyperthermia-mediated inhibition of NF kappa B remains persistent.
  • 20% increase in apoptosis corresponds to a significant reduction in cell survival.

Sources:

  • Journal of Cellular Biochemistry, Vol. 106, Issue 6, 2009
  • N. Aravindan et al., "Nitric Oxide-Mediated Inhibition of NF kappa B Regulates Hyperthermia-Induced Apoptosis." Journal of Cellular Biochemistry, 2009;106(6):999-1009
  • Cancer Weekly, "Hyperthermia-Induced Apoptosis in Breast Cancer Cells Regulated by Nitric Oxide-Mediated Suppression of NF kappa B." NewsRx.com, 2009.