Apoptotic Activity of Caged Xanthones in Cholangiocarcinoma Cell Lines

Strategic Insights -

Scientists at Khon Kaen University in Thailand have made new findings on the growth inhibitory mechanism of caged xanthones from Garcinia hanburyi in cholangiocarcinoma cell lines. The study aimed to investigate the anticancer potency of four caged xanthones, which were found to inhibit growth of both cell lines in a dose-dependent manner. The researchers identified the compounds' ability to induce apoptosis in cholangiocarcinoma cells through a mitochondria-dependent signaling pathway.

Key Takeaways:

  • Four caged xanthones (isomorellin, isomorellinol, forbesione, and gambogic acid) were studied for their growth inhibitory mechanism in cholangiocarcinoma cell lines.
  • The compounds were found to inhibit growth of both cell lines in a dose-dependent manner and showed selective cytotoxicity against cancer cells.
  • Growth suppression was due to apoptosis, as evidenced by cell morphological changes, chromatin condensation, and DNA fragmentation.
  • The compounds induced down-regulation of Bcl-2 and survivin proteins with up-regulation of Bax and apoptosis-inducing factor proteins.
  • Isomorellinol exhibited the highest potency in increasing the Bax/Bcl-2 protein expression ratio and decreasing survivin protein expression.
  • The researchers concluded that four caged xanthones induce apoptosis in CCA cells through a mitochondria-dependent signaling pathway.

Statistics:

  • The compounds inhibited growth of both cell lines in a dose-dependent manner (sulforhodamine B assay).
  • The compounds showed selective cytotoxicity against cancer cells compared to normal peripheral blood mononuclear cells.
  • The Bax/Bcl-2 protein expression ratio was increased by 120 and 41.4 for KKU-100 and KKU-M156, respectively.
  • Survivin protein expression was decreased to 0.01 fold compared to control cells in both cell lines.

Sources:

  • Hahnvajanawong, C., et al. "Apoptotic activity of caged xanthones from Garcinia hanburyi in cholangiocarcinoma cell lines." World Journal of Gastroenterology, vol. 16, no. 18, 2010, pp. 2235-2243.
  • Clinical Oncology Week. "Apoptotic Activity of Caged Xanthones in Cholangiocarcinoma Cell Lines." Clinical Oncology Week, 2010.