RESUMEN
BACKGROUND: To investigate the effect of (103)Pd radioactive stent on Caspase-9, cholangiocarcinoma cell growth and its radiosensitivity. METHODS: Cholangiocarcinoma was treated with (103)Pd radioactive stent at different period. Radiosensitivity of the cells was detected by methyl thiazolyl tetrazolium (MTT) method. Apoptosis of cholangiocarcinoma cells was detected by immunohistochemistry and electron microscope. The activity of Caspase-9 was detected by non-radioimmunoprecipitation, while its protein expression was detected by Western blot. RESULTS: (103)Pd radioactive stent had significant inhibitive effect on cholangiocarcinoma cells and it could induce apoptosis. After treatment by (103)Pd radioactive stent for 10 days, the activity of Caspase-9 was gradually enhanced, which was markedly decreased in common stent group. Cholangiocarcinoma cells had relatively high sensitivity to (103)Pd radiation. CONCLUSION: (103)Pd radioactive stent can activate caspase-9 gene to induce apoptosis of cholangiocarcinoma cell, inhibit its growth and enhance its radiosensitivity.