Study of Anti-proliferation and Apoptosis after Combined Treatment of IFN-? with Doxorubicin in Caspase-8 Sile-nced Neuroblastoma Cell Line / 国际儿科学杂志

ABSTRACT

Objective To explore the influence of IFN-? on anti-proliferation and apoptosis of the Caspase-8 silenced neuroblastoma cell line induced by doxorubicin and the influence mechanism.Methods MTT and flow cytometric analysis were used to detect the survival and apoptosis rates before and after the combined treatment of IFN-? and doxorubicin.Immunohistochemical staining was used to detect the expression of caspase-8 protein before and after the treatment of IFN-?.Results The survival rates of doxorubicin(0.03,0.10,0.30?g/ml)used alone for 24h were(95.62?13.03)%,(82.62?7.94)%,(64.84?9.19)%,IFN-?(10,100,1000U/ml)used alone for 48h were(98.37%?11.25)%,(97.15?5.36)%,(98.84?7.41)%.The survival rates of IFN-?(1000U/ml)combined with different concentration of doxorubicin(0.03,0.10,0.30?g/ml)were significantly lower than that of doxorubicin(0.03,0.10,0.30?g/ml)alone.The apoptosis rate of doxorubicin(0.30?g/ml)alone was(22.00?6.55)%,IFN-?(1000U/ml)alone was (8.22?4.00)%,whereas the apoptosis rate of the combined treatment of IFN-? and doxorubicin wassignificantly higher than that of doxorubicin alone;Immunohistochemical staining showed that caspase-8 protein was negative in SH-SY5Y cell line,whereas it become positiveafter the treatment of IFN-?(1000U/ml)for 48h.Conclusion Treating human neuroblastoma cell line SH-SY5Y cell with doxorubicin may induce anti-proliferation and apoptosis.Combined treatment with IFN-? may significantly increase this effect.The mechanism may be realized by upregulating the expression of caspase-8 protein.