Radiosensitization of C225 on human non-small cell lung cancer cell Hne H-520 / 中华放射肿瘤学杂志

ABSTRACT

Objective To investigate the efficacy of C225(cetuximab),a chimeric human-mouse anti-epithelial growth factor receptor monoclonal antibody.combined with 60Co gamma irradiation against humall non-small cell lung cancer cell line H-520. Methods H-520 cells were treated either with different dose of 60Co irradiation(1,2,4,6,8 and 10 Gy)alone or together with C225(100 nmol/L).Colony forming capacity was determined to create the survival curve 10 days after the treatment.Cells in different groups were harvested 72 hours after irradiation for apoptosis analysis or 48 hours after irradiation for cell cycle analysis by flow cytometry assay. Results The clone number in combinational treatment group was less than that in irradiation only group,which suggested that the cell survival rate in the combinational treatment group was significantly decreased comparing with irradiation only group(F=6.36,P＜0.05).The sensitizing enhance rate(SER)was 1.35.The percentage of apoptotic H-520 cells was 5.56%±0.62%,13.86%±0.80%,25.36%±1.02%and 29.89%±2.09%,respectively in 0,2,4 and 8 Gy irradiation alone groups,which were significantly lower than 13.75%±0.83%.25.12%±1.60%.46.12%±2.60%and 50.5l%±4.06%.respectively in irradiation combined with C225 treatment groups(F=4.72,P＜0.05).The cellcycle analysis showed that cells arrested in G0+G1 phases for C225 treatment,in G2+M phases for 60Co irradiation,and in both G0+G1 and G2+M phases for C225 in combination with 60Co irradiation. Conclusions C225 has radiosensitizing effects on H-520 cells.which may through the enhancement of 60Co irradiation-induced cell death and cell cycle arrest.This study provides a supportive evidence for clinical treatment in non-small cell lung cancer.