[Influence of epidermal growth factor receptor monoclony antibody MAb225 on DNA repair of tongue carcinoma cell after radiation].

Objective: The objective of this study is to investigate the effect of epidermal growth factor receptor (EGFR) monoclonal antibody MAb225 on repair of DNA double strand break (DNA-DSB) after radiation in tongue squamous cell carcinoma cell.

Methods: The single cell gel electrophoresis (SCGE) was performed to estimate the repair of DNA-DSB induced by radiation in human tongue carcinoma cells Tca8113 treated with or without MAb225. Expression of Ku70 and Ku80 were detected by semiquantitative reverse transcription polymerase chain reaction and Western bolt.

Results: Comet tail moment of MAb225 treated cell was significantly higher than untreated cell (P < 0.05). The expression of Ku70 and Ku80 were inhibited by MAb225.

Conclusion: MAb225 can inhibit repair of DNA-DSB induced by down-regulated expression of Ku70 and Ku80.