Objective:To construct a nasopharyngeal carcinoma cell strain expressing GFP stably and observe the inhibition effect and cytotoxicity of short hairpin RNA targeting the intrinsic GFP.Methods:HNE1 cells transfected with pEGFP-N1 were followed by the screening with G418 to obtain the stable nasopharyngeal carcinoma cell strain expressing GFP(HNE1-GFP);shGFP

a vector expressing short hairpin RNA targeting GFP

was transfected into HNE1-GFP with various levels.The fluorescence was observed by fluorescent microscope.The inhibition ratios and cytotoxicity of shRNA were analyzed by software and MTT

respectively;The protein and mRNA level of GFP were detected by Western Blot and RT-PCR

respectively.Results:The GFP gene was expressed stably within HNE1-GFP cell line;shGFP suppressed the intrinsic expression of GFP with the ratios of 49.7%

84.8% and 86.7%

respectively

without significant cytotoxicity.Conclusion:A nasopharyngeal carcinoma cell strain expressing GFP stably is established successfully;The inhibition effect of RNA interference is demonstrated in nasopharyngeal carcinoma cells and it is characterized by the significant concentration dependence and rare cytotoxicity.