Abstract: Objective To design and screen small interfering RNA(siRNA) targeted protease-activated receptor-2(PAR-2) mRNA in Keratinocyte that can specifically and effectively suppress PAR-2 expression.Methods Three pairs of PAR-2 specific double stranded siRNAs were designed according to the sequence of PAR-2 mRNA.These siRNA were transfected into human keratinocyte by Lipofectamine 2000.The transcription level of PAR-2 was analyzed by semi-quantitative RT-PCR and PAR-2 protein expression was tested by western blot in order to evaluate the effect of RNA interference.Results Two of the three PAR-2 siRNA effectively inhibited the expression of PAR-2 and the second one is more effective.Conclusion PAR-2 siRNAs can be successfully designed and synthesized,which can specifically and effectively suppresses the expression of PAR-2 gene.The results in this study lay the foundation for further study on PAR-2 gene silencing by RNA interfere(RNAi).

Key words: Keratinocyte, Protease-activated receptor-2, RNA interfere