Phosphodiesterase type 5 siRNA increases cGMP in the smooth muscle cells of human corpus cavernosum

Objective:To investigate the effect of phosphodiesterase type 5(PDE5) small interfering RNA(siRNA) on the cGMP in the smooth muscle cells of human corpus cavernosum,and to provide an experimental groundwork for the gene therapy of erectile dysfunction(ED).Methods: Small interfering RNAs targeting PDE5 gene were synthesized by using web design software provided by Ambion,three siRNAs and a control siRNA were synthesized by Ambion.siRNAs were transfected into the smooth muscle cells of human corpus cavernosum by using siPORT~(TM) Lipid reagent.cGMP was detected by ELISA at different times(24,48,72 and 96 h) after transfection.Results: The cGMP levels of the siRNA1,siRNA2 and siRNA3 groups were significantly higher than those of the siRNA control and blank control groups(P(0.05)),and so was it in the siRNA1 group than the siRNA2 and siRNA3 groups (P(0.05)),with significant difference between the siRNA control and the blank control group(P(0.05)).Conclusion: The synthesized siRNAs in vitro are capable of increasing the level of cGMP in the smooth muscle cells of human corpus cavernosum,different siRNAs with different capabilities.The siRNA technique could provide not only an extremely powerful tool for the functional analysis of genome but also a new approach to ED gene therapy.