Construction and Identification of SiRNA Retrovirus Expression Vector Targeting NF-κB P65 Subunit of Mouse

Objective To construct the mouse NF-κB P65 subunit expression plasmid,and identify its biological activity.Methods NFκB P65 siRNA retrovirus expression vectors were reconstructed by molecular clone technology.Recombinant vectors were transfected into 293E package cells and virus suspension was collected.RT-PCR was used to detect the expression level of NF-κB P65 mRNA and TNF-α mRNA at different time-point of LPS stimulation.Western blot was performed to analyze the protein level of NF-κB P65.ELISA was applied to detect the expression level of TNF-α released by LPS-stimulated J774A.1.Results NF-κB P65 siRNA retrovirus expression vectors of mouse were successfully constructed.From 2 hours after the stimulation of LPS,the expression level of NF-κB P65 mRNA of the siRNA group was obviously lower than the scramble control group(0.91±0.03 vs.1.02±0.02,P0.01).At 24,36,48 and 72 hours after the LPS stimulation,the expression level of NF-κB P65 protein of the siRNA group was significantly decreased compared with the scramble control group(0.97±0.02 vs.1.01±0.01,0.94±0.01 vs.1.02±0.01,0.94±0.02 vs.1.02±0.01,0.93±0.01 vs.1.00±0.02,P0.05).At 2,6,12,24 hours after the LPS stimulation,both the expression level of TNF-α mRNA and the content of TNF-α in the culture medium supernatant of the siRNA group were lower than the scramble control group(P0.01).Conclusions The construction of NF-κB P65 siRNA retrovirus expression vectors is feasible.Inflammation factors in mouse monocyte-macrophages are significantly inhibited after NF-κB expression is depressed by RNA interference technology,which may be applied to prevent and treat excessive inflammatory reaction in acute lung injury.