Inhibition of hepatitis B virus expression and replication by RNA interference in HepG2.2.15

AIM： To observe the inhibition of hepatitis B virus replication and expression by transfecting vector-based small interference RNA （siRNA） pGenesiI-HBV X targeting HBV X gene region into HepG2.2.15 cells. METHODS：pGenesil-HBV X was constructed and transfected into HepG2.2.15 cells via lipofection. HBV antigen secretion was determined 24, 48, and 72 h after transfection by time-resolved immunofluorometric assays （TRFIA）. HBV replication was examined by fluorescence quantitative PCR, and the expression of cytoplasmic viral proteins was determined by immunohistochemistry. RESULTS： The secretion of HBsAg and HBeAg into the supernatant was found to be inhibited by 28.5% and 32.2% （P 〈 0.01）, and by 38.67% （P 〈 0.05） and 42.86% （P 〈 0.01） at 48 h and 72 h after pGenesil-HBV X transfection, respectively. Immunohistochemical staining for cytoplasmic HBsAg showed a similar decline in HepG2.2.15 cells 48 h after transfection. The number of HBV genomes within culture supernatants was also significantly decreased 48 h and 72 h post-transfection as quantified by fluorescence PCR （P 〈 0.05）. CONCLUSION： In HepG2.2.15 cells, HBV replication and expression is inhibited by vector-based siRNA pGenesil- HBV X targeting the HBV X coding region.