Abstract
For many applications, efficient gene therapy will require long-term, organ-specific therapeutic gene expression. Lentiviral vectors based on HIV-1 are promising gene delivery vehicles due to their ability to integrate transgenes into non-dividing cells. Many experimental vectors express transgenes under the control of the cytomegalovirus (CMV) immediate-early gene promoter. Although this promoter directs strong gene expression in vitro, it may be shut off rapidly in vivo. This study explores the potential of HIV-1-based vectors to transduce hepatocytes and compares gene expression from different promoters in integrated vectors. HIV-1-based vector plasmids expressing the green fluorescent protein (GFP) under the control of the CMV promoter, the alpha-1 antitrypsin gene promoter or promoters derived from the hepatitis B virus (HBV) genome were used to compare expression in transfected and transduced cell lines. Hepatocyte cell lines differed strikingly in their transfectability. Transduction with replication-deficient HIV-1-based vector particles incorporating the different promoter elements was uniformly effective in hepatocyte and non-hepatocyte lines. However, in hepatocytes, only the CMV, alpha-1 antitrypsin and HBV core but...Continue Reading
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