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Hepatocyte-specific gene expression from integrated lentiviral vectors
Kathryn L Nash1, Bushra Jamil, Alison J Maguire
1Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2QQ, UK.
The Journal of Gene Medicine
|September 8, 2004
Summary
Hepatitis B virus (HBV) or alpha-1 antitrypsin gene promoters offer alternatives to cytomegalovirus (CMV) for liver-specific gene expression using lentiviral vectors. HBV enhancer 2 improves specificity and expression in hepatocytes.
Area of Science:
- Gene Therapy
- Molecular Biology
- Virology
Background:
- Efficient gene therapy demands long-term, organ-specific transgene expression.
- Lentiviral vectors derived from Human Immunodeficiency Virus type 1 (HIV-1) are effective for gene delivery, integrating transgenes into non-dividing cells.
- The cytomegalovirus (CMV) promoter, while potent in vitro, may exhibit rapid shutdown in vivo, necessitating alternative promoters for sustained therapeutic gene expression.
Purpose of the Study:
- To investigate the efficacy of HIV-1-based lentiviral vectors for transducing hepatocytes.
- To compare transgene expression levels driven by different promoters, including CMV, alpha-1 antitrypsin, and Hepatitis B Virus (HBV) promoters, in integrated lentiviral vectors.
- To assess the potential for liver-specific gene expression using these vectors.
Main Methods:
- Constructed HIV-1-based vector plasmids expressing green fluorescent protein (GFP) under the control of CMV, alpha-1 antitrypsin, or HBV promoters.
- Transfected and transduced various hepatocyte and non-hepatocyte cell lines with replication-deficient lentiviral vector particles.
- Evaluated GFP expression in transduced cells to compare promoter activity and liver specificity.
Main Results:
- Hepatocyte cell lines demonstrated variable transfectability, but lentiviral vector transduction was uniformly effective across hepatocyte and non-hepatocyte lines.
- In hepatocytes, GFP expression was observed with CMV, alpha-1 antitrypsin, and HBV core promoters, but not the HBV surface promoter alone.
- Incorporation of the HBV enhancer 2 element significantly enhanced HBV surface promoter activity and improved hepatocyte specificity by suppressing expression in non-hepatocytes.
Conclusions:
- Integrated lentiviral vectors can achieve both promiscuous and liver-specific transgene expression.
- Promoters from the alpha-1 antitrypsin gene and HBV genome serve as viable alternatives to the CMV promoter for transgene expression in liver cells.
- The HBV enhancer 2 element is crucial for achieving robust, liver-specific gene expression in vitro using lentiviral vectors.