Dynamics of transgene expression in a neural stem cell line transduced with lentiviral vectors incorporating the cHS4 insulator.
Author
Summary, in English
Transplantation of genetically manipulated cells to the central nervous system holds great promise for the treatment of several severe neurological disorders. The success of this strategy relies on sufficient levels of transgene expression after transplantation. This has been difficult to achieve, however, due to transgene silencing. In this study, we transduced the neural stem cell line RN33B with self-inactivating lentiviral vectors and analyzed transgenic expression of green fluorescent protein (GFP) in several different settings both in vitro and after transplantation to the brain. We found that the transgene was affected of silencing both when transduced cells were proliferating and after differentiation. To prevent silencing, the cHS4 insulator was incorporated into the lentiviral vector. We found that a vector carrying the cHS4 insulator was partially protected against differentiation-dependent downregulation in vitro and in vivo. However, in proliferating cells, we found evidence for variegation and positional effects that were not prevented by the cHS4 insulator, suggesting that the mechanism behind silencing in proliferating cells is not the same mechanism influencing differentiation-dependent silencing. Taken together, these findings favor vector optimization as a strategy for achieving efficient ex vivo gene transfer in the central nervous system.
Publishing year
2004
Language
English
Pages
611-623
Publication/Series
Experimental Cell Research
Volume
298
Issue
2
Links
Document type
Journal article
Publisher
Academic Press
Topic
- Neurosciences
Keywords
- Gene therapy
- Insulator
- cHS4
- Ex vivo
- Silencing
- Green fluorescent protein
- Transplantation
Status
Published
Research group
- Neurobiology
- CNS Gene Therapy
ISBN/ISSN/Other
- ISSN: 1090-2422