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Gene transfer into fetal rat intestine
1Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030-3498, USA.
Human Gene Therapy
|September 10, 1996
Summary
Gene therapy in fetal rat intestines shows promise. Simple flushing with a retroviral vector achieved the highest gene transfer efficiency, with transduced cells persisting for at least three weeks in a mouse xenograft model.
Area of Science:
- Gene therapy
- Xenograft models
- Molecular biology
Background:
- Fetal intestine is a potential site for gene therapy.
- Assessing gene transfer efficiency and persistence is crucial for therapeutic applications.
- Xenograft models provide a platform to study gene therapy in vivo.
Purpose of the Study:
- To evaluate the fetal rat intestine as a site for gene therapy.
- To compare different methods of retroviral vector transduction.
- To determine the persistence of transduced cells in a xenograft model.
Main Methods:
- A xenograft model using fetal rat intestine grafted into nu/nu mice.
- Transduction with a replication-deficient retroviral vector carrying the neo gene.
- Quantitative polymerase chain reaction (PCR) to assess neo gene presence.
- Three infection methods: simple flushing, 2-hr incubation, and combined approach.
Main Results:
- Simple flushing of the fetal intestine yielded the highest transduction efficiency.
- Higher proportion of neo-positive samples and neo-positive cells per sample were observed with flushing.
- Transduced cells showed a five-fold decrease from 1 to 3 weeks post-infection, indicating cell turnover.
- A portion of transduced cells persisted for at least 3 weeks.
Conclusions:
- The fetal rat intestine is a viable site for gene therapy.
- Simple flushing is an effective method for retroviral vector delivery.
- While cell turnover occurs, sustained gene expression is achievable for therapeutic potential.