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Efficient lentiviral gene transfer to canine repopulating cells using an overnight transduction protocol
Peter A Horn1, Kirsten A Keyser, Laura J Peterson
1Fred Hutchinson Cancer Research Center, Seattle, WA 98109-1024, USA.
Blood
|January 24, 2004
Summary
This study demonstrates efficient lentiviral vector transduction of canine hematopoietic stem cells using an overnight protocol, achieving high gene transfer rates up to 12% across all blood cell types.
Area of Science:
- Gene Therapy
- Hematology
- Molecular Biology
Background:
- Lentiviral vectors offer stable genome integration for hematopoietic stem cell transduction.
- Previous large animal studies reported low gene transfer rates (<1%).
Purpose of the Study:
- To evaluate efficient lentiviral transduction of canine CD34(+) hematopoietic repopulating cells.
- To compare transduction efficiency between primed marrow and mobilized peripheral blood cells.
- To assess multilineage engraftment and long-term gene marking.
Main Methods:
- Utilized lentiviral vectors for transduction of canine CD34(+) cells.
- Employed a short, 18-hour transduction protocol.
- Conducted a competitive repopulation assay in 3 dogs using primed marrow or mobilized peripheral blood.
Main Results:
- Rapid engraftment (within 9 days) was observed in all dogs.
- Transgene expression was detected in all hematopoietic lineages (B cells, T cells, granulocytes, red blood cells, platelets).
- Long-term marking levels reached up to 12%, with slightly higher levels in mobilized peripheral blood cells.
Conclusions:
- Demonstrated efficient lentiviral transduction of canine repopulating cells with an overnight protocol.
- These findings have significant implications for designing stem cell gene therapy protocols, particularly for diseases with stem cell culture limitations.