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A novel 'piggyback' packaging system for herpes simplex virus amplicon vectors
P A Pechan1, M Fotaki, R L Thompson
1Department of Neurology, Massachusetts General Hospital East, Boston, USA.
Human Gene Therapy
|October 20, 1996
Summary
A novel "piggyback" system enhances herpes simplex virus (HSV-1) amplicon vector propagation, enabling efficient gene delivery to tumor cells without apparent brain pathology. This method supports vector enrichment and conditional propagation for future applications.
Area of Science:
- Virology
- Molecular Biology
- Gene Therapy
Background:
- Herpes simplex virus type 1 (HSV-1) vectors are effective for gene delivery.
- Current methods face challenges in vector propagation and stability.
Purpose of the Study:
- To develop a mutually dependent system for propagating HSV-1 amplicon vectors and helper viruses.
- To enhance amplicon vector maintenance and enrichment during stock propagation.
Main Methods:
- A
- piggyback
- system was engineered where amplicon and helper virus propagation are interdependent.
- Amplicons carried essential HSV-1 replication gene (IE3) and lacZ marker.
- A mutant HSV-1 (d120) lacking IE3 was used for propagation.
Main Results:
- High titers of amplicon vectors (6 x 10(7) IU/ml) were achieved with delayed cytopathic effects.
- Successful gene delivery to experimental gliomas in rodents via both amplicon (lacZ) and helper virus (HSV-TK).
- No observed neuropathology in normal brain tissue following injection.
Conclusions:
- The piggyback system efficiently propagates HSV-1 amplicon vectors.
- This model facilitates gene delivery to tumors in vivo.
- The system is adaptable for conditional in vivo vector propagation and multiple transgene incorporation.