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We have developed a miniviral vector, pH300, based on the human herpesviruses 1 and 4, herpes simplex virus type 1 (HSV-1), and Epstein-Barr virus (EBV), carrying EBV sequences for plasmid episomal maintenance and HSV-1 sequences for amplification and packaging in multimeric form into HSV-1 capsids in the presence of a helper virus and helper cell line. A reporter gene, the bacterial lacZ gene, which expressed beta-galactosidase, was inserted into the multiple cloning site of pH300 to make pH300-lac. The packaged pH300-lac DNA was very efficient in infecting human cells in tissue culture. The pH300-lac miniviral stock was used to infect in vitro various human cell types derived from breast cancer, lung cancer, and liver cancer. Up to 95% of cells were infected and expressed beta-galactosidase activity after exposure to viral stock at a multiplicity of infection of 3. There was essentially no apparent cytotoxicity after infection of cultured cells in vitro. To test in vivo gene delivery, human liver tumor cells preimplanted subcutaneously in nude mice and injected in situ with pH300-lac showed high efficiency of ectopic gene expression. The pH300 miniviral vector is a simple and effective gene transfer system which shows potential for gene therapy of cancer and inherited diseases.

journal of virology

A hybrid herpesvirus infectious vector based on Epstein-Barr virus and herpes simplex virus type 1 for gene transfer into human cells in vitro and in vivo