Abstract
A gene transfer vector for DNA immunization was developed in which the promoter was derived from the murine muscle creatine kinase (MCK) gene; a gene expressed only in differentiated skeletal muscle. In vitro, we observed high-level, but unrestricted, gene expression from the cytomegalovirus (CMV) promoter unlike expression from the MCK promoter which was weak but restricted to myofibers. A myogenic DNA vaccine (MDV) that encoded the glycoprotein D gene from herpes simplex virus type-2 (HSV-2) was used to DNA immunize mice. MDV immunization resulted in virus specific immunity that protected HSV-2 infected mice from mortality and prevented the development of genital herpes. Therefore, we conclude that high-level gene expression or the use of a strong transcription unit was not a prerequisite for an efficacious DNA vaccine and the use of a nonviral tissue specific promoter could suffice.
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